JPS62217403A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute post-recording of a sound signal which has been recorded by a rotary head, by storing temporarily a video signal of a track immediately before it is erased, in a memory, recording another sound signal, and thereafter, reading it out of the memory, and recording it again. CONSTITUTION:At the time of post-recording, when a video signal reproducing rotary head 22 is reproducing a track, a rotary erasing head which follows the head 22 erases the track simultaneously. Also, a sound signal recording rotary head 21 which follows the rotary erasing head and a video signal recording rotary head 16 record successively a sound signal and a video signal in its erased track. In that case, a signal which is brought to deep layer recording by the head 21 is other signal than a signal before erasion, which is supplied from an input terminal 17. Also, the video signal recorded by the head 16 is a video signal which is reproduced by the head 22 immediately before it is erased by the rotary erasing head, and has been written in a field memory 29, and it is read out and brought to lap-recording in the corresponding same track.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a magnetic recording/reproducing device, in which an audio signal is deeply recorded by a rotating head for Rh signal recording attached to a rotating drum in the fi, and a magnetic recording/reproducing device is used for recording a video signal. In a device in which a video signal is recorded by inserting it into the Φ with a rotating head, the so-called 7-ru signal is used, in which the deep-recorded IJ audio signal is partially erased and another audio signal is recorded in place of the erased Rh signal. The present invention relates to a magnetic recording/reproducing device that makes it possible to perform

(Prior Art) In general, in a helical four-janning type magnetic recording/reproducing device (V-TR), a plurality of rotating heads, for example, two rotating heads, are installed at equal angular intervals on a rotating body such as a rotating doff 1. Take f1 and apply 0 to this rotating body, for example, in an angle range of a little over 1806.
A magnetic chill is run while winding the magnetic tape, and a video signal is recorded on each magnetic tape by forming an inclined track with a rotary head, and an audio signal is set in the middle of the magnetic tape running path. A fixed head is used to record on the B-angle signal track in the longitudinal direction of the magnetic tape, and during playback, a co-rotating head reproduces the video signal and the fixed head l:J
Devices such as the J-type are well known for reproducing audio signals.

On the other hand, the length of time between records 1 and v1 of VTRs has increased (accordingly, the running speed of the tape, which is directly related to the recording and playback of audio signals by the fixed head, has decreased, and the Rh signal that was not recorded by the fixed head has become longer). The quality will deteriorate.

Therefore, we solved this problem and made it possible to record and replay high-quality audio signals.
In order to do this, as shown in FIG. tλ voice signal frequency modulated from F2.2 [r deep part of magnetic Qigu 1 1. Record two and -1 (11
Recording video No. 18 (9
21. As shown in the Q-rack pattern in Figure 6, record 1, 7M, 2, 1, 2, and 3 sounds in the same track, and then proceed to recording and reproducing the Rh signal. A VTR has been commercialized that can obtain high-quality Rh signals by significantly increasing the relative linear velocity between the heads.
(There is.

Also, in the past, the audio signal already recorded on the magnetic disk was partially erased. So-called post-recording is performed in which another audio signal is recorded instead of the audio signal.

(Problems to be Solved by the Invention) However, as described above, in a VTR that deeply records audio signals and overwrites video signals on top of the audio signals, the audio recorded by the rotary audio signal recording head is "Signal Afret"
[If you do this, delete the signal to be combined] Since the old video signal superimposed on the same track as the original will also be deleted at the same time, it is necessary to record another audio signal in that part (dub-recording).
Even if you tried to do so, the video signal for the erased portion would be lost, making it impossible to post-record the audio signal as a different content (signal) while leaving the video signal as it is.

For this reason, conventionally, a high-pitched voice signal with the same content as the B voice signal recorded by the above-mentioned rotary head for audio signal recording is recorded by a fixed head in the longitudinal direction of the magnetic tape. After-recording of the audio signal from 1 to 1 (-5).

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic recording and reproducing apparatus which solves the above-mentioned problems of the conventional technology and makes it possible to perform dubbing of audio signals recorded with a quadriphonic head for recording a combined voice signal. .

