JPS62147882A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To compress and elongate the frequency band of a sound with a simple constitution by providing plural time-base-modifying elements to modify the time base, compress and elongate the band of an input signal, a switching means, and a recording and reproducing means for a time-base-compressed sound signal that includes synchronizing signal. CONSTITUTION:The sound is converted to an electrical signal by a microphone 12, amplified by a pre-amplifier 13, and inputted alternately to first and second time base modifying elements 14 and 15 through a switch S5 and a one S6 that switches at every one H. The signal goes through switches S6 and S7, a pre-amplifier 17, and a switch S1. And in a mixer 4, a synchronizing signal is added to the said signal. The signal, thereafter, is supplied to a magnetic head 8 via an FM modulation circuit 5b and a recording amplifier 7, and a compressed sound signal is recorded on a magnetic disc 9. The operation is sequentially repeated to compress the frequency band of the signal. A reproduced voice signal undergoes a reproduction amplifier 19, a Y-FM demodulator 20a, a switch S9, a preamplifier 23, and switches S5 and S6, to be stored alternately in the time-base-modifying elements 14 and 15. The said signal is outputted at a low speed, amplified by an amplifier 18, and outputted as a sound from a speaker 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a recording/reproducing apparatus for recording and reproducing an audio signal together with a video signal on a recording medium such as a magnetic sheet.

(Prior Art) Conventionally, recording and reproducing devices, such as video disc recorders and video sheet coders, use so-called rotating recording media such as optical discs or magnetic sheets, and record information obtained through a television tuner or video camera. The composite video signal is recorded while forming an annular recording trunk, which is particularly suitable for recording still images.The video signal recorded in this way is played back by a playback device, for example. By connecting a television receiver, it is possible to display still images, and by connecting a printer, it is also possible to create a hard copy of the image, or to transmit it using a facsimile.

By the way, the above-mentioned recording medium is capable of recording a band-compressed audio signal, which is different from the video signal.
Therefore, for example, it is possible to record a band-compressed audio signal on a part of the recording medium, re-expand the audio signal at the time of playback, and play it back together with the related video signal. It is now possible to reproduce still images.

However, conventional recording and reproducing devices require A/D and D/D conversion to compress and expand audio bands, and have the problem of being expensive due to the large number of circuit components.

〔the purpose〕

This invention was made by focusing on the above-mentioned problem.
The purpose of the present invention is to provide a recording/reproducing device capable of compressing and expanding the audio band with a simple circuit configuration without performing D/D/^ conversion, and capable of appropriately reproducing audio and video based on predetermined information.

〔Example〕

Hereinafter, the present invention will be described with reference to an embodiment in which the present invention is applied to a still video recording and reproducing device. However, the citation of the following embodiment is not intended to limit the scope of the present invention, and the present invention is not limited to the above-mentioned patent claims. Changes may be made as appropriate within the range description.

FIG. 1 is a block diagram showing a recording and reproducing system circuit in an embodiment in which the present invention is applied to a still video recording and reproducing apparatus. In the figure, 1 is a CPU that controls the drive of the still video recording and reproducing device, 2 is an image sensor such as a CCD that captures an optical image from an optical system 2a, and 3a is a system that converts a video signal from the image sensor 2 into a luminance signal Y and a chroma signal. 3b is a recording C processing circuit that performs predetermined signal processing on the chroma signal C output from the VC separation circuit 3a; 3C is the luminance signal output from the YC separation circuit 3a; Emphasis circuit that applies emphasis to Y (
[! NP circuit), 4 is a mixer connected to the switching contact side of the switch S1, and 5a is a C-FM modulation circuit connected to the switching contact side of the switch S2, which is connected to the mixer 6a via the subsequent mute circuit 6. has been done. 5b is a Y-FM modulation circuit connected to the switching contact side of the mixer 4, and is connected to the mixer 6a at the subsequent stage. Reference numeral 7 denotes a recording amplifier connected to the output side of the mixer 6a, which is turned on and off by an input gate signal. Reference numeral 8 denotes a single magnetic head as a recording/reproducing means for recording and reproducing signals on a magnetic sheet 9 as a recording medium, and is connected to the switching contact side of the switch S. 10 is an ATP circuit that moves the magnetic heald 8 in the radial direction relative to the magnetic sheet 9 in response to a signal from the CPUI for tracking, 11 is a motor that rotates the magnetic sheet 9, and 11a is a reproduction vertical synchronization signal generation circuit ( Regeneration V generation circuit) Vertical synchronization signal obtained from ttb via switch S4 or CI'U1
A servo circuit that controls the rotational speed and phase of the motor 11 based on a vertical synchronization signal from the servo circuit. Reference numeral 12 denotes a microphone that converts sound into an electrical signal (audio signal), and is connected to a terminal a of a switch S via an amplifier 13. This switch S is further connected to a subsequent switch S through a switching contact. 14 is a terminal of this switch Sh.

