JPH051540B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a magnetic recording and reproducing device (hereinafter referred to as "VTR").
The present invention relates to a VTR in which the recording format of the magnetic tape is not disturbed at the joint of recording, particularly when restarting recording after a pause during recording (i.e., when continuous shooting).

[Prior art] In conventional VTRs, a plurality of pilot signals (usually four types) with different frequencies are superimposed on a video signal and recorded on a video track on a magnetic tape, and during playback, tape running is controlled based on these pilot signals. is being carried out.

Figure 1 shows this type of pilot signal system.
1 is a block diagram schematically showing a conventional splicing control means for synchronizing the tape advance and the restart of recording by the recording head using a cue track during splicing on a VTR. In the figure, a pulse signal output from a reference signal generator 1 is recorded on a queue track of a magnetic tape 13 via a gate circuit 2, an amplifier 3, a recording/reproduction changeover switch 4, a capacitor 14, and a queue head 5. The pulse signal of the reference signal generator is also given to the control circuit 8, and the control circuit 8 opens and closes the gate circuit 2 and operates the changeover switch 4 in relation to the pulse signal. The pulse signal regenerated by the queue head 5 is transferred to a capacitor 14, a changeover switch 4,
The signal is inputted to a control circuit 8 via an amplifier 6 and a waveform shaping circuit 7. From the recording/playback system 10, a signal to temporarily stop recording, a signal to start recording restart preparation operation, and a reproduced pilot signal are given to the control circuit 8, and from the control circuit 8 to the recording/playback system 10, signals are sent to the recording head to resume recording. timing signals etc. are given. The control circuit 8 also controls the running of the tape 13 via a servo circuit 11 and a capstan motor 12.

The operation of the conventional continuous shooting control means configured as described above will be explained below with reference to FIG.

FIG. 2 is a diagram schematically showing the recording format of a magnetic tape. In the figure, F ₁ , F ₂ , F ₃ ,
_F4 indicates a video track in which four types of pilot signals, each having a different frequency, are periodically superimposed and recorded sequentially from left to right. in this case,
The magnetic tape 13 moves from left to right when running in the forward direction, and moves from right to left when running in the reverse direction. The queue head 5 schematically shown is dedicated to recording and reproducing queue tracks along the edges of the magnetic tape 13. Now, if a pause signal is given to the control circuit 8 from the recording/playback system 10, the control circuit 8 will control the cap that issued the stop command to the servo circuit 11 after the recording of the last video track being recorded at that time is completed. Tape feeding of the stun motor 12 is stopped. FIG. 2a shows an example of the tape format at the time of this stop. Next, the control circuit 8 issues a reverse running command to the servo circuit 11 to reverse the capstan motor, and the magnetic tape 13
run in the opposite direction by a predetermined distance. Simultaneously with this reverse running command, the control circuit 8 opens the gate of the gate circuit 2 and sets the recording/reproducing switch 4 to the recording side. Therefore, the pulse signal from the reference signal generator 1 is passed through the amplifier and the capacitor 14 to the cue head 5 and the cue track 2.
recorded on 0. The control circuit 8 closes the gate circuit 2 when a predetermined number of pulses of one or more (three pulses in this case) are recorded. After that, the control circuit 8 stops the magnetic tape 13 via the servo circuit 11 and the capstan motor 12 after the magnetic tape 13 has traveled in the reverse direction by the predetermined amount described above, and stands by in preparation for forward travel when the next recording is resumed. let Figure 2b shows an example of the tape in this standby state, and shows the 3rd time recorded when the tape is running in reverse.
Two pulse signals 21 are recorded on cue track 20.

