JP2861536B2 - Digital recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording / reproducing apparatus effective for use in a video tape recorder.

[0002]

2. Description of the Related Art In a helical scan type digital recording / reproducing apparatus for recording / reproducing digital data obtained by digitizing a video signal and an audio signal on a recording track inclined in a longitudinal direction on a magnetic tape by a rotary head, a huge amount of information is obtained. In order to record the data, one field or one frame of data is not recorded on one track, but one field or one frame of data is recorded on a plurality of tracks and reproduced. For this reason, the control of the capstan, in which the data on the magnetic tape is transmitted one field or one frame at a time during special playback such as frame advance or slow motion, is performed by a JOG dial or the like that can freely control the speed of the capstan. The magnetic tape is sent little by little by a slow continuous throw, and during this time, multiple tracks on the magnetic tape are scanned with the magnetic head many times, and the data of the multiple tracks obtained from the magnetic head is stored in the memory of the signal processing circuit each time. The picture was output when the data for one field or one frame was stored in the memory.

FIG. 5 is a diagram showing a configuration of a conventional digital recording / reproducing apparatus. In FIG. 5, 1 is a signal processing circuit, 2 is a memory for storing data, 3 is a system controller, 4 is a servo circuit for controlling a motor, 5 is a cylinder, 6 is a rotary head, 7 is a capstan, 8 is a magnetic tape, Reference numeral 9 denotes a bus for communication between the blocks, reference numeral 10 denotes a switch for selecting various modes, reference numeral 11 denotes a JOG dial capable of freely controlling the speed of the capstan, and reference numeral 12 denotes a JOG dial operation permission button.

FIG. 6 is a diagram showing a state in which a rotary head scans over a magnetic tape during slow reproduction.
Here, the description is made on the assumption that the number of tracks in one frame is five. In FIG. 6, reference numeral 21 denotes the trajectory of the head for normal reproduction, and reference numeral 22 denotes the trajectory of the head at the time of slow motion.

FIG. 7 is a diagram showing the movement of the capstan and the flow of data from the magnetic tape to the memory. In FIG. 7, (a) shows a change in the speed of the capstan,
(B) is the amount of data in the memory, 33 is the amount of data for one frame or one field, 34 is one frame,
Alternatively, it is a timing at which data for one field is accumulated.

In the figure, from the normal reproduction state, the user performs an operation to enter a mode in which the JOG dial 11 can be operated by using the JOG dial operation permission button 12 of the various mode changeover switch 10. The system controller 3 operates the changeover switch 10 with the JOG dial operation permission button 1
2, the capstan 7 is transmitted to the servo circuit 4 for controlling the motor using the communication bus 9 between the blocks so that the capstan 7 is set to the JOG dial operation mode.
When the capstan 7 enters the JOG dial operation mode, the system controller 3 puts the JOG dial 11 into a mode in which it can be actually operated. The user operates the JOG dial 11 after confirming that the mode has become a mode in which the JOG dial 11 can be actually operated. Upon receiving a signal from the JOG dial 11, the system controller 3
Is the servo circuit 4 using the communication bus 9 between each block.
To the capstan 7 to rotate at a lower speed than usual. While the capstan 7 is rotating at a low speed, the rotating head 6 continues to pick up data on the magnetic tape 8.

However, since the capstan 7 is rotating at a lower speed than the normal reproduction, the rotating head 6 and the magnetic tape 8 are rotated.
Is no longer normal, and the scanning of the rotary head 6 extends over a plurality of tracks on the magnetic tape 8, and a state in which data can be partially picked up for each track continues. The data on the magnetic tape 8 picked up by the rotating head 6 is sent to the signal processing circuit 1, and the data is transferred therefrom to the memory 2 for storing the data. Then, data is stored in the memory 2 little by little, and when one frame of data is stored in the memory 2, it is output as one screen for the first time. Until then, the user operates the JOG dial 11 little by little while watching the output screen until the output screen is switched. When the user confirms that the output screen has been switched, the frame advance of one frame is completed, and the user stops the operation of the JOG dial 11 or, if necessary to advance another frame, again performs the JOG dial again. Operate.

[0008]

However, the conventional configuration described above has the following problems.

In the prior art, the frame feed operation is performed in such a manner that a control circuit such as a servo or a system controller operates independently of the signal processing circuit. Is the only way to make a judgment by looking at the output screen, that is, it can only be realized by operating the JOG dial or the like.
A simple operation for the user, such as sending a field or one frame, has not been realized.

The present invention has been made in view of the problems of the prior art, and
In a digital recording / reproducing apparatus which performs recording / reproducing by dividing a field or one frame into a plurality of tracks, a simple operation for a user can be performed in which the user can advance one field or one frame by pressing the frame forwarding button once. It is an object of the present invention to provide a digital recording / reproducing device characterized by realization.

