JP3513957B2 - Digital video signal recording device and reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is especially applicable to PALplus.
The present invention relates to a digital video signal recording device for recording a composite color video signal according to S.

[0002]

2. Description of the Related Art In recent years, a broadcasting system called PALplus has been proposed which is intended to achieve high image quality and wide screen while maintaining compatibility with PAL system television signals.
That is, in the current PAL system, the aspect ratio is 4 :.
It is said to be 3. On the other hand, the wide screen has an aspect ratio of, for example, 16: 9, which is a horizontally long screen compared to the current screen. The PALplus system is capable of achieving high image quality when a 16: 9 wide screen is displayed on a television receiver, and is also capable of displaying a current 4: 3 television.

The PALplus system is based on a letterbox type screen. As shown in FIG. 19, the letterbox type is such that the screen is projected in the center and the upper and lower parts of the screen are non-screen. For example,
In the PAL system, a video signal is placed on 430 lines at the center of the screen, and the upper and lower 72 lines are not screened. As a result, a 16: 9 horizontally long screen is formed. Less than,
A portion where the central screen is displayed is called a main image portion, and upper and lower non-screen portions are called non-image portions.

In the PALplus system, a helper signal for reinforcing vertical resolution is multiplexed on the upper and lower non-picture areas. The helper signal and the letterbox signal are shown in FIG. On the other hand, in addition to this helper signal, a signal indicating how the signal is recorded in the main picture area or the upper and lower non-picture areas of the letterbox screen is on a line separate from the helper signal and letterbox signal. It is recorded. This state is shown in FIG.

Of these signals, the line 23 has a WSS (Wide Screen Signal) indicating the aspect ratio and the presence / absence of a helper signal, as shown in FIG.
ing) signal and a helper signal are further provided, the subcarrier frequency (4.
A reference burst signal of 43 MHz) is provided.

Further, as shown in FIG. 23, a reference signal showing a level of 100% white is sent to the line 623. Radio waves transmitted from a broadcasting station are attenuated by various interferences before reaching a television receiver. This radio wave received by the television receiver is gain-controlled by the AGC so that the level from the pedestal level to the sync tip level becomes a prescribed voltage based on the white 100% reference signal. In addition, the amplitude of the reference burst signal having the subcarrier frequency described above is restored by the 100% white reference signal.

[0007] The applicant of the present invention has made such a PALplus
Digital VTR of compression recording system in preparation for system broadcasting
Then, a device which enables recording of a PALplus system signal is proposed.

That is, a compression recording type digital VTR
When recording a PALplus video signal, the helper signals sent to the upper and lower non-screen portions of the screen are demodulated, treated as chroma signals and recorded. PALpl
The WSS signal on the line 23 is extracted from the us signal,
The data of this WSS signal is stored as VAUX data (video preliminary data). The video signal sent to the main image section is compressed and recorded in a predetermined method.

[0009]

In the PAL system (625-50 system), as shown in FIG. 24, lines 23 to 310 in field 1 and lines 335 to 622 in field 2 are defined as effective lines. ing. When the effective line is thus defined, the 0.5H image signal on the line 623 is lost when the PAL system signal is recorded by the digital VTR of the compression system as described above. However, this lost image signal is hidden at the top and bottom of the screen in the current television system with an aspect ratio of 4: 3, so there is no practical problem.

Here, the line 23 is W as described above.
Although the SS signal and the reference burst signal are inserted, they are included in the effective line, that is, the image information compression area. This causes the following problems.

First, the signal on the line 23 of PALplus contains a signal related to subcarriers.
These signals are treated as chroma signal components and recorded in the digital VTR. The compression type digital VTR is recorded at 4: 1: 1 or 4: 2: 0, and the amount of information assigned to the chroma signal is small. If these signals are recorded as the chroma signal, the original chroma signal is recorded. As a result, the color reproducibility is significantly deteriorated.

NRZ signals are included in these lines. Since the NRZ signal contains a wide range of frequency components from DC to a very high frequency band, the compression effect by DCT is small. For this reason, a coarse quantization table is used in the quantization, and the image quality deteriorates.

In order to solve these problems, the present applicant has proposed a method of recording this line 23, that is, an effective line containing these WSS signals and the like at a pedestal level, for example. .

Further, in the PALplus signal, a helper signal is inserted in the non-picture part. In DCT, a matrix of several blocks, for example, 8
A block of pixels such as × 8 is treated as a basic unit. Therefore, when handling data in the vicinity of the boundary between the main image part and the non-image part of PALplus, a part of one unit block is a black-level image signal in which a helper signal is multiplexed, and the other part is a normal image. Become a signal.

When such an image is compressed by DCT and the compressed image is restored, depending on the image, D
There is a possibility that the energy distribution after CT processing will differ greatly from the original image. That is, depending on the image, the helper signal may be adversely affected, and in this case, an image defect such as a horizontal line occurs near the center of the screen during reproduction.

In order to solve this problem, as shown in FIG. 25, a method of recording by replacing the real image in the block at the boundary between the main image portion and the non-image portion with the pedestal level can be considered. However, in this case, the actual image number lines above and below the main image portion are lost.

