JPH06150468A - Consecutive recording system - Google Patents

Abstract

PURPOSE:To quicken the restart of recording operation without disturbing a joint by transferring a tape by a prescribed amount in a forward direction after the tape is transferred by the prescribed amount in a backward direction in a temporary stop mode at a consecutive recording time and stopping the tape in a position locking the phase of a capstan motor in the shortest time. CONSTITUTION:The capstan motor is stopped in the case of moving from a recording mode I to a temporary stop state. A motor is reversed and the magnetic tape is transferred in a backward direction (unwinding II). At this time, the tape is transferred by the prescribed amount by counting a capstan FG signal. The motor is stopped temporarily again, and the tape is transferred by the prescribed amount in a forward direction (forward winding III). The amount is measured by counting the capstan FG signal. The tape 100 is fed frame by several frames in a forward direction. At this time, the tape position where a regenerative phase matching time is made minimum is selected. When the temporary stop state of the tape 100 is released, the motor 12 is rotated forward, and the rotation phase control of the motor 12 is performed by making a regenerative control signal obtained by running the tape 100 a feedback signal (regenerative phase matching V).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus and, more particularly, to a connection system for continuously recording a signal after a pause mode is set during recording.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional example of a servo circuit of a magnetic recording / reproducing apparatus. The servo circuit of the cylinder motor 1 that rotates the cylinder 29 uses the signals output from the frequency generator FG1 and the pulse generator PG as detection signals, and the frequency of the FG signal generated from the frequency generator FG1 becomes constant. As described above, the speed of the cylinder motor 1 is controlled, and the rotation phase of the cylinder motor is controlled by the pulse generated from the pulse generator PG.

The FG signal generated from the frequency generator FG1 is amplified by the FG amplifier 2, then frequency-divided by the frequency divider 3 and input to the velocity detector 4. On the other hand, the PG pulse output from the pulse generator PG is input to the phase detector 6 via the monostable multivibrator 5. The velocity detector 4 detects the input divided FG signal and outputs its output to the adder 8 via the filter 7, and the phase detector 6 detects the input PG signal and outputs its output to the filter 9 To the adder 8 via. The adder 8 mixes the two detection signals to create a mixed control signal. This control signal is sent to the cylinder motor drive amplifier 1 via the filter 10.
Input to 1. The cylinder motor drive amplifier 11 drives the cylinder motor 1 by amplifying the control signal input from the filter 10 and sending the amplified control signal to the cylinder motor 1. As a reference signal for controlling the phase of the cylinder motor 1, at the time of recording, the vertical synchronizing signal separated from the video signal by the synchronizing separating circuit 26 is divided into 1/2 by the frequency divider 27 and this divided signal is switched. 28 is used by turning it on, and the switch 28 is turned off at the time of reproduction to use an independent reference signal.

The same applies to the servo circuit of the capstan motor 12, and the frequency of the FG signal generated from the frequency generator FG2 is constant by using the signals generated from the frequency generator FG2 and the control head 13. As described above, the speed control of the capstan motor 12 is performed, and the phase control is performed on the basis of the signal obtained by dividing the FG signal by the frequency divider 25 at the time of recording, and at the time of reproduction, the reproduction control reproduced by the control head 13 is performed. Do it using signals. That is, the FG signal generated by the frequency generator FG2 is amplified by the FG amplifier 14, then frequency-divided by the frequency divider 15, and then input to the velocity detector 16. On the other hand, the reproduction control signal reproduced by the control head 13 is amplified by the amplifier 17 and then input to the terminal b of the switch 18, and during reproduction, is input to the phase detector 19 via the switch 18.

The speed detector 16 detects the input divided FG signal and outputs the detected output to the adder 21 via the filter 20. The phase detector 19 detects the reproduction control signal input via the switch 18, and outputs the detected output to the adder 21 via the filter 22. The adder 21 mixes both detection signals output from the filters 20 and 22 into a control signal, which is output to the capstan motor drive amplifier 24 via the filter 23. The capstan motor drive amplifier 24 outputs the input control signal to the capstan motor 12 to drive this motor. The frequency divider 25 divides the frequency of the FG signal output from the FG amplifier 14 during recording and outputs it to the terminal a of the switch 18. Therefore, the divided FG signal is transmitted to the switch 18
The frequency-divided FG signal is used as a reference signal of the phase signal by being input to the phase detector 19 via.