(Means for solving the problem) In order to achieve the above object, the present invention provides a magnetic recording medium (
Rotating body (T) is spliced and wound around the required angle range (
34), a video signal recording rotary head (16) having at least a recording function and an audio signal recording rotary head (16) having at least a recording function, which have different azimuth angles. A running magnetic recording medium <-1-) is mounted such that the rotary head for recording voice signals (21) is in a position preceding the rotary head for recording video signals (16). 10. The audio signal is deep-recorded at a predetermined track pitch using the audio signal recording rotary head (21).
The video signal recording head (16) overwrites and records video signals on the rack 10 (the video signal recording device also plays back the video signals recorded by the video signal recording rotary head (16)). At the same time, the rotary head (21) for audio signal recording is mounted on the rotating body (34), and the rotary head for video signal reproduction (
22), the video signal and audio signal recorded by the video signal recording rotary head (16) and the audio signal recording rotary head (21) are simultaneously erased. Rotating head (22) J,
a rotary erasing head (35) mounted so as to be located at the rear of the frame and ahead of the audio signal recording rotary head (21); and a video signal reproducing rotary head (22).
The rotary head (3
5), the video signal of the track immediately before being erased is stored in the storage means (29), and the rotating old head (35)
On the rack 1 from which the video signal and audio signal have been erased, an audio signal different from the audio signal recorded on the erased track is recorded by the audio signal recording rotary head (21), and the audio signal is erased. This invention provides a magnetic recording and reproducing device characterized in that the video signal recorded on the recorded track is read out from the storage means (29) and recorded again by the video signal recording rotary head (16). .

(Function) In the magnetic recording/reproducing 5A device having the above two configurations, the video signal of the track to be dubbed is reproduced by the video signal reproducing rotary head (22) immediately before erasing the track, and is stored in the storage means. (29), the video signal and audio signal of the track to be dubbed are erased by the rotary erasing head (34), and furthermore, a reputation signal different from the audio signal that was deeply recorded on the track is erased. is deeply recorded on the track, and the video signal of the track stored in the storage means (29) is again overwritten and recorded on the track. Therefore, on the dubbing track, a different audio signal is recorded, and the original video signal is recorded as is.
No loss of video signal occurs.

(Embodiment) An embodiment of the magnetic recording/reproducing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block system diagram showing an embodiment of the magnetic recording/reproducing vX device according to the present invention.

In the figure, reference numeral 10 denotes an input terminal to which a video signal is supplied, and this video signal is supplied to a Y/C separation circuit 11, where it is separated into a luminance signal Y and a color signal C, and output.

The luminance signal Y separated by the Y/C separation circuit 11 is sent to the switch circuit S14. After being supplied to the FM modulator 12 via terminal n of , and frequency modulated there, this frequency modulated luminance signal is supplied to the ilWl circuit 13.

On the other hand, the separated color signal C is supplied to the frequency converter 14, where it is converted to a low frequency, and then this low frequency converted carrier color signal is sent to the mixing circuit 13 via the terminal n of the switch circuit brocade 2. is supplied to

Note that the switch circuit SM and the switch circuit SH2 are switched in conjunction with each other.

The mixing circuit 13 mixes the supplied frequency modulated luminance signal and the low frequency conversion carrier color signal, and this mixed signal is amplified by the recording amplifier 15 and then sent to a rotating drum (not shown).
The video signals are recorded on the magnetic tape T by a video signal recording rotary head 16 mounted on the magnetic tape T.

In addition, 17 is an input terminal to which an audio signal is supplied, and this audio signal has its high frequency components removed by a low-pass filter (LPF) 18, and is then supplied to an FMI modulator 19, where it is frequency modulated. The modulated audio signal is sent to recording amplifier 2.
After being amplified by 0, the magnetic tape T
recorded in

On the other hand, 22 is a rotating head for video signal reproduction attached to a rotating drum (not shown), and this is attached to a position preceding the aforementioned rotating head 21 for recording audio signals.

The video signal reproduced by the video signal reproduction rotary head 22 is amplified by a preamplifier 23, and is then amplified by a bypass filter (11PF) 24. Bandpass filter (RPF) 25
The output of the HPF 24 is supplied to the FM demodulator 26, where the luminance signal Y is converted to A/[
)1 is supplied to the converter 21, and the color signal Cl, LA/l) which is the output of the BPF 25 is supplied to the converter 28.

The A/D converters 27 and 28 are respectively supplied with an I/D converter [
] The reproduced luminance signal Y and the reproduced color signal C, which are the information of the
Convert each to a digital signal and send it to Feelmos Sevenari 29
The FIELMOS 729 writes (memorizes) the information of the luminance signal Y and color signal C, which are the supplied digital data, as data.

Note that this field memory 29 includes a set of video signal reproduction rotary heads 22, 221. $2) Two field memories #1 for occupying video signals of odd and even fields to be reproduced respectively. Iwa 2C is constructed.

The data written in the FIELMOS 729 is read out at a predetermined timing 'C, and the digital data corresponding to the luminance signal Y is sent to the D/A converter 30, and the digital data corresponding to the color signal C is sent to the D/A converter 30. They are respectively supplied to converters 31 .

