JPH0380638A - High-definition television receiver - Google Patents

Abstract

PURPOSE:To attain proper audio switching control automatically in response to the broadcast audio mode by allowing an audio switching decision means to control an audio switching means depending on the result of decision of a broadcast audio mode deciding means. CONSTITUTION:An audio switching decision means 14 controls an audio switching means 15 depending on the result of decision of a broadcast audio mode deciding circuit means 13 to output a sound for front left speaker to a 1st output, to output a sound for front right speaker to a 2nd output, to output a sound for front center speaker or added sound for front left and right to a 3rd output and to output a sound for rear center speaker or added sound for front left and right to a 4th output respectively at all times. Thus, the output of the same sound output in the front speaker sound mode and the rear speaker broadcast sound mode is avoided. Thus, proper sound switching control is implemented automatically in the broadcast sound mode.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-definition television receiver that automatically performs appropriate audio switching control depending on the broadcast audio mode.

Conventional technology The high-definition television broadcasting system uses detailed television images displayed on a large wide screen and 4-channel digital A/PCM audio to provide a powerful and realistic feeling that cannot be obtained with current television broadcasting. The aim is to seek out new attractions such as, and interest has been increasing in recent years in various countries. As a method for band compression of this high-definition television signal, M[jSX (Multipul Sub-N7q
ui! ! t Sampling BnOOd-ing
> The method has been proposed by the Japan Broadcasting Corporation (NHK'I). For details, see Tasuku Ninomiya et al., "Satellite 1-channel transmission method for high-definition television, Journal of IEICE Vol.
J68-D, 71h4, PP 647-65
4 (1985), Watanabe, Takegahara, "Non-Vision Semi-Instantaneous Compression DPCM Method for Audio Baseband Transmission, J Institute of Electronics, Information and Communication Engineers (March 1986).

The number of channels of the audio signal of this high-definition broadcasting is 4 channels (CH) in the 2nd mode.
As shown in the figure, for the viewer 27, - CH1 of Ibigon audio channel 21 is connected to the front left speaker 22, and CH2 is connected to the front left speaker 22.
to the front right speaker 24, and CH3 to the front center speaker 2.
3, the 4CH method (3-1) in which CH4 is assigned to the rear left speaker 26 and the rear right speaker 26, respectively.
Stereo (5 channels in the front, 1 channel in the rear, total 40H) broadcasting, high-definition audio channel/channel 31 to the front left speaker 32, as shown in Figure 3, for the viewer 36.
CH2 is assigned to the front right speaker 33, CH3 is assigned to the rear left speaker 34, and CH4 is assigned to the rear right speaker 36 (2-23 system 40H stereo (front 20H stereo)
, rearward 20H (total 40H) broadcasting, two 40H stereo broadcasts are being considered.

On the other hand, the configuration of a general high-definition television receiver is shown in FIG. The video signal processing means 41 is a MUSIC
Inputs a signal, demodulates the video signal and outputs it. The audio signal processing means 42 demodulates the audio signal multiplexed during the vertical retrace period of the video signal and outputs CH1, CH2, CH3, CH4.
It outputs an audio signal and also detects an audio control code for broadcast audio mode determination. The broadcast audio mode determining means 43 is
The broadcast audio mode determination control code detected by the audio signal processing means 42 is decoded to decode the broadcast audio mode. The four-person car four-output audio switching determining means 44 determines an appropriate audio switching method based on the broadcast audio mode determined by the broadcast audio mode determining means 43. 4 person car 4
The output audio switching means actually switches CH1 to CH41 demodulated by the audio signal processing means 42 based on the audio switching method determined by the 4-person car 4 output audio switching determining means 44.
The 40H audio signal is switched from the first output terminal to the fourth output terminal and outputted to the four output terminals.

Problems to be Solved by the Invention However, in the conventional configuration, there are only four audio output terminals, and it is not possible to produce appropriate audio for two types of 4CjH stereo broadcasting, the (3-1) method and the (2-2) method. There is no way to switch, so if you switch the audio and don't press the button,
Part 11: Connect the audio signal of CHl to the first output terminal, and
The audio signal of CH2 was output to the second output terminal, the audio signal of OHs was output to the third output terminal, and the audio signal of CH4 was output to the fourth output terminal.

