JP2001036869A - Video and audio delay controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video and audio delay controller which eliminates deviation between a video signal and an audio signal. SOLUTION: This video and audio delay controller has a first video signal processing means 13 for processing a normal video signal, a second video signal processing means 14 for delaying a video signal telecine converted for a specified time and performing scanning line conversion processing to the telecine converted video signal, and an audio signal delay circuit 16 for delaying an audio signal for a specified time and outputting it. It is constituted so that, when a second video signal switching circuit 15, which selectively outputs output signals of first and second video signal processing means 13 and 14 in accordance with a control signal from a control circuit 11, outputs the normal video signal, the audio signal is outputted as it is by a second audio signal switching circuit 17 and that, when the telecine converted video signal is outputted, the audio signal passing through the audio signal delay circuit 16 is outputted by the second audio signal switching circuit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio delay control apparatus which is applied to video signal processing in which a video signal is delayed in units of fields or frames, for example, when progressive scan conversion is performed.

[0002]

2. Description of the Related Art When performing a scan line conversion process on a video signal obtained by telecine converting a film image by a 2-3 pull-down method or the like, the signal is delayed in units of fields or frames. In such a case, a gap occurs between the video and the audio.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been developed in consideration of the signal processing content of a video signal. It is an object of the present invention to provide a video and audio delay control device capable of eliminating a difference between a video signal and an audio signal by matching the two.

[0004]

According to a first aspect of the present invention, there is provided a video / audio delay control apparatus for performing a signal processing in which a delay of a predetermined time does not occur with respect to a first video signal. First video signal processing means for performing, a second video signal processing means for performing signal processing for generating a delay of the predetermined time on the second video signal, a control circuit for generating a control signal, and a control signal A video signal switching circuit for selectively outputting the output signals of the first and second video signal processing means based on the signal, an audio signal delay means for receiving an audio signal and delaying the output by the predetermined time, and a control signal An audio signal switching means for selectively outputting one of an audio signal and an output signal of an audio signal delay means based on the audio signal and a fader process on the output signal of the audio signal switching means in response to the audio signal switching. Means to apply Characterized in that it.

According to a second aspect of the present invention, there is provided the video and audio delay control device according to the first aspect, wherein the second video signal is a telecine-converted video signal, The signal processing in the second video signal processing means is a scanning line conversion process for a telecine-converted video signal.

A video / audio delay control device according to the present invention includes first video signal processing means for performing signal processing on a first video signal, which is a normal video signal, without delay of a predetermined time, and telecine-converted first video signal processing means. A second video signal processing means for performing a scan line conversion process on the telecine-converted video signal by giving a delay of a predetermined time to the second video signal which is a video signal, and delaying the audio signal by the predetermined time. And a video signal switching circuit for selectively outputting output signals of the first and second video signal processing means in response to a control signal from the control circuit. When outputting, the audio signal switching means outputs the audio signal as it is, and when the video signal switching circuit outputs the second video signal, the audio signal passing through the audio signal delay means by the audio signal switching means The output signal and fader processing are applied to the output signal, so that the delay amount of the video signal and the delay amount of the audio signal can be matched according to the signal processing content of the video signal. Can be eliminated. Further, the noise at the time of switching the audio signal is reduced by the fader processing.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a video / audio delay control device according to an embodiment of the present invention. A first video signal switching circuit (selector) 10 converts a first video signal V1 from a video game or the like and a film image into two based on a control signal given from a control circuit 11.
NT including video that has been telecine-converted by 3 pull-down method
One of the second video signals V2 of the progressive scanning such as the SC system is selectively output. The first audio signal switching circuit (selector) 12 outputs a video signal V from a video game device or the like based on a control signal given from the control circuit 11.
1 and the video signal V of the above progressive scanning
2 is selectively output.

The first video signal processing means 13 performs signal processing on the video signal V1 output from the first video signal switching circuit 10 so as not to cause a predetermined time delay. on the other hand,
The second video signal processing unit 14 delays the second video signal V2 by a predetermined time (field or frame delay).
Is performed (for example, a progressive scan conversion process). The second video signal switching circuit (selector) 15 outputs the outputs V 1 ′, V 2 ′ of the first or second video signal processing means 13, 14 based on the control signal given from the control circuit 11.
Is selectively output.

On the other hand, the audio delay circuit 16 delays the audio signal supplied from the first audio signal switching circuit 12 by the amount of delay generated by the signal processing in the second video signal processing means 14 and outputs it. The second audio signal switching circuit 17 selectively selects one of the audio signal supplied from the first audio signal switching circuit 12 and the output signal of the audio delay circuit 16 based on a control signal supplied from the control circuit 11. Output to The fader amplifier 18 performs fader processing such as fade-in and fade-out on the output signal of the second audio signal switching circuit 17 based on a control signal given from the control circuit 11.

