JPH0366234A - Audio output device for high vision receiver - Google Patents

Abstract

PURPOSE:To obtain a High Vision receiver with excellent operability by devising the output device such that a raw PCM 4-channel audio signal at an audio output terminal of a High Vision receiver and an audio signal supplied optimizingly to a speaker in response to the audio system are selectively outputted. CONSTITUTION:A PCM 4-channel audio signal obtained from a MUSE decoder passes through an audio selector 117 and selected so as to be connected to an optimum speaker, power amplified at a power amplifier 123 and outputted from audio output terminals 118-122. When an external device is connected to an audio control signal output terminal 130, a 2nd audio selector 132 is selected and a raw PCM 4-channel audio signal not through the audio selector 117 is outputted to audio output terminals 133-136. The signal is selected by the audio selector 143 so as to be connected to an optimum speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio output device for a high-definition receiver, and particularly relates to an improvement in the connection between an audio channel and a reproduction system (speaker).

[Conventional technology]

In high definition, compared to NTSC television,
By doubling the number of scanning lines, widening the screen, and increasing the number of pixels by five times, it is possible to obtain a high visual sense of realism that comes from a high-definition, large-screen display. On the other hand, four channels are secured as transmission paths so that a high sense of presence can be obtained from audio as well, and stereo broadcasting such as the 3-1 system (three channels in the front and one channel in the rear) is being considered. In this 3-1 system, 4-channel stereo broadcasting takes into account the case where multiple people are viewing the broadcast, and the 3 channels are placed in the front so that the viewer can enjoy good viewing with less discrepancy between the video and the sound image over a wide area, and to obtain a sense of spaciousness. One independent channel is provided at the rear of each. In high-definition broadcasting, there are 4 audio transmission channels, so 3-1
In addition to the 4-channel stereo broadcast system, the current television broadcast audio system is monaural, audio multiplexed (2
heavy), stereo broadcasting, other 3-channel broadcasting, and 3-channel broadcasting.
4-channel stereo other than 1 system (22 systems: front 2
channel, two rear channels), etc. can also be realized.

FIG. 4 shows an example of the relationship between audio systems and audio channels.

Here, main is main audio, L is left channel audio, R is right channel audio, C is center channel audio, S is surround channel audio, LF is front left channel audio,
RF indicates front right channel audio, Lm indicates rear left channel audio, and Rm indicates rear right channel audio. Other audio methods other than those shown in this diagram are also possible, but here we will use 4 in Figure 4.
Consider two audio methods.

Furthermore, FIG. 2 shows a viewing arrangement for high-definition audio using five speakers. In the figure, 101 is a high-definition display, 102 is a front left channel speaker, 104 is a center channel speaker, 103 is a front right channel speaker, 105 is a rear left channel speaker, 10
6 is a rear right channel speaker. In the case of the 5-speaker system, all of the audio systems shown in FIG. 4 can be optimally viewed without changing the speaker arrangement by appropriately switching which audio channel is output from which speaker.

For example, a monaural audio signal is audio channel 1 (CHI)
It is transmitted through speaker 1 (SPI), speaker 2 (
SF3) is connected for playback.

Stereo audio signals are transmitted through audio channel 1 (CHI) and audio channel 2 (CH2), and are connected to be reproduced by speaker 1 (SPI) and speaker 2 (SF3), respectively. 3-1 system 4-channel audio signal is L for audio channel 1 (cHL), R1 for audio channel 2 (CH2), and R1 for audio channel 3 (CH3).
) to C1 audio channel 4 (CH4) with S, speaker 1 (SPI)-L, speaker 2 (SF3
)-R, speaker 3 (SF3)C, speaker 4
(SF3)-3 and speaker 5 (SF3)-3 are connected for optimal reproduction.

2-2 system 4 channel audio signal is audio channel 1
LF to (CHI), R to audio channel 2 (CH2)
F, H8 is transmitted to audio channel 3 (CH3), R, is transmitted to audio channel 4 (CH4), and speaker 1 (S
PI) LF, Speaker 2 (SF3)-R, Speaker 4 (SF3)-LH, Speaker 5 (SF3)
Connected for optimal playback on the Ri.

