JPS63283286A - Time lapse type magnetic recording device - Google Patents

Abstract

PURPOSE:To record continuous sound having no interruption by recording a time- compressed sound signal obtained by time-compressing a sound signal corresponding to time longer than nT in an input sound signal every period nT corresponding to n (n is a prescribed natural number) times a prescribed period T in an additional oblique track formed between adjacent oblique tracks. CONSTITUTION:A time compressing circuit 11 generates a time-compressed sound signal from an input sound signal, its generating period is n (natural number) times the sampling period T of a video signal and the input sound signal corresponding to time longer than the period nT is compressed at its time. The time-compressed sound signal is inputted to a gate circuit 14 through an FM modulating circuit 13. The period of a gate control signal (ga) supplied to the gate circuit 14 is equal to that of a gate control signal (gv) to conduct the gate circuit 14 for one field period. Consequently, the compressed sound signal is recorded by a head 16 at the same period as a video signal. The recording is delayed from the record of the video signal in a stop period of the magnetic tape 17. Consequently, sound tracks 161-164 are formed against video signal tracks 901-904. Since the sound information has superposed parts between the adjacent tracks, a continuous reproduced sound signal having no interruption can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time-lapse magnetic recording device that samples a field video signal from an input video signal at predetermined intervals and records it on a magnetic tape.

[Conventional technology]

The time-lapse magnetic recording device is disclosed in the published patent publication 1983.
Long-term recording is achieved by running the magnetic tape intermittently as described in Japanese Patent No. 62985. However, because the magnetic tape ran intermittently, it was not possible to record audio.

[Problem that the invention seeks to solve]

In the above conventional technology, since the magnetic tape runs intermittently,
Continuous audio recording to linear tracks is not possible. Therefore, conventionally, audio recording was not performed.

An object of the present invention is to provide a time-lapse magnetic recording device that can record uninterrupted audio.

[Means for solving problems]

The present invention is characterized in that a time-compressed audio signal is generated from an input audio signal, the generation period is a predetermined natural number multiple of the sampling period of the video signal, and the content of the time-compressed audio signal is for a period longer than the generation period. for each of the predetermined natural number of video signal tracks,
An additional recording means is provided for recording the time-compressed audio signal by forming an additional diagonal track between a video signal track and an adjacent video signal track.

[Effect]

The time compression means time compresses the input audio signal, and the additional recording means records the time compressed input audio signal onto a magnetic tape. As a result, all information of the input audio signal is recorded onto the magnetic tape.

The time-compressed audio signal generated by the time-compressing means is a time-compressed version of the input audio signal for a time longer than the generation cycle, so the audio information recorded on the magnetic tape includes overlapping parts between adjacent tracks. have.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The signal input from the video input terminal 1 is sent to the Y/C separation circuit 2. Emphasis circuit 3. FM modulation circuit 41 frequency conversion circuit 5. The signal passes through a video signal processing circuit composed of an adder 6, and then passes through a gate circuit 7. The signal is supplied to circuit magnetic heads 9 and 9 via a recording amplifier 8. On the other hand, audio input terminal 1
Signal Fi input from 0, time compression circuit 11. Emphasis circuit 12° PM modulation circuit 13. Gate circuit 14. The signal is supplied to a rotary magnetic head 16 via a recording intensifier 15. The rotating magnetic heads 9, 9 and 16 are connected to the magnetic tape 17.
It is in sliding contact with the The luminance signal Y of the Y/C branch circuit 2 is supplied to the V sync separation circuit 18,
The output of the SynC separation circuit 18 is input to the system control circuit 19. System control circuit 1
9Lt, gate circuits 7, 14. A control signal is supplied to the time compression control circuit 20 and the motor drive circuit 21. The time compression control circuit 20 supplies a control signal to the time compression circuit 11. The motor drive circuit 21 includes a capstan motor 22 that runs the magnetic tape 17.
to drive.

FIG. 2a) shows the rotating cylinder 23 to which the rotating magnetic heads 9, 9 and 16 are attached, viewed from above.
b) is a sketch when viewed from the side. The rotating magnetic head 16 is attached to the rotating magnetic heads 9 and 9 with a step d in the direction of the rotation axis. The rotating magnetic heads 9 and '9 have the same azimuth, and the rotating magnetic heads 16
is the opposite azimuth to this.

FIG. 5 is a diagram of track buttons on the magnetic tape 17.

901, 902, 905, and 904 are video signal tracks, and 161, 162, 163, and 164 are compressed audio tracks.

FIG. 4 is a detailed block diagram of the time compression circuit 11.

The signal input from the audio input terminal 10 is passed through a low-pass filter 24. The signal is inputted to gate circuits 26 and 26 via a system/D converter 25. The output of the gate circuit 26 is supplied to the data input/output terminal of the first memory 27 and the switching circuit 28, and the output of the gate circuit 26 is supplied to the input/output terminal of the second memory 27 and the switching circuit 28. The output of the switching circuit 28 is sent to a D/A converter 29. After passing through the low-pass filter 30,
It is output to the time compressed audio output terminal 31. A control signal is supplied to the time compression control circuit 20 switching circuit 28.