FIG. 6 is a diagram showing a recording state of a magnetic tape when a signal is recorded by a helical scan type magnetic recording / reproducing apparatus having the above-mentioned servo circuit. On the magnetic tape 100, a video track V is normally recorded diagonally in units of one field, and a control signal CTL is recorded at regular intervals in the tape running direction. The control signal CTL is used as a reference signal in the capstan motor control system shown in FIG. 5 so that the video head 30 can accurately scan the video track at the reproduction position. Normally, the control signal CTL is generated by dividing the vertical synchronizing signal of the video signal to be recorded by 1/2. Therefore, during reproduction, the control head 13
The magnetic tape of the capstan control system so that the time when the control head detects the control signal CTL coincides with the time when the video head 30 comes near the start end of the video track V (that is, the portion where the vertical synchronizing signal is recorded). Is controlled.

By the way, the magnetic tape 100 may be temporarily stopped at an arbitrary time at the time of signal recording, and the magnetic tape may be started again at an arbitrary timing to immediately start recording. In such a case, the recording phase of the video track V is different at the joint portion of the recording signal, or the inclination angle of the track is changed, so that the reproduced image is disturbed at that portion. When the magnetic tape 100 is temporarily stopped as described above and then recording is started,
The running locus of the video head 28 is as shown by the dotted line in FIG.

In order to prevent the disturbance of the reproduced image due to the joint portion of the recording signals on the magnetic tape described above, the conventional magnetic recording / reproducing apparatus adopts the method shown in FIG. The method is shown. When the "1" temporary stop mode is entered, and (1) the recording mode I is entered into the temporary stop mode, the capstan motor is temporarily stopped. (2) After the tape is stopped, the capstan motor control system reverses the capstan motor to transfer the magnetic tape in the reverse direction (rewind II). (3) After transferring a predetermined amount of magnetic tape in the reverse direction, the capstan motor is temporarily stopped again, and after transferring a predetermined amount (forward winding III) in the forward direction, the apparatus is placed in a standby state. However, the predetermined amount in the positive direction is measured by counting the capstan FG signal.
[2] When the temporary stop mode is released, (1) the capstan motor is normally rotated and the control head 1
Phase control (reproduction phase matching IV) is performed using the control signal reproduced in 3 as a feedback signal. This state is at least the time when the playback control signal is synchronized with the vertical sync signal,
That is, the phase is continuously set for the time required for the phase of the video track recorded immediately before the pause and the phase of the video track to be newly recorded to match. (2) The recording operation (recording mode V) is restarted by switching the not-shown changeover switch to the recording side when the set time has elapsed. At this time, the phase comparison signal of the capstan phase control system is switched from the reproduction control signal to a signal obtained by dividing the capstan FG signal.

As described above, when the stop is released during the signal recording and the recording mode is resumed, the connection of the recording signals is not disturbed. However, it takes about 1 to 1.5 seconds until the capstan motor is activated and the vertical synchronization signal and the reproduction control signal are synchronized after the temporary stop is released. Therefore, since the resuming recording operation at the time of the joint recording is performed after the temporary stop is released, the resuming recording operation can be resumed only after the time required for synchronizing the vertical synchronizing signal and the reproduction control signal has passed. However, there is a drawback that the recording operation cannot be restarted promptly.

[0010]

As described above, in the conventional magnetic recording / reproducing apparatus, when the so-called connecting operation is performed in which the signal is temporarily stopped during recording and the signal recording is restarted, the re-recording operation is temporarily stopped. After the stop is released, and until the rotation phase of the capstan motor stabilizes, about 1 second to 1.
Since it takes a long time of 5 seconds, in order not to disturb the connection of the recording signals, the recording operation can be restarted only after the elapse of this long time, and the re-recording operation at the time of connection can be promptly performed. It had the drawback of not being able to restart.

Therefore, the present invention eliminates the above-mentioned drawbacks, without disturbing the joints of recording signals at the time of connection,
It is an object of the present invention to provide a tie-in method that can quickly restart a recording operation after a pause.

[0012]

SUMMARY OF THE INVENTION According to the present invention, while a signal is being recorded on a tape by a magnetic recording / reproducing apparatus, the running of the tape is once stopped, and then the running of the tape is started to start the signal transfer. In the splicing method for restarting recording, the first step of temporarily stopping the capstan motor from the recording mode to temporarily stop the tape and the reverse direction of the capstan motor to reverse the tape The second step of transferring the tape to a predetermined amount, and again, after temporarily stopping the capstan motor to stop the traveling of the tape, the capstan motor is normally rotated to transfer the tape in the positive direction by the predetermined amount. And a fourth step of setting the stand-by state by stopping the capstan motor after feeding the tape several frame frames in the forward direction, and rotating the capstan motor in the forward direction to move the tape. - Play was obtained by Rukoto control - the Le signal as the feedback signal Kyapusutanmo - a fifth step of performing the rotational phase control of data, the Kyapusutanmo -
After locking the rotational phase control of the tape, a sixth step of restarting the recording operation of the signal to the tape is performed.

[0013]

In the connecting method of the present invention, the first step is to temporarily stop the tape by temporarily stopping the capstan motor from the recording mode. In the second step, the capstan motor is reversed to transfer the tape in the reverse direction by a predetermined amount. The third step is capstan mode again
After temporarily stopping the tape to stop the running of the tape, the capstan motor is rotated in the normal direction to transfer the tape in the forward direction by a predetermined amount. In the fourth step, the tape is forwarded by several frame frames in the positive direction to set the slow-tracking time. In the fifth step, the capstan motor is rotated in the forward direction to run the tape, and the reproduction controller is obtained.
Control signal is used as a feedback signal to control the rotational phase of the capstan motor. In the sixth step, after the rotation phase control of the capstan motor is locked, the recording operation of the signal to the tape is restarted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a time chart showing an embodiment of the frame advancing operation used in the joining method of the present invention.
The operation of moving one frame of the recording track once is called frame advance, and this operation is made up of three sections, a start section a, a constant speed section b, and a brake section c, as shown in FIG. By supplying the current to the capstan motor, the tape changes its speed as shown in FIG. At this time, as shown in FIG. 1C, the section from the detection of the reproduction control signal CTL to the brake section C is called the slow tracking time ST, and the tape can be changed by changing the slow tracking time ST. The position of can be changed to any position. Figure 2
FIG. 2A is a diagram showing a head trace locus during slow reproduction in the standard speed mode when the double azimuth 4-head configuration as shown in FIG. 2B is adopted. Figure 2
The speed of the magnetic tape in the constant velocity section B shown in (A) is close to the tape speed in the reproducing or recording mode, and the phase control of the capstan control system is in a state in which it is easy to lock immediately. In this example, this state is utilized so that the re-recording operation at the time of connection can be promptly performed.

FIG. 3 is a sequence diagram showing an embodiment of the connecting method of the present invention. When shifting from the "1" recording operation to the temporary stop state, (1) the recording mode I is entered into the temporary stop mode, and the capstan motor (not shown) is stopped. (2) After stopping, a capstan motor drive circuit (not shown) reverses the capstan motor to transfer the magnetic tape in the reverse direction (rewind II). At this time, the magnetic tape is transferred by a predetermined amount by counting the capstan FG signal. (3) After the tape is transferred by a predetermined amount in the reverse direction, the capstan motor is temporarily stopped again and further transferred by the predetermined amount in the forward direction (normal winding II
I) The predetermined amount is measured by counting the capstan FG signal. (4) The tape is forwarded by several frames in the forward direction IV (intermittent slow). At this time, the slow-tracking time is set such that the tape position is set so as to minimize the reproduction phase adjustment time required for resuming recording. After the operations of (1) to (4) above are completed, a standby state is entered.

[2] When the temporary stop state of the tape is released, (1) the capstan motor is rotated in the normal direction and the tape is rotated.
The rotation phase control (reproduction phase adjustment V) of the capstan motor is performed by using the reproduction control signal obtained by running the cap as a feedback signal. At this time, the reproduction control signal is synchronized with the vertical synchronization signal in the shortest time by the frame advance operation described in (1) (4). This is because the tape is stopped at a position where the phase of the video track previously recorded and the phase of the video track to be newly recorded after the pause are matched, so after the pause is released, The rotational phase of the capstan motor is locked by simply running the tape for several frames. (2) After the phase control of the capstan control system is locked, a changeover switch (not shown) is switched to the recording side, and signal recording is resumed on the tape running at a constant speed (recording mode VI). At this time, the phase comparison reference signal for controlling the phase of the capstan control system is switched from the reproduction control signal to a signal obtained by dividing the capstan FG signal.

FIG. 4 is a diagram showing a head trace locus at the time of phase matching of the capstan motor in the case where the tape is connected as mentioned above. -The phase of the data is adjusted to the previous phase.

According to this embodiment, at the time of connection, after entering the temporary stop mode and transferring a predetermined amount of tape in the opposite direction,
When transferring a certain amount of tape in the forward direction, set a slow-tracking value to stop the tape at the position where the frame feed operation is performed and the rotation phase of the capstan motor is locked in the shortest time. Therefore, the tape is 30
It is possible to rewind a few frames instead of rewinding for about 45 frames, and then rewind a few frames.
Since the rotational phase of the capstan motor can be locked only by running the tape for a minute, the recording of the signal can be resumed immediately. Therefore, the recording operation of the signal at the time of releasing the pause can be remarkably restarted without disturbing the signal at the joint, and the joint can be performed in a shorter time than the conventional case.

[0019]

As described above, according to the joining method of the present invention, it is possible to quickly resume the recording operation after the pause without disturbing the joint of the recording signals at the joining.

[Brief description of drawings]

FIG. 1 is a time chart showing an embodiment of a frame advancing operation used in a connection removing method of the present invention.

FIG. 2 is a diagram showing a head trace locus at the time of re-recording when the joining method of the present invention is applied and an example of a head configuration at that time.

FIG. 3 is a sequence diagram showing an embodiment of a connection removing system of the present invention.

FIG. 4 is a diagram showing a head trace locus at the time of re-recording when the connection removing method of the present invention is applied.

FIG. 5 is a block diagram showing an example of a servo system of a conventional magnetic recording / reproducing apparatus.

FIG. 6 is a diagram showing an example of a recording pattern when a signal is recorded on a tape by a conventional magnetic recording / reproducing apparatus.

FIG. 7 is a diagram showing a head trace locus at the time of re-recording when the conventional joining method is applied.

[Explanation of symbols]

100 magnetic tape 12 capstan motor 24 capstan motor drive circuit

Claims (1)

[Claims] 1. A connection method for temporarily stopping the running of the tape while the signal is being recorded on the tape by a magnetic recording / reproducing apparatus, and then starting the running of the tape to restart the recording of the signal. In the first step, the capstan motor is temporarily stopped from the recording mode to temporarily stop the tape, and the second step is to reverse the capstan motor to transfer a predetermined amount of the tape in the reverse direction. And a third step of temporarily stopping the capstan motor again to stop the running of the tape, and then rotating the capstan motor in the forward direction to transfer the tape in a positive direction by a predetermined amount. A fourth step of setting the stand-by state by stopping the capstan motor after feeding the tape several frame frames in the forward direction, and rotating the capstan motor in the forward direction to drive the tape. The reclaimed A fifth step of controlling the rotational phase of the capstan motor by using a control signal as a feedback signal; and a step of restarting the recording operation of the signal to the tape after locking the rotational phase control of the capstan motor. A connecting method, which comprises 6 steps.