a first time axis changing element connected to the switch S;
, a second time axis changing element connected to terminal a of , S,
is a switch connected to the two time axis changing elements 14 and 15, which constitutes a switching means together with the switch S&, and the first time axis changing element 14 is connected to the terminal S.
A second time axis changing element 15 is connected to each terminal a7. Further, this switch S7 is connected to the subsequent switch Ss through a switching contact. Reference numeral 16 denotes an amplifier connected to the terminal a of the switch S8, and its output terminal is the terminal of the switch S1.

It is connected to the. 17 is also the terminal b of switch S8
6 is a speaker connected through an amplifier 18, 19 is a playback device whose input side is connected to the switch/2ch S terminal,
20a is a Y-FM demodulation circuit for FM demodulating the luminance signal Y output from the reproduction amplifier 19, and its output side is connected to the switching contact of the switch S. 20b also converts the chroma signal C output from the reproduction amplifier 19 to F? 1 demodulation circuit, the output side of which is the switch S1.
6 switching contacts. 21a is a de-emphasis circuit (
DEENP circuit), 21b is a dropout compensation circuit, and IH delay line 21 connected to the DEENP circuit 21a.
b, and a switch 21b2, the output of which is input to the mixer 21e at the subsequent stage. 21d is switch S
The reproduced chroma signal processing circuit (regenerated C processing circuit) 21e connected to the switching contact a1° of 1° is a quadrature two-phase modulation circuit connected to the subsequent stage of the reproduced C processing circuit 21d, and its output is connected to the subsequent switch 21f. The signal is input to the mixer 21c via the signal. A monitor 22 reproduces the video signal output from the mixer 21c.

A preamplifier 23 is connected to the switching contact b5 of the switch S, and its output is connected to the switching contact b5 of the switch S. 24 indicates whether the magnetic head 8 is located in a data trunk (to be described later) among the recording tracks of the magnetic sheet 9;
Alternatively, a data track detector outputs a high level signal when positioned on a track designated by a data track designation signal output from CPt1l. 25 is an OR circuit connected to the output of the data track detector 24; Mute circuit 6 and switch 21 depending on the output
f is set to turn on and off. 26 is an AND circuit connected to the data trunk detector 24 and the dropout detector ([1o detector) 26a, and the switch 21b2 is switched in accordance with the output thereof.

S, is a standby button connected to electric fiVcc. Further, the connection state of each of the above-mentioned switches S and -S with each terminal can be changed according to a signal from the CPIII.

FIG. 2 is a diagram showing the magnetic sheet 9 used in this embodiment. In the figure, 9a is a center core provided at the center of the magnetic sheet 9, and has a hole 9b for coupling with the spindle of the motor 11. TI"T31 is an annular recording track on the magnetic sheet 9, for example, tracks T, ~T, etc. In the odd numbered tracks, a video signal containing well-known horizontal and vertical synchronizing signals is recorded in one field per track. FM recording is performed at a ratio of FM.Furthermore, a band-compressed audio signal is recorded in an even numbered 1-rank among tracks T, ~T,.As will be described later, the compressed audio signal is a composite video signal. As in the case of , FM recording is performed with horizontal and vertical synchronization signals superimposed. Also, predetermined information is recorded on the innermost trunk (data track) T32. Namely, 1) Information of each recording trunk Information related to recorded images, such as recording location 1 date and time, environment 5, and other bottle image data.

2) For example, the order of images by a television receiver when reproducing the recorded images of each recording track.