On the other hand, the helper signal multiplexed in the non-picture part is modulated by the 4.43 MHz subcarrier.
As described above, the reference of this subcarrier signal is inserted in the latter half of the line 23 as shown in FIG. In order to demodulate the helper signal using this reference, not only the phase information of this reference but also the amplitude is important. In order to restore this amplitude to the level at the time of transmission from the broadcasting station, the reference signal of 100% white level inserted in the line 623 is used.

That is, the received PALplus signal is gain-controlled by the AGC inside the tuner, and then input to the PALplus image signal decoder. In this decoder, line 6 of the input signal
The gain is controlled so that the white level of 23 is 100% of the specified voltage level. By doing this,
The amplitude of the reference of the subcarrier signal inserted in the line 23 can be returned to the level at the time of transmission from the broadcasting station, and the original high image quality of the PALplus system can be reproduced.

By the way, in the digital VTR, only the effective screen is extracted and compression-coded, and the data in the vertical blanking period and the horizontal blanking period are dropped. Therefore, the other 100% white reference signal inserted in the line 623 is cut off because it exists in the vertical blanking period which is a non-image portion.

As mentioned above, this 100% white reference signal determines the overall level of the received television signal. At this time, if the signal is received in an area where the electric field strength is sufficiently strong, it is possible to restore the signal at a prescribed level even if the reference signal is lost. However, in such an ideal situation, it is not possible to expect the reference voltage of the restored luminance signal to reach the specified white level of 100%, particularly in the weak electric field region.

Also in this case, when receiving the broadcasting by the existing PAL system, there is no particular problem. However, there is a problem that an intended signal cannot be restored in a signal with high image quality such as an image signal by the PALplus system.

Therefore, the object of the present invention is to provide PALp
An object of the present invention is to provide a digital video signal recording / reproducing apparatus that does not cause deterioration of image quality when a lus signal is recorded.

[0023]

In order to solve the above-mentioned problems, the present invention is transmitted in a letterbox format,
In a digital video signal recording apparatus for compressing and recording a composite color video signal in which a signal for enhancing resolution is multiplexed in a non-screen portion on a recording medium, an effective portion of an input video signal is extracted . Extraction means and input
Riff of the luminance signal sent to a predetermined line of the video signal
Sampling means for sampling the reference signal,
Compress the effective portion of the video signal extracted by the extraction means
Compression means and the effective portion compressed by the compression means
Video signal, sampled by sampling means
Preliminary data in which data is stored in a prescribed area
A digital video signal recording apparatus having a recording means for recording on a body .

In order to solve the above-mentioned problems, the present invention provides a composite color video signal which is transmitted in a letterbox format and in which a signal for reinforcing the resolution is multiplexed in a non-screen portion is a PALplus signal. The predetermined line to which the reference signal of the luminance signal is sent is line 623, which is a digital video signal recording device.

Further, in order to solve the above-mentioned problems, the present invention is characterized in that, when the reference signal of the luminance signal cannot be obtained, the data in the predetermined area of the preliminary data is (FFh). It is a signal recording device.

Further, according to the present invention, in order to solve the above-mentioned problems, a composite color video signal transmitted in a letterbox format and having a resolution-enhancing signal multiplexed in a non-screen portion is recorded in a compressed form. In a digital video signal reproducing device for reproducing a recording medium ,
The effective part is compressed and recorded, and the video signal
Luminance signal reference signal sent to a predetermined line
The sampled data was saved in a predetermined area
Reproducing means for reproducing a recording medium on which spare data is recorded
And a compressed video of the effective part played by the playback means
And extension means for extending the signal, re obtain a reference data of the preliminary data or RaTeru degree signal reproduced by the reproducing means
Reference data acquisition method and reference data acquisition
And having a adding means for adding reference data for the obtained luminance signal means to a predetermined line of decompressed video signal by the decompression means a reference signal into an analog signal reconstructed luminance signal It is a digital video signal reproducing device.

Further, in order to solve the above-mentioned problem, according to the present invention, when the data of the reference signal of the luminance signal reproduced from the preliminary data is (FFh), the reference signal of the luminance signal is 100% white during reproduction. The digital video signal reproducing device is characterized in that the level is set to and is inserted into a predetermined line.

In order to solve the above-mentioned problems, the present invention is also a digital video signal reproducing apparatus in which a predetermined line in which a reference signal of a luminance signal whose level is 100% white is inserted is a line 623.

[0029]

Since the present invention has the above-mentioned configuration,
It is possible to record and reproduce the reference signal of the luminance signal of the PALplus signal.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of the embodiments, the format of a tape for recording the PALplus signal will be described for ease of understanding.

In the video track, as shown in FIG.
Tracks are formed. At the beginning of each track, ITI
An area is provided, followed by an audio area, a video area, and a subcode area.
The ITI area is a timing block for surely performing post-recording, and is used for accurately performing positioning when post-recording and rewriting data written in subsequent areas. Audio data is recorded in the audio area. Compressed video data is recorded in the video area. The sub code area is used for high speed search. When recording NTSC format data,
One video frame is recorded with 10 tracks.

