JP3794815B2 - Information recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of recording digital information on a recording medium, and more specifically, when a recording error indicating a state in which the recording operation has to be interrupted due to a disturbance or the like occurring during the recording operation occurs. The present invention belongs to a technical field that ensures the continuity of digital information recorded on a recording medium due to a recording error.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a so-called DVTR (Digital Video Tape Recorder) is known as an information recording apparatus capable of recording a digital signal carrying information such as a moving image. Further, the present applicant has proposed a recording / reproducing apparatus that apparently simultaneously records and reproduces digital signals on an optical disk as Japanese Patent Application No. 10-9833.
[0003]
[Problems to be solved by the invention]
However, no effective apparatus for repairing the recording error has been proposed in the above-described conventional DVTR (Digital Video Tape Recorder) that handles digital signals and the information recording apparatus proposed by the present applicant.
Therefore, for example, when a recording error occurs due to a pickup being skipped from an information recording track due to an external impact or the like, there is a problem in that the information to be recorded is lost because the recording of the disc is not performed normally. there were.
[0004]
The present invention has been made in view of the above problems, and even if there is a case where defocusing or tracking error occurs due to disturbance or the like during information recording, and recording on the disk cannot be performed normally, the recorded information is recorded. An object of the present invention is to provide an information recording apparatus capable of improving convenience by apparently recording everything normally without interrupting recording.
[0005]
[Means for Solving the Problems]
  In order to solve the above problems, the information recording apparatus of the present invention generates compressed data by compressing digital data at a predetermined compression rate.A compression circuit; a recording buffer memory for temporarily storing and outputting the compressed data; an encoder for encoding the compressed data stored in the recording buffer memory; and recording the encoded compressed data on a recording medium A recording means; a recording error detecting means for detecting whether or not the recording means is in a recordable state; and a first backup for backing up the compressed data output from the recording buffer memory when the compressed data can be recorded. A second backup memory that backs up the compressed data output from the recording buffer memory, a recording buffer memory, the first backup memory, From any of the second backup memories, the encoder And control means for controlling the compression circuit so that the compressed data is output to a data processor, and when the error detecting means detects a state in which recording is not possible, the control means When the compression circuit is controlled to generate the compressed data by compressing the digital data at a compression rate higher than the compression rate, and when it is detected that the error detection unit has returned to a recordable state, the control unit Causes the encoder to output the compressed data backed up in the first backup memory, and when there is no compressed data backed up in the first backup memory, the backed up data in the second backup memory Compressed data is output to the encoder and backed up in the second backup memory When the serial compressed data is eliminated, and controls the compression circuit to compress the digital data by said predetermined compression rate.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings. In the embodiment described below, a disc-shaped recording medium (hereinafter simply referred to as an optical disc) capable of optically recording and reproducing information, and information capable of recording and reproducing information corresponding thereto. In this embodiment, the present invention is applied to a recording / reproducing apparatus.
[0007]
First, the configuration of the information recording / reproducing apparatus S according to the embodiment will be described with reference to FIG.
As shown in FIG. 1 (a), an information recording / reproducing apparatus S of an embodiment includes a pickup 2 as a recording means and a detection means, an A / D (analog / digital) converter 3, and a compression circuit 4 as a processing means. A recording buffer memory 5 as a recording information storage means, a first switch 6 and a second switch 9 as a backup memory switching means, a first backup memory 7 and a second backup memory 8, an encoder 10, a recording A circuit 11, a reproduction circuit 12, a recording error detection unit 13 in the pickup 2, a decoder 14, a reproduction buffer memory 15 as a storage means, an expansion circuit 16 as a reprocessing means, a D / A (digital / Analog) converter 17, spindle motor 18, CPU 19 as control means, servo circuit 20, and operation And 21, and a display unit 22.
[0008]
Among the above configurations, the pickup 2, the A / D converter 3, the compression circuit 4, the recording buffer memory 5, the first switch 6, the first backup memory 7, the second backup memory 8, the second switch 9, the encoder 10, and the recording The circuit 11 constitutes an information recording unit R as information recording means.
The pickup 2, the reproduction circuit 12, the decoder 14, the reproduction buffer memory 15, the decompression circuit 16 and the D / A converter 17 constitute an information reproduction unit P as information reproduction means.
[0009]
Next, the general operation of each component will be described.
First, the case where information to be recorded from the outside is recorded on the optical disc 1 as a recording medium will be described.
