JPS60239965A - Video tape recorder - Google Patents

Abstract

PURPOSE:To shorten the time spent in access by recording and reproducing various programs after delaying them by a time corresponding to integer-fold reduced pitch of reduced tracks which are formed by dividing equally the pitch of a recording track. CONSTITUTION:When recording in the first mode is selected by an operation part 26, a tape is fed in the same speed as the normal recording mode, and signals outputted from a recording part 12 are recorded as a program (a) on a reduced track 6 of a reduced pitch W4 obtained by dividing equally the pitch of the fundamental track into three. In recording in the second mode, a switching contact of a switching part 21 is switched to connect a delay circuit 20 to a running control part 22. Then, the control part 22 is operated after the delay of a prescribed time by a reproducing control signal outputted from a reproducing part 18, and a track where a program (b) is recorded is formed in a position adjacent to each track where the program (a) is recorded. In the third mode, individual tracks where a program (c) is recorded are formed adjacently to individual tracks where the program (b) is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to recording and playback of a video tape recorder.

(Prior Art) There are already videotape recorders that are capable of recording for a long time on the same tape and are capable of recording more programs.

That is, in contrast to the normal recording mode (SP mode) in which recording is performed using the pitch (Wl) of recording track 1 and the pinch (W2) of control track 2 as shown in FIG. 3(A), the recording mode shown in FIG. As shown, the recording track 1
The pinch (Wl) of the control track 2 and the pitch (W2) of the control track 2 are each divided into 1/3 to form new recording tracks 3 and control tracks 4, and these recording trunks 3. This is a so-called LP mode in which the same information as that corresponding to one trunk in the SP mode is recorded in the control trunk 4.

However, when multiple programs (for example, programs a and b in FIG. 3) are recorded in such SP mode or LP mode, it is necessary to turn the tape to find the beginning of a program recorded near the end of the tape. It is necessary to send a large number of programs, and the access time required to search for a desired program increases.

For example, in a learning device, a question and the answer to that question may exist on tracks very far apart, and it takes an extremely long time to extract the answer to the question, making it impractical.

(Object of the Invention) In view of the above, the present invention records and reproduces various programs by delaying the reduced pitch which is an integral multiple of the reduced track formed by dividing the pitch of the recording track into a plurality of equal parts. The object of the present invention is to provide a video tape recorder that can be accessed at high speed.

(Structure of the Invention) According to the present invention, a reproduction control signal controls a delay means for recording and reproducing by delaying an integer multiple of the reduced pitch of a reduced track formed by dividing a pinch of a recording track into a plurality of equal parts. This relates to a video tape recorder.

(Example) The configuration of the present invention will be described below with reference to the drawings in terms of two examples.

FIGS. 1A, 1B, and 1C show three modes recorded by the video tape recorder according to the present invention.

FIG. 1(A) shows the recording state in the 2-first mode.

Program a (consists of al, a2...)
is a reduced track 6 consisting of a reduced pinch (W4) formed by dividing the pitch (W3) of the basic track 5 into 1/3.
Program a is recorded in .

On the other hand, the control track 7 is divided into pinches (W5) corresponding to the pinches (w3) of the basic track 5.
control signals are recorded. The control signal is provided to match the relationship between the tape advance and the rotational position of the video head during playback to the relationship during recording, and is a control signal that ensures the recording and playback conditions in the second mode and third mode, which will be described later. It also serves as a signal.

FIG. 1(B) shows the recording state in the second mode.

In addition to the program a recorded in the first mode, a program b (consisting of bl, b2, . . . ) is recorded.

In this case, each track b1 constituting program b
．． b2... are formed at positions adjacent to each track al, a2... constituting the program a, and the control track 7 is pinched (W5) as in the first mode, unlike the conventional No such division has been made.

FIG. 1(C) shows the recording state of the 27th code.

In addition to programs a and b recorded in the second mode, a program c (consisting of cl, c2, . . . ) is recorded.

In this case, each track cl making up program C
, c2 . . . are sequentially inserted into the empty portion of the basic track 5.

In addition, in these two examples, three modes are recorded at the same time, so
Since the audio signal cannot be recorded by bias recording using a fixed head (not shown), the audio signal is FM multiplex modulated and recorded on the reduced track 6. Therefore, in the conventionally used audio trunk 8 (see FIG. 2), a word 11) identifying the mode is recorded. The contents of the ID word include 1) the start point and end point of each program, 2) the time from the beginning of the program, and 3) a number indicating the program number among various modes. , their contents are recorded for the purpose of distinguishing them from other programs when recording various programs.