10 and 11 show the structure of data in the audio area. As shown in FIG.
One sync block is composed of 90 bytes. The first 5 bytes of the data part are presync and postsync, and the data part is 77 bytes (72 bytes of audio data and 5 bytes of AAUX). The data part is protected by a horizontal parity C1 (8 bytes) and a vertical parity C2 (5 sync blocks). As shown in FIG. 11, 14 sync blocks are arranged per track. The first 5 bytes of the data section are for AAUX.
One pack consists of these 5 bytes.

12 and 13 show the structure of data in the video area. One sync block in the video area is composed of 90 bytes. The first 5 bytes of the data part are presync and postsync, and the data part is 77 bytes. As shown in FIGS. 12 and 13, a horizontal parity C1 (8 bytes) and a vertical parity C2
It is protected by (11 sync blocks).

FIG. 13 shows a vertical arrangement of 149 sync blocks of the video sector. As shown in FIG.
The upper two sync blocks and the two sync blocks immediately before the C2 parity are reserved for VAUX. VA
Video data is stored except for UX and C2 parity. In FIG. 13, 135 sync blocks in the center are the storage areas of video signals. In the figure, BUF0 to BUF26 indicate buffering units, respectively. One buffering unit is composed of 5 sync blocks, and one track includes 27 buffering units. There are 270 buffering units for 1 video frame and 10 tracks. In other words, an area effective as an image is extracted from the image data of one frame, and that area is sampled and collected 27
Zero groups are formed. One group is one buffering unit.

For each buffering unit, data compression is tried by DCT conversion, quantization, variable length coding, etc.
It is evaluated whether the generated code amount is equal to or less than the target data. Then, a quantization step is determined so that the amount of generated data is less than or equal to the target, and actual encoding is performed using this quantization step. Then, the generated encoded data is packed in one buffering unit and five sync blocks.

FIG. 14 shows the data structure of the sub code area. As shown in FIG. 14A, the sub code area is composed of 12 sync blocks. One sync block is 12 bytes, which is shorter than one sync block in the video area or audio area. This is to enable high speed search. At the beginning of one sync block, a 1-byte presync and postsync are provided. Following this, 3 bytes of ID data consisting of ID0 and ID1 and IDP which is a parity for ID0 and ID1 are added. Next, a 5-byte main data area is provided, and 2-byte parity is further added. The main data area stores the time code, recording date, etc. necessary for high-speed search.

As shown in FIGS. 14C and 14D, the ID
0 means F / for detecting an address during high-speed search.
An R flag is provided. Subsequently to this, as shown in FIG. 14C, in sync block numbers SB0 and SB6, an application ID (AP
I3) is arranged, and the absolute track number is arranged so as to straddle the next ID1. For other sync block numbers, as shown in FIG. 14D, an F / R flag is provided, which is followed by an index ID, a skip ID,
A photo picture ID is provided, so that it straddles ID1.
An absolute track number is provided. The ID1 is provided with an absolute track number and a sync number.

Preliminary data AAUX in the audio area,
Preliminary data VAUX in the video area, subcode data, and data (not shown) in the cassette with memory are shown in FIG.
It is described by a common pack structure as shown in. The pack is basically composed of 5 bytes (PC0 to PC4), the first 1 byte is a header, and the remaining 4 bytes are data.

The header is divided into upper 4 bits and lower 4 bits to form two layers, and can further be extended to a layer below it by bit assignment of data. Due to this layering, the contents of the pack are clearly organized and the expansion is ready. Then, 256 spaces are prepared by the upper header and the lower header as a pack header table together with the contents of the pack. Each area is described using this. The pack structure is basically 5 bytes, but as an exception, when writing a character in the cassette with memory, it has a variable length.

FIG. 16 shows a VAUX storing an identification signal.
2 shows the structure of the TR pack of FIG. TR pack is
The header byte PC0 is set to "66h". The data type (DATA TYPE) is 4 bits and distinguishes various signals. This data type (DATA TYPE)
Is defined as follows.

0000 = VBID 0001 = WSS 0010 = EDTV-2 in 22 lines 0011 = EDTV-2 in 285 lines 0100 = No Information Other = undefined

FIG. 17 shows V where color phase information is stored.
1 shows the structure of an AUX source pack. In the source pack, the header byte PC0 is "60h".
A color frame identification code (CLF) is stored in the PC 1. This color frame identification code (CLF)
Is defined in the 625/50 system as:

00 = first and second fields 01 = third and fourth fields 10 is the fifth and sixth fields 11 = 7th and 8th fields

FIG. 18 shows the structure of a VAUX source control pack in which aspect ratio information is stored. The source control pack has a header byte P
C0 is set to "61h". The PC2 is provided with a display select mode (DISP). The display select mode (DISP) defines the aspect ratio as follows.

000 = 4: 3 normal 001 = 4: 3 letterbox 010 = 16: 9

An embodiment of the present invention will be described below with reference to the drawings. In this invention, 100% white
It is possible to restore the helper signal by extracting the reference signal at the level of and then writing the data in the TR pack in the tape format of the digital VTR described above.