An information signal Sin (analog signal) corresponding to information to be recorded from outside (specifically, the information to be recorded includes image information and / or audio information) is preset. When input at the input rate, the A / D converter 3 digitizes the information signal Sin, generates a digital information signal Sd, and outputs it to the compression circuit 4.
The compression circuit 4 compresses the input digital information signal Sd based on the control signal Sct5 output from the CPU 19, generates a compressed information signal Spd, and outputs it to the recording buffer memory 5. At this time, when the digital information signal Sd is compressed, for example, a compression method such as MPEG2 (Moving Picture coding Expert Group 2) method is used.
[0010]
Next, the recording buffer memory 5 temporarily stores the input compressed information signal Spd as it is. At this time, the recording buffer memory 5 always outputs a data amount signal Smr indicating the data amount of the accumulated compressed information signal Spd to the CPU 19.
The first switch 6 sends a compressed information signal Spd output from the recording buffer memory 5 in response to a switch control signal Ssw1 output from the CPU 19 to be described later, and the terminal a of the second switch 9 and the first backup memory 7 (both are the first backup memory 7). 1 is connected to the terminal a of the switch 7) or the second backup memory 8 (connected to the terminal b).
[0011]
The first backup memory 7 is a so-called FIFO (First-ln / First-Out) type memory. When a compressed information signal Spd exceeding the storage capacity is supplied, the first backup memory 7 starts from the previously stored information signal. It is configured to be updated and stored in order. Therefore, while the normal recording is being performed, the compressed information signal Spd having the storage capacity-full is always updated and stored. The compressed information signal Spd output from the first backup memory 7 is supplied to the terminal b of the second switch 9.
[0012]
The second backup memory 8 is provided to store the compressed information signal Spd output from the recording buffer memory 5 when the big-up 2 which is a recording means to be described later cannot be recorded. As with the first backup memory 7, it is a FIFO type memory. The output of the second backup memory 8 is supplied to the terminal c of the second switch 9. As will be described later, the compressed information signal Spd is not stored in the second backup memory 8 when the normal recording is performed.
[0013]
Next, the second switch 9 sends the compressed information signal Spd supplied from any one of the recording buffer memory 5, the first backup memory 7 and the second backup memory 8 in response to a switch control signal Ssw2 which will be described later outputted from the CPU 19. Is relayed to the encoder 10.
Next, based on the control signal Sct4 output from the CPU 14, the encoder 10 temporarily records the compressed information signal Spd recorded in the recording butterfly memory 5 at a recording rate higher than the input rate of the information signal Sin. This is read out and encoded (encoded) to generate an encoded signal Sed and output to the recording circuit 11.
Then, the recording circuit 11 converts the input encode signal Sed into a recording signal Sr for recording based on the control signal Sct2 output from the CPU 19 and outputs it to the pickup 2. At this time, in the recording circuit 11, so-called write strategy processing or the like is performed on the encoded signal Sed in order to form a pit having a shape accurately corresponding to information to be recorded on the optical disc 1 described later.
[0014]
Sln Next, the pickup 2 generates a light beam B such as a laser beam by driving a light source such as a semiconductor laser (not shown) in the pickup 2 based on the recording signal Sr output from the recording circuit 7. By irradiating the information recording surface of the optical disk 1 and forming pits corresponding to the recording signal Sr, the information signal Sin is recorded on the optical disk 1 at a speed corresponding to the recording rate Rr.
Further, the pickup 2 applies a calculation process based on a well-known tracking error generation method such as a push-pull method to the reflected light from the optical disc 1 of the light beam B irradiated on the optical disc 1 to obtain a tracking error signal. Ste is generated, and the tracking error signal Ste is output to the recording error detector 13.
[0015]
The recording error detection unit 13 includes a comparator that compares the supplied tracking error signal Ste with a predetermined reference value. The recording error detection unit 13 is in a state where tracking control is performed by a servo circuit 20 described later, and the tracking error signal is When the predetermined reference value is exceeded, it is determined that a recording error has occurred, and a recording error detection signal Se is output to the CPU 19. Normally, in the state where tracking control of the light beam B is being performed, the tracking error signal is approximately 0 level. However, when the tracking control is disturbed due to a disturbance, the tracking error signal according to the magnitude of the disturbance. The amplitude level of becomes large. Therefore, when the predetermined reference value is set to the maximum amplitude level at which tracking control can be performed by the servo circuit 20, when a tracking error signal larger than the reference value is generated, the servo circuit 20 Is in a state where the tracking control of the light beam B is not possible, that is, the recording error detection signal Se is output to the CPU 19 assuming that the light beam B is out of the desired recording track.
