JPH0233303Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a playback device for playing back a videotape on which a video signal and a control signal for regulating the relationship between the video signal and a playback head are recorded. By simply performing an operation, unnecessary portions are automatically fast-forwarded or fast-forwarded (hereinafter referred to as CUE), thereby reducing the time required for better playback.

Conventionally, in a playback device that plays back a videotape on which a video signal or the like is recorded, when an attempt is made to playback a videotape T on which a program A and programs _B1 , _B2, etc. are recorded, as shown in FIG. However, the drawback was that the image was disrupted by commercials etc. during the program, causing discomfort and irritation. In such cases, the viewer presses the CUE button or the fast-forward button each time the unnecessary portion of a commercial, etc. is viewed to shorten the time required to play the unnecessary portion. Therefore, when the same program, etc. on videotape T is to be viewed many times, it is necessary to press the CUE button or the fast forward button each time an unnecessary portion is viewed, which is time consuming and bothersome.

In view of this, the present invention is designed to automatically cue or fast-forward unnecessary parts of commercials, etc., and to shorten the playback time by just making a simple touch-up once. .

Hereinafter, an embodiment of the reproducing apparatus of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 indicates a magnetic head for control signals, and this magnetic head 1 for control signals records control signals in the longitudinal direction of the video tape and video signals recorded diagonally with respect to the longitudinal direction of the video tape. Tracking servo control is used to reproduce the control signal and control the phase of the video head so that the video head correctly traces the video track on the videotape. It was made to do so. One end of the control signal magnetic head 1 is grounded, and the other end is connected to the input terminal of the control signal reproducing amplifier circuit 2 via a DC blocking capacitor C, and the output from the control signal reproducing amplifier circuit 2 is Signal control signal detection circuit 3
The output signal from the control signal detection circuit 3 is supplied to one input terminal of the AND circuit 4. In this case, the control signal detection circuit 3 outputs a high level signal "1" which is approximately the power supply voltage as an output signal for a predetermined period of time when the control signal is not included in the signal supplied from the control signal reproducing amplifier circuit 2. ”, and outputs a low level signal “0” which is a ground potential as an output signal for a predetermined period of time when a control signal is included in the supplied signal.

On the other hand, one control signal output terminal 5 of a system control circuit (not shown) that controls the entire reproduction apparatus is connected to the other input terminal of the AND circuit 4. In this case, a high level signal "1" is outputted to the control signal output terminal 5 as a control signal only when the playback device is in the playback (PLAY) state.

Then, the output terminal of the AND circuit 4 is connected to the signal input terminal 6 of the system control circuit. These control signal magnetic head 1, capacitor C, control signal reproducing amplifier circuit 2, control signal detection circuit 3, and AND circuit 4 constitute a detection circuit 7 for detecting the presence or absence of a control signal. When a high level signal "1" is supplied from this detection circuit 7 to the signal input terminal 6 of the system control circuit, the system control circuit generates a command to execute CUE playback (or fast forward), and the playback device A playback (or fast forward) state is entered. Therefore, program A and program B ₁
Since there is no corresponding control signal in the transitional portion BLK, the playback device performs CUE playback (or fast-forwarding) of the transitional portion BLK.

In this example, one end of a resistor 9 is further connected to a power supply terminal 8 to which a positive DC voltage is supplied, and the other end of this resistor 9 is grounded via a switch 10.

In addition, the power supply voltage 8 is connected to a PNP type transistor 12.
The base of this transistor 12 is connected via a resistor 13 to the connection point of the resistor 9 and the switch 10.

The collector of the transistor 12 is connected to the connection point between the control signal magnetic head 1 and the capacitor C via the resistor 11.

Further, the connection point between the resistor 9 and the switch 10 is connected to the signal input terminal 15 of the system control circuit via the inverter circuit 14. in this case,
When a high level signal "1" is supplied to the signal input terminal 15, a muting circuit (not shown) is forced to be inactive during that time.
That is, when a control signal is not detected from the control signal magnetic head 1 in the reproduction state, the muting circuit stops the operation of a part of the amplifier circuit, etc., and operates so that the signal is not supplied to the cathode ray tube of the reproduction device. However, when a high level signal "1" is supplied to the signal input terminal 15, the system control circuit disables the muting circuit. Therefore,
When the switch 10 is turned on and DC erasure is performed on the control track of the videotape T, the muting circuit is rendered inactive even if no control signal is detected, so that the amplifier circuit in the playback device is stopped. Never. The rest of the structure is the same as the conventional one.

