JPS61903A - magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain reproduced sound signals endlessly by reversing the direction of running of a tape at the time of recording sound signals by a rotary head to the direction of running of the tape when recording sound signals by a fixed head. CONSTITUTION:When recording ordinary sound signals, sound signals inputted from a sound inputting terminal 11 are inputted to an input amplifier 12 through D side of an SW3. Then, the signals are modulated by a frequency modulator 13 and amplified by a recording amplifier 14 and recorded in the track 5 of a tape 1 by rotary heads 15, 21 for voice recording through R side of SW4 and SW5. At the time of reverse recording, an SW1 is made on state, and the output SW3 from output terminals 29, 30 of a sequential controlling circuit 28 is connected to C side and an SW7 is connected to an F side. Signals inputted to the voice inputting terminal 11 are mixed with output of a bias oscillator 54 by a mixer 55 through a record equalizing amplifier 52, and a recording amplifier 53, and recorded in the track 3 of the tape 1 by a fixed head 56 through R side of SW12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of Industry-1- The present invention relates to continuous reproduction of audio signals in a magnetic recording/reproducing device (hereinafter referred to as VTR 1).

Conventional configurations and their problems In recent V'1-Rs, the area for recording audio signals on a rotary head of 1°M is greater than the tape area for recording via A signals, such as the 6-type, and 8 mm video A. More than enough shillings 1. The J8 method of recording PCM on the areas where a large amount of heat is applied has been proposed, and the playback quality of γ1N Mushi has been improved. As a result, you can bring the VTR into your car and use the camera to enjoy the audio signals while driving around the city! A request arose. (
When the current V T' r Even when the tape ends, j - C <, the time it takes for r1 to be 41 seconds to unwind to the beginning end feels like it's not worth it.

OBJECTS OF THE INVENTION An object of the present invention is to eliminate the drawbacks described in the prior art and to propose an apparatus for endlessly reproducing audio signals.

Structure of the Invention The present invention uses a rotating head to generate video signals and j? j FT (i
'iF') Z recording and reproducing means, and one stage for recording and reproducing audio signals at the longitudinal end of the fixed blade i"C't-, and when recording audio signals with a rotary head. The audio signal is recorded with the tape running direction and the fixed head '!i1'', which is the reverse of the 7-1 running 1j direction of RuruIll, and the audio signal recorded with the rotating head is recorded in the tape running direction from the beginning of the tape to the end. Endless audio can be obtained by reproducing an audio signal recorded by a fixed head at the longitudinal end of the tape in the direction of travel from the end of the tape to the beginning of the tape.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will now be described based on the drawings. 1st
The figure shows the tape format of the VHS system, where 1 is the first audio track, 2 is the guard band, 3 is the second store track, and 4 is the control track. 5 is a track recorded by a rotating head. In the case of V it S, audio signals are multiplex recorded on the i-rack 5 by deep recording the audio signals. In other words, in addition to the video head for recording video signals, there are two rotary heads dedicated to audio, and first, the wide audio signal recording head in the gap is used to magnetize the magnetic field to the depths of the magnetic field, and then Only the near surface of the magnetic layer is magnetized by the narrow video signal recording head in the gap. That is, a video signal and an audio signal can be recorded on the track 5, where a video signal is recorded on the surface layer of the magnetic layer and an audio signal is recorded on the deep layer.

Figure 2 shows one embodiment of the present invention.

First, recording of a normal audio signal will be explained.

Es 7! input from the audio input terminal 11! '(jj
+-j4 is input to the input amplifier 12 via the D side of SW3.

SW3 is the output 2 of the sequential l1lJ11 circuit 28
5) -(- is switched. - The output side of the human power amplifier 12 is modulated by the 1 frequency positioner 13, then amplified by the recording amplifier 14, and the 2
T-'7 with two a voice recording rotating heads 15.21
'l is recorded on track 5. At the time of reproduction, it is reproduced by the n re-recording rotary head 15.21, and SW4, SW
It is input to the regenerative amplifier 22.23 through the [)[3 side of 5]. SW'l.

