JPH0636411A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a video signal recording and reproducing device capable of reproducing without noise in a variable speed reproducing mode and shortening a lock time to a standard recording.reproducing mode and a shift time to a standstill mode. CONSTITUTION:Command speed of the variable speed reproducing mode from a system controller 24 is supplied to a reference signal generator 11, and mode command selecting second acceleration/deceleration data 13 which is slower than the first acceleration/deceleration data 12 in recording, reproducing and standstill modes and can be reproduced without noise and connecting to the reference speed generator 11 is supplied to a selector 14. A speed feed-back loop block 20 is operated based on the reference speed calculated by the reference speed generator 11 aid capstan speed is attained to the speed of command. At the time of a variable speed reproducing mode, comparatively so gentle acceleration/deceleration that the reproducing can be executed without noise is executed, at the time of recording, reproducing, standstill modes, acceleration/ deceleration of the maximum ability of a capstan motor 25 is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording tape running control method and a signal recording / reproducing apparatus suitable for application to a video tape recorder or the like.

[0002]

2. Description of the Related Art Operation modes of a video tape recorder (hereinafter referred to as VTR) are "STOP (stop) mode" in which a capstan motor does not drive a tape, and "FF".
(Fast forward) mode "and" REW (rewind) mode "
Then, the pinch roller presses the tape against the capstan shaft and the capstan motor drives the tape, ie, "REC (record) mode", "PLAY (playback) mode" and "variable speed play mode" (including still mode. , VAR mode).

Among these modes, REC and PLAY
The mode is required to accelerate to a predetermined speed as soon as possible. In the REC mode, it is better to start the correct recording portion earlier, and in the PLAY mode, the shorter the time until the servo lock is, the shorter the editing time becomes.

Similarly, when the capstan is running
When shifting to the mode, it is required to reduce the speed to 0 (zero) as soon as possible. For example, PLAY to REW
At this time, the mode control of PLAY → STOP → REW is performed. At this time, it is desired that the tape be stopped as soon as possible during the transition from PLAY → STOP. The shorter the time until this stop, the shorter the editing time.

On the other hand, the VAR mode is also required to reach the target speed quickly, but in recent years, noiseless reproduction for displaying a noiseless screen has been demanded. Tracking is performed by moving the rotary head up and down using the tape speed and the RF envelope level as parameters. However, if the speed change is too fast, the tracking cannot be followed, and the acceleration / deceleration is limited. Therefore, conventionally, an acceleration / deceleration characteristic that enables noiseless reproduction is set, and the acceleration / deceleration is performed according to the setting. The acceleration / deceleration characteristics are constant in all capstan runs, and the acceleration / deceleration is performed accordingly in the PLAY and STOP modes.

Therefore, even if the acceleration and deceleration can still be increased as the performance of the capstan motor and its drive amplifier, the acceleration and deceleration performance is lowered in order to perform noiseless reproduction in the VAR mode. Was supposed to sacrifice time.

[0007]

In view of the above problems, the present invention enables noiseless reproduction in the VAR mode, shortens the lock (LOCK) time in the PLAY and REC modes, and shortens the transition time to the STOP as compared with the conventional art. The point is to provide a tape recording / reproducing apparatus that enables the above.

[0008]

SUMMARY OF THE INVENTION The present invention is a tape running speed control method for a signal recording / reproducing apparatus for recording a video signal on a slanted track of a recording tape. In a variable speed reproducing mode, the tape running speed is decelerated. Is a tape running speed control method characterized by controlling so as to change more slowly than a standard recording / reproducing mode, wherein a plurality of acceleration / deceleration data, a system controller, and a command output from the system controller are provided. A selector that selects one of the plurality of acceleration / deceleration data according to a signal, and a reference speed is calculated based on the acceleration or deceleration selected by the selector with the command speed output from the system controller as a target. A reference speed generator for outputting, a tape speed detector for detecting and outputting the tape running speed, and a reference for outputting by the reference speed generator. It said tape running speed tape speed detector output is characterized in that it comprises a drive unit for driving the motor to match the time. Further, among the plurality of acceleration / deceleration data, one acceleration / deceleration data is variable speed reproduction mode data, and the other acceleration / deceleration data is recording mode data, reproduction mode data, and stop mode data.

[0009]

1 is a block diagram of an embodiment of a tape recording / reproducing apparatus of the present invention. In FIG. 1, reference numeral 10 is a control block of a capstan motor, and the capstan control block 10 includes a reference speed generator 11 and a PLAY.R.
First acceleration / deceleration data 12, V for EC / STOP mode
It is composed of the second acceleration / deceleration data 13 for the AR mode, the acceleration / deceleration data selector 14, and the motor speed feedback loop 20. The motor speed feedback loop 2
0 is composed of a capstan speed detector 21, a subtractor 22, and a motor drive amplifier 23. A system controller 24 issues an operation mode command.

The operation of the recording / reproducing apparatus configured by this block diagram will be described below. An FG (frequency generator) signal 31 is output from the capstan motor 25, and the present capstan speed 28 is obtained from the FG signal 31 by the capstan speed detector 21. Capstan motor 2
Capstan speed 28 when driving tape at 5
Is the tape speed. On the other hand, the reference speed generator 11 outputs a reference speed of 30. The subtracter 22 reference speed 30 and the capstan speed 28 are subtracted, and the speed error signal 29 is supplied to the motor drive amplifier 23 to drive the capstan motor 25.