In addition, the audio system identification shown in Figure 4 is based on the MUSE system, which is a transmission protocol for high-definition receivers, and the audio control signal is specified by the MUSE system, which is the transmission protocol for high-definition receivers.This audio control signal allows automatic and optimal speaker connection. . FIG. 3 shows the configuration of a high-definition receiver equipped with an audio selector for connecting an audio channel to such a speaker, according to a prior invention by the present inventors.

In Figure 3, 111 is a radio wave (12
112 is a tuner that selects a necessary channel from the signal sent from the parabolic antenna 111 and outputs a MUSE baseband signal.

Here, MUSE means Multiple 5ub-ny
Quist Sampling Encoding is a band compression technology that allows a single channel of satellite broadcasting to transmit more than five times as much high-definition information as NTSC broadcasting. The information on the four PCM audio channels is also compressed and time-base multiplexed between the vertical retrace sections of the video signal. 113 is a MUSE signal input terminal, 114 is a high-definition receiver, 115 is a high-definition display,
116 is the MU, SE signal as the original No\Ivision video, P
A MUSE decoder decodes CM audio into 4 channels, 117 is an audio selector that connects the audio channels to the aforementioned speakers, 118 to 122 are RloC, LF
, LR, and RB speakers, and 123 is a 5-channel power amplifier.

Next, the operation will be explained.

The radio waves received from the satellite by the parabolic antenna 111 are converted into MUSE baseband signals by the tuner 112,
Through the USE signal input terminal 113, the MUSE decoder 116 obtains high-definition video, four PCM audio channels, and an audio control signal. The high-definition video signal is sent to a high-definition display 115. on the other hand,
The four PCM audio channels and the audio control signal are connected to the audio selector 117 so that the audio channel is optimally connected to the speaker for each audio system, power is amplified by the 5-channel power amplifier 123, and the audio output terminals 118 to 1 are connected to the audio output terminals 118 to 1.
22 to the speakers 102-106.

[Problem to be solved by the invention]

As mentioned above, in the configuration of the above-mentioned high-definition receiver,
Optimum connection of audio channels to speakers for each audio system is now possible, but only in monaural.

In a case where there are few transmission channels such as stereo broadcasting, if you try to improve the sound effect in a pseudo manner using an external surround processor or the like from the transmitted audio channel, there is no output signal of the main audio channel of the 4 PCM audio channels. In addition, (1) it is not possible to obtain an audio control signal from the outside for determining the transmitted audio system;

There were other problems.

This invention was made to solve the above-mentioned problems, and when a stereo broadcast is sent, it is possible to obtain a realistic sound from all speakers, and also achieves 3-1.
An object of the present invention is to provide an audio output device for a high-definition receiver, in which a 4-channel PCM signal is automatically connected to an optimal speaker when a 4-channel PCM signal is sent.

[Means to solve the problem]

The audio output device for a high-definition receiver according to the present invention includes:
Equipped with an audio output terminal that switches and outputs the output signal of the audio selector and the audio output signal of the MUSE decoder, and an output terminal that transmits the audio control signal to an external device. A detection means is provided to determine whether or not it is connected to an external device, and when it is connected to an external device, the audio output terminal switches from the output signal of the audio selector and outputs the 4 channels of audio output signals from the MUSE decoder. It is designed to be output.

[Effect]

In this invention, by connecting an external audio amplifier that has a built-in surround processor, etc., and also has a function of automatically connecting audio channels to speakers using the audio method, the surround processor automatically starts when a stereo broadcast is sent. This function allows realistic sound to be obtained from all speakers, and when 3-1 system sound is sent, the 4-channel PCM signal is automatically connected to the optimal speaker without passing it through the processor. In this way, even though the audio output terminals are the same connection terminal, depending on whether or not the audio control signal output terminal is connected to an external device, the signal can be switched depending on the audio system. , it is possible to automatically select whether to output a raw audio signal without any switching.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an audio output device for a high-definition receiver according to an embodiment of the present invention. In the figure, 130 is an output terminal for an audio control signal, and 131 is an output terminal 1 for an audio control signal.
30 is an external device (here, high-definition dedicated amplifier 1)
38) is connected or not; 132 is a second audio selector that is switched by the detection signal of the connection detector 131; 133 to 137 are audio signals selected by the audio selector 132; The audio signal output terminal to be output, 138 is a 5-channel high-definition audio amplifier, 139 to 142 are audio input terminals of the high-definition audio amplifier 138, and 143 is the same as the audio selector 117, which connects the audio channel to the speaker optimally depending on the audio method. It is also equipped with an interface 0 to the surround processor 145, so that when the number of audio channels is small, such as stereo audio, sound effects simulated by the surround processor are output from other speakers. 145 is a surround processor that creates a pseudo 4-channel or 5-channel surround signal from monaural, stereo, and 3-channel stereo audio, 146 is a 5-channel power amplifier, 147 to 151 are Rr , C, LF , Lm ,
R11 is an audio output terminal for each speaker.