[0016]
The optical disk 1 is rotated at a predetermined rotational speed by a spindle motor 18 driven based on a spindle control signal Ssm described later. On the optical disc 1, for example, pits corresponding to the recording signal Sr are formed by the phase change method, and the information signal Sin is recorded.
[0017]
Next, an operation for reproducing information recorded on the optical disc 1 will be described.
At the time of reproduction, first, the pickup 2 irradiates the reproducing optical beam B onto the rotating optical disk 1, and based on the reflected light, the detection signal Sp corresponding to the pit formed on the optical disk 1 is detected as the detection rate Rp. And output to the reproduction circuit 12.
[0018]
Next, the reproduction circuit 12 amplifies the output detection signal Sp with a predetermined amplification factor based on the control signal Sct1 output from the CPU 19, shapes the waveform thereof, generates the reproduction signal Spp, and decodes it. 14 for output.
Based on the control signal Sct3 output from the CPU 19, the decoder 14 decodes the reproduction signal Spp by a decoding method corresponding to the encoding method in the encoder 10, generates a decoded signal Sdd, and detects the detection signal Sdd. The data is output to the reproduction buffer memory 15 at a speed corresponding to the rate Rp.
[0019]
Next, the reproduction buffer memory 15 temporarily stores the input decode signal Sdd as it is. At this time, the reproduction buffer memory 5 always outputs a data amount signal Smp indicating the data amount of the accumulated decode signal Sdd to the CPU 19.
Next, the decompression circuit 16 outputs the decode signal Sdd temporarily stored in the reproduction buffer memory 15 based on the control signal Sct6 output from the CPU 19 lower than the detection rate Rp of the detection signal Sp. The decompression process corresponding to the compression process in the compression circuit 4 is performed on the read decode signal Sdd at the rate Mp, and the decompression signal So is generated and output to the D / A converter 17.
The D / A converter 17 converts the decompressed signal So into an analog signal, generates an output signal Sout corresponding to the information signal Sin, and outputs the output signal Sout to the outside.
[0020]
Along with the information recording and information reproduction operations described above, the CPU 19 outputs the control signals to execute predetermined processing based on the data amount signal Smp or Smr and the recording error detection signal Se. At this time, by using the operation unit 21 and the display unit 22 together, the instruction signal Sc from the operation unit 21 corresponding to the operation performed by the user or the like is output to the CPU 19, and the CPU 19 performs the above operation based on the instruction signal Sc. Each control signal is output.
[0021]
In parallel with this, the CPU 19 generates a control signal Sct7 for servo-controlling the spindle motor 18 and the pick-up 2 and outputs the control signal Sct7 to the servo circuit 20. The servo circuit 20 is based on the control signal Sct7. The spindle control signal Ssm for controlling the rotation of the pickup 2 is generated and output to the spindle motor 18, and the pickup control signal Ssp for so-called tracking servo control and focus servo control in the pickup 2 is generated and the pickup Output to 2. The pickup 2 records the recording signal Sr (information signal Sin) or detects the detection signal Sp while performing tracking servo control and focus servo control on the light beam B based on the pickup control signal Ssp. Information necessary for the user to control the operation of the information recording / reproducing apparatus S described above is displayed on the display unit 22 based on the display signal Sdp from the CPU 19.
[0022]
Next, the information recording operation of the information recording unit R according to the present invention in the information recording / reproducing apparatus S having the above configuration will be described with reference to FIG. (The information reproducing operation in the present invention is the same as the information recording / reproducing apparatus S already proposed in Japanese Patent Application No. 10-9833, and is therefore omitted.)
First, when the information recording / reproducing apparatus S is in a normal information recording state, the first switch 6 and the second switch 9 change to the connection state shown in FIG. 1 according to the switch control signals Ssw1 and Ssw2 supplied from the CPU 19. The compressed information signal Spd from the recording buffer memory 5 is directly input to the encoder 10 without the first backup memory 7 being interposed. Whether or not recording is impossible in step 1 is determined. If the recording error detection unit 13 is in a normal state where the recording impossible signal Se is not output (step S1; no), the process jumps to step 11 and 1. The normal state of recording directly without passing through the second backup memory is maintained.
[0023]
On the other hand, when a tracking error occurs due to vibration of the pickup 2 due to impact or the like and the recording error signal Se is output by the recording error detector 13 (step S1; yes), as shown in FIG. When the switch control signal Ssw1 is output, the first switch 6 is switched to the terminal b to supply the output of the recording buffer memory 5 to the second backup memory 8 and stop reading into the first backup memory 7 (step S2). .
