JPS61177608A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the disturbance of picture joints to make ideal joint recording possibly by restarting the picture recording operation when the number of pulses picked up for forward transportation of a magnetic tape and that for reverse transporting coincide with each other. CONSTITUTION:One or more pulse signals to be recorded on a cue track provided independently of video signal recording tracks are generated by a cue pulse means 11 while transporting the magnetic mode for a certain time in the forward direction when the magnetic tape is stopped temporarily after being transported to the forward direction in the picture recording mode, and these pulse signals are recorded on the cue track by a cue head 10. After this recording, recording of video signals due to a video signal recording head 21 is stopped, and the magnetic tape is transported to the reverse direction for a certain time. A microcomputer 17 counts the number of pulses which the head 10 picks up during this reverse transportation and counts the number of pulses which the head 10 picks up in accordance with the forward running control of the magnetic tape at the temporary stop release time, and the picture recording operation is restarted when both of counted values coincide with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device, and more particularly to a magnetic recording/reproducing device that is improved so that the seams of images on a magnetic tape are not disturbed.

[Prior Art] Conventionally, in magnetic recording and reproducing apparatuses, there have been two methods for controlling the running of a magnetic tape: a method using a control signal and a method using a pilot signal.

First, the control signal control method will be explained.

FIG. 4 is a diagram showing a recording state of a magnetic tape recorded by a helical scan type magnetic recording/reproducing apparatus having a control track separate from a video signal track. In FIG. 4, a video signal track 2 is recorded diagonally on a magnetic tape 1, usually in units of one field, and a control signal (MM3) is recorded at regular intervals in the tape running direction. At times, it is used to illuminate the tape running so that the video signal magnetic head 5 can accurately scan the video signal track 2.

In the following explanation, signals before being recorded on the magnetic tape 1 will be referred to as recording control signals, and signals recorded on the magnetic tape 1 will be referred to as control signals 3. The signal reproduced from the magnetic tape 1 will be referred to as a reproduction control signal J.

Normally, the control signal 3 is created by dividing the vertical synchronization signal of the video signal to be recorded by 1/2.

Therefore, during playback, the time when the control head 6 detects the control signal 3 and the time when the video signal magnetic head 5 comes near the starting end of the video signal track 2 (that is, the part where the vertical synchronization signal is recorded) are different. The running state of the magnetic tape 1 is controlled so that the numbers coincide with each other.

By the way, if the magnetic tape 1 is temporarily stopped at an arbitrary time during recording and then restarted at an arbitrary timing and immediately starts recording, the recording phase of the video signal track 2 may differ at the joint. However, since the inclination angle of the video signal track 2 changes, there is a problem in that the reproduced image in that part becomes distorted. For example, when the magnetic tape 1 is temporarily stopped, the traveling locus of the video signal magnetic head 5 becomes as shown by the dotted line 4 in FIG. 4.

In order to prevent such disturbances at the joints of images, the following operations are performed in the servo control system.

If a pause command is issued during recording, the recording operation is immediately stopped and the magnetic tape 1 is moved a certain amount in the opposite direction. At that point, the transfer of the magnetic tape 1 is stopped and the recording standby state is entered.

Thereafter, when the temporary stop command is released, the magnetic tape 1 starts to be transferred in the forward direction. At this time, the recording operation is not started immediately, but the control signal J reproduced from the control track of the magnetic tape 1 is synchronized with the vertical synchronization signal that serves as a reference for the video signal to be newly recorded.

That is, after matching the phase of the previously recorded video signal track with the phase of the video signal track to be newly recorded, the recording mode is switched and the switching operation is restarted. In this way, continuous shooting is performed so that the connection between the previously recorded III image and the newly recorded image is not disturbed.

Next, a 4f pilot signal 1Sllt11 method will be described as an example of a method using pilot signals.

FIG. 5 is a diagram showing the relationship between video signal tracks formed on the magnetic tape 7 so as to be inclined in the longitudinal direction of the tape, and pilot signals recorded on each video signal track in a superimposed manner with the video signal. .

