JP2000350144A - Video reproducing device and video signal setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video reproduction device that can optically set a video signal automatically in response to a bit rate and to provide a video signal setting method dealing with the bit rate. SOLUTION: A television receiver 10 includes video circuits 11, 12, 13, 14 that display a video image on a display section 16 on the basis of a received video signal and a control section 16 that controls the video circuits. The control section 15 controls the video circuits 12, 13 at a bit rate based at that time on bit rate information of an optical disk outputted from an optical disk unit to reproduce the optical disk adopting a variable transfer rate system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video reproducing apparatus such as a television receiver and a monitor, and more particularly to a method for automatically setting a variable transfer rate type optical disk according to the bit rate.

[0002]

2. Description of the Related Art Recently, variable transfer rates (bit rates) have been developed.
2. Description of the Related Art An optical disk of a system, for example, a so-called digital video disk (hereinafter referred to as a DVD) has been widely used. An optical disk device for reproducing such a DVD or the like reads bit rate information written on an optical disk at the time of video reproduction, and transfers the bit rate information based on the bit rate information in response to a change in the state of an image. The amount of data to be transmitted is specifically allocated. Specifically, the bit rate is 3 Mbp.
When the bit rate is about 6 Mbps, the compression rate is low, and when the bit rate is about 10 Mbps, the compression rate is low. High quality images.

[0003] For this reason, the compression rate is high near the bit rate of 3 Mbps. For example, in the case of "MPEG2" video widely used in DVD playback optical disc apparatuses, if the compression rate in the high frequency band of the video frequency is high. That is, so-called mosquito noise is easily generated. In this case, for example, on the side of the television receiver having an external input terminal to which a signal from the optical disk device is input, an image without noise can be obtained by increasing the intensity of noise reduction and lowering the resolution. .

On the other hand, the bit rate is 6 Mbps.
In the vicinity, while reducing the intensity of noise reduction,
By setting the resolution to medium, an easy-to-view image is obtained, and when the bit rate is around 10 Mbps,
Since the compression ratio is high, the sharpness of an image can be increased by increasing the resolution without applying noise reduction.

[0005]

However, since the setting of the noise reduction and the sharpness on the television receiver side is constant, when reproducing an optical disk of the variable transfer rate system in which the bit rate continuously changes, However, it has always been difficult to obtain an optimum reproduced image.

In view of the above, the present invention provides a video reproducing apparatus and a video signal setting method which can automatically set a video signal optimally according to a bit rate amount. It is an object.

[0007]

According to the first aspect of the present invention, there is provided a video circuit for displaying a video on a display unit based on an input video signal, and a control unit for controlling the video circuit. The control unit, based on the bit rate information of the optical disk output from the optical disk device for reproducing the optical disk of the variable transfer rate system, the video circuit corresponding to the amount of the bit rate at that time This is achieved by a video playback device having a control structure.

According to a second aspect of the present invention, the video circuit includes a noise reduction circuit that removes noise of an input video signal, and a sharpness circuit that adjusts the sharpness of an image. The noise reduction circuit and / or the sharpness circuit are controlled on the basis of bit rate information of an optical disk output from an optical disk device for reproducing an optical disk of a variable transfer rate system.

According to the third aspect of the present invention, the eye object is provided on a display unit by a video circuit based on a video signal output from an optical disk device for reproducing an optical disk of a variable transfer rate system. A method for setting a video signal of a television receiver that drives a speaker by an audio circuit based on an audio signal, based on the audio signal, wherein the video signal is set based on bit rate information of an optical disk output from the optical disk device. This is achieved by a video signal setting method in which a video signal is set by controlling a circuit.

According to the first aspect of the present invention, at the time of reproducing the optical disk of the variable transfer rate system, the video reproducing device or the television receiver uses the bit rate information of the optical disk read by the optical disk device. The control unit controls based on the bit rate information in accordance with the bit rate at that time. Specifically, a video circuit, for example, a noise reduction circuit and / or
Alternatively, by controlling the sharpness circuit, the optimum noise reduction strength is set with respect to the image compression ratio at the bit rate, and the sharpness, that is, the resolution is set. As a result, the control section controls the video circuit, so that the intensity and resolution of the noise reduction of the video signal are always automatically set to the optimum state.

