JPH04207875A - High definition television receiver - Google Patents

Abstract

PURPOSE:To enable a 3-1 system 4-channel stereos to be enjoyed with 2-channel stereos as well by using a sound switching means which outputs the sound signals added by a same phase adding means and opposite phase adding means when a received sound signal is a 3-1 stereo sound mode. CONSTITUTION:The sound switching means 16 outputs the sound signals added by the 14 same phase adding means and the opposite phase adding means 15 when a sound mode deciding means 13 decides that the received sound signal is the 3-1 stereo sound mode. Consequently, the 3-1 stereo sounds can be converted to the 2-channel stereos. In addition, the 4th channel CH 4 to send the surrounding sounds is added in opposite phase to the 1st and 2nd channels which sends the right and left sounds. Then, the 3-1 system 4-channel stereos can be enjoyed with the 2-channel stereos as well without impairing the surrounding effect.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-definition television receiver that can enjoy 3-1 system 4-channel stereo and 2-channel stereo.

Conventional technology for high-definition television is the ability to display detailed and powerful television images on a wide screen, and
Using digital PCM audio on CH, the program aims to create a new appeal, such as power and realism that cannot be obtained with current television broadcasting, and there has been a high level of interest in this program in recent years in various countries.

This scrapped TV signal? MUS as a method to measure bandwidth
E (Multipul Sub-NyquisL
A sampling encoding method has been proposed by the Japan Broadcasting Corporation (NHK). For a review of the content, see Yu Ninomiya et al., “Satellite 1-channel transmission system for high-definition television,” IEICE Theory ff, Vol. J 68-
D, No, 4゜PP 647~654 (198
5) , Watanabe, Takeke IM: - No A Vision Audio Baseband Transmission RV - 2 Time Pressure, 1) PCM System,” Denshi Information Technology Society (March 1986) VC demonstrated this high quality There are 4 CHs (channels) of the audio signal of television broadcasting on A side and VC2, and as shown in Fig. The front left speaker 3 to the first channel CH1, the second chitsuki IvCH2, the right speaker 4, the front center speaker 5 to the third channel CH3', the rear left speaker 6 and the rear to the fourth channel CH4 The right speaker 7 hits each harm i4 3-
10,000-type 4CH stereo (3CH in the front, 1CH in the rear, total 4CH) broadcasting power is being considered.

In contrast, a conventional high-definition television receiver generally has a configuration shown in FIG. 3.

The video signal demodulation means 8 inputs the &fUSE @ signal, demodulates the video signal by multiplying it by "Pj'" and outputs it.The audio signal demodulation means 9
demodulates the audio (H signal) multiplexed in the vertical/station line period of the video signal and outputs it to the 1st E- to 4th channels CHI-
Outputs the audio signal of CH4. Audio mode determination means lO
determines the audio mode by inputting the audio control code detected by the audio signal demodulating means 9.

Problems to be Solved by the Invention However, in the conventional configuration, the sound 7 city mode determination means 1
When set to 0/3-1 stereo mode, the first
Since the audio signals of the fourth channels CHI to CH4 are output as they are, when it is not possible to use two channels as an audio speaker, or when recording is limited to two channels of audio, the 3-1 stereo There was a problem that it was not fully effective.

In order to solve the above-mentioned problem, the present invention aims to provide a high-quality television that can enjoy 3-1 type 4-channel stereo as well as 2-channel stereo.

Means for Solving the Problems In order to solve the above problems, the high-definition television license of the present invention is based on the MUSE system high-definition television broadcasting
an audio signal demodulating means for modulating the CM audio signal from the first to the fourth audio signal; and adding the third channel demodulated by the demodulating audio signal demodulating means to the first and second channels in the same phase. an in-phase addition means for adding the fourth channel demodulated by the demodulation means to the first and second channels in opposite phases; audio mode determining means for determining the audio mode by inputting an audio control code; and audio signals of the first to fourth channels demodulated by the audio demodulating means and the audio signals added by the in-phase addition means and the anti-phase addition means. Cut 9
The configuration also includes a voice switching means for outputting the voice.

Operation With the above configuration, the voice mode determining means
When it is determined that J15' is in the 3-1 stereo audio mode, the audio selection means outputs all 8 audio signals added by the in-phase addition means ν and the anti-phase addition means, so that the 3-1 stereo audio becomes all 2 channel stereo. What's more, the 4th channel that sends the surround sound is exposed to the 1st and 2nd channels that send the left and right sounds in opposite phase, so the surround effect is not impaired.
-1 system 4-channel stereo can be broadcast as 2-channel stereo.

Embodiment FIG. 1 is a block diagram showing the main parts of a high-definition television receiver according to an embodiment of the present invention.
2, voice mode determining m13, and in-phase addition means 14
, an anti-phase addition means 15, and an audio cutting means 16. Here, the video signal demodulation means 11 uses MUSE
Input the double code and output the demodulated video.

The audio signal demodulating means 12 demodulates the audio signal multiplexed during the vertical retrace period m of the video signal and outputs it to the first to fourth channels C.
Outputs the audio signal of HI-CH4. The voice mode determining means 13 uses the voice control code detected by the voice signal demodulating means 12 as an input signal and adds all the voice modes. The in-phase addition means 14 adds the third channel CHa demodulated by the audio signal demodulation means 12 to the first and second channels CHI, CH.
2I/C direction phase is added. The fourth channel CH4 demodulated by the audio signal demodulation means 12 is added to the reverse phase addition signal 15.
2 and the second channels CH1 and CH2 are added with slightly opposite phases. Voice cut 9 fighting means 16 - Philosophy mode judgment +
When the stage 13 also determines the 3-1 stereo audio mode, the in-phase J calculating means 14 and the anti-phase adding means 15 output the added audio signals, and the audio mode ÷ "determining means 13 determines the 3-1 stereo audio mode." If it is determined that the stereo audio mode is not in effect, the audio demodulating means 12 outputs all the demodulated audio signals of the first to fourth channels CHI to CH4.

According to the above configuration, when the audio mode determining means #913 determines that the received audio signal is in the 3-1 Nutero audio mode, the VC, the audio switching means 16, and the in-phase addition means 14
Since the anti-phase addition means 15 outputs all the audio signals calculated by 1, the 3-1 stereo audio can be converted into 2-channel stereo, and the 4th channel can send the surround audio.
Channel CH41, the 1st channel that sends left and right audio. Is it a surround effect because it is added to the second channel in opposite phase? You can even enjoy a 3-10,000-style 4-channel stereo as a 2-channel stereo without any damage.

Effects of the Invention As described above, according to the present invention, the third channel
and 7I with dislocation to the second channel/L-! ] By providing an in-phase addition means for adding the fourth channel to the first and second channels and an anti-phase addition means for adding the fourth channel to the first and second channels in an opposite phase, the audio mode can also be changed to a constant 3-1 stereo audio mode. When this is determined, the audio switching means outputs the audio signal 8 added by the in-phase addition means and the anti-phase addition means, so that it is possible to convert the 3-1 stereo audio signal to 2-channel stereo. Yes, the fourth channel A/, which sends surround sound, is connected to the first and second channels, which send left and right sound.
Since the channels are multiplied by 710 in opposite phase, the surround effect will not be lost, and you can enjoy the 3-1 system, 4 channel stereo, and 2 channel stereo.

[Brief explanation of the drawing]

Figure 1d is a block diagram showing the main parts of a high-definition television receiver @Iso according to an embodiment of the present invention, and Figure 2 is a 3-1 type 4
FIG. 3 is a schematic flat UkJ diagram showing the CH stereo system, and FIG. 3 is a 7Fj block diagram of the main parts of a conventional high-definition television receiver. DESCRIPTION OF SYMBOLS 11... Hozuka false code demodulation means, 12... Audio signal demodulation means, 13... Audio mode determination means, 14... In-phase addition means, 15... Anti-phase addition means, 16...・Audio switching means. Agent: Morimoto Table: Private draft 2 drawings〆

Claims (1)

[Claims] 1. Audio signal demodulation means for demodulating a PCM audio signal of MUSE system high-definition television broadcasting into first to fourth audio signals, and a third channel demodulated by the audio signal demodulation means to the first and second audio signals. an in-phase addition means for adding in the same phase to a fourth channel demodulated by the audio signal demodulation means;
anti-phase addition means for adding the channel to the first and second channels in opposite phase; audio mode determination means for determining the audio mode by inputting the audio control code detected by the audio demodulation means; and the audio demodulation means audio switching means for switching and outputting the audio signals of the first to fourth channels demodulated by the means and the audio signals added by the in-phase addition means and the anti-phase addition means; A high-definition television receiver configured to output an audio signal added by the in-phase addition means and the anti-phase addition means when the audio mode determination means determines the 3-1 stereo audio mode.