In FIG. 5, video signal track F I + F 2
*Fa and Fa are frequencies fl+f2. '@＊
This indicates that the r4 pilot signal is recorded in a superimposed manner. These frequencies are Ifz-r, 1=
lf , -f , lf, , lf l-1゜1 ””
l'2-'a I-f>, r a
≠' I am satisfied with bnoI.

Here, for example, as shown in FIG.
is the video signal track F on the magnetic tape 7.

If we consider the case where the magnetic head 8 is tracking
In addition to the pilot signal of frequency t superimposed on the video signal track F, the pilot signal component detected by The pilot signal superimposed on F, ) is also included at the same time. and,
The magnitude of the pilot signals detected from these adjacent tracks increases as the positional deviation from the center of the video signal track being tracked by the magnetic head 8 increases. As a result, 1rz−r+l
The magnitude of -IF5-1'+l is converted into a voltage, and the direction of the positional deviation from the center of the video signal track is detected based on the magnitude, and the tooth of the positional deviation from the center of the video signal track is detected using the difference component. . These detected error components are fed back to the servo control system to control the running of the magnetic tape 7.

[Problems to be Solved by the Invention] By the way, Mr. G, in the above-mentioned magnetic recording and reproducing device using the signal control method, there is no function that allows continuous shooting to prevent the joints of images from being disturbed. There were drawbacks.

Therefore, the main object of the present invention is to provide a magnetic recording and reproducing device which is improved so as to be able to transition from a recording mode to a pause mode and then to a recording mode without disturbing the image transitions. That's true.

[Means for Solving the Problems] The present invention is configured as follows in order to perform continuous shooting so that the joints of images are not disturbed. That is,
In the present invention, in the recording mode a5, the tape running control means transports the magnetic tape in the forward direction based on the forward transport signal generated by the forward transport signal generating means. and,
When the magnetic tape is temporarily stopped, the magnetic tape is transported in the forward direction for a certain period of time, and at least one pulse signal to be recorded on a cue track provided separately from the video signal recording track is generated from the cue pulse generating means. , recorded on the cue track by the cue head. After recording the pulse signal on the cue track, the recording control means stops recording the video signal by the video signal recording head, and the tape running means receives the reverse direction transfer signal generated from the reverse direction transfer signal generation means. The magnetic tape is transported in the opposite direction for a certain period of time based on the . At this time, the number of pulse signals picked up from the cue head is counted by the first pulse counting means. At the time of canceling the pause, the number of pulse signals picked up by the cue head is counted by the second pulse counting means in response to the fact that the magnetic tape is running in the forward direction, and the counted value is M.
When the count value of the pulse counting means 1 matches the count value of the pulse counting means 1, the recording operation is restarted.

[Operation] In the recording mode, the present invention records one or more cue pulses on the cue track while moving the magnetic tape a certain amount in the forward direction during pause, and then moves the magnetic tape in the reverse direction for a certain period of time. At this time, the number of cue pulses that have already been recorded is picked up and counted, and when the pause is released and recording is started, the magnetic tape is transferred in the forward direction and the pulses recorded on the cue track are counted. The recording operation is restarted when the number of pulses picked up matches the number of pulses picked up when the magnetic tape was transferred backwards.

[Embodiment] FIG. 1 is a schematic block diagram showing an embodiment of the present invention. First, the electrical configuration of an embodiment of the present invention will be described with reference to FIG. The signal circuit 25 outputs a video signal to be recorded on a magnetic tape, and the output of this signal circuit 25 is connected to the mixer circuit 24. The mixer circuit 24 mixes the pilot signal output from the servo circuit 18 and the video signal from the signal circuit 25. It is connected to the signal magnetic head 21. The signal circuit 25, the mixer circuit 24, the recording/reproducing switch 26, the video signal magnet, and the head 21 constitute a video signal recording circuit.