SW5 is also switched by the sequential control circuit 28T: recording and reproduction mode. The signals amplified by the regenerative amplifiers 22 and 23 are input to the head switch 11 path 24, and the two discontinuous signals are converted into one continuous signal at the output of the flip-flop circuit 68. The output of the head switch circuit 24 has a frequency of 4 ('JIJ device 2
! ), demodulated, amplified by the output amplifier 26, and output to the audio output terminal 27 via the R side of the SW 7. SW7 is switched by the output 30 of the sequential control circuit 28. Sequential control circuit IR2B (7)
Output 3 octl description 7. ) SW I & Tj
S W 2 (7) Controlled by state.

Next, the capstan servo related to Arp travel will be explained. During recording when an audio signal is recorded using a rotating head, a signal input from the video input terminal 16 is input to the vertical synchronization signal separation circuit 11. The vertical synchronization signal separated by the vertical synchronization signal separation circuit 17 is frequency-divided by a 1/2 frequency divider circuit, and then sent to the T1 track 4 by the head 20 via the recording amplifier 19 and the R side of SW6. Recorded as a playback control signal. The output of the 1/2 frequency divider circuit 18 is input to the phase-based trapezoidal wave generating circuit 31 via the R side of the SWB. The output of the trapezoidal wave circuit 31 becomes one input of the sample hold circuit 32. The output of the sample and hold circuit 32 is inputted to a speed-related speed setting monomulti 44 via a filter 3G. The output of the capstan motor 39 and the frequency generator 38 mounted on the body shaft is amplified by the FG amplifier 40 (&
The signal is input to the flip-flop circuit 42 through the A side of 0. On the other hand, the output of the FG amplifier 40 is divided by 'l/N!
After being frequency-divided by the first path 37, the other input of the ripple hold circuit 32 is applied via the R side of 5W11. , 1
, , / The number of divisions N of the N frequency dividing circuit 37 is the tape speed, 5
-rt 'fScun diameter, number of teeth of FG, input vertical rotation IVJ
Calculated by Shingetsu frequency. Flipf [1 Tsuzo 42
The output number is manually input to a trapezoidal wave creation circuit 43 and a monomulti 44. The outputs of the trapezoidal wave creation circuit 43 and the monomulti 44 are input to a 1 number 1 reference hold circuit 45. The output of the sample bold circuit 4 is inputted to the gain switching circuit 47 via the filter 46 (gain switching circuit 47).
The output of is supplied to a 2%-dobstamp 39 via a power drive amplifier 48. In this way, configuration 1 (:J: The retape is run at a constant speed. When internal recording is performed, the control signal reproduced from the head 20 (
, 1 The positive polarity pulse is amplified by the forward/reverse pulse amplifier 49, which triggers the racking monomulti 51 and outputs the output signal to the trapezoid via the Δ side of SW9 and the 1)[3 side of SW8. The signal is input to a wave generation circuit 31, and its output becomes one input of a sample and hold circuit 32. On the other hand, the output of the crystal oscillator 34 is input to a 1/M frequency dividing circuit 35, frequency-divided, and then input to the sample pulse circuit 33 via the PB side of 5W11. The output of the sample pulse circuit 33 becomes the other input of the I3L ring hold circuit 32 (the output of the sample hold circuit 32 is supplied to the speed setting monomulti 44 via the filter 36 as in the case of recording). With this configuration, tracking monochrome!
By setting the d extension of +1, the rotary head 15.21 scans over the track 5.

Next, 1J, reverse recording will be explained. In FIG. 2, in the case of linear recording in reverse, recording is performed at a tape speed five times that in the case of forward/J direction recording. Also, regarding reverse recording, the signal is recorded in the forward direction and can be recorded when the signal is in the forward direction.Therefore, even during reverse recording, SW6, SW8.
1 control circuit 28 to the tP13 side.

Turn on SW1 during reverse recording. If swi is in the ON state <r tl, the output terminal 29.30J of the sequential control circuit 28, SW'3 becomes the C side, and 5W7G
Yo [two sides IJ - grounded;,; is done. The signal H is input to the audio input terminal 11 and is input to the recording equalizing amplifier !+2 via the C side of the SW 3, and its output is input to the recording amplifier 52. The output of the recording amplifier 53 is The output of the bias oscillator 54 is combined with the mixer 55, and 5W1
5W12 is recorded on track 3 of tape 1 by fixed head 56 via the R side of 2.