For example, when the bit rate is high, since the image is a high-quality image with a low compression rate, the setting is performed so as to reduce the sharpness without applying noise reduction, and the bit rate is low. in case of,
Since it is a low-quality image with a high compression ratio, settings are made to increase the noise reduction and sharpness. At an intermediate bit rate, since the image is of average quality, noise is reduced. The setting is made so that the reduction is weakened and the sharpness is moderate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to FIGS. still,
Since the embodiments described below are preferred specific examples of the present invention, various technically preferred limitations are added.
The scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 shows a configuration of a video circuit of a television receiver to which an embodiment of a video signal bit rate setting method according to the present invention is applied. In FIG.
For example, a television receiver 10 as a video device includes a demodulator 11, a noise reduction circuit 12, a sharpness circuit 13, a video amplification circuit 14, a noise reduction circuit 12, and a noise reduction circuit 12 provided in the demodulator 11. A microcomputer 15 as a control unit for controlling the circuit 13 and a display unit 16 are provided.

The demodulator 11 has an external video input terminal 17
, A luminance signal and a chrominance signal are extracted from these video signals. Alternatively, the demodulator 11 may include a receiving unit (not shown), and may be configured to input a video signal extracted by detecting a radio wave received by the receiving unit by a detecting unit.

The noise reduction circuit 12 removes noise contained in a video signal, for example, a mosquito noise generated at a high compression ratio in a high frequency band of a video frequency.

The sharpness circuit 13 adjusts the sharpness of the image by appropriately processing the video signal, for example, by enhancing the outline of the image. The video amplification circuit 14 adjusts the video signal to an appropriate level by amplifying the video signal.

The microcomputer 15 functions as a control unit. That is, the microcomputer 15
, Bit rate information is input from an external bit rate input terminal 18. The microcomputer 15 controls the noise reduction circuit 12 and the sharpness circuit 13 based on the bit rate information. Thus, the intensity of the noise reduction by the noise reduction circuit 12 is adjusted, and the sharpness of the image is adjusted by controlling the sharpness circuit 13.

Here, when the bit rate is low, for example, less than 4 Mbps, the microcomputer 15
The noise reduction circuit 12 and the sharpness circuit 13 are controlled so that noise reduction is increased and sharpness is reduced. When the bit rate is medium, for example, 4 Mbps or more and less than 7 Mbps, the microcomputer 15 controls the noise reduction circuit 12 and the sharpness circuit 13 so that the noise reduction is weakened and the sharpness is medium. . Further, when the bit rate is high, for example, not less than 7 Mbps and less than 10 Mbps, the microcomputer 15 does not apply noise reduction but increases the sharpness.
And the sharpness circuit 13 is controlled.

As the display unit 16, not only a television receiver using a cathode ray tube, but also various display devices such as a liquid crystal display device or a plasma display or a video display device such as a monitor device is used.
An image is displayed on a screen based on an input video signal.

Here, the external video input terminal 17 has:
A video signal from an external DVD reproducing optical disk device 20 is input. External DVD playback optical disk device 20
Incorporates a microcomputer 21 as a control device. The microcomputer 21 acquires a bit rate of a video signal with respect to a video recorded on an optical disk, and reproduces the video signal based on the bit rate. I have. Therefore, the video bit rate data read from the optical disc in the DVD reproducing optical disc device 20 is supplied to the external bit rate input terminal 18 of the television receiver 10 via the microcomputer 21 which is a built-in control unit. Is to be entered.

The television receiver 10 according to the present embodiment
Is configured as described above, and operates as follows according to the flowchart shown in FIG. First, in step ST1, a video signal is input from the DVD reproducing optical disc device 20 to the demodulator 11 via the external video input terminal 17, and bit rate information is input to the demodulator 11 via the external bit rate input terminal 18. The data is input to the microcomputer 15.

Next, when the microcomputer 15 receives the bit rate information in step ST2, the microcomputer 15 determines the current bit rate based on the bit rate information in step ST3, that is, when the bit rate is 4M.
less than 4 bps, 4 Mbps or more and less than 7 Mbps or 7
It is determined whether the speed is between Mbps and 10 Mbps.

If the bit rate is less than 4 Mbps, the microcomputer 15 controls the noise reduction circuit 12 to apply strong noise reduction and controls the sharpness circuit 13 in step ST4. , Weaken the sharpness. As a result, for a video having a high compression rate and inferior quality,
The generated mosquito noise is removed by noise reduction.