Control information such as time.

3) For example, when playing the recorded video of each recording trunk,
The order in which the printer prints out.

Control information such as number of sheets.

4) Control information for adjusting brightness, color hue, etc. when displaying on a television receiver, printing out on a printer, etc.

5) Information for reproducing the compressed audio signal and the video signal related thereto, such as reproduction control information when continuous audio signals are recorded across multiple tracks, and repeat during audio reproduction.

Information for performing poses, etc.

etc. are recorded.

Note that this data track is not limited to a single track, but may be a plurality of tracks.

Next, the information signal generating circuit A as an information signal generating means for generating the above information will be explained based on FIG.

In the figure, K is a keyboard as an input means, 27
is CPt1, 2B is DMA (mouth 1rect Mem
29 is a RAM for storing data, 30 is a clock generator, 31 is a vertical synchronization signal Vs, a horizontal synchronization signal Hs, and these synchronization signals V
Composite synchronization signal 5YN including s, Hs and equivalent pulses
C1, which will be described later, and a white level signal for AGC are connected to signal lines SL1. SLi.

A synchronizing signal generator (hereinafter referred to as SSC) outputting to SL, SL, and SL, 32 and 33 are mixers, 34
and 35 are parallel-to-serial converters that convert parallel data into serial signals; 36 and 37 are multiplexers; 38 and 39 are switches that are switched every LH (l water period); 40 and 4.
1 is a series-parallel converter that converts a serial signal into parallel data;
42 is a PLL oscillator, 43 is a display, 44 is a synchronous separation circuit, 45 is a decoder, DBl~[184 is a data bus, Ca1-Ca4 are control buses, ABI and 8B2 are address buses, II/Ml and R /A2 is II
This is a read/write control line for AM29.

In the above configuration, when recording a video, a predetermined signal is output from the CPU as a drive control means by operating an operation means (not shown), and a switch 51 is output.
1 S2+ s, the switching contacts are respectively terminals a++ a
Connected to z+as. The optical image from the subject that enters the image element 2 via the optical system 2a is converted into an electrical signal (video signal) by the image element 2 and is supplied to the YC separation circuit 3a. This video signal passes through a YC separation circuit 3a that separates the luminance signal Y and chroma signal C, and the luminance signal Y is sent to an emphasis circuit (EMP circuit>
3b, switch S mixer 4 and Y-PM modulation circuit 5b
Also, the chroma signal C is sent to the recording C processing circuit 3b, the switch S2, the C-FM modulation circuit 5a, and the mute circuit 6.
are applied to the mixer 6a, where they are mixed. The output of this mute path 6a is the recording amplifier 7.
The recording tracks T1 to T1 on the magnetic sheet 9, which is amplified by the magnetic sheet 9 and is then applied to the magnetic head 8 via the switch S, are rotated by the motor 11 through the head 8.
B of 1 track-l field in any one of T311
It will be recorded as follows. Here, at this time, the servo circuit 11a is connected to the regeneration generating circuit 11 through the switch S4.
Although not shown in FIG. 1, the vertical synchronizing signal Vs from the P obtained from the PG generating means that generates the signal
G times signal is input, and based on these, the magnetic sheet 9 is in a predetermined phase with respect to the vertical synchronizing signal Vs and at 3,600 r.
The motor 11 is servo-controlled to rotate at a constant speed at pa+.

On the other hand, when reproducing the recorded signal, the servo circuit 11a
is a synchronization signal V's equivalent to the vertical synchronization signal Vs from the reproduction vertical synchronization oscillator 11b obtained through the switch S4.
and the PC signal mentioned above, and based on these,
As in the case of recording, the motor 11 is servo-controlled so that the magnetic sheet 9 rotates at a constant speed of 3,600 rpm at a predetermined phase with respect to the synchronization signal V's.

