JPH03706B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This disclosure relates to a video signal reproducing device for reproducing video signals from a long recording tape, and particularly relates 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 and reproducing device (hereinafter referred to as VTR).
This will be explained using an example of application.

[Conventional technology]

Generally, when playing repeatedly on a conventional VTR,
It was necessary to sequentially operate operation keys for stopping, reversing, stopping, and normal rotation reproduction, and repeating the above operations many times.

When you learn something from a recorded tape, or when you learn and correct your own bad habits by repeatedly watching the actions of a skilled athlete, you repeat the same scene over and over again until you are satisfied with it. It is often regenerated. This is true for all sports, including golf, baseball, bowling, tennis, skiing, and skating, and the quickest way to improve is to imitate the every move of an expert.

[Problem that the invention seeks to solve]

However, if you try to repeat the swing while looking at the screen, stopping, reversing,
Each time a key is operated for reverse playback, stop, or forward playback, the operation is interrupted, which not only prevents the user from concentrating on practice, but also causes the playback head to lose track of the recorded track each time.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a video signal reproducing apparatus that is capable of specifying a repeat playback section by a simple key operation and that is capable of performing effective repeat playback.

[Means for solving problems]

For this purpose, the video signal reproducing device of the present invention includes a driving means for moving a long recording tape in forward and reverse directions, and a reproducing device for reproducing the video signal recorded on the tape. a specifying key for specifying the predetermined section of the tape in order to repeatedly reproduce the predetermined section; and a control means for controlling the reproducing means and the driving means in order to repeatedly reproduce the predetermined section; The control means operates the driving means to alternately move the tape in both forward and reverse directions for a predetermined section designated by the designated key, and operates the reproducing means while the tape is moving in both forward and reverse directions. The structure was designed to encourage

[Effect]

According to the above-described configuration, it is possible to effectively utilize the period in which the tape is driven in the reverse direction, which naturally needs to be performed during repeated playback, to view the movement of the video in the reverse direction, and it is possible to perform extremely effective repeated playback. can.

〔Example〕

FIG. 1 is a control circuit diagram of a first embodiment of the present invention.

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

4 is a D-type flip-flop (hereinafter referred to as DFF) which converts the signal from the repeat playback operation key 21 into a D type flip-flop (hereinafter referred to as DFF).
It operates in synchronization with the clock from the clock generator 8. 5 is a DFF similar to 4.
Input the Q output of DFF4 to its D terminal. 6,
7 is an AND gate that forms a latch signal to store the contents of counter 3 in registers 9 and 10;
1 is a clock generator; 9 and 10 are registers; register 9 stores the data of counter 3 at the start position of repeat playback; and 10 stores data at the end position.

11 and 12 are a counter 3 and a register 9, respectively.
A comparator that compares the size of 10 data, 13,1
4, 22, 25 are OR gates, 15, 16 are flip-flops (hereinafter referred to as FF), 17, 18 are AND gates, 19 is a reversing device that drives the tape in reverse, 2
0 is a forward rotation device that drives forward rotation, 21 is a repeat playback operation key, 23 is a reset key for counter 3, 2
4 is a normal playback operation key, and 26 is a playback circuit including a playback head and a playback signal processing circuit.

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 and decreases in accordance with the forward and reverse rotation of the reel motor. At this time, if the repeat playback operation key (hereinafter referred to as repeat key) 21 is pressed,
A high level signal is input to the D terminal of DFF,
The Q output of the DFF 4 becomes high level in synchronization with the rising edge of the clock of the clock generator 8. Then
The D terminal of DFF5 also becomes high level, and after waiting for the next clock rise, the Q output of DFF5 becomes high level. Since the AND gate 7 receives the Q output of DFF4 and the output of DFF5, 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. Also, AND gate 6 is DFF
Since the output of DFF 4 and the Q output of DFF 5 are input, conversely, after the operation of releasing the repeat key 21 is performed, the level becomes high for one 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 data when the repeat key 21 is released to be latched in the register 9.

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 2.
6 into the operating state, that is, the device is in reverse playback mode.

Then, while looking at the TV monitor, the user continues to press the repeat key 21 until the position where he/she wants to start repeat playback is reached.
Let go of your hand.

Then, as mentioned above, the output of gate 6 becomes high level for one clock interval, and counter 3 at that time
The contents of are latched into register 9. At the same time, the FF 15 is reset via the OR gate 22 to stop the reverse rotation, and the tape is caused to rotate 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 normal rotation regeneration mode is entered.

According to the normal playback mode, counter 3 is the signal FG.
count up. And counter 3
When the data becomes the same as or larger than the data in the register 10 that stores the repeat end position data, the Q output of the comparator 12 becomes high level, and FF15 is set to automatically shift the device to reverse playback mode. .

In reverse playback mode, counter 3 outputs signal FG.
count down. When the data in the counter 3 becomes equal to or smaller than the data in the register 9 that stores the data of the repeat start position,
The Q output of comparator 11 becomes high level, and FF1
5 and automatically shifts to normal rotation playback mode. This operation is repeated thereafter.

The repeat playback operation is canceled by pressing the repeat key 21 again or 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, the tape is moved in both forward and reverse directions between the pressed and released positions of the repeat playback operation key 21 on the tape, and playback is performed while moving in both forward and reverse directions. Bidirectional repeat playback is performed.

Furthermore, since the tape starts rotating in reverse when the first repeat key is pressed, the ending position of the repeat section can be set first. In addition, it is possible to set a repeat section after confirming what kind of video is recorded in the section that the user wants to perform repeat playback by using reverse playback, so it is possible to specify a part that is disappointing. This eliminates the problem and makes key operations extremely simple.

FIG. 2 is a diagram showing a part of the control circuit, ie, a key input section, of a second embodiment of the present invention. Other parts are the same as in FIG. In the figure, 29 is a flip-flop. When the repeat key 21' is pressed, the FF 29 is set, the Q output becomes high level, the end position of the repeat section is set in the register 10 of FIG. 1 via the AND gate 7, and the tape is reversed. When the repeat key 21' is pressed a second time, the FF 29 is reset and the Q output becomes high level, the start position of the repeat section is set in the register 9 via the AND gate 6, and the tape rotates forward.

In this way, in the second embodiment, there is no need to keep pressing the repeat key while the tape is reversed from the end position to the start position of the repeat section.

FIG. 3 is a control circuit diagram of a third embodiment of the present invention. In the figure, parts having the same functions as in FIG. 1 are given the same numbers. In addition, the output of 27 rises when the repeat key 21' is operated.
This is a timer circuit that holds a high level signal for a period determined by a variable resistor 28. In the first embodiment, the end position of the repeat section is set using the repeat key 2.
Determine the starting position by pressing 1 and press repeat key 2.
1, but in this embodiment, only the end position of the repeat section is determined by the repeat key 2.
1'' operation, and the start position is automatically determined by the output of the timer circuit 27.Therefore, two key operations are not required.Furthermore, by varying the value of the variable resistor 28, the length of the repeat section can be adjusted. It becomes possible to change.

In this embodiment, the 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.

〔Effect of the invention〕

According to the playback device of the present invention, it is possible to repeatedly view the motion of the video in both forward and reverse directions, and it is possible to obtain an effective video. Also, when the user suddenly wants to immediately see the part that was just monitored again,
Since there is no need to perform complicated key operations, the system is extremely user-friendly for the user.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of the VTR of the first embodiment,
FIG. 2 is a diagram showing a part of the control circuit of the second embodiment, and FIG. 3 is a diagram of the control circuit of the third embodiment. In the figure, 1 is a display, 2 is a decoder, 3 is a tape counter, 4, 5 are D-type flip-flops, 6, 7, 17, 18 are AND gates, 9, 1
0 is a register, 11, 12 are comparators, 13, 1
4, 22, 25 are or gate, 15, 16, 29
are flip-flops, 19 and 20 are reverse and forward rotation drive devices, 21, 21' and 21'' are repeat playback operation keys, 26 is a playback circuit, 27 is a timer circuit,
28 indicates variable resistors.

Claims (1)

[Claims] 1. A driving means for moving a long recording tape in the forward and reverse directions, a reproducing means for reproducing the video signal recorded on the tape, and a reproducing means for reproducing the predetermined section of the tape in order to repeatedly reproduce the predetermined section. and a control means for controlling the reproducing means and the driving means to repeatedly reproduce the predetermined section, the control means controlling the tape for the predetermined section specified by the specifying key. A video signal reproducing apparatus characterized in that the driving means is operated to move the tape alternately in both forward and reverse directions, and the reproducing means is operated while the tape is being moved in both forward and reverse directions.