The servo circuit 18 controls a capstan motor 19 and a reel motor 20 that control the running of the magnetic tape, and is connected to a mixer circuit 24.

During recording, the video signal output from the signal circuit 25 is sent to the servo circuit 18 by the mixer circuit 24.
The pilot signal outputted from the recording/reproducing switch 26 is guided to the video signal magnetic head 21 provided on the rotating drum, and recorded on the video signal track on the magnetic tape.

The video signal magnetic head 21 also has a recording/reproducing switch 2.
6 to the amplifier 22. The output of amplifier 22 is connected to filter 23 . The filter 23 separates the video signal and the pilot signal, and provides the pilot signal to the servo circuit 18 and the video signal to the signal circuit 2.
Give to 5.

The video signal magnetic head 21, the recording/reproducing switch 26, the amplifier 22, the filter 23, and the signal circuit 25 constitute a video signal reproducing circuit. That is, during reproduction, the video signal and pilot signal picked up from the video signal track by the video signal magnetic head 21 are input to the amplifier 22 via the recording/reproduction switch 26 and amplified. The output of the amplifier 22 is applied to a filter 23, which separates the video signal and the pilot signal, the pilot signal is applied to the servo circuit 18, and the signal 1' is applied to the signal circuit 25.

A reference frequency signal generator 11 generates pulses to be recorded on a cue track of a magnetic tape, and the output of this reference frequency signal generator 11 is connected to a gate circuit 12 and a microcomputer 17. This microcomputer 17 controls the entire operation of the magnetic recording/reproducing apparatus, and is constituted by, for example, a one-chip microcomputer in which a ROM, a RAM, and an input/output board are integrated. The gate circuit 12 gates the pulses generated from the reference frequency signal generator 11,
This controls the number of pulses to be recorded on the cue track. Therefore, a gate signal is given to the gate circuit 12 from the microcomputer 17. Gate circuit 12
The output of is connected to amplifier 13.

The amplifier 313 amplifies the pulse, and the output of this amplifier 13 is connected to the recording/reproducing cue head 10 via the recording/reproducing switch 14.

Therefore, the reference frequency signal generator 11 and the gate circuit 1
2, the amplifier 13, the recording/reproduction switch 14, and the cue head 10 constitute a circuit for recording pulses on the cue track. In addition, the microcomputer 17 generates a reference frequency signal! The number of pulses generated from 111 is counted.

The cue head 10 is connected to the input of the amplifier W15 via the recording/reproducing switch 14. This amplifier 15 amplifies the pulses picked up from the magnetic tape by the cue head 10.

The output of this amplifier 15 is connected to the input of a waveform shaping circuit 16. This waveform shaping circuit 16 shapes the waveform of the pulse amplified by the amplifier 15.

The output of the waveform shaping circuit 16 is connected to a microcomputer 17. Therefore, the cue head 10, the recording/reproducing switch 14, the amplifier 15, and the waveform shaping circuit 16 constitute a circuit that reproduces the pulses recorded on the cue track.

Furthermore, the microcomputer 17 includes a servo circuit 1
8. Recording/playback switch 14 and recording/playback switch 26
is connected. The microcomputer 17 provides various command signals to a servo circuit 18 that controls the running of the magnetic tape, and outputs command signals for switching the recording/reproducing switch 14 and the recording/reproducing switch 26, respectively.

Note that the microcomputer 17 has a temporary stop signal 27.
and head switching signal 28 are applied. The temporary stop signal is a toggle operation, and once the temporary stop signal is input, the temporary stop mode is set, and when the temporary stop signal is input again, the temporary stop mode is canceled. In addition, the reference frequency signal is generated! The pulses generated from 111 are synchronized with the head switching signal 28.

FIG. 2 is a diagram showing the recording state of signals on a magnetic tape in order to explain the operation of the embodiment of the present invention shown in FIG. 1, and FIG. FIG.

Next, with reference to FIGS. 1 to 3, a specific operation of an embodiment of the present invention will be described.