At this time, the recording signal pick-amplified through the magnetic head 8 is amplified by a reproduction amplifier 19 having an AGC circuit. The output of this reproduction amplifier 19 is sent to the TF circuit 10 for head tracking. The signal is input to a drop-out detector 26a, an FM demodulator 20a that demodulates a luminance signal Y including a synchronization signal, and a demodulator 20b that demodulates a chroma signal C. The demodulated luminance signal Y from the Y-FM demodulator 20a is sent to the mixer 21 via a de-emphasis circuit (DEENP circuit) 21a and a DO compensation circuit 21b.
input to c. On the other hand, the chroma signal C from the C-FM demodulator 20b is input to the mixer 21c via a reproduction C processing circuit 21d, a quadrature two-phase modulation circuit 21e, and a switch 21f, where it is mixed with a luminance signal Y including a synchronization signal. and output to the monitor 22. Here, during playback, the playback brightness signal Y
When a drop out of the DO detector 26a is detected, the DO detector 26a
The output of the AND circuit 26 goes high, for example, due to the output from the DO compensation circuit 21b.
1bt is switched from the main line side to the IH delay NlA21 b + side, and the signal before LH (1 horizontal scanning period) is transferred to the mixer 21
DO compensation of the luminance signal Y is performed by inputting it to c.

The above is the operation when recording and reproducing a color video signal, but in the case of a monochrome video signal, recording and reproducing the chroma signal C is not necessary, so a monochrome selection signal is inputted from the control terminal 25a. As a result, the recording system mute circuit 6 operates through the OR circuit 25, and recording of the chroma signal C is prohibited, while the reproduction system switch 21f is opened and the input of the chroma signal C to the mixer 21c is disabled. This makes it impossible to record and reproduce the chroma signal C including the subcarrier.

Next, when recording audio, the ATF circuit 10 moves the magnetic head 8 to a new trunk, and switches S, S3 . SS+ s, is terminal 111++ a
3+as+a, respectively. After the sound to be recorded is converted into an electrical signal by the microphone 12, it is amplified by the preamplifier 13, and then sent to the first and second time axis changing element 1
4.15 are input alternately. This time axis changing element 14
．． 15 consists of, for example, an HCCD delay line, etc., and recording is performed during each effective horizontal scanning period, and normally the capacity for LH when audio signals are sampled at a frequency of about 14 and 12, that is, about 780 bits. It has a capacity of Further, the time axis changing elements 14 and 15 are driven in accordance with the drive pulse.

This drive pulse varies depending on the number of drive phases of the time axis changing element 14.15, but in this case, the drive pulse φ
1. ．． φlb+ φ21. It shall be represented by φ21.

Here, if switch S is initially connected to terminal S, then preamplifier 13 and switch S.

The audio signal sent out via the drive pulse φ3. is input to the first time axis changing element 14, which is driven according to the time axis. At this time, drive pulse φ3. As described above, a frequency of about 1/1000 of the sampling frequency of, for example, 14 KHz, which sets the capacitance of each time axis changing element 14, 15, is used, that is, about 14 kHz. As a result, assuming that the capacity of the first time axis changing element 14 is 780 bits, an audio signal of about 55 m5ec will be accumulated in the first time axis changing element 14. Note that at this time, switch S is connected to terminal a. When the storage in the first time axis changing element 14 is completed, the switches Sh and St switch to terminals a&+b?, respectively, in response to a switching signal from the CPUI. Switch to connection with
Audio signals are similarly accumulated in the second time axis changing element 15. That is, the driving pulse φ5. The drive pulse φ2. has the same frequency (14KHz) as the drive pulse φ2. The audio signal sampled in step 1 is stored in the second time axis changing element 15. Also, during the storage operation in the second time axis changing element 15, the audio signal accumulated in the first time axis changing element 14 is transferred to the driving pulse φ1. The drive pulse φ1. has a frequency (14Mtlz) that is about too times as large as can be read out at high speed.

Then, the audio signal read out from the first time axis changing element 14 is sent to the preamplifier 1 from the switches S, , S.
6 and switch S1 to the mixer 4, where the synchronizing signal 5YNC sent from cpυ1 is added, and then supplied to the magnetic head 8 via the FM modulation circuit 5b and the recording amplifier 7, where it is output to the magnetic disk 9. recorded above. In this case, on the magnetic disk 9, for example, as shown in FIG. 3, a compressed audio signal of 11-1 minutes is recorded only in the recording area Tll of the track T1. At this time,
The recording amplifier 7 is not ONL in areas other than the recording area T11. This is done by a gate signal. On the other hand, the second time axis changing element 15 is accumulating audio signals during this period, and when this accumulation operation is completed (after switching the connection of switch S to terminal a6),
5a+sec has passed. ) Switch S, the terminal B &
Connect to.