Next, the recording preparation operation at the time of restarting recording will be explained. When a recording preparation operation start signal is given to the control circuit 8 from the recording and playback system 10, the control circuit 8 starts running the tape 13 in the forward direction via the servo circuit 11 and the capstan motor 12, and also starts the playback magnetic head. The tape drive is controlled in response to the pilot signal reproduced by the tape controller. At the same time, the control circuit 8 sets the regeneration selector switch 4 to the regeneration side, and switches the queue head 5 and the capacitor 1.
4. The number of pulse signals 21 reproduced through the amplifier 6 and the waveform shaping circuit 7 is counted. Figure 2c
2 is a diagram showing a state in which the cue head 5 is reproducing the pulse signal 21. FIG. When the number of counted pulse signals reaches the predetermined number (3 in the figure), the recording preparation operation is completed, and the control circuit 8 sends a timing signal for restarting recording of the recording head to the recording/reproducing system 10. and recording will resume. Figure 2d shows the queue head 5 when this recording preparation operation is completed.
and indicates the state of the tape, and then a pilot signal F ₂ is sent to the first video track 22 when recording is resumed.
The superimposed video signal is recorded by a recording magnetic head. Thereafter, recording continues using normal recording operations.

Since the VTR is configured as described above using the conventional pilot signal system for continuous shooting using cue tracks, problems may occur if, for example, continuous shooting is repeated several times within a short period of time. This is the case when the pulse signal recorded at the previous pause remains in front of the cue head in the forward direction, as shown by the dotted line 23 in FIG. 2b, when the tape is on standby. In other words, in the recording of pulse signals when the tape is running in reverse, in the overwrite portion of the pulse signals, for example, even if a previous pulse signal has been recorded, the previous pulse signal is erased.
After the completion of recording a predetermined number of pulse signals, the previous pulse signals in the non-overwritten portion are not erased and remain as they are. In the preparation operation for resuming recording in such a case, the previous remaining pulse signals are counted, so the predetermined number of pulse signals recorded this time is counted, for example, as shown in FIG. A drawback arises in that recording is restarted when the current condition is reached.

[Summary of the Invention] An object of the present invention is to eliminate the above-mentioned disadvantages of continuous shooting in conventional VTRs, and to provide a VTR that can accurately connect the previously recorded video to the final video. It is.

The present invention is characterized by: a recording magnetic head for recording on a video track of a magnetic tape; a tape running control means for running the magnetic tape; a reference signal generator for generating a reference pulse signal;
A magnetic recording/reproducing device comprising a cue head for recording and reproducing the pulse signal using a cue track section of the tape, wherein recording in the recording magnetic head is stopped when recording is paused in a recording mode. while running the tape in the opposite direction from the stopped position while recording at least one or more predetermined number of pulse signals on the cue track by the cue head, and then stopping the tape. When the paused recording is restarted, the tape being held in standby is run in the forward direction and the recorded pulse signals are played back by the cue head, and the number of the played pulse signals is In a magnetic recording/playback device in which the recording of the recording magnetic head is recovered and recording is restarted when the number matches the number of recorded pulse signals, recording of the predetermined number of pulse signals when the tape runs in a reverse direction. The present invention further comprises means for causing the tape running control means to continue running the tape in the reverse direction for a predetermined period of time after the end of recording of the pulse signal, and erasing the cue track after the end of recording of the pulse signal for the predetermined period. .

[Embodiment of the Invention] FIG. 3 is a schematic block diagram showing an embodiment of the invention. In the figure, the erasure signal generator 25 is
A high frequency erase signal is generated which is applied to the cue head 5 to erase the previous pulse signal remaining on the cue track. The gate circuit 2' receives the pulse signal from the reference signal generator 1 or the erase signal generator 25 when necessary according to the command of the control circuit 8.
This is to selectively pass one of the erase signals from. The other components are the same as those in FIG. 1, and corresponding parts are given the same reference numerals.