Assuming that recording is currently in progress, the second
As shown in Figure (a), bit signals of T and frequencies 1cf+, lz, rs, and rn are circulated and recorded by the video signal magnetic head 21, superimposed on the video signal.

In this state, when the temporary stop signal 27 is input to the microcomputer 17, the microcomputer 17 determines whether or not the temporary stop signal 27 is input. When the microcomputer 17 determines that the temporary stop signal 27 has been input, it determines whether or not it is in the temporary stop mode. If the mode is not the temporary stop mode, it is determined whether the polarity of the head switching signal 28 has been reversed. That is, after the recording to the video signal track that is currently being recorded is finished, it is determined whether or not the next head switching signal 28 has been input.

When it is determined that the polarity of the head switching signal 28 has been reversed, that is, that the next head switching signal 28 has been input, it outputs a command signal to the gate circuit 12 to open the gate. In response, the gate circuit 12 opens the gate and provides the pulse signal output from the reference frequency signal generator 11 to the amplifier 13.

At this time, the microcomputer 17 switches the recording/reproducing switch 14 to the recording side. Amplifier 13 is gate circuit 1
The pulse outputted from 2 is applied to the cue head 10 via the recording/reproducing switch 14. The cue head 10 is
The pulse is recorded on the cue track 50. In addition,
In this embodiment, the reference frequency signal generator 11 generates pulses with a reference frequency of 60 Hz, and three of these pulses are recorded on the cue track.

The microcomputer 17 is a reference frequency signal generator 11
The number of pulses is counted and it is determined whether the number of pulses has reached three. When it is determined that the number of recorded pulses has reached three, a command signal is given to the gate circuit 12 to close the gate. Accordingly, the gate circuit 12 closes its gate when three pulses are output from the reference frequency signal generator 11. Then, the microcomputer 17 switches the recording/reproducing switches 14 and 26 to the reproducing side. Thereby, recording of pulses on the cue track 50 and recording of video signals on the video signal track are respectively stopped. The magnetic tape in this state is as shown in FIG. 2(b).

The microcomputer 17 starts measuring time using a transfer amount setting timer for the magnetic tape 7. Note that this transition feed rate setting timer is configured by a program. Further, the CPU 17 provides a command signal to the servo circuit 18 for rotating the capstan motor 19 and the reel motor 20 in opposite directions. Accordingly, servo circuit 1
8 rotates the capstan motor 19 and reel motor 20 in opposite directions to transport the magnetic tape 7 in the opposite direction. During the reverse transfer of the magnetic tape 7, the recording/reproducing switch 1
．． 4 and 26 are respectively switched to the reproduction side. When the magnetic tape 7 starts to be transported in the reverse direction, the pulse signal recorded on the cue track 50 is picked up by the cue head 10, and the pulse signal recorded on the cue track 50 is picked up by the cue head 10, and the recording/reproduction switch 14 is picked up by the cue head 10.
is applied to amplifier 15 via. The amplifier 15 amplifies the pulse signal and supplies it to the waveform shaping circuit 16. The waveform shaping circuit 16 shapes the waveform of the pulse signal and supplies it to the microcomputer 17. The microcomputer 17 counts the number of pulse signals picked up after the magnetic tape 7 is transported in the reverse direction. Therefore, the microcomputer 17 constitutes the first pulse counting means.

The microcomputer 17 counts the pulse signals picked up from the cue track 50 and determines whether the transition feed rate setting timer of the magnetic tape 7 has counted a predetermined time. If the predetermined time has elapsed, a command signal is given to the servo circuit 18 to stop the rotation of the capstan motor 19 and the reel motor 20. In response, the servo circuit 18 stops the reverse rotation of the capstan motor 19 and reel motor 20. at the same time,
The microcomputer 17 stops counting the reproduction pulses from the cue track 50.