Then, a drive pulse φ having a frequency of 14 KHz is supplied to the first time axis changing element 14 from the CPUI. Further, the audio signal of, for example, about 55 m5ec accumulated in the second time axis changing element 15 is read out at a high speed as in the case of the first time axis changing element 14 described above, but the timing is different from the above-mentioned recording. Area T next to area Tll
The timing is such that it is recorded at 1□ (see Figure 2). At this time, after recording to the recording area T, is completed, the next recording area T,! For example, it takes 5 minutes before recording starts.
Approximately 5m5ec has passed, and during this time the magnetic disk has rotated several times (in this case, approximately 4 rotations).

By repeating the above operations sequentially, it will take about 14 seconds (5 seconds).
An audio signal of 5m3ec x 2408) is band-compressed and recorded on one track.

Furthermore, if the audio signal to be recorded is for a long time, in this case 14 seconds or more, it is possible to record it over a plurality of adjacent tracks, for example. In this case, the magnetic head 8 is moved in the radial direction by the TF circuit 10, but while this movement is being performed, the output timing from each time axis changing element 14, 15 is delayed, so that continuous Recording of audio signals becomes possible.

When reproducing an audio signal from the magnetic disk 9, first connect the switch "-""5STSI+"' to the terminal b3.
The connection is switched to +t14+ bs and b8+ bq, and the magnetic head 8 moves to a predetermined track. Then, the reproduced audio signal is sent to the first time axis changing element 14 via the reproduction amplifier 19, the Y-FM demodulator 20a1 switch S9, the preamplifier 23, and the two switches Ss and Sh, and is sent to the first time axis changing element 14, for example, at about 14 KHz. It is sampled and accumulated with a drive pulse φ having a frequency. When this accumulation operation is completed, switches S, S, are switched to connection with terminals a & + b, and the IH worth of audio signals reproduced by the magnetic head 8 are accumulated from the second time axis changing element 15. Ru. Also, during this accumulation operation, the compressed audio signal for IH multiplied by N in the first time axis changing element 15 is 14
K It z drive pulse φ1. is output at low speed and becomes an audio signal of 55 Ilsec, which is output by amplifier 1.
After being amplified in step 8, the signal is output as audio from speaker 17. In addition, the magnetic disk rotates under the magnetic disk 8 three to four times until all the IH audio signals are output, and during this time the next IH audio signal is extracted. It is stored in the second time axis changing element 15. Then, when all the audio signals for IH are output from the first time axis changing element 14, the switch S&+s? are respectively terminals bb.

The connection is switched to a7, and the stored audio signal is read out from the second time axis changing element 15. As a result, the 2H audio signal is continuously output from the speaker 17 without causing any unnaturalness. Also, during this time, the compressed audio signal for IH is accumulated in the first time axis changing element 14, and by repeating the above operation, for example, 14 seconds worth of audio can be reproduced by the speaker 17.

Further, the audio signal reproduced by the above embodiment is added with noise of, for example, 55 Ilsec, and has a noise of about 20 If
Z buzz may occur, but this buzz can be avoided by providing a pre-hold at the front stage of the FM signal to sample and hold the final value of the IH audio signal to enable smooth audio demodulation. can be easily reduced by

Next, the operation of the circuit shown in the third diagram will be explained with reference to the flowchart of FIG.

First, when creating the original keyboard K, the CPt127 changes the read/write control line R/Wl to W in response to a control signal input via the control bus Cn4.
(write) and then sends the information provided by the keyboard via the data bus DBI to the RA? +29 to be sequentially transferred and written. Since this operation is well known, detailed explanation will be omitted.