The D/A converters 30 and 31 convert the supplied digital data into a brightness signal Y and a color signal C of the ablog, respectively. and l')/A converter 30
The output of is supplied to terminal a of the switch circuit SW, and the output of D/
The output of the A converter 31 is supplied to the terminal a of the switch circuit SW2.

Still, the output of the FM tuner 26 is supplied to the synchronization separation circuit 32, where the vertical and horizontal synchronization signals are separated, respectively. It is supplied to the circuit 33.

This is the signal generator and W/R timing! The control circuit 33 generates a clock signal based on the supplied synchronization signal, and transmits this clock signal to the A/D converter 27.2.
8, the field device 29, and the D/A converters 30, 31, and also supplies timing signals for writing (W) and reading the field memory 29 to the field device 29. (W) or read out the data of this FIELMOS 7RI29)
controls the operation of

Now, the positional relationship tJ-tJ of each rotary head attached to the above-mentioned rotary drum 34 will be explained.

As shown in FIG. 2, a pair of video signal recording rotary heads 16, 16 (head 1, head 2) is mounted at a position facing the rotary drum 1\34.

Furthermore, a rotary head 16.16 (young 1°1
12) A pair of reputation signal recording rotary heads 21 and 21 (11, $2) are also installed at positions opposite to each other on the rotary drum 34, respectively.

Furthermore, a set of audio signal recording rotary heads 21°21
The position on one side of the rotary drum 34 that precedes one of the audio signal recording rotary heads 21 (II) among (11, 12) One rotary erasing head 35 is installed after the video signal reproducing rotary head 22 (12) of -h in 1.12) (at the position -■).

Then, a position (
That is, the rotary head 21 (11) for recording the voice signal
Of course, a pair of video signal reproducing rotary heads 22, 22 (11, bamboo 2) is also attached to the opposite sliding device of the rotary drum 34 (at a position preceding the rotary drum 34, of course). Regarding the width of each rotary head, the width of the rotary erasing head 35 is approximately twice that of the other rotary heads, and the width of the other heads is approximately the same.

Next, the operation of the above-mentioned device of Seranari will be explained.

In FIG. 1, during normal recording, the movable contact pieces of the switch circuit 1 and S12 are respectively switched to the terminal n side, and during "adjustment", the movable contact pieces of the switch circuit 314° and SA2 are respectively switched to the terminal a side. It will be done.

First, during normal recording [at this time, switch circuit SW, 3
142 movable contact pieces are respectively on the terminal n side],
Video signal supplied from input terminal 10 and input terminal 1
The R angle signal supplied from
Easily recorded.

Next, during post-recording [at this time, switch circuit SI4. .

The operation of each movable contact piece of SW2 on the terminal a side will be explained.

FIG. 3 shows the positional relationship of each rotary head in the L-rack pattern of the magnetic Arp during dubbing.

FIG. 4 shows recording of video signals by a rotary head for recording video signals and a rotary head for reproducing video signals.

FIG. 6 is a diagram illustrating an example of reproduction timing and an example of writing and reading timing of a field memory. In addition, in the same figure, the track number (ie, field memory) in the track pattern of the magnetic tape T shown in FIG. 3 is shown in brackets.

As shown in FIG. 3, during post-recording, one video signal reproducing rotary head 22 (11) is moved to the track INF (however,
(N is a natural number), the rotary erasing head 35 following the video signal reproducing rotary head 22 (II) simultaneously erases tracks [N-1] and [N-21]. Further, one audio signal recording rotary head 21H1) and video signal recording rotary head 1B(II) following the rotary erasing head 35 sequentially record audio signals and video signals on the erased track [N-2].

At this time, the audio signal recorded deep by the audio signal recording rotary head 21 (N) is a different audio signal from the audio signal deep recorded in the track [N-2] at the input terminal 17.
It is supplied from and recorded deep.

Further, the video signal recorded by the video signal recording rotary head 16 (111) is reproduced by the video signal reproducing rotary head 22 immediately before the video signal of the track [N-2] is erased by the rotary erasing head 35. Then, the video signal written in the field memory 29 (field memory number 1) is read out and overwritten and recorded again on the same corresponding track [N-2].

Next, when the other video signal reproducing rotary head 22 (12) is reproducing track [N+1], the other audio signal recording rotary head 21 (12) and the video signal recording rotary head 16 (record 2 ) sequentially records audio and video signals. In that case, similarly, the audio signal that is deep recorded by the audio signal recording rotary head 21 (company) is different from the audio signal that was deep recorded on the track [N-11] from the input terminal 17. supplied and recorded deep.