[0024]
Next, a rate control signal Sct5 is output from the CPU 19, and the compression rate for the digital information signal Sd in the compression circuit 4 is increased. That is, the information amount of the compressed information signal Spd relative to the unit information amount of the digital information signal Sd (for example, one frame of the video signal) is made smaller than the information amount before the recording error is detected. As a result, the transfer rate of the compressed information signal Spd to the recording buffer memory 5 is reduced (step S3). Since the supply of a new compressed information signal Spd to the first backup memory 7 is stopped, the stored content is not updated, and the first backup memory 7 keeps the currently stored information as it is. Will be held.
[0025]
In the next step S4, it is determined whether or not the signal Se from the recording error detection unit 13 has converged within the predetermined reference value, that is, whether or not the pickup 2 has returned to a recordable state, and is in a recordable state. Otherwise (step S4; no), the connection state of the first switch 6 and the second switch 9 shown in FIG.
On the other hand, if it is determined in step S4 that the pickup 2 is in a recordable state (step S4; yes), based on the switch control signal Ssw2 output from the CPU 19, as shown in FIG. The second switch 9 connects the terminal b to the encoder 10 and records the compressed information signal Spd backed up in the first backup memory 7 again from the position where the recording was interrupted due to the detection of the recording error.
[0026]
Next, in step S6, it is determined whether or not the compressed information signal Spd backed up in the first backup memory 7 has become empty. If the compressed information signal Spd still remains (step S6; no), the recording operation is performed. To continue.
On the other hand, when the compression information signal Spd backed up in the first backup memory 7 becomes empty (step S6; yes), the process proceeds to step S7, and the switch control signal Ssw2 output from the CPU 19 causes the switch information signal Ssw2 to be transferred to FIG. 2, the second switch 9 connects the terminal c to the encoder 10, and records the compressed information signal Spd on the optical disc 1, the compression rate of which is increased by the step S <b> 3 backed up by the second backup memory 8. .
[0027]
Next, the process proceeds to step S8, where it is determined whether or not the compressed information signal Spd backed up in the second backup memory 8 has become empty. If there remains any compressed information signal Spd (step S8; no) Continue recording.
On the other hand, if it is determined in step S8 that the compression information signal Spd of the second backup memory 8 has become empty (step S8; yes), the first switch 6 and the switch 6 are switched by the switch control signals Ssw1 and Ssw2 output from the CPU 19. The connection state of the second switch 9 is returned to the state shown in FIG. 1A, that is, the normal connection state in which the output of the recording buffer memory 5 is supplied directly to the encoder 10 and supplied to the first backup memory 7 (step). S9).
[0028]
Next, the process proceeds to step S10, where the compression rate in the compression circuit 4 is restored based on the rate control signal Sct5 output from the CPU 19 (in this case, the compression rate is lowered), and the recording buffer memory for the compression information signal Spd. The transfer rate to 5 is increased (step S10).
The normal recording state in which the compressed information signal Spd output from the recording buffer memory 5 without directly passing through the first and second backup memories is directly recorded by the above steps is restored (step S11).
[0029]
Next, the information recording described with reference to the flowchart of FIG. 3 is performed using FIG. 4 with a focus on changes in the amount of accumulated data in the recording buffer memory 5, the first backup memory 7, and the second backup memory 8. explain. FIG. 3 shows a change in the amount of data stored in each memory when the recording error detection unit 13 detects an unrecordable signal Se during information recording. Further, FIG. 3 shows the change of the pickup 2 in FIG. In the diagram showing the state, the time zone indicated by the hatched square frame area is the compression information signal compressed at the compression rate in the normal recording operation (the above-mentioned small compression rate). The time zone indicated by the area of the square frame hatched by the vertical line indicates that the recording is executed, and the compression ratio in the recording operation by the backup processing accompanying the detection of the recording error (the above large compression) This indicates that recording of the compressed information signal Spd compressed is performed.