When the data input is completed and the record start button is pressed on the keyboard, the control bus C
In response to the recording start signal given from B4, CPt12
7 detects whether or not the power of the recording/reproducing system circuit shown in FIG. When it is on, the recording mode (1) outputs to the recording/reproducing device via the control bus CBI, moves the head to the data track position, starts the sheet rotation motor, and starts other recording circuits. At the same time, the 5SG31 is set to recording mode, and the clock signal from the clock generator 30 of the 5SG31 generates the aforementioned composite synchronization signal, vertical and horizontal synchronization signals V,
s and IIs, a pre-V signal indicating 7H before the vertical synchronization signal, and a white level signal. Then, the CPU 27 waits for a signal indicating servo lock of the sheet rotation motor 11 on the recording/reproducing device side to be input via the control bus CBI. During this time, the composite synchronization signal and white level signal from the 5SG31 are applied to the recording/reproducing circuit side via mixers 32 and 33, and the recording/reproducing circuit side uses the input signal at this time for vertical synchronization as described later. The signal is separated and servo control of the seat rotation motor 11 is performed based on the signal. Then, when the servo lock is applied and a signal indicating this is input to the CPt127 via the control bus CHI, the CPO27 receives the aforementioned pre-V signal from the 5SG31.
The signal is detected and a gate signal for turning on the recording gate in the recording amplifier 7 in the recording system of the recording/reproducing circuit is outputted through the control bus Cal. At the same time, an operation request is output to the DMA controller 28 via the control bus CB2.

When the QM controller 28 receives an operation request from the CI'lJ2'7, it sends R (read) via the read/write control line R/W2. Then, data of 80 bits each is outputted to the multiplexer 36 in accordance with the vertical and horizontal synchronizing signals Vs and Its from the 5SG31. Also, D
The IIIA controller 28 alternately switches the output terminal of the multiplexer 36 and the switch 38 through the signal line SL6, and alternately switches the reading and writing of the parallel to serial converters 34 and 35. Incidentally, a shift pulse is applied to the parallel/direction converter 1a 34, 35 from the DMA controller 28 via the signal line SL7. Therefore, converter 34 receives data.
Data is read from the parallel-to-serial converter 35 while data is being written, and therefore data is written to the parallel-to-serial converter 35 while data is being read from the parallel-to-serial converter 34. You can get the desired action.

When the CPU 27 detects through the control bus CB3 that the DMA operation of the DMA controller 28 has ended, the CPU 27 detects the next pre-V signal and sends a gate signal to the recording amplifier of the recording/reproducing device over 1v (one vertical period). The output is cut off, and the end of information recording is displayed on the display 43.

The bit arrangement of the composite information signal recorded on the data track of the magnetic sheet 9 by the above operation is as shown in FIG. 6.7. Here, FIG. 6 shows the bit arrangement in lv, and FIG. 7 shows the bit arrangement in IH. Fourth
As shown in the figure, at 1■, vertical synchronization signal area 130
After the equivalent pulse area 132 that follows this, a white level area 134 two times higher is provided, followed by a data area 136. Data area 136
is followed by a no-signal area 138 and finally by an equivalent pulse area 140. As mentioned above, the white level signal in the white level area is for AGC of the recording signal.

Further, as shown in FIG. 7, a well-known data synchronization signal Ds is recorded after the horizontal synchronization signal 115', and 80 bits of data are recorded in the subsequent data area 136a.

The data synchronization signal Os is added by the RAM 29.

Next, the processing and storage operations during reproduction of the composite data signal recorded on the sheet 9 as described above will be explained with reference to FIG.

When the data playback key is pressed, after checking the power status of the recording and playback circuit, the recording and playback circuit is set to playback mode and the motor 11
is in the operating state, and the head 8 is connected to the data trunk T.
Move to 12. Also, set the 5SG31 to playback mode,
The 5SG31 is reset by the reproduced synchronization signals V's and H's obtained by the synchronization separation circuit 44, and is operated by the output clock of the PLL oscillator 42 whose phase is controlled by the synchronization signal bit of the reproduced information signal. Therefore, when playing 5SG3
1, a synchronization signal completely locked to the phase of the reproduced signal can be obtained.

After obtaining the servo ripple signal from the servo circuit 12, a DMA operation request is output to the controller 28 using the first pre-V signal.

