JPH05779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method and apparatus for recording information signals such as video signals and audio signals using a rotating head, and particularly relates to a method that can perform splice recording well.

BACKGROUND TECHNOLOGY AND PROBLEMS For example, when photographing a desired subject with a television camera and recording it on a tape with a VTR, after photographing and recording a certain scene, In many cases, the camera is used to record a different scene and connect it to the previous scene.

At this time, as shown in Figure 1, a record trace of the control signal C _T
If the pitch τ becomes an arbitrary pitch τ'≠τ, the servo will be disturbed at the joint between the scenes during playback, resulting in a distorted reproduced image. Therefore, a continuous recording method is used in which the recording pitch of the control signal is correctly set to τ even at the joint between these scenes, so that the reproduced reimage is not disturbed at this joint.

As an example of this continuous recording method, the following is conventionally known.

In this case, the VTR is put into a pause state between scenes, and the control signal to be recorded is based on whether the pinch roller is pressed against the capstan shaft when the pause state is turned on or off. This is a method of mechanically controlling the recording pitch of the control signal so that it is synchronized with the vertical synchronization signal that becomes approximately τ even at the joint portion. That is, timing is determined by a recording control pulse when a pause is applied, and timing is also determined by this recording control pulse when a pause is released. In this way, when you pose,
In other words, since the tape stops at a certain distance _D1 from the recording position of the control pulse,
Next, by mechanically setting the tape movement distance D ₂ to the recording position of the first control pulse after releasing the pause so that D ₁ + D ₂ = τ, the recording pitch of the control pulse can be kept constant. It is possible to do so.

By the way, when a VTR is set to stop mode, a tension arm is usually used to loosen the tape to prevent it from sticking to the drum. Therefore, with the conventional splice recording method described above, once the VTR is placed in stop mode, splice recording becomes impossible. This is because even though the timing for releasing the pinch roller from the capstan was determined in accordance with the recording control signal, the position changed as the tape was loosened, and the tension arm had to be moved the next time to record. Even if you put it back and tense the tape,
This is because it does not necessarily return to its original position.

Similarly, even if the tape is replaced, the position is not determined at all, so the above method cannot be used to record splices.

Also, as another method, at the joint
When you put the VTR in the pause or stop state, move the tape back by, say, 15 control signals from that position, and then when you release the pause or press the record button next time, you move the tape back from that position by, say, 12 control signals. For a period of 12 minutes, the playback servo is applied by the playback control signal obtained at that time, so that the rotary head just tracks to the joint position, and from the time when 12 playback control signals are counted. This is a method to set the actual recording mode. If this is done, the pitch of the control signal record C _T at the joint will be correctly τ.

However, this method assumes that the playback servo is applied during the period of 12 control signals at the beginning of recording, and in the case of a recording-only machine, the playback servo cannot be used because there is no circuit, or it is only used for recording. The machine must be specially equipped with an unnecessary regeneration servo circuit.

Therefore, when this recording-only machine is especially taken into consideration, the former method is more effective.

However, as mentioned above, the former method does not allow continuous recording after the stop mode or tape conversion. However, after shooting a certain scene,
Considering that it takes a relatively long time to take the next scene, it is not desirable to keep the tape under tension for a long time in a paused state, and accidents such as the tape sticking to the drum are likely to occur. It is better to return to stop mode. Therefore, if it is possible to continue recording from this stop mode, it will be very convenient to use.

Purpose of the Invention In view of the above points, it is an object of the present invention to provide a method and apparatus which can be applied to a recording-only machine and which allows continuous recording even in stop mode or after replacing the tape.

Summary of the Invention This invention temporarily puts the tape in a playback state prior to recording, and pauses the tape at the appropriate timing using a playback control pulse obtained at this time.
Next, by timing the recording control pulse to start tape running and entering the recording mode, the pitch of the recording trace of the control pulse is maintained at the correct pitch τ even at the next point. .

When the tape is replaced, the previously recorded control pulse is present, so the playback control pulse that precedes the above recording can be obtained, but when recording continuously on one tape, the tape is simply changed at the end of one scene. The above playback control signal cannot be obtained just by stopping. Therefore, in such a case, when entering stop mode or pause mode, mechanically move the tape back a predetermined amount so that a playback control pulse can be obtained to set the timing before the next recording. It is something.

EXAMPLE Hereinafter, an example of the method and apparatus of the present invention will be explained with reference to the drawings.

Figures 2A to 2H are diagrams showing changes in the tape path system for explaining this example, Figure 3 is a block diagram of an example for splicing this example, and Figure 4 is a diagram for explaining the example. It is a time chart.