Next, the operation will be explained.

High-definition video signal and PC with MUSE decoder 116
The procedure is the same as in the first diagram until the four M audio channels and the audio control signal are obtained. The PCM audio 4-channel signal obtained from the MUSE decoder passes through the audio selector 117 and is switched to be connected to the optimal speaker.
The power is amplified through the power amplifier 123 and output from the audio output terminals 118 to 122.If the audio control signal output terminal 130 is not connected to an external device, the output signal of the audio selector 117 is output from the audio output terminals 118 to 122. 2 is selected by the audio selector 132, and the audio output terminals 133 to 137
It is output from In this case, audio reproduction can be performed by connecting an external power amplifier or the like for five channels. On the other hand, when an external device is connected to the audio control signal output terminal 130, the second audio selector 132 is switched, and the audio selector 117 is connected to the audio output terminals 133-136.
A raw PCM audio 4-channel signal that does not pass through is output. This PCM audio 4-channel signal is sent to the audio input terminals 139 to 142 of the high-definition audio amplifier 138.
, and the audio selector 143 switches to connect to the most suitable speaker. An audio control signal is input from the input terminal 144 and controls the audio selector. Further, the surround processor 145 is connected to the audio selector 143, and functions to always reproduce realistic sound regardless of the audio system. The output of the audio selector 143 is power amplified by a power amplifier 146 and connected to the speakers 102-106 via audio output terminals 147-151.

In the above embodiment, the switching signal for the second audio selector 132 was created by detecting whether or not an external device was connected to the audio control signal output terminal. By performing manual switching, it is also possible to achieve the effect that an external high-definition audio amplifier or the like can be connected.

Alternatively, the changeover switch may be attached to the high-definition audio amplifier 138 and a dedicated control line may be connected to the high-definition receiver 114, producing the same effect as described above.

〔Effect of the invention〕

As described above, according to the audio output device for a high-definition receiver according to the present invention, raw PCM 4-channel audio signals are output to the audio output terminal of the high-definition receiver, and audio is optimally connected to the speakers according to the audio system. Since the signal can be switched and outputted, and the audio control signal can also be transmitted externally, it is possible to connect a dedicated high-definition audio amplifier, etc. to the same audio output terminal.
This has the effect of providing a high-definition receiver that is easy to operate.

[Brief explanation of drawings]

FIG. 1 is an audio signal system diagram when a high-definition receiver and a high-definition audio amplifier according to an embodiment of the present invention are connected, FIG. 2 is a layout diagram of five speakers, and FIG.
The figure is the audio signal system diagram of the integrated high-definition receiver, part 4.
The figure is a diagram showing types of audio systems. In the figure, 114 is a high-definition receiver, 116 is an M
USE decoder, 117 is an audio selector based on the audio system, 132 is a second audio selector, 130 is an audio control signal output terminal, 131 is a connection detection means for detecting whether or not an external device is connected, 133 to 137 are The audio signal output terminal (audio output means) 143 is an audio selector. Note that the same reference numerals in the figures indicate the same or equivalent parts. 3 Engineering 4

Claims (1)

[Claims] (1) In the audio output device of a high-definition receiver that decodes the MUSE signal and reproduces the four PCM audio channels and the audio control signal, which of the four PCM audio channels is sent to multiple speakers placed at predetermined positions? audio signal selection means for selecting whether to allocate or not; audio output means for switching and outputting the PCM audio 4-channel signal and the output signal of the audio signal selection means; and detecting whether or not the PCM audio 4-channel signal is connected to an external device. and means for outputting an audio control signal, the audio outputting means replacing the output signal of the audio signal selection means when the audio control signal outputting means is connected to an external device. 1. An audio output device for a high-definition receiver, characterized in that it outputs a PCM audio 4-channel signal.