[IMA controller 28 sets signal line R/W2 to W and puts RAM 29 in write mode. And 5SG
Data writing is started in synchronization with the synchronization signals V's and H's from 31. The DMA controller 28 is operated by the output synchronization signal of the 5SG 31 and the output clock of the PLL oscillator 42 in the same way as when recording data, and is operated by the write/continue mode switching pulses of the multiplexer 36, switch 39, direct spinning converter 40 and 41. , generate shift pulses for this transducer 40,41.

Therefore, the reproduced composite data signal input to the input terminal 47 has the composite synchronization signal removed by the decoder 45, and is then input to the direct spinning converter 40, 41 in IH alternation.

Then, parallel data is outputted from the direct spinning converters 40 and 41 alternately for each IH and written into the llAM 29. When the DMA operation is completed, the CPt 127 detects it and displays it on the display 43. After that, the CPt 127
performs data processing such as error correction and ends the operation.

Next, recording and reproduction of data signals will be explained.

First, when recording, the data signal output terminal 46 in FIG.
A data signal (hereinafter referred to as a composite data signal) containing a synchronization signal (V s + If s + equivalent pulse) output to
is input to the YC separation circuit 3a as in the case of the video signal. At this time, the head 8 moves to a predetermined data track T on the magnetic sheet 9. 2 or a track designated by the data trunk designation signal output from the CPUI in FIG. 2, the output of the data track detector 24 goes high. As a result, as in the case of recording the black-and-white video signal described above, the mute circuit 6 becomes operational, and recording of the chroma signal C including the subcarrier is prohibited. In this state, the aforementioned composite data signal inputted to the UNP circuit 3c from the terminal 46 is recorded on the data track 732 on the sheet 9 by the head 8 in the same manner as the luminance signal Y including the synchronizing signal. That is, it is recorded with emphasis and FM modulation. At this time, as mentioned above, before the composite data signal is output, the vertical synchronization signal Vs from 5SG31 in FIG.
The servo circuit 11a drives a motor to rotate the magnetic sheet 9 at a constant speed of 3.60 Orpm at a predetermined phase with respect to the vertical synchronization signal Vs based on the vertical synchronization signal Vs and the PG double signal. 11 is servo controlled. In addition, when recording this data signal, the CPU
for 1v (1 vertical time) for recording under the control of
For example, when the recording gate in the recording amplifier 7 is turned on and the aforementioned composite data signal is applied to the input terminal 3 in synchronization with this, the data signal is transferred to the sheet 9.
This is recorded on the first track above.

Next, when reproducing the composite data signal recorded in this way, the switch S4 is connected to the reproduction vertical synchronization oscillator 12a side, and the servo circuit 1
2 is based on the synchronization signal V's and the PG double signal, and the sheet 9 is set at a predetermined phase with respect to the synchronization signal V's and at 3.60 Orp.
The motor 11 is servo-controlled to rotate at a constant speed of m. At this time, the composite data signal that is amplified by the head 8 is transmitted to a reproducing amplifier 19 having an AGC circuit.
After being amplified by the ATF circuit 10, the DO detector 26a
It is attached to SY-FM demodulators 20a and 20b. Here, the TF circuit 10 operates in the same way as when reproducing a video signal to track the magnetic head 8, but on the other hand, the output of the DO detector 26a is high while the output of the data trunk detector 24 is high. Therefore, the DO compensation circuit 21b becomes inactive and its switch 21b2 remains connected to the main line. Furthermore, at this time, the high output from the OR circuit 25 causes the switch 21f connected to the output of the quadrature two-phase modulation circuit 21e to
Therefore, as in the case of reproducing a black and white video signal,
The input of the output of the quadrature two-phase modulation circuit 21e to the mixer 21c is now prohibited, and as a result, even the subcarrier for the chroma signal C is no longer input to the mixer 21c.

In this state, the composite information signal demodulated by the Y-FM demodulator 20a is sent to the de-emphasis circuit 21a,
The signal is outputted to the signal generation circuit A shown in FIG. 3 via the switch 21f in the DO compensation circuit 21b and the mixer 21c. This makes it possible to prevent disturbances in the reproduced information signal due to 00 compensation and the inclusion of the chroma signal C subcarrier.

Next, an example of FM modulation of the composite information signal will be explained using FIG.

In the figure, 300 is a high level information signal.