In Fig. 2, 1 is a tape, 2 is a supply reel, 3 is a take-up reel, 4 and 5 are brake shoes for controlling the rotation of these reels 2 and 3, and 6 is a drum to which a rotating head is attached. , 7 and 8 are loading guide pins for winding the tape 1 around the drum 6 at a predetermined angle; 9 is a capstan; 10
is a pinch roller, and 11 is a pin attached to the tension arm for the tension regulator (for the sake of simplicity, the tension arm 11 is
12 is a fixed magnetic head for recording and reproducing control signals.

Whether or not to press the brake shoes 4 and 5 against the drive system of the reels 2 and 3 to apply the brakes (hereinafter simply referred to as brake on/off);
Whether to transfer the tape 1 by turning on/off the pressing of the pinch roller 10 on the capstan 9 side (hereinafter simply referred to as “on/off of the pinch roller 10”)
are each controlled by a plunger. Third
In the system diagram shown in the figure, monostable multivibrator 2
0, 30, 40 and 50 are for controlling on/off of these brakes and the pinch roller 10, monostable multivibrator 20 is for brake on, monostable multivibrator 30 is for brake off, The monostable multivibrator 40 is used to turn on the pinch roller 10, and the monostable multivibrator 50 is used to turn off the pinch roller 10. In this example, monostable multivibrators 20, 30, 40, and 5
This output is supplied to a brake plunger drive circuit and a pinch roller plunger drive circuit (both not shown), and when a trigger or the output falls to "0", a predetermined value is generated. It is designed to perform the following actions.

Further, the tension arm 11 is operated by a tension regulator so that a force is always exerted in the direction shown by the arrow 13 in the figure to tension the tape 1 at a constant tension.

Next, let's explain step-by-step how splice recording works.

[1] FIG. 2A shows the apparatus in a recording state, with the brake off and the pinch roller 1 on. Tape 1 is capstan 9
is held by pinch rollers 10 and transported in the direction shown by arrow 14, and one diagonal magnetic track is sequentially formed for each field on tape 1 by a rotating head attached to drum 6 that rotates at a constant rotation speed. At the same time, a 30 Hz control signal is recorded by the fixed head 12 at one edge of the tape 1 in the width direction.

At this time, the recording mode signal REC (FIG. 4B) is at a low level.

[2] In the above recording state, when the stop button or pause button is pressed, a trigger pulse TG ₁ (FIG. 4A) is generated.

This trigger pulse TG ₁ is supplied to AND gates 23 and 24 through a terminal 21 in an inverted state, respectively, in FIG.
4 is supplied with the same polarity, and the AND gate 23 is supplied with the reversed polarity, so
A pulse P ₁ is obtained at the output A ₁ of the AND gate 23 (FIG. 4C). This output A ₁ is inverter 2
5. Since it is supplied to the monostable multivibrator 20 through the OR gate 26 and the inverter 27, the monostable multivibrator 20 is triggered by the fall of this pulse _P1 .
Its output B _ON (G in the same figure) becomes "0". Therefore, from the time the output B _ON falls, the brake is turned on and the rotation of the reels 2 and 3 is stopped.

However, since the monostable multivibrator 50 for turning off the pinch roller 10 is not triggered,
Pinch roller 10 remains on and tape 1 is further transported.

Therefore, as shown in FIG. 2B, the tension arm 11 is biased in the direction of the arrow 15, and the tape 1 between the take-up reel 3, the capstan 9 and the pinch roller 1 becomes slack.

[3] At this time, the output A ₁ of the AND gate 23
The counter 28 is cleared by the pulse P ₁ obtained at , and its output C ₁₀ (FIG. 4E) rises to "1". On the other hand, the recording mode signal REC is supplied to the enable terminal of this counter 28, and this counter 28 is in a countable state. Therefore, the control pulse CT _R (D in the same figure) to be recorded from the input terminal 29 is the output
It is gated by C ₁₀ and fed to the clock terminal of this counter 28 for counting. Then, when the count value reaches “10”, the output signal
_C10 falls to "0". Therefore, after that, the recording mode state, that is, the signal REC is "0".
At this time, the pulse _CTR is no longer supplied to the counter 28 until the AND gate 23 receives a pulse again.