FIG. 1 shows an example of the overall configuration when recording a PALplus signal on the above-mentioned tape format. The PALplus signal received from antenna 1 is
It is supplied to the PALplus signal recording circuit 3 via the tuner 2.

The PALplus signal recording circuit 3 is arranged so that it can be recorded by the digital VTR 4.
It processes the us signal. This signal supplied to the PALplus signal recording circuit 3 is output by the circuit.
/ C separation, helper signal demodulation, WSS signal decoding, and extraction of a 100% white reference signal.

The PALplus signal recording circuit 3 multiplexes the demodulated helper signal into the chroma signal C and supplies the video signal to the digital VTR 4 as a luminance signal Y and color difference signals C _R and C _B. To be done. In addition, the WSS signal and the white 100% reference signal are output as TR pack data, and the digital V
It is supplied to TR4. Further, the PALplus signal recording circuit 3 also outputs a switching signal indicating the switching state of the line, which is also a digital VTR 4
Is supplied to.

FIG. 2 is a diagram showing the overall configuration when reproducing the recorded PALplus signal. Digital V
From TR4, a reproduction luminance signal Y and reproduction color difference signals C _R and C _B are output as video signals, respectively, PALplus
It is supplied to the signal reproducing circuit 5. Also, a digital VTR
TR pack data is also output from 4, and PALplus is output.
It is supplied to the s signal reproduction circuit 5.

The reproduced color difference signals C _B and C _R supplied to the PALplus signal reproducing circuit 5 are separated and chroma-modulated from the inserted helper signals, and Y / C combined with the supplied Y signal. . In addition, PALplus
The TR pack data supplied to the s signal reproducing circuit 5 is W
The SS signal and the reference signal of 100% white are taken out and inserted into the predetermined lines of the Y / C combined signal described above. This combined signal is PALpl
It is supplied as a us signal to the television receiver 6 and displayed.

FIG. 3 shows an example of the configuration of the PALplus signal recording circuit 3 described above. The PALplus signal is supplied from the input terminal 10. The PALplus signal supplied to the PALplus signal recording circuit 3 is also supplied to the Y / C separation circuit 12, the WSS decoder 13, the synchronization separation circuit 14, and the helper signal demodulation circuit 11.

PALpl supplied to the sync separation circuit 14
As for the us signal, the horizontal synchronizing signal and the vertical synchronizing signal are detected, and these signals are extracted. These extracted signals are supplied to the line decoder switch circuit 17. With this line decoder switch circuit 17, WS
Timing for controlling each of the S decoder 13, the helper signal demodulation circuit 11, and the latch circuit 18 is created. Also, this line decoder switch circuit 1
The output of 7 is supplied to the output terminal 26 as switching information.

PALp supplied to the Y / C separation circuit 12
The lus signal is Y / C separated. The separated luminance signal Y is supplied to the output terminal 22 as it is as the luminance signal Y and is also supplied to the A / D converter 15. A /
The luminance signal Y supplied to the D converter 15 is sampled by 8 bits and supplied to the latch circuit 18. As described above, the latch circuit 18 is controlled by the output of the line decoder switch circuit 17, and the supplied signal is latched and held at the timing of the white 100% reference period on the line 623. This latched data is data showing a value of 100% white, and is the PC of the TR pack data shown in FIG.
4 data. The output of the latch circuit 18 is controlled by the line decode switch circuit 17 and supplied to the adder 20 at a predetermined timing.

On the other hand, the chroma signal C separated by the Y / C separation circuit is supplied to the adder 19.

The helper signal demodulation circuit 11 is controlled by the line decoder switch circuit 17 as described above. The helper signal is extracted by the control of the line decoder switch circuit 17, and this helper signal is demodulated by the helper signal demodulation circuit 11. This demodulated helper signal is supplied to the adder 19.

As described above, the adder 19 uses the Y / C
The separated chroma signal C is also supplied. The demodulated helper signal is multiplexed on the chroma signal C. The multiplexed signal is supplied to the chroma demodulation circuit 21 and demodulated as color difference signals C _R and C _B.

As a result, in the latter half of the line 23, as shown in FIG.
As indicated by C _R in A, a maximum of 54 (0.3 V) DC component is added to the C _R signal. This is because this C signal is -U
This is because it is modulated by the axis. Therefore, the value of C _B remains 128. Further, as shown in FIG. 4B, the demodulated helper signal with the maximum amplitude 108 is placed on the non-image portion. In the video portion, as shown in FIG. 4C, a maximum of 235 DC levels are added to the luminance signal Y, and 16
Levels from 240 to 240 are added to the chroma signal C.
In the line 623, the level of 235 or the level of 100% white is added to the luminance signal Y, as shown in FIG. 4D.

The WSS decoder 13, as described above,
It is controlled by the line decoder switch circuit 17. The PALplus signal 111 supplied to the WSS decoder 13 is extracted by the control of the line decoder switch circuit 17 in the WSS bit period shown in FIG. This extracted WSS signal is W
It is supplied to the SS rewriting circuit 16. The WSS rewriting circuit 16 creates and holds the data of the TR pack data PC1 to PC3 shown in FIG. 16 from the extracted WSS signal. The output of the WSS rewriting circuit 16 is supplied to the adder 20 at a predetermined timing under the control of the line decoder switch circuit 17.