Connected to the side at 1 only during reverse recording, SW4, SW
5 is controlled by a sequential control circuit 28 connected to the R side only during normal recording.

Next, the output of the G amplifier 40 is input to the 1/'5 frequency divider circuit 41, and the frequency is divided by 175 and output. It passes through the B side of 5W10 and is input to the flip flow rough 0 tube 42.5W10 is controlled by the output terminal 59 of the sequential control circuit 28, and 5W10 is connected to the B terminal only during reverse recording and reverse playback. i・lef
l+lI all Ii'! l'tR2B(D exit I
J fa 5'l(D'M 8 te, Kane tljt
By switching the gain of the fl path 41, the Kitobustan-939 rotates at about F1 times the speed. First written 1c
Similarly, the control signal reproduced by the head 20 is S.
It enters the forward/reverse pulse amplifier 49 via the PB side of W6. Since the tape is running in the opposite direction, the <'J pulse is amplified and output from the forward/reverse pulse amplifier 49.
The output that has been frequency-divided by 125 is input to the B side of SW9, S
The signal is input to the trapezoidal wave creation circuit 31 via the PB side of W8. The output of the trapezoidal wave creation circuit 31 is the sample hold circuit 3
This is one input of 2.

The output of the crystal oscillator 34 passes through a 1/M frequency divider circuit 35,
The output of the ++'IJ sample pulse circuit 33, which is input to the sample pulse circuit 33 via the PB side of W11, becomes the other input of the sample hold circuit 32. The output of the sample and hold circuit 32 is input to a monomulti 44 via a filter 36. By doing this, the tape can be run at five times the tape speed during recording.

Next, repeat repeat (Explanation 1jru1, repeat1~
If so, turn SW2 ON. When the information that SW2 is ON is input to the sequence control circuit 28, SW3 is set to [J side, SW/1, SW' b, SW
6 is on the PB side, SW7 is on the B side, SW 8 &J, [)[
3 side, SW9.8W10 is A side, 5WII is P [3
side, 5W12 are controlled by the sequence control circuit 28 so that they are respectively connected to the 1]B side. In addition, according to the signal at the output end 59 of the sequential control circuit 28, the forward/reverse pulse amplifier 49 is switched to amplify the positive pulse, and the gain switching circuit 47 is also switched to match the gain of 1*. Further, at the output end 60 of the sequence control circuit 28, the motor frequency f amplification: jj48 is 1
- The Yabustan motor 39 rotates forward. 1: For example, if the output terminal 60 is H, the rotation is forward;
If so, the motor drive amplifier 48 may be designed to rotate in the opposite direction). With this setting, the sequence 11 control circuit 28J outputs an output so that the pinch roller (not shown) is pressed against the capstan (not shown), and the take-up reel is rotated in the forward direction. The rotating head 15 moves in the forward direction at 1x speed, and as explained earlier,
．． The audio signal reproduced at '21 is output to the audio output terminal 127. As the tape 7-1 moves forward in this way, the end detector 61 detects the end 4 of the tape.

The output from the termination detector 61 is sent to the sequence control circuit 2.
When 8 is input, the pinch 1 cola is separated from the capstan, the reel rotation stops, and the tape stops running.

Next, the output from the sequential E 1911 circuit 28 -
Then, SW7 is switched to the B side, and SW9 and 5W10 are switched to the B side. Sequential control circuit 2
The forward/inverse pulse amplifier 49 is switched to inverse pulse amplification by A8\-5 at the output terminal 59 of 8, and the gain switching circuit 4
7 can also be switched to match the 5x gain. Also, a signal at the output end 60 of the sequence control circuit 28 causes the motor drive amplifier 48 to set the capstan motor 39 to reverse rotation. SW4. SW5. SW6゜S
W8.5WII and 5W12 are connected to the Pa side. After being switched in this way, the binge L1-ra is pressed against the reel and rotates in the opposite direction.
, 5x speed IQ in the opposite direction (27, l', t'+
Rir. The signal reproduced by the head 56 is S W 12 (
1) 1) Play E1 Rice amplifier through 11 side! −
7 amplifies 4′! , through the output amplifier 58, and through the B side of SW7. Audio output is output to the 4-voice output terminal 27. As the larb travels in the opposite direction to the J-brave, the starting edge detector 62 detects the starting edge of the ``J-brave''. When the output of 2 to the starting edge detector is sent to the sequential control circuit 28, the pinch should be from the capstan (), sf
No, the rotation of Ilir is also stopped. After the tape is stopped, the J! (l;
? , the I-P is run in the forward direction, and the RAD C is rotated.
I: The audio signal is output to the audio output terminal 27. ,
By doing this, the start and end points are detected and when switching occurs, the audio is momentarily interrupted, but overall it is possible to reproduce the audio signal continuously.