Further, the video signal recorded by the video signal recording rotary head 16 (12) is transferred to the video signal reproducing rotary head 22 ($ 2) and play the field memory 2.
The video signal written in 9 (field memory 12) is read out and recorded again in the same corresponding track [N-11] in an overlapping manner.

When finishing the post-recording, if the recording is finished at the same time as the other video signal recording rotary head 16 (12) finishes recording, there will be no loss of video signals.

(Effects of the Invention) As described above, according to the magnetic recording and reproducing device of the present invention,
Immediately before erasing the track, the video signal of the track to be dubbed is reproduced by the rotary head for video signal reproduction, it is temporarily stored in the storage means, and then the video signal and audio signal of the track to be dubbed are rotated. The erasing head erases the signal, and furthermore, deep-records an audio signal other than the sound reproduction signal that was deep-recorded on that track, and reads out the video signal of that track from the storage means and re-records it on that track. Since overwriting is performed, it is possible to perform dubbing of the audio signal recorded deep with the audio signal recording rotary head. Therefore, in the dubbing track, only the audio signal is recorded as a different one, and the video signal is the original one. This means that the video signal is recorded as is, so no video signal is dropped, and it has the advantage that it is effective, for example, for editing work on the audio signal recorded by the audio signal recording rotary head.

[Brief explanation of drawings]

FIG. 1 is a block system diagram showing an embodiment of the magnetic recording/reproducing device according to the present invention, FIGS. 2 to 4 are diagrams for explaining the present invention, and FIG. Figure 3 shows the positional relationship of each rotary head in the track pattern of the magnetic tape during post-recording. Figure 4 shows the rotary head for recording video signals and the rotary head for reproducing video signals. An example of the recording and playback timing of video signals by the rotary head and the writing and reading timing of field measurements is shown in a small diagram. 1 and 6 are diagrams similarly showing the positional relationship of each co-rotating head in the track pattern. 10...Video signal input terminal, 11...Y/C
Separation circuit, 12, 19... FM modulator, 13... Mixing circuit, 14... Frequency converter, 15.20... Recording amplifier, 16... Rotating spatula for recording video signal 1:, 1
1...h Re-signal input terminal, 18...(1)[,2
1... Rotating head for recording high voice number 13, 22... Rotating head for playing video number 16, 23... Zolino 1 unit, 2
4...l-I F) t, 25...B P [,2G
...FM demodulator, 27, 28...A/D converter, 29...Tweel tomeshiri, 30, 31...[)
/A converter, 32... Synchronous separation circuit, 33... Rim number generator and 14/l (timing control circuit, 34... Rotating drum, 35... Rotating erasing head, S
W, 5142...-Switch circuit, -F...Magnetic 1-B. Toy Feel P 47-: (1 track 10) E61 N:ry-24 included [Nlf included]
□□□□□□－□□－－□－□□□□□□－－
■１ □□ - Cloud [g.
−1−――−■=21 pyo−−−−111−−−−−
2 and "p key --- 11 --- Back] Do [N-da] Kichishi + Taotsu (U-U) Steel 4
or L [A/-tE
I explained it to you.
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

Claims (1)

[Claims] A rotating body on which a magnetic recording medium is attached and wound over a required angle range is provided with a video signal recording rotary head having at least a recording function, and a video signal recording rotary head having a different azimuth angle and having at least a recording function. A rotary head for recording an audio signal is mounted such that the rotary head for recording an audio signal is positioned in advance of the rotary head for recording a video signal, and the audio signal is recorded on the traveling magnetic recording medium. The apparatus further includes: after an audio signal is deeply recorded at a predetermined track pitch by a recording rotary head, a video signal is overwritten and recorded on the audio signal track by the video signal recording rotary head;
a video signal reproducing rotary head that reproduces the video signal recorded by the video signal recording rotary head and is attached to the rotary body at a position preceding the audio signal recording rotary head; The video signal and the audio signal respectively recorded by the video signal recording rotary head and the audio signal recording rotary head are simultaneously erased, and the rotary head is placed behind the video signal reproducing rotary head, and the a rotary erasing head mounted to a position preceding the rotary head for recording audio signals; and a storage means for storing video signals of tracks reproduced by the rotary head for reproducing video signals; The video signal of the track immediately before being erased by the erasing head is temporarily stored in the storage means, and the audio signal recorded on the erased track is stored in the track from which the video signal and audio signal have been erased by the rotating erasing head. A different audio signal is recorded by the audio signal recording rotary head, and a video signal recorded on the erased track is read from the storage means and recorded again by the video signal recording rotary head. A magnetic recording/reproducing device characterized by: