JPH0263263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a video signal reproducing device for reproducing video signals from a long recording tape, and more particularly to a reproducing device having a function of repeatedly reproducing the same section of a recording tape.

Hereinafter, the present invention will be described as a magnetic recording image reproducing device (hereinafter referred to as
This will be explained using an example of application to VTR).

<Description of the Prior Art> Generally, when repeatedly playing back on a conventional VTR, it was necessary to sequentially operate operation keys for stopping, reversing, stopping, and forward playback, and repeating the above operations many times.

Learn something with recorded tapes,
Or, by repeatedly watching the movements of skilled sportsmen, people learn about their own bad habits and try to correct them, often by replaying the same scene over and over again until they are satisfied. This applies to all sports, such as golf, baseball, bowling, tennis, skiing, and skating, and it is said that the quickest way to improve is to imitate the every move of an expert.

However, when you try to swing repeatedly while looking at the screen, each time you press the stop, reverse, stop, or forward play keys, the movement is interrupted, which not only makes it difficult to concentrate on practice, but also makes it difficult to concentrate on practicing. The tracking of the playback head relative to the recording track becomes deviated.

<Object of the Invention> In view of the drawbacks of the prior art as described above, the present invention provides a video signal in which an arbitrary section or a frequently used section can be easily specified and the specified section can be repeatedly played back. The purpose is to provide playback equipment.

<Explanation of Examples> The figure is a control circuit diagram of one embodiment of the present invention.

In the figure, 1 is a display that displays the contents of a tape counter 3, 2 is a decoder that converts the tape counter data into display data, and 3 is a tape counter that signals the rotational frequency of a reel motor (not shown).
FG is input to the clock terminal C, and a signal indicating the forward/reverse rotation of the reel motor is input to the UP/down terminal. When the reel motor is rotating in the normal direction, the count is up, and when the reel motor is rotating in the reverse direction, the count is down.

4 is a D-type flip-flop (hereinafter referred to as DFF) which inputs the signal from the OR gate 28 to its D terminal and operates in synchronization with the clock from the clock generator 8. 5 is the same DFF as 4, and inputs the Q output of DFF4 to its D terminal. 6 and 7 are AND gates that form latch signals to store the contents of counter 3 in registers 9 and 10, 8 is a clock generator, 9 and 10 are registers, and register 9 stores the data of counter 3 at the start position of repeat playback. remember,
10 stores end position data. 11,12
are comparators 13, 14, 22, and 2 that compare the magnitude of data in counter 3 and registers 9 and 10, respectively.
5 and 28 are OR gates, 15 and 16 are flip-flops (FF), 17 and 18 are AND gates,
19 is a reversing device that drives the tape in reverse, 20 is a normal rotation device that drives the tape forward, 21 is a repeat playback operation key, 23 is a reset key for the counter 3, 24 is a normal playback operation key, and 26 is a playback head and playback signal processing. The reproducing circuit 27 includes a timer circuit that maintains the high level output of the repeat reproducing operation key 21 for a predetermined period of time.

Explain the operation. When the device is in the playback mode, the data on the counter 3 receives the frequency signal FG from the reel motor, and increases or decreases in accordance with the forward or reverse rotation of the reel motor. At this time, when the repeat playback operation key (hereinafter referred to as the repeat key) 21 is pressed, a high level signal is input to the D terminal of the DFF4 via the OR gate 28, and the Q output of the DFF4 is synchronized with the rising edge of the clock of the clock generator 8. It becomes a high level. Then, the D terminal of DFF5 also becomes high level, and DFF waits for the next clock rise.
The Q output of No. 5 becomes high level. Since the Q output of DFF4 and the output of DFF5 are input to AND gate 7, it becomes high level at the first rising edge of the clock after pressing the repeat key, and becomes low level at the rising edge of the next clock. Furthermore, since the output of DFF4 and the Q output of DFF5 are input to the AND gate 6, the level becomes high for one clock interval after the operation of releasing the repeat key 21 is performed. In addition, if the repeat key 21 is released within the time measured by the timer 27, the output level of the timer 27 falls and then
It becomes high level for the clock interval. The high level output of the AND gate 7 causes the data of the counter 3 when the repeat key 21 is pressed to be latched in the register 10, and the output of the gate 6 causes the repeat key 21 to be pressed.
The data is latched in the register 9 at the time of the separation operation or when the output of the timer 27 falls.

The Q output of the FF 16 is normally at a low level because the signal PO, which becomes high level only when a power switch (not shown) is turned on, is input to the R terminal of the FF 16 via an OR gate. Furthermore, even in the playback mode, the output of the playback operation key 24 is at a high level, so the Q output of the FF 16 is at a low level.