This signal _C10 is passed through an OR gate 31 and an inverter 32 to a monostable multivibrator 50.
Therefore, this monostable multivibrator 50 is triggered by the fall of this signal _C10 , and its output P _OFF (H in the figure) falls to "0". Therefore, the pinch roller 10 is turned off. Then, as shown in FIG. 3C, the tension arm 11 moves the take-up reel 3.
The slack tape 1 is pulled between the capstan 9 and the pinch roller 10, and the tape 1 is pulled back by the slack amount. As mentioned above, the pinch roller 10 is turned off after the trigger pulse TG ₁ is generated and after 10 control pulses _CTR are counted, so the slack of the tape 1 is caused by this control pulse _CTR .
Therefore, the amount of tape pulled back is also equivalent to 10 control pulses _CTR .

[3]' Furthermore, the following operation is performed at the same time as this pinch roller 10 is turned off. That is, the falling edge of the signal _C10 from the counter 28 is supplied to the set terminal of the flip-flop circuit 34 via the delay monostable multivibrator 33, which is set and its output L _OFF (Fig. 4 I).
falls to "0". This output L _OFF is supplied to the unloading circuit 35, and the loading pins 7 and 8 are returned slightly as shown in FIG. 2D, thereby loosening the tape 1. By loosening the tape 1 in this way, the tension arm 11 can easily pull back the tape 1, and the tape amount corresponding to 10 control signals _CTR can be completely returned. The monostable multivibrator 33 for delay is connected to the pinch roller 1
Loading pin 7 after turning 1 completely off.
This is to allow the pinch roller 10 to be turned off by the plunger.

Note that when the loading pins 7 and 8 are unloaded and returned slightly, the loading end detection switch turns off, for example.
The detection signal LE falls to "0". This signal LE is supplied to the reset terminal of the flip-flop circuit 4 through an input terminal 36 and a monostable multivibrator 36 for delay, and is reset by the fall of this signal LE.

If the trigger pulse TG ₁ is obtained by pressing the stop button, that is, in the stop mode, the stop mode is completed as described above. In this case, the recording mode signal REC (Figure 4B) remains in the state of "0" until the control signal _CTR to be recorded is counted 10 times, and the signal C ₁₀ is obtained after counting 10 times. When the flag is set to "1", the non-recording mode is set. In other words, the signal system remains in the recording state until the pinch roller 10 is turned off, and therefore,
After reels 2 and 3 stop, when forming 10 slacks of control pulse _CTR ,
The video signal and control pulse are recorded on tape 1, and those portions are pulled back.

In this stop mode, the loading pins 7 and 8 are slightly returned as described above and the tape 1 is loosened, so that the accident of the tape 1 sticking to the drum 6 is prevented.

[4] In this stop mode state, when the record button is pressed, the trigger pulse TG ₂
(Fig. 4A) is obtained. However, at this point, the recording mode signal REC still remains at "1" and the recording mode is not set.

This trigger pulse TG ₂ passes through the input terminal 38,
It is supplied to the set terminal of flip-flop circuit 40 through NOR gate 39. Therefore, the output of this flip-flop circuit 40 is "0".
This is delayed by a predetermined amount by the delay circuit 41, and the delayed output signal L _ON (J in the same figure) is supplied to the loading circuit 42, whereby the loading pins 7 and 8 are output as shown in FIG. 2E. Return to loading position.

[5] When a time delay corresponding to the time required to complete loading has elapsed, a pulse TG ₃ (FIG. 4A) delayed by the same amount as the trigger pulse TG ₂ is obtained.

[6] This pulse TG ₃ is supplied to the AND gates 23 and 24 through the input terminal 21. At this time, since the recording mode signal REC is in the state of "1", the output A ₂ of the AND gate 24 is
A pulse P ₂ is obtained (Fig. 4K). This pulse P ₂ is supplied to the monostable multivibrator 30 through an inverter 44 , an OR gate 45 , and an inverter 46 .
are supplied to trigger these. Therefore, the brake-off signal B _OFF (L in FIG. 4) is obtained from the monostable multivibrator 30, and at the same time the brake is turned off, the on-signal P _ON (FIG. 4) is generated from the monostable multivibrator 40 for the pinch roller 10. When the image shown in FIG. M) is obtained, the pinch roller 10 is pressed against the capstan 9 side, and the transfer of the tape 1 is started. (See Figure 2F).

Also, at this time, the flip-flop circuit 48 is set by the pulse _P2 , and its output falls to "0". This output is the playback mode signal PB (N in the same figure), and the device
During the period when PB is "0", it is in the playback mode.
Therefore, as the tape 1 is transported, the control signal is reproduced.