The IIID word is recorded as a carrier having a frequency of, for example, 3011z to about 10 KHz, with codes corresponding to various modes. Further, the writing point of the 10 words is the control track 7 in the first mode.
In the second mode and the third mode, the pulse recorded in the first mode is
It is written to fill in the space where the D word was written.

FIG. 2 shows a block diagram of a circuit configuration for performing recording and reproduction in the various modes described above.

During recording, the audio signal input through the audio processing section 10 and the video signal input through the video processing section 11 are converted into frequency multiplex modulated signals, and then sent through the recording section 12 to the video/audio signal. The head 13 writes on the basic track 5 or the reduced track 6.

On the other hand, during reproduction, the video/audio head 13 picks up the frequency-multiplexed modulated signal as described above, and outputs it via the reproduction section 14. and,
It is demodulated by the video processing section 15, converted into a standard color television video signal, and outputted.
6, the signal is tuned to FMfj7L, converted into an audio signal, and output.

Control signals outputted from the recording section 17 are recorded on the control track 7 by a control head 23, and during reproduction, these signals are read from the control head 23, and a reproduction control signal is outputted via the reproduction section 18. The playback control signal is SP
A selection section 19 that selects the mode or LP mode, and a delay circuit 20 that delays the playback control signal for a predetermined period of time.
It is designed to be entered as follows. On the other hand, 9 selection section 19
The output of the delay circuit 20 and the output of the delay circuit 20 are switched via the switching section 21 and input to the travel control section 22 . and,
Based on these signals, the travel control section 22 controls the relationship between the tape advance during playback and the rotational position of the video head to match the relationship during recording.

Furthermore, the 10 words read by the 10 head 24 are input to the system control section 25, and the system control section 25 uses the ID word as information and operates the recording section 172 selection section 19. Delay circuit 2
0. Controls the switching unit 21.

When recording in the first mode is selected by the operation unit 26 in the video tape recorder having the above configuration, the tape speed is fed at the same speed as in the conventional SP mode, and the signal output from the recording unit 12 is transmitted as shown in FIG. Record program a in the state shown in A). Also, a control signal and an ID word identifying the first mode are recorded.

Next, in recording in the second mode, the control signal recorded in the first mode is reproduced, the switching contact of the switching unit 21 is switched, the delay circuit 20 is connected to the traveling control unit 22, and the control signal corresponding to the second mode is switched. The ID word corresponding to the first seven-word is recorded adjacent to the Irl word corresponding to the first seven-word. Therefore, the reproduction control signal output from the reproduction section 18 is delayed by a predetermined amount of time, and operates the travel control section 22.

The recording state is made as shown in FIG. 1(B).

Note that the predetermined time is set to the time required to travel through the reduced pinch (W4).

Further, when recording in the third mode, the control signal recorded in the first mode is reproduced, and the delay circuit 20 activates the travel control section 22 with a further delay of a predetermined time from the position recorded in the second mode. , Figure 1 (C)
The recording state is as shown in . On the other hand, an ID word corresponding to the third mode is recorded adjacent to an ID word corresponding to the second mode.

By the way, by various modes as mentioned above.

To reproduce the recorded information, when a mode is selected by the operation section 26, the system control section 25 selects the selection section 1.
9. Delay circuit 20. The desired program is selected by controlling the switching unit 21 to appropriately delay the reproduction control signal. At this time, the ID word is detected by the head 24 and used for displaying the start point, end point, other detection points, and cue of the program.

(Effects of the Invention) The present invention records and reproduces various programs with a delay of an integral multiple of the reduced pitch of a reduced track formed by dividing the pitch of a recording track into a plurality of equal parts.

Since the tracks constituting the program are formed adjacent to each other, the time required for access can be shortened, and it is possible to meet the demand for high-speed access for learning devices and the like.

[Brief explanation of the drawing]

1(A), 1(B), and 1(C) illustrate recording states by the video tape recorder according to the present invention, in which FIG. 1(A) shows the first mode, and FIG. 1(B) shows the second mode. Figure 2 (C) is a diagram showing the third mode, Figure 2 is a block diagram illustrating the circuit configuration for recording and reproducing in various modes, and Figures 3 (A) and (B) are conventional recording states. FIG.

Claims (1)

[Claims] ■) Recording and playback is performed on a reduced track consisting of reduced zetch formed by dividing the pitch of the basic track into multiple equal parts, and is a delay that records and plays after receiving a playback control signal and delaying by an integer multiple of the reduced pitch. A videotape recorder characterized by being provided with means.