In addition, the output of SW8 and the output of the Rinsol pulse circuit 33 are input to the synchronization detection circuit 63 (check whether the Yayabustan Livo has entered the synchronization state or not), and if it is in the synchronization state τ', the synchronization signal detection circuit 63 so that the 1 rubel signal 4 is input to the sequential control circuit 28.
- It is possible to install a digital audio recording circuit to mute the audio horn until a synchronization state is detected. It is also possible to cancel the reverse running recording state by displaying 91224 as there is no 1 control signal when there is no 41 t no LJ' in the synchronized state, and to change to the [I-B 11- state]. It is.

The synchronization detection circuit 63 can be configured by creating a window using the output of SW8 and checking whether the pulse of the 4 non-pull pulse circuit 33 is within the window.

The head 64 detects the rotational phase of the rotary head, and the PG amplifier 65 adjusts the phase at intervals of about 1806 times per rotation (the forward and reverse pulses that are output are amplified, and the positive pulses are adjusted in phase by a normal pulse). 1), the negative pulse likewise triggers the phase adjuster 67. Phase adjuster 6
By setting the delay amounts of G and G7, the rotating Hachinohe i-head can trace track 5. The output of the phase adjuster [i (i, i7) (,1 triggers the flop flop circuit 68, and its output is supplied to the head switch circuit 24 and the cylinder control system 6te).The cylinder control system 69 and the video signal The operations during recording and reproduction are not directly related to the present invention and will therefore be omitted.

V) (S has been explained above, but when it has PCM audio like 8mm de A (, 2), when traveling in the forward direction, PCM71-
), play linear audio when waiting for reverse driving.
Of course it is also possible to make M1, or 81111+
There is no control signal like 1 Bij'A, and Bi'i'
If a pilot signal is recorded on the A-l rack, run the tape at a constant speed in the opposite direction at several times the speed.1
! It is also an application of Japanese Patent Application Publication No. 1-194480.
It is possible.

[Effects of the Invention] - According to this report, if there is a magnetic recording/reproducing device that can record audio using a rotating head, it is possible to achieve the effect of interrupting the audio A signal by one tone by adding a small amount of circuitry. have Furthermore, if the linear A-de 1, tsu-4 recording speed is made several times the tape speed used when recording audio signals with a rotary head, the current V-11'< Kotosa 2 (l m lII S (! 7 called 0 weak)
- Even in the v r r < of the V speed trace, it is possible to approach the recording 1, i, :'u voice characteristic 1 fl with a rotating head, and it is possible to record IA Song 19 from the endless C interval.

[Brief explanation of drawings]

FIG. 1 is a tape pattern diagram according to the present invention, and FIG.
1 is a block diagram of an embodiment of the one-tree invention; FIG.

Claims (1)

[Scope of Claims] 1. Means for recording and reproducing video signals and audio signals with a rotating head, and means for recording and reproducing audio signals on the longitudinal end of a tape with a fixed head, and the rotary head records and reproduces audio signals. A magnetic recording/reproducing device in which the tape running direction during recording is reversed from the tape running direction when recording audio signals using a fixed head. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the tape speed when recording an audio signal with a fixed head is set to a faster tape speed than when recording an audio signal with a rotating head. 3. When the auto-repeat setting switch is on and the tape is running in the forward direction, the rotary head plays the recorded audio signal, detects the end of the tape, and then automatically runs the tape in the reverse direction. The magnetic recording and reproducing apparatus according to claim 2, characterized in that the tape is automatically run in the forward direction after the audio signal recorded by the fixed head is played back and the beginning of the tape is detected. Device. 4. Claim 2, characterized in that recording is prohibited when the synchronization detection circuit of the capstan motor cannot detect a synchronization state during recording with a fixed head.
The magnetic recording and reproducing device according to item 1 or 3.