[0011]

The present invention SUMMARY OF] is Te digital recording and reproducing apparatus smell is performing one field, or the recording is divided into a plurality of tracks of one frame, a magnetic
When the row Nau playback is run at a lower speed than normal playback tape, and controls the capstan motor that stored data on the tape one field in the memory of the signal processing circuit, or by one frame A digital recording / reproducing apparatus having a bus for transmitting to a servo circuit and controlling the operation of the capstan by sending a signal from the signal processing circuit to the servo circuit via the bus.

[0012]

According to the present invention, one field,
Alternatively, in a digital recording / reproducing apparatus in which one frame is divided into a plurality of tracks for recording / reproducing, a simple operation for a user can be performed in which a single press of the frame advance button enables one field or one frame advance.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that, in the configuration diagram of the embodiment, the description of the blocks with the same numbers as those of the conventional example is omitted.

FIG. 1 is a diagram showing a configuration of a digital recording / reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a bus for notifying that data for one frame has been stored in a memory 2 for storing data from a signal processing circuit 1 to a servo circuit 4 for controlling a motor, and 102 is a frame feed button.

FIG. 2 is a diagram showing the movement of the capstan 7 and the flow of data from the magnetic tape 8 to the memory 2 in the digital recording / reproducing apparatus according to the first embodiment of the present invention. In FIG. 2, (c) is a signal on the bus 101 for transmitting that one frame of data is stored in the memory from the signal processing circuit 1 to the servo circuit 4 for controlling the motor.

In the figure, from the normal reproduction state, the user operates the various mode changeover switches 10 to perform an operation to enter the operation mode of the pause. The system controller 3 accepts the operation of the changeover switch 10 and causes the signal processing circuit 1 and the servo circuit 4 for controlling the motor to use the communication bus 9 between the blocks so that the capstan 7 is set to the operation mode in which the capstan 7 is temporarily stopped. Tell When the operation of the capstan 7 is temporarily stopped, the system controller 3 enters an operation mode in which frame advance can be performed. When confirming that the operation mode is the operation mode in which frame advance can be performed, the user presses the frame advance button 102 of the various mode changeover switch 10. Upon receiving a signal from the changeover switch 10, the system controller 3 sends the capstan 7 to the servo circuit 4 using the communication bus 9 between the blocks.
Is transmitted at a low speed, and the signal processing circuit 1 is instructed to carry out frame feed. While the capstan 7 is rotating at a low speed, the rotating head 6 continues to pick up data on the magnetic tape 8. However, since the capstan 7 is rotating at a lower speed than the normal reproduction, the trajectory of the rotating head 6 and the magnetic tape 8 is not normal, and the scanning of the rotating head 6 extends over a plurality of tracks on the magnetic tape 8. Also, the state that data can be picked up little by little for each track continues.

The data on the magnetic tape 8 picked up by the rotary head 6 is sent to the signal processing circuit 1, from which the data is transferred to the memory 2 for storing the data. Then, data is stored in the memory 2 little by little, and when one frame of data is stored in the memory 2, it is output as one screen for the first time.
At the same time, one frame of data was stored in the memory 2 for the servo circuit 4 by the bus 101 which transmitted that one frame of data was stored in the memory 2 from the signal processing circuit 1 to the servo circuit 4 for controlling the motor. Send a signal that tells you. The servo circuit 4 stops the capstan 7 by the signal on the bus 101. Further, the signal processing circuit 1 continues to store the data on the magnetic tape 8 picked up by the rotary head 6 in the memory 2 until the capstan 7 stops even after the signal is sent on the bus 101. This is because a time lag necessarily occurs between the time when the capstan 7 is stopped after the signal is transmitted on the bus 101 and the magnetic tape advances to the next frame. This is to prevent data loss during the next frame advance.

The above operation is performed by the frame advance button 102
However, the present invention can be similarly realized by the JOG dial 11. In that case, it is prescribed that one frame is sent by turning the JOG dial 11 at a certain angle,
The system controller 3 determines how many frames should be advanced from the rotation angle of the JOG dial 11 and uses the communication bus 9 between the blocks to inform the servo circuit 4 how many frames to send. It is only necessary to determine how many times the signal on the bus 101 from the signal processing circuit 1 indicating that one frame of data has been stored in the memory 2 should stop the capstan 7.

FIG. 3 is a diagram showing the configuration of a digital recording / reproducing apparatus according to a second embodiment of the present invention. In FIG. 3, reference numeral 201 denotes a bus for transmitting that one field of data has been stored in the memory 2 for storing data from the signal processing circuit 1 to the servo circuit 4 for controlling the motor.

FIG. 4 is a diagram showing the movement of the capstan 7 and the flow of data from the magnetic tape 8 to the memory 2 in the digital recording / reproducing apparatus according to the second embodiment of the present invention. In FIG. 4, reference numeral 211 denotes a signal on the bus 201 that notifies the servo circuit 4 that controls the motor from the signal processing circuit 1 that data for one frame has been stored in the memory.