The bit rate is 4 Mbps or more and 7 Mbps.
If it is less than bps, in step ST5, the microcomputer 15 controls the noise reduction circuit 12 to weaken the noise reduction and controls the sharpness circuit 13 to make the sharpness moderate.

Further, if the bit rate is 7 Mbps or more and 1
If it is less than 0 Mbps, in step ST6,
The microcomputer 15 controls the noise reduction circuit 12 to control the sharpness circuit 13 without applying noise reduction, thereby increasing the sharpness. As a result, an image with high sharpness can be obtained by increasing the sharpness of a high-quality image with a low compression ratio.

As a result, the noise reduction and sharpness setting corresponding to the bit rate are automatically performed. The video signal input from the external video input terminal 17 is demodulated by the demodulator 11 and the noise is reduced. After the noise reduction is removed by the reduction circuit 12, the sharpness is improved by the sharpness circuit 13 and then amplified by the video amplifier circuit 14, and
Is input to Thus, an image based on the image signal is displayed on the display unit 16. At this time, the video
Since the optimal noise reduction and sharpness settings corresponding to the bit rate at that time have been made,
It will be automatically adjusted to the optimal state.

The automatic setting corresponding to the bit rate is as follows.
During playback of the optical disk, when the bit rate changes and new bit rate information is read out by the optical disk device 20, the bit rate information is input to the microcomputer 15 from the external bit rate input terminal 18 each time. . Accordingly, during reproduction of the optical disk, the microcomputer 15 controls the noise reduction circuit 12 and the sharpness circuit 13 in accordance with the bit rate at that time, and the optimum noise reduction and sharpness in accordance with the bit rate at that time. Will be set. In this manner, according to the television receiver of the present embodiment, the user can always view the video in an optimal state corresponding to the bit rate without being conscious of the change in the bit rate, and thus without making any settings. Can be seen.

In the above-described embodiment, the case of the television receiver 10 has been described. However, the present invention is not limited to this, and a video reproducing apparatus, for example, a so-called monitor television without a receiving unit and a detecting unit and an audio circuit, a display, It is clear that the present invention can be applied to a so-called television tuner or the like having no unit. Further, in the above-described embodiment, the optical disk device 20 is for DVD reproduction, but is not limited thereto, and may be another optical disk device for an optical disk of a variable transfer rate system. Instead, an optical disk device for recording / reproduction may be used.

[0029]

As described above, according to the present invention, a video reproducing apparatus and a video signal setting method capable of automatically setting a video signal optimally according to a bit rate amount. Is provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a television receiver for implementing a method of setting a bit rate corresponding to a video signal according to the present invention.

FIG. 2 is a flowchart showing a bit rate amount setting operation in the television receiver of FIG. 1;

[Explanation of symbols]

10 ... television receiver, 11 ... demodulator, 1
2 ... noise reduction circuit, 13 ... sharpness circuit, 14 ... video amplifier circuit, 15 ... microcomputer (control unit), 16 ... display unit, 17
..External video input terminal, 18 ... External bit rate input terminal, 20 ... DVD playback optical disc device, 21
... Microcomputer.

Claims (5)

[Claims] 1. An image processing apparatus, comprising: a video circuit for displaying a video on a display unit based on an input video signal; and a control unit for controlling the video circuit. A video reproducing apparatus characterized in that the video circuit is controlled based on bit rate information of an optical disc output from an optical disc apparatus for reproduction, in accordance with a bit rate at that time. 2. The video circuit includes a noise reduction circuit that removes noise of an input video signal and a sharpness circuit that adjusts the sharpness of an image. 2. The video reproducing apparatus according to claim 1, wherein the noise reduction circuit and / or the sharpness circuit are controlled based on bit rate information of the optical disk output from the optical disk apparatus for reproducing the optical disk. . 3. A video circuit reproduces a video on a display unit based on a video signal output from an optical disc apparatus for reproducing an optical disc of a variable transfer rate system, and also controls an audio circuit based on a voice signal. A video signal setting method for a television receiver for driving a speaker, comprising: controlling a video circuit based on bit rate information of an optical disk output from the optical disk device to set the video signal. Characteristic video signal setting method. 4. By controlling a noise reduction circuit of a video circuit based on the bit rate information,
4. The video signal setting method according to claim 3, wherein an optimal noise reduction intensity is set for the bit rate at this time. 5. A video signal according to claim 3, wherein a resolution corresponding to the bit rate at this time is set by controlling a sharpness circuit of the video circuit based on the bit rate information. How to set.