As described above, the outputs from the latch circuit 18 and the WSS rewriting circuit 16 are both supplied to the adder 20. These signals are combined at a predetermined timing, the output from the latch circuit 18 is used as PC4 of the TR pack data in the above-mentioned tape format, and the output of the WSS rewriting circuit 16 is also used as PC.
1 to PC3 are output.

FIG. 5 shows a digital VT for recording the signal output from the PALplus signal recording circuit described above.
An example of the configuration of R4 is shown. In FIG. 5, the input terminal 3
Component color video signals Y, C _B , and C _R are supplied to 0, 31, and 32. Of these component color video signals, C _B and C _R are supplied to a line-sequential thinning circuit and are line-sequentialized to be C _B / C _R signals. This is because the digital recording method of the PAL signal is set to a rate of 4: 2: 0 in which two color signals are line-sequentially. This C _B / C _R signal is supplied to the A / D converter 34.

On the other hand, the luminance signal Y of the component color video signal is supplied to the A / D converter 34 together with the above C _B / C _R signal. The A / D converter 34 outputs the component signals Y and C _B / C _R at a frequency of 13.5M.
It is digitized with a sampling clock of Hz. In the case of the PAL system, the information amount 4 of the luminance signal Y
On the other hand, the information amount of the line-sequential color difference signals C _B / C _R is set to 2 and digitized at a so-called 4: 2: 0.

The switching information input terminal 61 is supplied with switching information from the switching information output terminal 26 of the PALplus signal recording circuit 3. This switching information is supplied to the masking signal generation circuit 35. The masking signal generation circuit 35 uses the supplied switching information to input the input terminals 30, 31,
It is known that the line of the component color video signal input to 32 is the line to be the pedestal level. The line that should be at this pedestal level is
For example, a plurality of lines as shown in FIG. 24, or W
For example, the line 23 including the SS signal is applicable. At this time, the masking signal generation circuit 35 forcibly controls the output of the A / D converter 34 so as to reach the pedestal level. For example, as shown in FIG. 4A, the value of Y is 16, and the values of C _B and C _R are 128.

The output of the A / D converter 34 is supplied to the effective information extraction circuit 36. The valid information extraction circuit 36 drops data outside the valid screen, such as the vertical blanking period and the horizontal blanking period, and extracts only the data within the valid screen. Here, the valid lines are 23 to 310 lines in field 1 and 33 lines in field 2.
There are 5 to 622 lines. PALplus
Then, the WSS signal indicating the aspect ratio data and the identification signal such as the presence / absence of the helper signal is displayed on the line 23 as white 1
A 00% reference signal is inserted on line 623, but line 623 is not in the valid line and is removed here. The line 23 is within the effective line, but is replaced by a pedestal level by the masking signal generation circuit 35.

The output of the effective information extraction circuit 36 is supplied to the blocking and shuffling circuit 37. The blocking and shuffling circuit 37 blocks into (8 × 8) blocks, the compression is averaged over the entire screen, and data is intensively lost due to head clogs or tape damage. Shuffling is done to prevent this.

The output of the blocking and shuffling circuit 37 is supplied to the compression circuit 38. The compression circuit 38 is DC
The video data is compressed by T conversion and variable length coding. That is, the compression circuit 38 uses a DCT conversion circuit, a quantizer for quantizing the DCT-converted data, an estimator for estimating the total code amount and determining an optimum quantizer, and a two-dimensional Huffman code. And a variable length coding circuit for compressing data. Compression circuit 38
Then, the (8 × 8) time domain data is converted into (8 × 8) frequency domain coefficient data, which is quantized and variable length coded.

The output of the compression circuit 38 is the framing circuit 39.
Is supplied to. In the framing circuit 39, video data is packed in a predetermined sync block according to a predetermined rule. The output of the framing circuit 39 is the VAUX addition circuit 40.
Is supplied to.

VAUX data is supplied from the VAUX generation circuit 41 to the VAUX addition circuit 40. VAUX
The generation circuit 41 receives data VA from the controller 60.
UX data is given. VA with VAUX additional circuit 40
The video data added with the UX data is supplied to the multiplexer 42.

The terminal 43 is connected to the PALplus shown in FIG.
From the TR pack output terminal 25 of the signal recording circuit 3, WSS data and 100% white reference data are supplied as data to be written in the TR pack. VAU
The VAUX data generated from the X generation circuit 41 includes these data.

Specifically, the TR shown in FIG. 16 is added to VAUX.
A pack (header 66h) is provided, and the data of the identification signal is recorded in this TR pack. As described above, WSS data is stored in PC1 to PC3 of this TR pack as P
100% white reference data is recorded in C4. If, for some reason, 100% white reference data has not been acquired, this PC4
In the field, (FFh) is recorded. FIG. 6 shows a state in which these data are recorded in the TR pack.

As shown in FIG. 18, the aspect ratio information is the DISP (DisplaySel) of the VAUX source control pack (header PC0 = 61h).
ectMode). Also, the source pack whose color phase information is VAUX (header PC0 = 60
h) CLF (Color Frame Identifier)
ication Code).