[0030]
First, in the normal recording operation, the recording buffer memory 5 always stores the compressed information signal Spd at the input rate Mr1 based on the small compression rate. Therefore, normally, the amount of data stored in the recording buffer memory 5 is the slope of the input rate Mr1. To increase. Further, the first backup memory 7 always stores the backup data in the full recording capacity (Bu1). When it is determined that the accumulated amount in the recording buffer memory 5 exceeds the predetermined amount Vth at time t0 and the discharge operation to the encoder 10 is performed via the first switch 6 and the second switch 9, the first switch 6, the compressed information signal Spd discharged from the recording buffer memory 5 is also supplied to the first backup memory 7 via 6, so that the stored contents of the first backup memory 7 are stored in the new compressed information signal Spd. Updated to When the discharge of the predetermined amount V0 of the compressed information signal Spd is finished, the accumulation operation of the compressed information signal Spd transmitted at the input rate Mr1 based on the small compression rate is started again (time t1).
[0031]
Now, when the detection signal Se indicating that the recording of the pickup 2 is impossible is detected by the recording error detection unit 13 at time t2 (step S1; yes), as shown in FIG. In response to Ssw1, the first switch 6 connects the recording buffer memory 5 to the second backup memory 8, and the compression circuit 4 sets the compression rate of the digital information signal Sd based on the control signal Sct5 output from the CPU 19. In other words, the input current Mr1 is lowered to the input rate Mr2 based on the above-described large compression rate, and the compressed information signal Spd is supplied to the recording buffer memory 5 (steps S2 and S3).
[0032]
When the storage capacity of the recording buffer memory 5 exceeds the predetermined amount Vth based on the supply of the compressed information signal Spd (input Mr2) (time t3), the predetermined amount V0 is discharged. At this time, since the pickup 2 has not yet been restored, the predetermined amount V0 of the compressed information signal Spd discharged from the recording buffer memory 5 is not recorded on the optical disc 1 but is stored in the second backup memory 8. (Times t3 to t4). The above operation is repeated until the pickup 2 returns to a recordable state at time t5 (step S4; no).
[0033]
When the pickup 2 returns to a recordable state at time t5 (step S4; yes), as shown in FIG. 2B, a switch control signal Ssw2 is output from the CPU 19, and the second switch 9 is connected to the first backup memory. 7 is connected to the encoder 10. Therefore, the backup data (data updated at times t0 to t1) that is the compression information signal Spd stored in the first backup memory 7 with a small compression rate is added to the additional recording position (in the case of FIG. 4, at time t1 in the case of FIG. 4). The recording is started from the position where the recording is completed (step S5). This is continued until the backup data stored in the first backup memory 7 becomes zero at time t7 (step S6). Note that, during the recording of the backup data in the first backup memory 7 onto the optical disk 1, the accumulated amount of the compression information signal Spd having a large compression rate in the recording buffer memory 5 exceeds the predetermined amount Vth (time t6). The compressed information signal Spd of the predetermined amount V0 is output from the recording buffer 5 to the second backup memory 9. Therefore, during this period, the second backup memory 9 stores the compression information signal Spd having a large compression rate.
[0034]
When the backup data in the first backup memory 7 becomes empty at time t7 (step S; yes), the CPU 19 outputs a switch control signal Ssw2 to the second switch 9, and as shown in FIG. The backup memory 7 is connected to the encoder 10 (step S7). Therefore, on the optical disk, the backup data (data compressed at a large compression rate) of the second backup memory 8 follows the backup data (data compressed at a small compression rate) of the first backup memory 7. Will be recorded. As shown in this embodiment, when the time t6 is in the middle of outputting the compression information signal Spd of the predetermined amount V0 from the recording buffer memory 5 (in this example, it continues until time t8), 2 Since the speed at which backup data is taken out from the backup memory 8 and the speed at which the compressed information signal Spd is written into the second backup memory 8 are the same, the amount of data stored in the second backup memory 8 does not change.
[0035]
Next, when it is determined that the accumulated amount of the second backup memory 8 has become zero at time t9 (step S8; yes), the CPU 19 outputs switch control signals Ssw1, Ssw2, and the recording buffer memory 5 in the first buffer memory 5. The first backup memory 7 is connected via the switch 6 and the encoder 10 is directly connected via the second switch 9. Further, the CPU 19 outputs a rate control signal Sct5 to the compression circuit 4 to lower the compression rate of the digital information signal Sd, that is, return to the original small compression rate, and compress the compressed information signal Spd compressed at the compression rate Is supplied to the recording buffer memory 5 (steps S9 and S10). From time t8 to time t9, the compressed information signal Spd of the incoming current Mr2 is stored in the recording buffer memory 5, and after the time t9, the compressed information signal Spd of the incoming current Mr1 is stored. In the compressed information signal Spd that is discharged when the storage amount of the memory 5 exceeds the predetermined amount Vth, the compressed information signals of the above-mentioned input rates Mr1 and Mr2 are mixed, but thereafter, the normal recording operation state is restored.
[0036]
The reason why the compression rate of the compression circuit 4 is increased when a recording error occurs in the present invention is to secure the time required for the pickup 2 in a state where recording is impossible to return to a state where recording is possible. . That is, since the storage capacity of the second backup memory 9 is finite, for example, the smallest compression rate recognized by the information recording apparatus S in this embodiment (in this case, per unit time output from the compression circuit 4) The amount of information can be maximized.) By storing the data at a higher compression rate than by storing it in the second backup memory 9 as it is, the amount of information per unit time can be reduced. The memory 9 can secure a backup time (amount of information to be stored).
[0037]
Of course, increasing the compression rate will lower the signal quality compared to information without increasing the compression rate, but the time to increase the compression rate is the time it takes for the pickup to return and can be seen throughout the playback time. If it is short enough, it won't cause too much visual problems. Rather, by using the present invention, it is preferable that recording information to be recorded can be recorded on the optical disc without interruption, that is, the continuity of the information signal is compensated.
[0038]
In addition, the recording error detection unit 13 has described an example in which a recording error is detected based on the tracking error signal Ste. However, the present invention is not limited to this. It is also possible.
[0039]
  As explained above,According to the present invention, having the above-described features,Even when a state in which information recording cannot be normally performed on the disc due to defocusing or detracking occurs during information recording, the recording information can be recorded while maintaining continuity.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of an information recording / reproducing apparatus according to an embodiment.
FIG. 2 is a diagram for explaining the operation of the first and second backup memories, the first switch, and the second switch according to the embodiment.
FIG. 3 is a flowchart showing an information recording operation according to the embodiment.
FIG. 4 is a diagram illustrating changes in the amount of accumulated data in the recording buffer memory and the first and second backup memories.
[Explanation of symbols]
1 ... Optical disc
2 ... Pickup
3. A / D converter
4 ... Compression circuit
5. Recording buffer memory
6 ... 1st switch (SW1)
7: First backup memory
8 ... Second backup memory
9 ... Second switch (SW2)
10 ... Encoder
11 ... Recording circuit
12 ... Reproduction circuit
13: Recording error detector
14 ... Decoder
15: Playback buffer memory
16 ... expansion circuit
17 ... D / A converter
l8 ... Spindle motor
19 ... CPU
20 ... Servo circuit
21. Operation unit
22 ... Display section
B ... Light beam
S: Information recording / reproducing apparatus
P ... Information reproduction unit
R: Information recording part
Sin ... Information signal
Sd: Digital information signal
Spd: Compression information signal
Sed: encode signal
Sr ... Recording signal
Se: Unrecordable signal
Ssw1, Ssw2 ... Switch control signal
Spp ... Detection signal
Spp: Playback signal
Sdd ... decode signal
So ... Extension signal
Sout ... Output signal
Smr, Smp ... day signal
Sc: Instruction signal
Sct1, Sct2, Sct3, Sct4, Sct5, Sst6, Sct7 ... Control signal
Ssp ... Pickup control signal
Ssm: Spindle control signal
Sdp: Display signal

Claims (1)

A compression circuit that compresses digital data at a predetermined compression rate to generate compressed data ;
A recording buffer memory for temporarily storing and outputting the compressed data;
An encoder for encoding the compressed data stored in the recording buffer memory;
Recording means for recording the encoded compressed data on a recording medium;
Recording error detection means for detecting whether or not the recording means is in a recordable state;
A first backup memory for backing up the compressed data output from the recording buffer memory when the compressed data can be recorded;
A second backup memory that backs up the compressed data output from the recording buffer memory when a state in which recording is impossible is detected by the recording error detection means;
Control means for controlling the compression circuit to control the compressed data to be output from the recording buffer memory, the first backup memory, or the second backup memory to the encoder;
With
If the error detection means detects a state that cannot be recorded,
The control means controls the compression circuit to generate the compressed data by compressing the digital data at a compression rate higher than the predetermined compression rate;
If it is detected that the error detection means has returned to a recordable state,
The control means causes the encoder to output the compressed data backed up in the first backup memory, and when the compressed data backed up in the first backup memory disappears, it is backed up in the second backup memory. The compressed data being output to the encoder, and when the compressed data backed up in the second backup memory is exhausted, the compression circuit is controlled to compress the digital data at the predetermined compression rate. A characteristic information recording apparatus.

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