JPH0434226B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement in a VTR that records audio and screen from a television device.

[Conventional technology and problems]

Traditionally, audio and screen were transmitted from television equipment.
When recording with a VCR, especially when setting the time and recording automatically, it was inevitable that commercials that one did not want to see had to be recorded.

Approximately, in a 60-minute TV program, 15 to
About 20 minutes are occupied by commercials. In the case of commercial broadcasting, it is unavoidable that there are commercials, and there may be times when you want to watch commercials, but for the most part,
For viewers, it is better not to watch commercials unless you watch them.

When recording while watching a television set, it is possible to skip commercials while recording, but it is still undeniably troublesome.
Also, if you wanted to set a time and record while you were away, the commercial would end up being recorded. This also results in waste of video discs or video tapes.

The object of this invention is to provide a VTR that can record commercials without skipping them.

[Means for solving problems]

This invention derives a reference value obtained by long-term averaging of audio signals, and also derives a reference value from a current signal indicating the current state obtained by averaging the audio signal for a short time before the present moment. Compare,
When the current signal is larger than the reference signal, the VTR
The video signal is now prevented from being recorded.

[Effect]

According to this invention, a reference value can be derived from a video signal moment by moment in conjunction with its situation,
A commercial can be found eligible and can be prevented from being recorded.

[Embodiment] Fig. 1 is a block diagram of a VTR showing an embodiment of the present invention, where 100 is a discriminator, 1 is an audio signal detector, and 2 is a reference value obtained by averaging the audio signals from the current time to one minute ago. 3 is a current signal calculation circuit that averages audio signals from the current time up to 6 seconds ago to derive a current signal indicating the current state; 4 is a current signal calculation circuit that matches the levels of the reference value and the current signal. 5 is a comparator, which calculates the difference between the reference signal and the current signal from the current signal calculation circuit 3 via the coefficient device 4, and if the absolute value of the difference signal exceeds a certain value, a control signal is sent. It is something that emits. 6 is a delay circuit that delays the video signal by 100 μsec. 7
8 is a recording device, and 8 is a gate circuit, which closes or opens the gate according to a signal from the comparator 5.

Next, the operation of FIG. 1 will be explained with reference to the waveform diagram of FIG. 2. The audio signal shown in FIG. 2A is detected from the video signal and the audio signal by an audio signal detector. Generally speaking, the audio signal during a commercial is several times louder than when it is normally aired, as shown in the commercial in Figure 2A. When this audio signal is averaged for one minute by the reference signal calculation circuit 2, the result is as shown in FIG. 2B. On the other hand, in order to know the current state, the audio signal is averaged for 5 seconds by the current signal calculation circuit 3 to obtain the signal shown in FIG. 2C. When the comparator 5 derives the difference between the reference value passed through the coefficient unit for level matching and the current signal, the signal shown in FIG. 2D is obtained. When this difference signal exceeds a certain value 1, +P and -P signals including polarity are sent to the gate circuit 8. The gate circuit 8 prevents the video signal from going to the recording device 7 when the signal +P comes, and allows the video signal to go to the recording device 7 when the signal -P comes.

Further, when the recording device 7 receives the signal +P from the comparator circuit 5, it stops its operation and outputs the signal -P.
It will start working again when the time comes.

Normally, commercials are performed at intervals of 10 minutes or more, so it is also possible to operate the gate circuit 8 recording device 7 with the condition that 10 minutes or more have passed since the previous commercial to reduce malfunctions. useful for.

〔Effect of the invention〕

As described above, according to the present invention, commercials can be automatically detected and commercials can be automatically skipped during recording.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining FIG. 1. In the figure, 1 is an audio signal detector, 2 is a reference signal calculation circuit, 3 is a current signal calculation circuit, 4 is a coefficient unit, and 5
is a comparator, 6 is a delay circuit, 7 is a recording device, and 8 is a gate circuit.

Claims (1)

[Claims] 1. A recording device that records a video signal consisting of an audio signal and an image signal, and a reference signal calculation that derives a reference value obtained by averaging the audio signals of the video signal over a long period of time before the present time. a current signal calculation circuit that derives a current signal indicating the current state obtained by averaging the audio signal of the video signal for a short time before the current time; a reference signal from the reference signal calculation circuit and the current signal calculation circuit; a comparison circuit that compares the magnitude of the current signal from the reference signal and derives a signal when the current signal is larger than the reference signal;
A VTR comprising a gate circuit that receives a signal from the comparison circuit and prevents the video signal from being introduced into the recording device. 2. A VTR as set forth in claim 1, wherein the recording device records a video signal delayed for a certain period of time.