An audio signal is supplied to the input terminal 44. This audio signal is supplied to the A / D converter 45. The audio signal is digitized by the A / D converter 45. This audio signal is supplied to the audio signal processing circuit 46. The audio processing circuit 46 packs audio data in a predetermined sync block. The output of the audio signal processing circuit 46 is supplied to the AAUX addition circuit 47.

Under the control of the controller 60, the AAUX adding circuit 47 outputs the AAUX signal from the AAUX generating circuit 48 to the AAUX generating circuit 48.
AUX data is provided. With the AAUX addition circuit 47,
AAUX data is added to the audio data. The audio data to which the AAUX data is added is supplied to the multiplexer circuit 42.

The subcode generating circuit 49 generates a subcode. The subcode data is used during high speed search. This subcode data is supplied to the multiplexer circuit 42.

The multiplexer circuit 42 switches between video data, audio data, and subcode data. The output of the multiplexer circuit 42 is supplied to the error correction coding circuit 50. The error correction coding circuit 50 adds an error correction code to the recorded data.
The output of the error correction coding circuit 50 is supplied to the channel encoder 51. The recording data is converted into 24/25 by the channel encoder 51. Here, the coding process of partial response class 4 suitable for digital recording is further performed. The output of the channel encoder 51 is supplied to the head 52 via a recording amplifier (not shown) and recorded on the recording tape in the above-mentioned format.

Next, the case of reproducing the signal recorded on the magnetic tape by the above method will be described. FIG. 7 shows an example of the structure of the digital VTR 4 of this reproducing system. In FIG. 7, the reproduction signal of the head 70 is
It is supplied to the channel decoder 71 via a reproduction amplifier (not shown). The reproduced signal is demodulated by the channel decoder 71. The output of the channel decoder 71 is supplied to the error correction circuit 72. The error correction circuit 72 performs error correction processing. The output of the error correction circuit 72 is supplied to the demultiplexer 73.

By the demultiplexer 73, the reproduction data of the audio area and the reproduction data of the video area,
It is separated from the reproduction data in the sub code area.

The reproduction data of the audio area is supplied to the audio processing circuit 76. Also, the AAUX data in the reproduced data in the audio area is detected by the AAUX decoding circuit 77. This AAUX data is supplied to the controller 90. The audio processing circuit 76 performs processing such as time axis conversion and interpolation. The output of the audio processing circuit 76 is supplied to the D / A converter 79. D
The output of the / A converter 79 is output from the output terminal 80.

The reproduction data of the video area is supplied to the deframe circuit 74. Further, VAUX data in the reproduced data in the video area is detected by the VAUX decoding circuit 75. This VAUX data is supplied to the controller 90.

PCs 1 to 3 of VAUX TR pack
WSS data can be obtained from. Similarly, PC4
Gives white 100% reference data. V
Color phase information is obtained from the AUX source pack. Aspect information can be obtained from the VAUX source control pack. These pieces of information are output from the data output terminal 89 and are described later in PALplus.
It is sent to the signal reproduction circuit 5.

The reproduction data of the sub code area is detected by the sub code decoding circuit 78. This subcode data is supplied to the controller 90.

The output of the deframe circuit 74 is the expansion circuit 81.
Is supplied to. The decompression circuit 81 decodes a variable length code,
The inverse DCT conversion converts the compressed and recorded video signal into the original time domain video signal. The output of the decompression circuit 81 is supplied to the deshuffling and deblocking circuit 82. From the deshuffling and deblocking circuit 82, reproduced component color video signals Y, C _B / C _R are obtained. Of these signals, the signal C _B / C _R is a line-sequential version of the color difference signals C _B and C _R , and the helper signal is superposed on the signal C _B / C _R.

The reproduction component color video signals Y and C _B / C _R are supplied to the information adding circuit 83. The information adding circuit 83 is for adding a horizontal synchronizing signal, a vertical synchronizing signal, and the like. The output of the information adding circuit 83 is D / A
It is supplied to the converter 84. This D / A converter 8
Of the four outputs, the reproduction luminance signal Y is output from the output terminal 85. On the other hand, the signal C _B / C _R is the line-sequential interpolation circuit 86.
To be reproduced color difference signals C _B and C _R and output terminal 8
7 and 88 are supplied.

When the PALplus video signal is reproduced, in this embodiment, the helper signal is inserted in the non-picture portion in the reproduced color difference signal C _B of the non-picture portion. Further, from the data output terminal 89, data regarding the presence / absence of aspect ratio information and color phase information is taken out. Further, the reproduction luminance signal Y is at the pedestal level in the vicinity of the boundary between the non-image part and the main image part as shown in FIG.

FIG. 8 shows an example of the configuration of the PALplus signal reproducing circuit 5. The reproduction luminance signal Y is supplied to the input terminal 100. This reproduction luminance signal Y is used as the gain control circuit 11
2 as well as to the sync separation circuit 108. This reproduction luminance signal Y contains the above-mentioned digital VT.
The horizontal synchronizing signal and the vertical synchronizing signal are added in advance by the information adding circuit 83 of R4. Sync separation circuit 108
The reproduced luminance signal Y supplied to the horizontal sync signal and the vertical sync signal are detected, and these signals are extracted.