Next, the operation of this embodiment will be explained. A timing diagram of the control signals is shown in FIG.

The input video signal is separated into a luminance signal Y and a color signal C by a Y/C separation circuit 2, and the luminance signal Y has its high frequency emphasized by an emphasis circuit 3, and then FM modulated by an IPMFM modulation circuit, and then sent to a frequency conversion circuit. The color signal converted into a low frequency signal by 5 is added by an adder 6, and the result is input to a gate circuit 7. On the other hand, the V 8 ynC separation circuit 18 separates the vertical synchronization signal v s yn from the luminance signal Y.
c is separated and input to the system control circuit 19. The system control circuit 19 counts V sync and sends a control signal to the gate circuit 7 and motor drive circuit 21 at every predetermined count value. A gate control signal gv is sent to the gate circuit 7 to make the gate conductive for one field period as shown in FIG. 5b).

As a result, one field of video signals is sampled at regular intervals and recorded on the magnetic chip 1 by the rotating magnetic heads 9 and 9.

A motor drive control signal m is sent to the motor drive circuit 21 to cause the magnetic tape 17 to travel a predetermined distance W as shown in FIG. 5a). The transmission of the gate control signal gv and the transmission of the motor drive control signal m are performed using the magnetic tape 1.
7 is stopped, the recording is performed at different times. As a result, video tracks such as 901°902.905.904 are formed on the magnetic tape 17.

On the other hand, the input audio signal is time-compressed by a time compression circuit 11 , high frequencies are emphasized by an emphasis circuit 12 , and then FM modulated by an FM modulation circuit 13 and input to a gate circuit 14 . The gate control signal gaFi supplied to the gate circuit 14 is as shown in FIG. 5d), and is generated by the time compression control circuit 20. The gate control signal ga is input from the system control circuit 19) f! I control signal gv and FIG.
) Signal 5w3 synchronized with the rotation of the rotating cylinder 23
0, the period is equal to the gate control signal gv,
The rotating magnetic head 216 passes over the magnetic tape 17 1
The gate circuit 14 is made conductive during the period of the field. As a result, the time-compressed audio signal is recorded on the magnetic chip 1 by the rotating magnetic head 16 at the same period as the video signal.

The time-compressed audio is recorded later than the video signal while the magnetic tape 17 is stopped.

As a result of the above, 161°162.1
Time compressed audio tracks such as 65 and 164 are formed, and the track pattern shown in FIG. 5 is eventually formed.

The time compression circuit 11 generates a time compressed audio signal in synchronization with the gate control signal ga. The operation timing diagram is shown in FIG.

The input audio signal is band-limited by a low-pass filter 24, then converted into a digital signal by an A/D converter 25, and supplied to a first memory 27 and a second memory 27 through gate circuits 26 and 26, respectively. Ru.

The time compression control circuit 20 receives the memory control signal g1
and address ad1 to the first memory 27. The memory control signal g1 is as shown in FIG. 6b), and the first memory 27 is in a write mode when this signal is at a high level, and is in a read mode when this signal is at a low level. The memory control signal g1 is also given to the gate circuit 26,
During the period when the first memory 27 is reading, A/
What is the output data of the D converter 25? In memory 27 of A1.
prevent it from being supplied. The address ad+ is counted up slowly while the memory control signal g1 is at a high level, and at a high speed while it is at a low level, and returns to 0 when it counts up to the maximum value, as shown in Figure 6C). . As a result, the data d1 at the data input/output terminal of the first memory 27 is the time-compressed version of the input data of the period AO, and the time-compressed version of the input data of A2, as shown in FIG. 6d). what appears in al.

On the other hand, the gate circuit 26 and the second memory 27 are supplied with the memory control signal g2 and address ad2 shown in e) and f) of FIG. As for the data da at the input/output terminal, as shown in FIG. 6g), the time-compressed input data of the period At appears in al, and the time-compressed data of M1 appears in ai. These data d1 and dx are switched by the switching control signal S shown in FIG. 6h) in the switching circuit 28, resulting in the output data d out shown in i). Output data dout ij,
It is converted into an analog signal by the D/A converter 29,
The signal is band-limited by the low-pass filter 50 and output from the time-compressed audio output terminal 1. As described above, a time compression signal is output in synchronization with the gate control signal ga.

At this time, when the period of the gate control signal qa is T and the pulse width is tw, by setting the speed ratio β of high-speed count-up and slow count-up at addresses ad1 and adz as 7>T/1w, As shown in FIG. 6, the content of the time-compressed audio signal that is generated at one time is the input audio signal for a period longer than the generation period. Hence the time compressed audio tracks 161 , 162 , 163 .

The information recorded in 164 has an overlapping portion between adjacent tracks.

As described above, according to this embodiment, a continuous audio signal can be recorded in an apparatus that runs a magnetic tape intermittently and samples and records a field video signal from a long sword video signal.