Therefore, the first output terminal and the second output terminal are (3-
No matter which method is used, 11 method or (2-2) method,
The audio for the front left speaker and the audio for the front right speaker are output respectively, but the third output terminal outputs the audio for the front center speaker in the (3-1) method and the audio for the front center speaker in the (2-2) method. In this case, the audio for the rear left speaker is output, and the audio for the 4th speaker is output.
The output terminal outputs the audio for the rear speaker when using the (3-1) method, and the audio for the rear right speaker when using the (2-2) method. There is a problem in that each time the 4CH stereo system (2-2) is changed, the arrangement of the speakers connected to the third output terminal and the fourth output terminal must be changed.

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a high-definition television receiver that can automatically perform appropriate audio switching control depending on the broadcast audio mode.

Means for Solving the Problems In order to achieve the above object, the high-definition television receiver of the present invention provides a P
audio signal processing means for demodulating a CM audio signal into audio signals of first to fourth chuck μ; and broadcasting audio mode determining means for determining a broadcasting audio mode using audio control information detected by the audio signal processing means as an input signal. and audio adding means for adding the audio signals of the first and second channels demodulated by the audio signal processing means and adding the audio signals of the third and fourth channels, and a determination by the broadcast audio mode determining means. an audio switching determining means that determines an audio switching method based on the result; and an audio signal of the first to fourth channels demodulated by the audio signal processing means based on a control signal from the audio switching determining means, and the adding means that adds the audio signals of the first to fourth channels. The summed audio signals of the first and second channels, the third and fourth channels
The groove bottom is provided with at least an audio switching means for switching and outputting the added audio signals of the channels from the first output terminal to the fourth output terminal 1.

Operation The present invention uses the above-mentioned groove bottom to allow the audio switching determining means to determine whether the determination result of the broadcast audio mode determining means (in the case of the 40H stereo mode of the 3-13 system, the first channel demodulated by the audio signal processing means). the audio signal to the first output;
The audio signal of the second channel p is outputted to the second output, the audio signal of the third channel is outputted to the third output terminal, and the audio signal of the fourth channel is outputted to the fourth output terminal. The judgment result of the mode judgment means is 4C of method (2-2)
In the case of H stereo mode, the adding means adds the audio signal of the first chuck p demodulated by the audio signal processing means to the first output, and the audio signal of the second chuck p to the second output. 1st. The summed audio signal of the second channel is
By controlling the audio switching means to output the added audio signals of the 3rd and 4th channels to the 4th output respectively, appropriate audio switching control is automatically performed according to the broadcast audio mode. It can be carried out.

Embodiment FIG. 1 is a configuration diagram showing an embodiment of the present invention, and 11 is an MU
A high-definition video signal processing means inputs the SE signal and outputs demodulated video; 12 demodulates the audio signal multiplexed during the vertical retrace period of the video signal to CH1, CH2, CH3, CH;
Audio signal processing means 13 outputs the audio signal of 4 and detects a control code for determining the broadcast audio mode, and 13 is a broadcasting device that receives the audio control information detected by the audio signal processing means 12 as an input signal to determine the broadcast audio mode. Audio mode determining means; 16, audio signal adding means for adding the CH1 and OH2 audio signals demodulated by the audio signal processing means 12 and adding the OH3 and CH4 audio signals; 14, the determination result of the broadcast audio mode determining means 13; 15 is the audio signal of CH1, C3H5, CH3, CH4 demodulated by the audio signal processing means 12 according to the control signal from the audio switching determining means 14, and the audio signal adding means 16 This is an audio switching means that switches and outputs the added audio signal of Cu1 and CH2 and the added audio signal of CH3 and CH4 to four output terminals from the first output terminal to the fourth output terminal.