These extracted sync signals are supplied to the line decoder switch circuit 111. With this line decoder switch circuit 111, the final stage adder 1
Timing is generated to control 14.

Reproduction color difference signals C _B and C _R are supplied to the input terminals 101 and 102, respectively. The reproduced color difference signals C _B and C _R thus supplied are respectively supplied to the chroma modulation circuit 10
5 and is chroma-modulated. The chroma signal C generated by subjecting C _B and C _R to the chroma modulation is supplied to the adder 109.

The reproduced color difference signal C _B supplied to the input terminal 101 is also supplied to the helper signal modulation circuit 104. As described above, in the reproduced signal C _B , the helper signal is superimposed on the non-picture portion, and this also includes the reference of the subcarrier in the latter half of the line 23. The helper signal and the subcarrier reference signal are modulated and supplied to the adder 109.

As described above, the chroma signal C is also supplied to the adder 109, and the chroma signal C, the helper signal, and the reference signal of the subcarrier are combined by the adder 109. This combined signal is supplied to the gain control circuit 112.

TR pack data is supplied to the input terminal 103. The supplied TR pack data is supplied to the latch circuit 106. In the latch circuit 106, the PC4 data of the TR pack data, that is, the reference data of 100% white is latched. This latched reference data is used by the D / A converter 1
10 and is converted into an analog signal. The converted analog signal is supplied to the adder 114.

The converted analog signal, that is, the 100% white reference signal is also supplied to the gain control circuit 112. As described above, the gain control circuit 112 is supplied with the reproduction luminance signal Y and a signal in which the chroma signal C, the helper signal, and the subcarrier reference signal are combined. The gains of these signals are controlled by the gain control circuit 112 by the white 100% reference signal. That is, the level of the reproduction luminance signal Y and the reference signal of the subcarrier is directly restored by the 100% white reference signal. Further, the levels of the chroma signal C and the helper signal are restored by the restored subcarrier reference signal. This allows faithful reproduction of the signal level during recording.

These signals gain-controlled by the gain control circuit 112 are supplied to the Y / C synthesis circuit 113, output as a Y / C synthesis signal, and supplied to the adder 114.

On the other hand, the TR pack data supplied to the input terminal 103 is also supplied to the WSS encoder 107. This TR pack data corresponds to this WSS encoder 1
At 07, the data of the PC1 to PC3 are extracted. This data is, in other words, a WSS signal indicating the aspect ratio and the presence / absence of a helper signal. The extracted WSS signal is supplied to the adder 114.

As described above, the adder 114 outputs the Y / C composite signal, the white 100% reference signal,
The reference signal of the subcarrier and the WSS signal are both supplied. A helper signal is superimposed on the non-image portion of the Y / C composite signal. The adder 114 is controlled by the timing generated by the line decoder switch circuit 108 as described above. By this control, the signal supplied to the adder 114 is output to the output terminal 115 at each predetermined timing.
Are output to the PALplus signal.

Specifically, it is as follows. Line 23
In the effective area, the WSS signal is output at the first half timing of the line 23, and the subcarrier reference signal is output at the second half timing of the line 23. At the timing of lines 24 to 310, the Y / C composite signal on which the helper signal is superimposed is output. Since the lines 311 to 335 are not effective areas, no signal is output at this timing. Line 336-
622 is within the effective area, and the Y / C composite signal on which the helper signal is superimposed is output at this timing as well. The line 623 is not in the effective area, but a white 100% reference signal is output at the timing of the first half of the line 623. Since the line 624 to the line 22 of the next field is not within the valid line, nothing is output at this timing.

Of the TR pack data, white 100
The data of PC4 which is the reference data of% is (FF
h), that is, when all the bits are “1”, as described above, this reference data has not been written at the time of recording. In this case,
At the time of reproduction, a reference value 235 of 100% white is inserted at a predetermined timing. Since the reliability of the reproduced data is extremely high in the digital VTR, by doing so, a high image quality can be expected to some extent even when the 100% white level at the time of recording is not accurately restored.

As a method of inserting a reference signal of 100% white at this time, for example, when TR pack data is read by the controller 90 of the digital VTR 4 at the time of reproduction, the PC4 data is represented by 235 representing 100% white.
It is possible to replace it with and output. In addition to this method, a conversion table is provided in the D / A converter of the PALplus signal reproduction circuit 5 at the time of reproduction, and the data of 235 is output when the data of (FFh) is supplied, or the analog signal. The reference voltage as a switch and a switch circuit for turning on / off the reference voltage,
D of the gain control circuit 112 of the Lplus signal reproduction circuit 5
The gain control circuit 112 is provided on the input path from the A / A converter 110, and the gain control circuit 112
It is conceivable that a predetermined reference signal is supplied to the.

[0098]

As described above, according to the present invention, the reference signal of 100% white level can be accurately restored.
There is an effect that a high-quality image of ALplus can be faithfully reproduced.