By carrying out the above-described operations, when the magnetic tape 7 has been transferred a certain amount in the opposite direction, the transfer of the magnetic tape 7 is stopped and the recording standby state is entered. The recording state on the magnetic tape 7 at this time is as shown in FIG. 2(C). In addition, 51 shown in FIG. 2(C) shows the state of the pulses recorded on the cue track 50, and one pulse previously recorded and the pause signal 2 are shown.
3 newly recorded pulses when 7 was input, total 4
This is the state in which pulses are counted.

Next, when the pause signal 27 is input again and the recording temporary standby state is canceled, the microcomputer 17 sends a command signal to the servo circuit 18 to rotate the capstan motor 19 and the reel motor 20 in the forward direction. give to Accordingly, the servo circuit 18 connects the capstan motor 19
Then, the reel motor 20 is rotated in the forward direction to transport the magnetic tape 7 in the forward direction. At this time, the video signal magnetic head 21 picks up the pilot signal recorded on the magnetic tape 7 in a superimposed manner with the video signal, and supplies it to the amplifier 22 via the recording/reproducing switch 26 . amplification! 12
2 amplifies the picked up signal and supplies it to a filter 23. The filter 23 separates a pilot signal and a video signal from the picked up signal and provides the pilot signal to the servo circuit 18. The servo circuit 18 adjusts the frequencies of the extracted pilot signal and the circulating pilot signal to be newly recorded, that is, for example, the frequency f1 of the pilot signal on the magnetic tape 7, the frequency f1 of the pilot signal to be newly recorded, and the frequency f1 of the pilot signal to be newly recorded. The rotation speeds of the capstan motor 19 and the reel motor 20 are controlled so that their phases match, thereby controlling the running of the magnetic tape 7.

Furthermore, the pulse 51 recorded on the cue track 50 on the magnetic tape 7 is picked up by the cue head 10 . This picked up pulse 51 is
Recording/playback switch 14. The signal is input to a microcomputer 17 via an amplifier 15 and a waveform shaping circuit 16.

The microcomputer 17 counts the number of regenerated second pulses. Therefore, the microcomputer 17 constitutes a second pulse counting means for counting the number of reproduced pulses. Then, the microcomputer 17 determines whether this second number of pulses matches the count value obtained by counting the first number of pulses reproduced when the magnetic tape 7 is transferred in the reverse direction during the above-mentioned pause. Decide whether or not. The state on the magnetic tape 7 at this time is shown in FIG. 2(d).

Thereafter, when the microcomputer 17 determines that the second number of pulses reproduced matches the first number of pulses when the magnetic tape 7 is transferred in the reverse direction, the microcomputer 17 When the number of pulses 51 recorded on the magnetic tape 50 becomes the same as the number of pulses counted during the reverse transport of the previous magnetic tape 7, the microcomputer 17 determines whether or not the polarity of the head switching signal 28 has been reversed. do. When it is determined that the polarity of the head switching signal 28 has been reversed, the recording/reproducing switch 26 is switched to the recording side in synchronization with this. The recording state on the magnetic tape 7 at this time is shown in FIG. 2(e). This second figure (
Reference numeral 52 shown in e) shows the state of the newly recorded video signal track. By this movement of -hen,
Resume the original recording operation.

Note that the constant amount when the magnetic tape 7 is transferred in the reverse direction is at least equal to the pilot signal recorded in a superimposed manner on the magnetic tape 7 when the magnetic tape 7 is transferred in the forward direction after the pause is released. The time required to match the frequency and phase of the pilot signal to be newly recorded is expressed by the markings of the magnetic tape 7.

Further, in the above-described embodiment, the case where previously recorded pulses remain in the cue track is described as an example, but the same operation can be performed using only newly recorded pulses.

Furthermore, in the above embodiment, the number of pulses recorded on the cue track 50 was 3 pulses with a frequency of 60 Hz.
At least one pulse of any frequency may be used, and the frequency and number of pulses may be freely selected according to the device.

Furthermore, in the above-described embodiment, if the number of pulses and the duty ratio of the pulses recorded on the cue track are adjusted, the recorded pulses can be used for cueing, etc.