The operation of the continuous shooting control means according to the present invention configured as described above will be explained. Among the operations, the operations up to recording a predetermined number of pulse signals at the time of temporary stop are the same as those described for the case of FIG. However, in the embodiment shown in FIG. 3, when the recording of a predetermined number of pulse signals is completed, the gate circuit 2' receives a command from the control circuit 8 and closes the gate of the pulse signal from the reference signal generator 1. At the same time, the gate of the erase signal from the erase signal generator 25 is opened. After the recording of the pulse signal is completed, the magnetic tape continues running in the reverse direction for a predetermined period while the cue track is being erased, and then stops and enters a standby state. Therefore,
According to this embodiment, since there is no residual pulse signal 23 as shown in FIG. 2b, there is no need to worry about malfunctions occurring when recording is resumed as described above. The recording resume preparation operation is the same as the explanation with respect to FIG. 1, so the explanation will be omitted.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a VTR that can accurately connect to the final video of the video recorded previously when performing continuous shooting.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing continuous shooting control means in a conventional VTR. FIG. 2 is a diagram schematically showing the recording format and queue head of a magnetic tape. FIG. 3 is a schematic block diagram showing continuous shooting control means in a VTR according to an embodiment of the present invention. In the figure, 1 is a reference signal generator, 2 and 2' are gate circuits, 3 is an amplifier, 4 is a recording/reproduction changeover switch, 5 is a queue head, 6 is an amplifier, and 7
1 is a waveform shaping circuit, 8 is a control circuit, 10 is a recording/playback system, 11 is a servo circuit, 12 is a capstan motor, 13 is a magnetic tape, 14 is a capacitor, 20
21 is a cue track, 21 is a recorded pulse signal, and 23 is a remaining pulse signal. Note that in each figure, the same reference numerals indicate the same parts or the same contents.

Claims (1)

[Scope of Claims] 1. A recording magnetic head for recording a video track on a magnetic tape, a tape running control means for running the magnetic tape, a reference pulse generator for generating a reference pulse signal, and a reference pulse generator for generating a reference pulse signal. A magnetic recording/reproducing device comprising a cue head for recording and reproducing using the cue track section of the tape, wherein when recording is paused in a recording mode, the recording magnetic head is in a state where recording is stopped. The tape is caused to run in the opposite direction from the stopped position, and at least one or more predetermined number of pulse signals are recorded on the cue track by the cue head, and then the tape is stopped and put on standby; When restarting the paused recording, the tape kept in standby is run in the forward direction and the recorded pulse signals are played back by the cue head, and the number of the played pulse signals is equal to the number of the recorded pulse signals. In a magnetic recording/playback device in which the recording of the recording magnetic head is recovered and recording is restarted when the number of pulse signals matches the number of pulse signals, after recording of the predetermined number of pulse signals ends when the tape is running in the reverse direction. The tape is caused to continue running in the reverse direction by the tape running control means for a predetermined period of time, and the cue track after the end of recording of the pulse signal is erased for the predetermined period of time, and then the tape is stopped and placed on standby. A magnetic recording and reproducing device characterized in that it is equipped with cue track erasing means. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein said queue track erasing means includes an erasure signal generator for supplying a high frequency erasure signal to said queue head. 3. The apparatus according to claim 2, further comprising signal switching means for selectively applying either the pulse signal or the erase signal to the cue head when the tape runs in the reverse direction. Magnetic recording and playback device. 4. The magnetic recording and reproducing apparatus according to claim 3, wherein the signal switching means is a gate circuit. 5. The recording magnetic head records a video signal on which a plurality of pilot signals having different frequencies are superimposed, and the recorded pilot signal is changed and periodically repeated for each track of the video track, Further, the magnetic recording and reproducing apparatus includes a reproducing magnetic head for reproducing the recorded signal of the video track, and the tape running control means also controls the tape traveling based on the pilot signal reproduced by the reproducing magnetic head. A magnetic recording and reproducing apparatus according to any one of claims 1 to 4, characterized in that: 6. At the time of resuming recording, the tape kept in standby is run in the forward direction, and at the same time, the phase of the frequency of the reproducing pilot signal reproduced by the reproducing magnetic head and the pilot signal newly recorded after resuming recording are adjusted. 6. The magnetic recording and reproducing apparatus according to claim 5, wherein the magnetic recording and reproducing apparatus has the same phase.