When the capstan speed 28 is faster than the reference speed 30, a speed error signal that causes the capstan motor 25 to rotate slower. On the contrary, when the capstan speed 28 is slower than the reference speed 30, the capstan speed is lower than the reference speed 30. Motor 2
Feedback is applied so that a speed error signal for rotating the motor 5 quickly is supplied to the motor drive amplifier 23. In this way, the rotation speed of the capstan motor 25 changes according to the reference speed 30. The control of the rotation speed of the normal capstan motor has been described above. Next, the device of the present invention will be described.

[In REC Mode] The capstan speed in REC mode is supplied from the system controller 24 to the reference speed generator 11 as the command speed 27, and the first speed
A mode command 26 for selecting the acceleration / deceleration data 12 is supplied to the selector 14. The selector 14 connects the first acceleration / deceleration data 12 to the reference speed generator 11. The reference speed generator 11 calculates [next reference speed] = [current reference speed] + [first acceleration / deceleration data] every time and outputs the reference speed 30. Finally, the reference speed 30 becomes the REC speed.

Since the speed feedback loop block 20 works so that the actual capstan speed also becomes the reference speed 30, the speed is accelerated and decelerated in accordance with the reference speed 30 to reach the REC speed. Since the first acceleration / deceleration data 12 contains the acceleration / deceleration data of the maximum capacity of the capstan motor 25, the speed of accurate REC is reached quickly. In addition, PLAY, STO
Also in the P mode, control is similarly performed based on the acceleration / deceleration data of the maximum capacity of the capstan motor 25.

[In VAR Mode] The capstan speed in VAR mode is supplied from the system controller 24 to the reference speed generator 11 as a command speed 27, and the second speed is used.
A mode command 26 for selecting the acceleration / deceleration data 13 is supplied to the selector 14. Then, the selector 14 connects the second acceleration / deceleration data 13 to the reference speed generator 11. The reference speed generator 11 calculates [next reference speed] = [current reference speed] + [second acceleration / deceleration data] every unit time and outputs the reference speed 30. Below, as in the REC mode, the velocity feedback loop block 2
0 operates and the capstan speed becomes the commanded speed.
Since the second acceleration / deceleration data 13 contains acceleration / deceleration data that is later than the first acceleration / deceleration data 12 and enables noiseless reproduction, noiseless traveling is performed during VAR traveling.

As described above, in the VAR mode, a relatively gentle acceleration / deceleration to the extent that noiseless reproduction can be performed, and in the REC, PLAY, and STOP modes, acceleration / deceleration with the maximum capacity of the capstan motor can be performed.
Although two acceleration / deceleration data are selected in the above-mentioned embodiment, it is possible to set and select any number of acceleration / deceleration data depending on the mode. The acceleration and deceleration of the first and second acceleration / deceleration data may be the same or different,
It can be selected as needed.

FIG. 2 shows a deceleration characteristic and a PLAY / REC mode when decelerating from a triple speed in the above embodiment.
The acceleration characteristics in the VAR mode are shown. In the STOP mode, deceleration is 2.5 times faster than usual, and V
In the AR mode, the acceleration is about half that in the PLAY / REC mode, that is, the acceleration is gentle.

[0017]

INDUSTRIAL APPLICABILITY The present invention enables noiseless reproduction in the VAR mode, shortens the lock (LOCK) time to the PLAY and REC modes, and shortens the transition time to the STOP mode as compared with the conventional art, and enables operations such as tape editing. The property is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing an example of acceleration / deceleration characteristics of the present invention.

[Explanation of symbols]

11 Reference Speed Generator 12 First Acceleration / Deceleration Data 13 Second Acceleration / Deceleration Data 14 Data Selector 20 Capstan Motor Speed Feedback Loop Block 24 System Controller 25 Capstan Motor

Claims (4)

[Claims] 1. A tape traveling speed control method for a signal recording / reproducing apparatus for recording a video signal on an inclined track of a recording tape, wherein tape acceleration / deceleration is selected and controlled according to an operation mode. Control method. 2. A tape traveling speed control method for a signal recording / reproducing apparatus for recording a video signal on an inclined track of a recording tape, wherein in a variable speed reproduction mode, the acceleration / deceleration of the tape traveling speed is set higher than that of a standard recording / reproducing mode. The tape running speed control method according to claim 1, wherein the tape running speed control method is also controlled so as to change gently. 3. A plurality of acceleration / deceleration data, a system controller, a selector for selecting one of the plurality of acceleration / deceleration data according to a command signal output from the system controller, and an output from the system controller. A reference speed generator that calculates and outputs a reference speed based on the acceleration or deceleration selected by the selector with the command speed as a target, a tape speed detector that detects and outputs the tape running speed, and the reference speed generator. And a drive device that drives a motor so that the tape traveling speed output from the tape speed detector matches the reference speed output from the device. 4. One of the plurality of acceleration / deceleration data is variable speed reproduction mode data, and the other acceleration / deceleration data is recording mode data, reproduction mode data, and stop mode data. The signal recording / reproducing apparatus according to claim 3.