Next, the operation of the high-definition television receiver configured as described above will be explained with reference to FIG. The MUSIC signal is input to the video signal processing means 11, demodulated, and output as a video output. The audio signal multiplexed during the vertical retrace period of the video signal is demodulated by the audio signal processing means 12 and output to OH1 and OH.
Audio signals of CH2, CH3, and CH4 are output. At the same time, the audio signal addition means 16 adds and outputs the audio signals of CH1 and CH2, CH3 and CH4. Further, the broadcast audio mode is detected by the audio signal processing means 12 and determined by the broadcast audio mode determining means 13. The audio switching determining means determines that the determination result of the broadcast audio mode determining means 13 is (
3-1) In the case of 40H stereo, the audio signal of CHl demodulated by the audio signal processing means 12 is output as the first output,
The audio output means is controlled to output the audio signal of CH2 to the second output, the audio signal of CH3 to the third output, and the audio signal of CH4 to the fourth output, and the broadcast audio mode determining means 13 makes a determination. If the result is the 4CH stereo mode of method (2-2), the C demodulated by the audio signal processing means 12
The audio signal of Hl is sent to the first output, the audio signal of CH2 is sent to the second output, the added audio signal of OH1 and CH2 added by the audio signal adding means 16 is sent to the third output, and the audio signal of OH3 and CH4 is sent to the third output.
The audio switching means is controlled to output the added audio signals to the fourth outputs, respectively.

According to the configuration of the above embodiment, the broadcast audio mode is (3-
Regardless of whether it is 40H stereo of the 11 system or 40H stereo of the (2-2) system, the audio switching determining means controls the audio switching means based on the determination result of the broadcast audio mode determining means, so that the sound is always forward. The audio for the left speaker is sent to the first output, the audio for the front right speaker is sent to the second output, the audio for the front center speaker or the addition of the audio for the front left and right speakers is sent to the third output, and the audio for the front right speaker is sent to the third output. Subi・
The audio of one corner or the added audio of the audio for the front left and right speakers is output to the fourth output, so the audio for the front speakers and the audio for the rear speakers are output from the same audio output in the broadcast audio mode. This eliminates the problem, and it is possible to automatically perform appropriate audio switching control according to the broadcast audio mode.

Effects of the Invention As is clear from the above embodiments, the present invention has the advantage that even if the broadcast audio mode is (3-1) 40H stereo,
-2) Even with 40H stereo, the audio for the front left speaker is always sent to the first output, the audio for the front right speaker is sent to the second output, and the audio for the front center speaker is sent to the third output. Then, the audio switching determining means controls the audio switching means according to the determination result of the broadcast audio mode determining means so that the audio for the rear speakers is output to the fourth output, respectively, so that the audio switching means controls the audio switching means according to the determination result of the broadcast audio mode determining means. Accordingly, it is possible to realize a high-definition television receiver having the excellent effect of automatically performing appropriate audio switching control.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a high-definition television receiver according to an embodiment of the present invention, and FIG.
A block diagram explaining the 0H stereo system, Figure 3, is (2
-2) A block diagram for explaining the 40H stereo system. FIG. 4 is a block diagram showing the configuration of a conventional example. 11... Video signal processing means, 12...
Audio signal processing means, 13... Broadcasting audio mode determining means, 14... Audio switching determining means, 16...
...Audio switching means.

Claims (1)

[Scope of Claims] Audio signal processing means for demodulating a PCM audio signal of MUSE system high-definition television broadcasting into audio signals of first, second, third, and fourth channels; and the audio signal processing means detects broadcast audio mode determining means for determining a broadcast audio mode using the input audio control information as an input signal, and adding the audio signals of the first channel and the second channel demodulated by the audio signal processing means, audio addition means for adding the audio signals of the broadcast audio mode determining means; audio switching determining means for determining an audio switching method based on the determination result of the broadcast audio mode determining means; and a control signal from the audio switching determining means to control the audio signal processing means. The demodulated audio signals of the first to fourth channels, the added audio signals of the first channel and the second channel added by the adding means, and the added audio signals of the third channel and the fourth channel are 4 from output 1 to output 4
At least an audio switching means for switching the output to one of two outputs, and the audio switching determining means is configured to select the first stereo mode demodulated by the audio signal processing means when the determination result of the broadcast audio mode determining means is the first stereo mode. The audio signal of the channel is sent to the first output, and the audio signal of the second channel is sent to the second output.
The audio signal of the third channel is outputted to the third output, and the audio signal of the fourth channel is outputted to the fourth output, respectively, and the determination result of the broadcast audio mode determining means is outputted to the second stereo output. mode, the audio signal of the first channel demodulated by the audio signal processing means is outputted as the first output;
The audio signal of the second channel is sent to the second output, the added audio signal of the first channel and the second channel is sent to the third output, and the added audio signal of the third channel and the fourth channel is sent to the fourth output. A high-definition television receiver, characterized in that the high-definition television receiver is configured to control an audio switching means to output the respective outputs.