[7] The reproduction mode signal PB is supplied to the enable terminal of the counter 49, so that the counter 49 can count while the signal PB is "0". Further, this counter 49 is cleared by a pulse _P2 , and a reproduction control pulse _CTP (FIG. 5F) is supplied to its clock terminal through an input terminal 51. Therefore, when the transfer of tape 1 is started, the playback control pulse C _P is applied to the counter 4.
It counts as 9. Then, when the pulse C _P is counted, for example, by seven pulses, which is less than the tape return amount, the output C ₇ (O in the figure) falls to "0". This output C ₇ is supplied to the monostable multivibrator 20 through the OR gate 26 and the inverter 27, and is also supplied to the OR gate 31.
and is supplied to the monostable multivibrator 50 through the inverter 32, and the monostable multivibrators 20 and 50 are triggered by the fall of the output _C7 , and the outputs B _ON and P _OFF (G and H in the same figure) become "0". The brake is turned on and the pinch roller 10 is turned off. In other words, pause.

Note that the flip-flop circuit 48 is reset by the fall of the output _C7 of the counter 49, and its output signal PB rises to "1".
Enters non-playback mode. And this signal
When PB rises to "1", the counter 49 becomes unable to count.

The stop position in this temporary stop state is a fixed position because the brake-on timing is the seventh regeneration control pulse C _P.

[8] In this pause state, synchronize with the control signal to be recorded and enter the recording state.

That is, in this example, the counter 49
The fall of the output C ₇ is slightly delayed by the monostable multivibrator 52. The delay time by the monostable multivibrator 52 takes into consideration the rise time of the recording phase servo which synchronizes the rotational phase of the rotary head with the phase of the vertical synchronization signal in the video signal to be recorded. The delayed output from the monostable multivibrator 52 is supplied to the set terminal of the flip-flop circuit 53, which is set, and its output F _O (P in the figure) rises to "1". In addition, input terminal 2
The control signal _CTR to be recorded from 9 is supplied to the reset terminal of this flip-flop circuit 53 and reset, and its output F _O becomes "0".
stand down. Therefore, the falling edge of this output F _O is synchronized with the recording control signal _CTR .

The fall of this output F _O is OR gate 45
After passing through the inverters 46 and 47 respectively
is supplied to the monostable multivibrators 30 and 40 through which the monostable multivibrators 30 and 40 are triggered. Therefore, the signal B _OFF and the signal P _ON (L and M in the figure) fall to "0", the brake is turned off, and the pinch roller 10 is turned on, and the tape 1 is turned on.
is transferred again. At the same time, at the falling edge of the signal F _O , the recording mode signal REC (B in the same figure)
falls to "0" and the device enters recording mode. Recording starts as described above.

In this case, after detecting the seventh reproduction control pulse and pausing at the correct timing, the brake is turned off and the pinch roller 10 is stopped at the appropriate timing based on the control pulse to be recorded.
Since the control pulse is turned on, the position of the recording trace of the eighth control pulse and the phase of the control pulse to be recorded can be made to match. That is, since the brake is turned on and the pinch roller 10 is turned off at a timing based on the reproduction control pulse, the stopping position is always approximately a constant distance d _i from the recording trace of the control pulse. On the other hand, since the brake is turned off and the pinch roller 10 is turned on in time with the control pulse to be recorded, the first control pulse is recorded at a certain distance _d2 after the tape 1 starts running.
Therefore, if the sum of distances d ₁ and d ₂ is mechanically set to be equal to the control signal recording pitch τ or 2τ, the control signal recording trace will be at the correct pitch τ even at the joint.
becomes. In other words, the reproduction servo is not disturbed at this joint.

In this way, it is possible to continue recording from stop mode.

Not only can you record continuously from stop mode, but you can also record continuously from pause mode.

That is, in this example, the trigger pulse TG ₁
is obtained by turning on the pause button, the pause state does not occur in the above-mentioned state [3]', but progresses to the state [4] and becomes the pause state.

That is, in this pause mode, the stop mode signal STP is in the state of "1", so
The AND gate 54 is in an open state. Therefore, in the operating state [3]', the unloading state occurs, and the loading pins 7 and 8 return slightly, and the loading end detection signal LE falls to "0". When L _OFF rises to "1", this rising pulse is supplied to the NOR gate 39 through this AND gate 54, so
When the output _LOFF rises, the flip-flop circuit 40 is set and its output falls. Therefore, since the delayed output L _ON falls, the loading pins 7 and 8 return to their loading positions. Therefore, in this pause mode, the loading pins 7 and 8 return slightly from the loading position so as to loosen the tape 1, and at that time, the tension arm 11 moves the tape 10 for 10 control pulses. is pulled back and then moves to return to its original loading position.

When the loading pins 7 and 8 return to their loading positions, the loading end detection signal LE rises to "1" and is supplied to the reset terminal of the flip-flop circuit 40 via the delay circuit 37 and inverter 43. This is reset in the same way as described above.