According to such a configuration, when playing back and watching movies B ₁ , B ₂ , etc. recorded on videotape T as shown in FIG. When the video is played, the viewer turns on the switch 10. At this time, power terminal 8
A current flows through the resistor 9 and the switch 10, turning on the transistor 12, and current flows from the power supply terminal 8 to the control signal magnetic head 1 through the transistor 12, and the control signal magnetic head 1 outputs a video signal. DC erasure is performed on the control signal recorded on the control track portion of the tape T. Furthermore, at this time, the switch 10 is turned on, and the inverter circuit 14 is turned on.
Since a low level signal "0" is supplied to the input terminal of the inverter circuit 14, a high level signal "1" is supplied from the inverter circuit 14 to the signal input terminal 15 of the system control circuit, and the muting circuit is rendered inactive.

In this way, when playing back and watching the videotape T from which the control signals of parts deemed unnecessary have been erased, the viewer simply performs the playback operation without any other operations. The portion required by the user is played back, and the unnecessary portion (the portion from which the control signal has been deleted) is placed in a CUE playback (or fast-forward) state. That is, the portion A where the control signal is recorded on the videotape T,
In _B1 and _B2 , an output signal including a control signal is obtained from the control signal magnetic head 1, amplified by the control signal reproducing amplifier circuit 2, and outputted as a low level signal "0" from the control signal detection circuit 3. ” is used as a control signal by the AND circuit 4
is supplied to At this time, a high level signal "1" indicating the reproduction state is supplied to the control signal output terminal 5, and this high level signal "1" is supplied to the other input terminal of the AND circuit 4. Therefore, as an output signal of the detection circuit 7, a low level signal "0" is supplied from the output terminal of the AND circuit 4 to the signal input terminal 6 of the system control circuit, and a reproduction state is established. Then, in the part of the commercial where no control signal is recorded on the videotape T, an output signal not containing the control signal is obtained from the control signal magnetic head 1, and this output signal is sent to the control signal reproduction amplifier circuit 2. The high level signal "1" is supplied from the control signal detection circuit 3 to the AND circuit 4 as a control signal. At this time, a high level signal "1" indicating the reproduction state is supplied to the control signal output terminal 5, and this high level signal "1" is supplied to the other input terminal of the AND circuit 4. Therefore, a high level signal "1" as an output signal of the detection circuit 7 is supplied from the output terminal of the AND circuit 4 to the signal input terminal 6 of the system control circuit, and a CUE playback (or fast forward) state is established.

In this way, once the control signal in the unnecessary part is deleted, the CUE playback (or fast forward) state is automatically set in the part where the control signal is deleted, that is, the control signal is not detected, and the unnecessary part is passed. You can watch the video in a shorter amount of time.

As described above, according to the present invention, once program B ₁ ,
You can arbitrarily erase the control signal of the videotape T by simply turning the switch 10 on and off for the parts you think are unnecessary, such as commercials _, etc., while watching the video tape T.
When a control signal is not detected, the portion where the control signal is not detected can be played back using CUE (or fast-forwarded) to shorten the time required to pass through the unnecessary portion for viewing.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the reproducing apparatus, and FIG. 2 is a configuration diagram showing an embodiment of the essential parts of the reproducing apparatus of the present invention. 1 is a magnetic head for control signals, 7 is a detection circuit, 8 is a power supply terminal, 9, 11 and 13 are resistors, 10 is a switch, and 12 is a PNP type transistor.

Claims (1)

[Claims for Utility Model Registration] A video signal is recorded in a direction diagonal to the longitudinal direction of a video tape, and a control signal for regulating the relationship between the video signal and a playback head in relation to the video signal is recorded in the longitudinal direction of the video tape. A playback device for playing back a videotape recorded on a videotape, comprising means for erasing only a desired control signal of the videotape, a detection means for detecting the presence or absence of the control signal during playback, and a response to the output of the detection means. and control means for controlling running of the videotape, and the control means causes the videotape to run at a faster speed than usual during a section in which the detection means does not detect the control signal. A playback device.