[Effects of the Invention] As mentioned above, according to the present invention, when the magnetic tape is moved a certain amount in the forward direction during recording, one or more pulses are sent to the cue track provided separately from the video signal track. After recording, the magnetic tape is transported in the reverse direction for a certain distance rR, the number of cue track pulses picked up by the cue head at that time is counted, the pause is released, and the magnetic tape is transported in the forward direction. When recording, the pulses recorded in the cue track are counted again, and the recording operation is restarted when the counted value becomes the same as the number of pulses counted during reverse direction transfer. You can take ideal continuous shots without disturbing the seams.

In particular, with this invention, when taking pictures with a camera, it is possible to perform continuous shooting without disrupting the seams even when repeating recording -> pausing -> recording, which is frequently used in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing a recording state on a magnetic tape for explaining the operation of the embodiment shown in FIG. FIG. 3 is a flow diagram for explaining the operation of the embodiment shown in FIG. FIG. 4 is a diagram showing a recording state of a magnetic tape recorded by magnetic recording/reproducing @setting in a conventional control signal control system. FIG. 5 is a diagram showing the recording state of a magnetic tape recorded by the pilot signal control type magnetic recording/reproducing apparatus used in the present invention. In the figure, 7 is a magnetic tape, 10 is a cue head, 1
1 is a reference frequency signal generator, 12 is a gate circuit, 13.
15 is an amplifier, 14 is a recording/reproduction switch, 16 is a waveform shaping circuit, 17 is a micro combi coater, 18 is a servo circuit, 19 is a capstan motor, 20 is a reel motor,
26 is a recording/reproduction changeover switch, 27 is a pause signal, 28 is a head switching signal, 50 is a cue track, and 51 is a pulse recorded on the cue track. Agent Masuo Oiwa No. 3, Figure 4, Figure 5, TS'k) Ti-direction procedural amendment (self-motivated) Showa year, month, day, magnetic recording and reproducing device 3, person making the amendment 5, specification subject to amendment Detailed Description of the Invention Column 6, Contents of Amendment (1) "Magnetic tape in forward direction for a certain period of time" on page 8, line 18 of the specification is corrected to "magnetic tape in forward direction." (2) "Constant ω transfer in the forward direction" on page 9, line 18 of the specification is corrected to "transfer in the forward direction." (3) rcPLI 17 on page 17, line 13 of the specification
is corrected to "microcomputer 17". that's all

Claims (1)

[Scope of Claims] A magnetic recording and reproducing device for recording and reproducing a video signal consisting of image information on a magnetic tape using a video signal recording head, wherein in a pause mode, the video signal recording track on the magnetic tape is cue pulse generating means for generating at least one or more pulse signals to be recorded on a cue track provided separately from the cue track; a cue pulse generating means for recording and reproducing the pulse signal generated from the cue pulse generating means on the cue track; a cue head; forward transport signal generating means for generating a forward transport signal for transporting the magnetic tape in the forward direction in the recording mode and the pause release mode; a pulse signal being recorded on the cue track by the cue head; a backward transport signal generating means for generating a backward transport signal for transporting the magnetic tape in the reverse direction for a predetermined period of time in response to a forward transport signal from the forward transport signal generating means; tape running control means for transporting the magnetic tape in the forward direction and transporting the magnetic tape in the reverse direction for a predetermined time in response to a backward transport signal from the backward transport signal generating means; a first means for counting the number of pulse signals picked up by the cue head in response to the start of transporting the magnetic tape in the reverse direction based on a reverse transport signal from the reverse transport signal generating means; pulse counting means; recording control means for stopping recording of a video signal by the video signal recording head after the cue head records at least one pulse signal on the cue track; The traveling control means counts the number of pulse signals picked up by the cue head in response to the start of forward transport of the magnetic tape based on the forward transport signal from the forward transport signal generating means. A magnetic recording and reproducing device comprising: second pulse counting means; and means for restarting recording operation when the counted value of the second pulse counting means matches the counted value of the first pulse counting means.