The above results in a pause state. Then, when you turn off the pause button to cancel this pause state, the second trigger pulse TG ₃ (fourth trigger pulse) obtained when you turn on the record button from stop mode
Something similar to Figure A) is obtained, and this is the input terminal 21
When the signal is supplied through the recording medium, the operation in [6] described above is entered, and the recording state is entered in the same manner.
Naturally, at this time, the trigger pulse TG ₂
does not occur.

Although the above has been explained with reference to the system diagram shown in FIG. 3, all of the above operations can be performed by a microcomputer without using a device like that shown in FIG.

Note that the means for mechanically returning the tape by a predetermined amount when it is placed in stop mode or pause mode is not limited to the example shown in the figure, but as in the example shown in the figure, it is possible to stop the reels 2 and 3 and return the tape by a capstan. According to the method, the tape is further transported while recording the control signal for a period corresponding to 10 recording control signals to form slack in the tape, and the slack is pulled back using a tension regulator. , there is the advantage that it is relatively easy to correctly pull back an amount of tape equivalent to 10 control pulses. Furthermore, when pulling back the tape, the loading pins 7 and 8 are slightly returned to loosen the tape as shown in the example shown in the figure, which has the advantage that the tape can be easily pulled back by the tension arm.

Furthermore, if the running and stopping of the tape is controlled by controlling the supply signals to the solenoids of the reel brake plunger and the pinch roller plunger, as shown in the example in the figure, the splicing device can This can be realized very easily.

Effects of the Invention As described above, in the present invention, when recording from a tape stop state such as a pause state or a stop state, the playback control that can be obtained at this time by temporarily setting the playback mode prior to recording. Since the tape is stopped temporarily using a pulse, and then the tape is started running and recording is restarted using a recording control pulse, the pitch of the control pulse at the joint can be set to the correct pitch. , allows for good splice recording.

Further, in the case of this invention, the tape is temporarily stopped by running the tape slightly from the stopped state, and control is performed to adjust the pitch of the control pulse to the correct pitch during this pause, so that continuous recording from the stop mode is performed. It becomes possible.

Furthermore, even if the tape is replaced, continuous recording can be smoothly performed from the previously recorded portion on the replaced tape. This is because, in this case as well, the recording state is entered after passing through the operating states [5], [6], [7], and [8] described above.

Furthermore, since this invention does not match the phase of the recorded trace of a control signal by applying a reproduction servo using a reproduction control pulse, it has the feature that it can be applied to equipment that does not have a reproduction servo circuit, such as a recording-only machine. be.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a recording track pattern on a tape by a helical scan type VTR, FIG. 2 is a diagram showing a tape running system for explaining the method and apparatus of this invention, and FIG. An example of a system diagram, FIG. 4, is a time chart for explaining the system. 1 is a tape, 2 is a supply reel, 3 is a take-up reel, 4 and 5 are brake shoes, 6 is a drum, 7
and 8 is the loading pin, 9 is the capstan,
10 is a pinch roller, 11 is a pin attached to the tension arm, and 12 is a fixed head for control signals.

Claims (1)

[Scope of Claims] 1. A rotary head is used to record an information signal on a tape at predetermined time intervals by forming one diagonal track, and a fixed head is used to record an information signal on the tape onto the information signal track. Relatedly, in a device that records control pulses at a predetermined pitch, when a trigger to enter a recording state occurs,
Prior to the recording mode, the control pulse is once reproduced in the reproduction mode, the tape running is temporarily stopped at the timing of the reproduction control pulse, and the tape is then run at the timing of the control pulse to be recorded. A method for recording an information signal in which a recording mode is set at the same time as the recording mode. 2. A rotating head is used to record information signals on the tape at predetermined time intervals, forming one diagonal track, and a fixed head is used to record information signals on the tape at a predetermined pitch in relation to the information signal track. In an apparatus for recording control pulses, means for generating a first trigger pulse for stopping the running of the tape in a recording state;
means for mechanically stopping the tape in a state where it has been returned by n pitches of the recording control pulse based on the first trigger pulse; and means for generating a second trigger pulse to change the tape from the stopped state to the recording state. , means for starting the running of the tape from the time of the second trigger pulse, and means for starting the running of the tape from the time of the second trigger pulse;
- means for setting the playback mode to m (n>m) pitches;
means for detecting the n-mth reproduction control pulse in the reproduction mode and temporarily stopping the running of the tape based on the detected output; An information signal recording apparatus comprising means for running the tape and placing it in a recording mode.