The sync chip level Ll of the horizontal synchronization signal Hs is, for example, 6 old 1z, and the pedestal level L2 is, for example, 6.5M.
IIz.

The high level L3 of the information signal 300 is, for example, 7 old lz
(equivalent to 50% white level), and the white peak level L4 of the video signal is set to, for example, 7.5 old lz. In particular, it is preferable that the high level L3 of the information signal 300 is set between the pedestal level L2 and the white peak level L4 of the video signal. This is the information signal 300
If the high level L3 is about white peak level 4, the emphasis circuit 3a provided in the recording system in Fig. 1 will emphasize the high level and cause phenomena such as inversion, which will prevent accurate data recording. This is because it becomes impossible. Therefore, as described above, by setting the high level L3 of the information signal 122 to an intermediate level, for example, equivalent to the 50% white level, data can be recorded while keeping the emphasis circuit 52 active.
It is also easy to distinguish between the low level of

Since the video synchronization signal is added to the data signal, as described above, according to this embodiment, the main part of the video signal recording and reproducing system can be used for recording and reproducing the data signal. By operating the chroma signal mute circuit used when recording black and white video signals also for recording information signals, the chroma signal subcarrier that is harmful to data recording is removed.
) can be done. In addition, when reproducing information signals, as in the case of reproducing black and white video signals, by cutting off the human power to the mixer from the quadrature two-phase modulation circuit for chroma signals, the chroma signal becomes harmful to the reproduced information signal. It is possible to cut the used subcarrier. In this way, accurate recording and reproduction of information signals becomes possible.

In addition, in the above embodiment, two time axis changing elements 1
Although the case where 4.15 is used is shown, it is also possible to use two or more time axis changing elements.

In addition, although recording and reproduction were performed while switching between images and audio using a single magnetic head 8, it is also possible to record and reproduce images and audio using separate magnetic heads and circuits. .

Furthermore, in the above embodiment, not only the video captured by the imaging element and the audio signal input from the microphone can be recorded and reproduced, but also the video and audio signals sent from external sources such as a television receiver, VTR, and video disk can be recorded and reproduced. It can also be applied to

〔effect〕

As explained above, according to the present invention, it is possible to record and play back audio by compressing and expanding the band without performing A/D and D/A conversion, which were essential for conventional devices. At the same time, it has the effect of significantly reducing the number of parts and lowering costs, and is based on recorded playback information.

This has the effect that audio and video can be played back properly.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a recording/reproducing circuit according to an embodiment of the present invention, FIG. 2 is an explanatory plan view showing the configuration of a magnetic sheet used in the device shown in FIG. 1, and FIG. A block diagram showing the information signal generation means in one embodiment, FIG. 4 is a flowchart showing the information signal generation operation of the one shown in FIG. 3, and FIG. 5 is a flowchart showing the information reproduction operation of the one shown in FIG. 3. 6 and 7 are diagrams showing the bit arrangement of the composite information signal recorded on the data track of the magnetic sheet, FIG. 6 shows the bit arrangement within one vertical period, and FIG. 7 shows the bit arrangement within one horizontal period. shows the bit array of FIG. 8 is a diagram showing a composite information signal. 4...Mixer, 8...Magnetism as a recording and reproducing means7), 14...
First time axis changing element, 15... Second time axis changing element, Sh, S,... Switch as switching means, K...
・Keyboard as a human power means, A... Information signal generation means. Figure 2 Figure 4 Figure 6 Figure 7 Figure 81N 1Hj

Claims (3)

[Claims] (1) A plurality of time axis changing elements that perform band compression and expansion by changing the time axis of an input signal, a switching means that selectively switches input and output of audio signals to each time axis changing element, and a composite video image. means for superimposing a synchronization signal similar to that contained in the signal and a band-compressed audio signal; information signal generation means for generating predetermined information according to the input means; and band compression including the composite video signal and the synchronization signal. What is claimed is: 1. A recording and reproducing device comprising a recording and reproducing means for recording and reproducing the audio signal and the information. (2) The recording and reproducing apparatus according to claim 1, characterized in that it includes two time axis changing elements. (3) The recording and reproducing apparatus according to claim 1 or 2, wherein the time axis changing element is composed of a CCD.