The sync separation circuit 19 separates the sync signal from the video signal selected by the first video signal switching circuit 10 and converts the sync signal to the control circuit 11, the first and second video signal processing circuits 13 and 14. To supply. The control circuit 11 responds to a switching command signal from the input switching operation means 20 and synchronizes with the vertical synchronizing signal of the video signal, and switches the first and second video signal switching circuits 10 and 15, the first and second audio signals. Signal switching circuit 12,
17, control signals for signal switching, first and second
And a control signal for the fader amplifier 18 are generated and output.

Next, the operation of the video / audio delay control device thus configured will be described with reference to FIG. First, in FIG. 2, during the period from t0 to t1, the input switching operation means 20 causes the first video signal V1 and the audio signal A thereof.
1 is set to be selected and output, the first video signal switching circuit 10 switches the first video signal V1 to the first video signal V1.
And the second video signal switching circuit 15 selectively outputs the output signal V1 'of the first video signal processing means 13, and outputs the first audio signal switching circuit 12 Selectively outputs the audio signal A1, and the second audio signal switching circuit 17 selectively outputs the audio signal A1 (A00) (a period from t0 to t1 in FIG. 2).
In this case, the first video signal processing means 13 performs signal processing on the video signal (first video signal V1) from a video game or the like so that no delay occurs.
(A) and the output video signal V1 'as shown in FIG.
Has no delay with respect to the input video signal V1. Therefore, the output audio signal A1 (A00) from the second audio signal switching circuit 17 is also output without delay, as shown in FIG.

Next, by the input switching operation means 20, t
The input / output is switched at the timing of 1 to change the second video signal V
When a switching command signal for selecting and outputting the audio signal A2 and the switching signal is generated, the control circuit 11 generates a control signal in response to the switching command signal and in synchronization with the vertical synchronizing signal of the video signal. Of the second video signal V
2 is selectively supplied to the second video signal processing means 14, and the second video signal switching circuit 15
4, the first audio signal switching circuit 12 selectively outputs the audio signal A2, and the second audio signal switching circuit 17 outputs the output audio signal from the audio delay circuit 16. The output signals from the first and second video signal switching circuits 12, 15 and the first and second audio signal switching circuits 12, 17 are switched so as to output A01.

By the switching of the video signal, the output video signal V2 'from the second video signal processing means 14 is output from the second video signal switching circuit 15. In this case, FIG.
As shown in (b) and FIG. 2 (d), the signal processing in the second video signal processing means 14 causes a delay of, for example, two field periods, but as shown in FIG. 2 (e), the video signal V2 ' Output audio signal A from the audio delay circuit 16 delayed by, for example, two field periods in accordance with the delay amount of
01 is output. At the same time as the control signal for signal switching described above, the control circuit 11 generates a control signal for the fader amplifier 18 so that the second audio signal switching circuit 17
For the predetermined period T shown in FIG.
Fader processing such as fade-in and fade-out is performed.

As described above, when the video signal processing is switched in response to the switching of the input video signal, the audio signal is delayed and output in accordance with the delay amount generated by the video signal processing, so that the video and audio can be separated. Deviation can be avoided. Further, by performing the fader processing in synchronization with the switching of the audio signal accompanying the switching of the input video signal, it is possible to prevent the pop signal from being generated in the audio signal. In the case where the delay amount due to the video signal processing changes in a plurality of stages such as two stages or three stages according to the form of the video signal, the audio delay amount in the audio delay circuit is adjusted accordingly. Is also good.

[0015]

According to the present invention, since the delay amount of the audio signal is adjusted to the delay amount of the video signal at that time according to the content of the signal processing of the video signal, the difference between the video signal and the audio signal is obtained. Misalignment can be eliminated. Further, the noise at the time of switching the audio signal is reduced by the fader processing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a video / audio delay control device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the device in FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 first video signal switching circuit 11 control circuit 12 first audio signal switching circuit 13 first video signal processing means 14 second video signal processing means Reference numeral 15: second video signal switching circuit 16: audio delay circuit 17: first audio signal switching circuit 18: fader amplifier 19: synchronization separation circuit 20: input switching operation circuit

Claims (2)

[Claims] 1. A first video signal processing means for performing signal processing on a first video signal so as not to cause a delay of a predetermined time, and a signal for generating a delay of the predetermined time on a second video signal. Second video signal processing means for performing processing, a control circuit for generating a control signal, and a video signal switching circuit for selectively outputting output signals of the first and second video signal processing means based on the control signal An audio signal delay means for inputting an audio signal and delaying the output by the predetermined time, and selectively outputting one of the audio signal and an output signal of the audio signal delay means based on the control signal A video / audio delay control device, comprising: audio signal switching means; and means for performing a fader process on an output signal of the audio signal switching means in response to the switching of the audio signal. 2. The video signal according to claim 1, wherein the second video signal is a telecine-converted video signal, and the signal processing in the second video signal processing means is a scanning line conversion process for the telecine-converted video signal. Item 3. The video / audio delay control device according to Item 1.