Furthermore, since the information at the boundary between one time-compressed audio signal and the next time-compressed audio is recorded redundantly, instability of the circuit or mechanism during playback may cause the difference between one time-compressed audio signal and the next time-compressed audio. Even if there is a shift in the connection between the signals, it is possible to obtain stable and uninterrupted audio playback.

In the embodiment described above, the 5-hour compression circuit 11 may be constructed using a dealbort memory 52 as shown in FIG. The output di of the A/D converter 25 is input to the data input terminal of the digital port memory 32, and the output do of the digital port memory 32 is input to the D/A converter 29. The operation timing in this case is shown in FIG.

The time compression control circuit 20 uses write address ad.
i and the read address ad are supplied to the dealboard memory 32. The write address adi is Fig. 8b)
The read address ado is counted up at a low speed as shown by the broken line in FIG. The value of the read address ado is set to the same value as the write address mdi at the rising edge of the gate control signal ga. The read address ado may be arbitrary in a section not shown.

Default port memory 52fi, write address ad
Write input data di to the address specified by i,
Data is read from the address specified by the read address ado and is used as output data do.

Therefore, an of the output data input terminal shown in FIG. 8d)
, aj, at, and am are Ao, A+, At of the input data di shown in FIG. 8C), respectively.
, the data for the AI period is time-compressed.

In this embodiment as well, the ratio of the count-up speed of the write address adi and the read address ado -β! >T/lW, the time compressed audio track 161°16
The information recorded in tracks 2, 163, and 164 has overlapping parts between adjacent tracks.

In the embodiments described above, the periods of the gate control signals gv and ga are equal, but the period of the gate control signal ga may be a natural number multiple of the gate control signal gv.

FIG. 9 shows the time relationship between the motor drive control signal m, the gate control signal gv, and the gate control signal ga in the case of twice the amount. A track button diagram in this case is shown in FIG. A time-compressed audio track is formed for every two video tracks, such as 161' and 162'.

When the period of the gate control signal ga is made twice the period of the gate control signal gv as described above, as shown in FIG. A head 9'' may be provided, and the rotating magnetic heads 9 and 9 may be used alternately to form an image line track. A track button diagram in this case is shown in FIG. 11. Image tracks 901 and 903 formed by the rotating magnetic head 9 and image tracks 902 and 904 formed by the rotating magnetic head 9 are alternately formed. By doing this, It is compatible with a magnetic recording device using a normal guard panless azimuth recording method.When the track pattern shown in FIG. 11 is reproduced by running the magnetic tape 17 intermittently, Rotating magnetic heads 9 and 9
However, since video tracks 901 and 903 can only be reproduced by the rotating magnetic head 9, still reproduction is not possible. Therefore, when restarting, it is not possible to run the magnetic chip 1F 0 at the playback position of video tracks 901 and 903', so the audio information is
As shown in FIG. 1, it is convenient for all the audio signals to be stored in the positions of time-compressed audio tracks 161 and 162.

〔Effect of the invention〕

As described above, according to the present invention, audio recording can be performed in a time-lapse magnetic recording device.

Furthermore, when playing back audio recorded according to the present invention, even if there is instability in the circuit or mechanism, since adjacent tracks have overlapping parts, it is possible to obtain uninterrupted and stable reproduced audio. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the configuration of an embodiment of the present invention, Fig. 2 is a sketch of a rotating cylinder, Fig. 3 is a track button diagram, Fig. 4 is a detailed block diagram of a time compression circuit, and Fig. 5 is a detailed block diagram of a time compression circuit. 6 is an operation timing diagram of the circuit shown in FIG. 4. FIG. 7 is a detailed block diagram of the time compression circuit of another embodiment. FIG. 8 is an operation timing diagram of the circuit shown in FIG. 9. is a system operation timing diagram of another embodiment, No. 10
FIG. 11 is a track button diagram of another embodiment, and FIG. 12 is a sketch of a rotating cylinder of another embodiment. 7.14... Gate circuit, 9 , 9 , 9 , 16... Rotating magnetic head, tail/country 2nd height prisoner Δ 2g' 5th C) S ni θ] engineering [-1 1-----------"]"1"1
Ding t "d) 7th order 6th circle 7th circle h Z 8th evil man? Eye 1st Orn

Claims (1)

[Claims] A time-lapse magnetic recording device comprising a sampling means for sampling a field video signal from an input video signal at predetermined intervals T, and a recording means for recording the sampled field video signal by forming diagonal tracks on a magnetic tape. , a time compression means for generating a time-compressed audio signal by time-compressing an audio signal for a time longer than nT in the input audio signal every period nT that is a predetermined natural number n times the predetermined period T; and an additional recording means for recording the time compressed audio signal by forming additional diagonal tracks every predetermined natural number n between the diagonal tracks, and sequentially forming the diagonal tracks and the additional diagonal tracks. A time-lapse magnetic recording device.