If repeat key 21 is pressed here, FF16
Q output of becomes high level and gate 17,
Open 18. On the other hand, since the FF 15 is set via the OR gate 13 by the latch signal from the gate 7, the output of the AND gate 17 is transferred via the reverse drive device 19 and the OR gate 25 to the reproduction circuit 26.
put it in working condition. That is, the device enters the reverse playback mode.

In the first mode, the user continues to press the repeat key 21 while watching the TV monitor until the desired position for starting repeat reproduction is reached, and releases the repeat key 21 when the user reaches the starting position. Also, the second
In this mode, when the user presses the repeat key 21 and immediately releases it, the tape is reversed for a period of time determined by the time constant of the timer circuit 27.

Then, as described above, the output of the gate 6 becomes high level for one clock interval, and the contents of the counter 3 at that time are latched in the register 9. At the same time, the FF 15 is reset via the OR gate 22 to stop the reverse rotation. Then, the tape is rotated in the normal direction by the normal rotation driving device 20 via the AND gate 18. At this time, since the regeneration circuit 26 also maintains the regeneration state, the mode shifts to the normal rotation regeneration mode.

According to the normal playback mode, counter 3 is the signal FG.
count up. And counter 3
When the data becomes equal to or larger than the data in the register 12 that stores the data at the end of repeat position, the Q output of the register 12 becomes high level, FF15 is set, and the apparatus is automatically shifted to the reverse reproduction mode.

In reverse playback mode, counter 3 outputs signal FG.
count down. When the data of the counter 3 becomes equal to or smaller than the data of the register 11 storing the data of the repeat start position, the Q output of the comparator 11 becomes high level.
Reset FF15 and automatically shift to forward playback mode. This operation is repeated thereafter.

In this way, the repeat playback operation key 21 is played between the pressed position and the released position on the tape (first mode), or the position determined by the pressed position of the repeat playback operation key 21 and the time constant of the timer circuit 27. The playback between (second mode) is repeated. The repeat playback operation is canceled by pressing the playback key 24. That is, the Q output of the FF 16 becomes low level and the gates 17 and 18 are closed. In addition to this, it is also possible to design it so that it can be canceled by other operation keys such as a stop key, fast forward key, rewind key, etc.

In this way, in this embodiment, it is possible to select between the first mode in which the length of the repeat section is arbitrarily determined and the second mode in which the length is set at a predetermined time by operating a single key. It is extremely convenient for the user. As shown in the figure, by allowing the user to arbitrarily adjust the value of the variable resistor 29, it becomes possible for each user to set the length of the frequently used repeat section.

In addition, in the device of this embodiment, the tape starts to rotate in reverse when the first repeat key is pressed, so the end position of the repeat section can be set at the beginning. Since the settings can be made, there is no need to specify an unexpected location, and key operations are extremely simple.

In this embodiment, counting is performed using signals related to the rotation of the reel motor, but signals related to the rotation of the capstan motor may also be counted.

Further, although the configuration is such that reproduction is performed during the reverse rotation during repeat, the configuration may be such that the reproduction operation is not performed except when the repeat start position is specified.

<Description of Effects> The playback device of the present invention can easily specify an arbitrary section or a frequently used section, and can repeatedly play the specified section. It is extremely easy to use.

[Brief explanation of the drawing]

The figure is a control circuit diagram of the VTR of this embodiment. In the figure, 1 is a display, 2 is a decoder, 3 is a tape counter, 4 and 5 are D-type flip-flops,
6, 7, 17, 18 are and gates, 10, 11
are registers, 11, 12 are comparators, 13, 14,
22 and 25 are OR gates, 15 and 16 are flip-flops, 19 and 20 are reverse and forward rotation drive devices, respectively, 21 is a repeat playback operation key, and 26 is a playback circuit, respectively.

Claims (1)

[Claims] 1. A driving means for transporting a long recording tape in forward and reverse directions, a reproducing means for reproducing the video signal recorded on the tape, and a designation key for specifying a repeat section of the tape to be repeatedly reproduced. a control means for controlling the playback means to repeatedly play the repeat section, and the specifying means includes a control means for controlling the playback means in order to repeatedly play back the repeat section, and the specifying means includes a control means for controlling the playback section when the tape section specified by the previous specification key is shorter than the tape section corresponding to a predetermined time. A video signal reproducing device characterized in that a tape section corresponding to a predetermined time is set as a repeat section.