Further, by setting the reference data of 100% white as (FFh), even if the reference data is not saved at the time of recording, the reliability of the data of the digital VTR provides a certain high image quality. There is an effect that can be expected to be reproduced.

[Brief description of drawings]

FIG. 1 is a block diagram used for explaining a case of recording a PALplus signal.

FIG. 2 is a block diagram used for explaining a case of reproducing a PALplus signal.

FIG. 3 is a block diagram showing an example of a configuration of a PALplus signal recording circuit.

FIG. 4 is a schematic diagram showing a demodulated PALplus signal.

FIG. 5 is a block diagram of a recording system of a digital VTR to which the present invention is applied.

FIG. 6 is a schematic diagram showing that data is recorded in a TR pack.

FIG. 7 is a block diagram of a reproducing system of a digital VTR to which the present invention is applied.

FIG. 8 is a block diagram showing an example of a configuration of a PALplus signal reproducing circuit.

FIG. 9 is a schematic diagram used for explaining a track configuration in a digital VTR to which the present invention is applied.

FIG. 10 is a schematic diagram used for explaining audio data in a digital VTR to which the present invention is applied.

FIG. 11 is a schematic diagram used for explaining audio data in a digital VTR to which the present invention is applied.

FIG. 12 is a schematic diagram used to explain video data in a digital VTR to which the present invention is applied.

FIG. 13 is a schematic diagram used for explaining video data in a digital VTR to which the present invention is applied.

FIG. 14 is a schematic diagram used for explaining subcode data in a digital VTR to which the present invention is applied.

FIG. 15 is a schematic diagram used to describe a pack structure.

FIG. 16 is a schematic diagram used to describe a pack.

FIG. 17 is a schematic diagram used to describe a pack.

FIG. 18 is a schematic diagram used to describe a pack.

FIG. 19 is a schematic diagram used to describe a letterbox format.

FIG. 20 is a schematic diagram showing a PALplus signal.

FIG. 21 is a schematic diagram showing a PALplus signal.

FIG. 22 is a schematic diagram showing a signal of a line 23 in a PALplus signal.

FIG. 23 is a schematic diagram showing a signal on a line 623 in a PALplus signal.

FIG. 24 is a schematic diagram used to describe a PALplus signal.

FIG. 25 is a schematic diagram used to describe a line set to a pedestal level.

[Explanation of symbols]

3 PALplus signal recording circuit 4 Digital VTR 5 PALplus signal reproduction circuit 13 WSS decoder 18 Latch circuit 106 Latch circuit 107 WSS encoder 112 Gain control circuit

Claims (6)

(57) [Claims] 1. A digital video signal recording apparatus for compressing and recording on a recording medium a composite color video signal which is transmitted in a letterbox format and in which a signal for enhancing resolution is multiplexed in a non-screen portion, and is input. Extraction means for extracting the effective part of the signal
And is sent to a predetermined line of the above input video signal
Sump that samples the reference signal of the luminance signal
And ring means, and compressing means for compressing a video signal of the extracted said effective part by the extracting means, video signal of the effective part compressed by the compression means
And the data sampled by the above sampling means.
A digital video signal recording device , comprising: a recording unit for recording preliminary data stored in a predetermined area on a recording medium . 2. The digital video signal recording device according to claim 1, wherein the composite color video signal transmitted in the letterbox format and having a signal for reinforcing resolution multiplexed in a non-screen portion is a PALplus signal. , The predetermined line to which the reference signal of the luminance signal is sent is line 6
23 is a digital video signal recording device. 3. The digital video signal recording device according to claim 1, wherein when the reference signal of the luminance signal cannot be acquired, the data in a predetermined area of the spare data is set to (FFh). Digital video signal recording device characterized by. 4. is transmitted in letterbox format, the digital video signal reproducing apparatus to which a signal for reinforcing the resolution no screen unit reproduces the recording medium the composite color video signal multiplexed is recorded by compressing, While the effective part of the video signal is compressed and recorded,
Of the luminance signal sent to the specified line of the video signal
The data obtained by sampling the reference signal is
Re-install the recording medium on which the preliminary data stored in the area is recorded.
Reproducing means for raw, on has been the effective portion reproduced by said reproducing means is compressed
And expanding means for expanding the serial video signal, collected reference data to obtain the reference data of the preliminary data or RaTeru degree signal reproduced by said reproducing means
The acquisition means and the above-mentioned acquired by the reference data acquisition means
Converts the reference data of the luminance signal into an analog signal
The reference signal of the restored the luminance signal Te above Shin
Add to a predetermined line of video signal expanded by long means
A digital video signal reproducing apparatus comprising: an addition unit . 5. The digital video signal reproducing apparatus according to claim 4, wherein when the data of the reference signal of the luminance signal reproduced from the preliminary data is (FFh), the reference signal of the luminance signal is 100% white when reproduced. A digital video signal reproducing device characterized by being set to a predetermined level and being inserted into a predetermined line. 6. The digital video signal reproducing apparatus according to claim 4 or 5, wherein the predetermined line into which the reference signal of the luminance signal whose level is 100% white is inserted is line 623. Playback device.