In the figure, from the normal reproduction state, the user operates the various mode changeover switches 10 to perform an operation to enter the operation mode of the pause. The system controller 3 accepts the operation of the changeover switch 10 and causes the signal processing circuit 1 and the servo circuit 4 for controlling the motor to use the communication bus 9 between the blocks so that the capstan 7 is set to the operation mode in which the capstan 7 is temporarily stopped. Tell When the operation of the capstan 7 is temporarily stopped, the system controller 3 enters an operation mode in which frame advance can be performed. When confirming that the operation mode is the operation mode in which frame advance can be performed, the user presses the frame advance button 102 of the various mode changeover switch 10. Upon receiving a signal from the changeover switch 10, the system controller 3 sends the capstan 7 to the servo circuit 4 using the communication bus 9 between the blocks.
Is transmitted at a low speed, and the signal processing circuit 1 is instructed to carry out frame feed. While the capstan 7 is rotating at a low speed, the rotating head 6 continues to pick up data on the magnetic tape 8. However, since the capstan 7 is rotating at a lower speed than the normal reproduction, the trajectory of the rotating head 6 and the magnetic tape 8 is not normal, and the scanning of the rotating head 6 extends over a plurality of tracks on the magnetic tape 8. Also, the state that data can be picked up little by little for each track continues. The data on the magnetic tape 8 picked up by the rotating head 6 is sent to the signal processing circuit 1, and the data is transferred therefrom to the memory 2 for storing the data. Then, the data is stored little by little in the memory 2 and 1 is stored in the memory 2.
It is output as one screen for the first time when data for the field is stored. At the same time, one field of data was stored in the memory 2 for the servo circuit 4 by the bus 201 which transmitted that one field of data was stored in the memory 2 from the signal processing circuit 1 to the servo circuit 4 for controlling the motor. Send a signal that tells you. The servo circuit 4 stops the capstan 7 according to the signal on the bus 201. The signal processing circuit 1 continues to store the data on the magnetic tape 8 picked up by the rotary head 6 in the memory 2 until the capstan 7 stops even after the signal is sent on the bus 201. This is because a time lag necessarily occurs between the time when the capstan 7 is stopped after the signal is sent on the bus 201 and the magnetic tape advances to the next field. This is to prevent data loss during the next frame advance.

The above operation is performed by the frame advance button 102
However, the present invention can be similarly realized by the JOG dial 11. In this case, it is specified that the field is to be advanced by rotating the JOG dial 11 by a certain angle, and the system controller 3 determines how many fields should be advanced from the rotation angle of the JOG dial 11 and determines between each block. The servo circuit 4 uses the communication bus 9 to inform the servo circuit 4 how many fields to send, and the servo circuit 4 sends a signal from the signal processing circuit 1 to the memory 201 to inform the memory 2 that data for one field has been stored. It should be determined how many times the capstan 7 should be stopped.

[0023]

As described above, according to the present invention, 1
In a digital recording / reproducing apparatus which performs recording / reproducing by dividing a field or one frame into a plurality of tracks, one field or one field is stored in a memory of a signal processing circuit.
By providing a dedicated bus for notifying the servo circuit for controlling the capstan that the data for the frame has been stored, it is possible to control the frame feed, and the practical effect is large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing the movement of the capstan and the flow of data from the magnetic tape to the memory in the digital recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a digital recording / reproducing apparatus according to a second embodiment of the present invention;

FIG. 4 is a timing chart showing the movement of a capstan and the flow of data from a magnetic tape to a memory in a digital recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional digital recording / reproducing apparatus.

FIG. 6 is a diagram showing a state in which a rotary head scans on a magnetic tape during slow reproduction in a conventional example.

FIG. 7 is a timing chart showing the movement of a capstan and the flow of data from a magnetic tape to a memory in a conventional digital recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal processing circuit 2 Memory 3 System controller 4 Servo circuit 5 Cylinder 6 Rotating head 7 Capstan 8 Magnetic tape 9 Bus 10 Changeover switch 11 JOG dial 12 JOG dial operation permission button 101 Bus 102 Frame feed button 201 Bus

Claims (2)

(57) [Claims] 1. A helical scan type digital recording / reproducing apparatus for recording / reproducing digital data obtained by digitizing a video signal and an audio signal on a recording track inclined in a longitudinal direction on a magnetic tape by a rotary head. , M fields of data are divided into n tracks and recorded, and the magnetic tape is run at a lower speed than normal playback.
When performing playback, capture by having a bus saying that the stored one or more frame data on the tape in a memory of the signal processing circuit in a servo circuit for controlling the capstan motor, sends a signal in the bus A digital recording / reproducing apparatus for controlling the operation of a stun. 2. An m-field data is recorded by being divided into n tracks, and a magnetic tape is run at a lower speed than normal reproduction.
When performing playback by, has a bus to convey that accumulated over one field data on the tape in a memory of the signal processing circuit in a servo circuit for controlling the capstan motor, to send a signal in the bus 2. The digital recording / reproducing apparatus according to claim 1, wherein the operation of the capstan is controlled by the control.