JPH0366237A - Audio reproducing device - Google Patents

Abstract

PURPOSE:To always obtain normal operation independently of the kind of an audio signal sent from a High Vision receiver by controlling the operating state of an audio mode changeover means in a High vision audio signal amplifier automatically in response to the kind of an audio signal sent from the High Vision audio signal amplifier. CONSTITUTION:In the case of an audio signal 2 sent from a High Vision receiver 1 to be an audio signal outputted from a MUSE decoder in the High Vision receiver 1, an audio mode changeover means 4 is in the operating state by an instruction of a control signal 14, the audio signal 2 is processed by the audio mode changeover means 4 and outputted as an audio signal 5. When the audio signal 2 sent from the High vision receiver 1 is an audio signal outputted from the audio mode changeover means 4 in the High Vision receiver 1, the audio mode changeover means 4 is in the stop state by an instruction of the control signal 14, and the audio signal 2 is outputted as the audio signal 5 while not being processed by the audio mode changeover means 4. As a result, the processing of the audio signal in duplicate is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a method for reproducing high-definition audio signals.
The present invention relates to an audio playback device.

(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 front channels, one rear channel) 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 in order to provide good viewing with less discrepancy between the video and the sound image over a wide range, 3 channels are placed in front, and in order 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 broadcasting system, the current television broadcasting 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 the main audio, L is the left channel audio, R is the right channel audio, C is the center channel audio, S is the surround channel audio, and L is the surround channel audio.

indicates front left channel audio, RF indicates front right channel audio, L indicates rear left channel audio, and RBp indicates rear right channel audio. Although other audio systems not included in this catalog may be considered, we will consider the four audio systems shown in FIG. 4 here.

Furthermore, FIG. 3 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)
), speaker 1 (SPI), speaker 2
(SF3) is connected for playback.

Stereo audio signals are transmitted on 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 (CHI), R for audio channel 2 (CH2), and C for audio channel 3 (CH3).
1 audio channel 4 (CH4) with S, speaker 1 (SPI) - R, speaker 2 (SF3) - R,
, 2, Speaker 3 (SF3) C, Speaker 4 (SF
3)-3, Speaker 5 (SF3) Connected for optimal reproduction at -3.

The 2-2 system 4-channel audio signal is audio channel 1 (
LF to (, Hl), RF to audio channel 2 (CH2)
, Lll is transmitted to audio channel 3 (CH3), R8 is transmitted to audio channel 4 (CH4), and speaker 1 (S
PI) LF, Speaker 2 (SF3) RF
'+Speaker 4 (SF3) Lll, Speaker 5
(SF3)-R@ is connected for optimal reproduction.

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. 2 is a block diagram of an audio reproducing device for a high-definition receiver that reproduces high-definition audio signals according to the prior invention of the present inventors. In the figure, 1 is a high-definition receiver that receives a 4-channel high-definition audio PCM signal, 2 is an audio signal sent from this high-definition receiver 1, and 3 is an amplifier that supports the high-definition audio signal. 5 is an audio signal processed by this audio mode switching means 4; 6 is a volume circuit that attenuates the processed audio signal 5; 7 is attenuated by this volume circuit 6. This is an amplifier circuit that amplifies the power of the audio signal. Further, 8 to 12 are speakers driven by this amplifier circuit 7, 8 is a right channel speaker, 9 is a center channel speaker, 10 is a left channel speaker,
11 is a rear right channel speaker, and 12 is a rear left channel speaker. Further, 13 is a viewer.

Next, the operation will be explained.

One of the audio signal output from the MUSE decoder in the high-visibility receiver 1 and the audio signal output from the audio mode switching means in the high-definition receiver 1 is selected,
The high-definition receiver 1 sends out the audio signal 2. The audio mode switching means 4 of the high-definition audio signal compatible amplifier 3 has a function of selecting which channel of the audio signal 2 is assigned to a plurality of speakers placed at predetermined positions, and the audio signal 2 is set to this audio mode. After being processed by the switching means 4, it is output as an audio signal 5. The processed audio signal 5 is attenuated by a volume circuit 6, then power amplified by an amplifier circuit 7, and then sent to a right channel speaker 8.
Center channel speaker9. Left channel speaker 10. Rear right channel speaker 11. Each is converted into audio by the rear left channel speaker 12, and the viewer 1
Perceived by 3.

[Problem to be solved by the invention]

The audio playback device according to the prior invention of the present inventors is configured as described above, and the audio mode switching means in the high-definition receiver 1 functions similarly to the audio mode switching means 4 in the high-definition audio signal compatible amplifier 3. Therefore, if the audio signal 2 sent from the high-definition receiver 1 is a signal processed by the audio mode switching means in the high-definition receiver 1, there is a risk that the audio signal will be processed twice. In order to prevent this, it was necessary to manually stop the audio mode switching means 4 in the high-definition audio signal compatible amplifier 3.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an audio reproduction device that can automatically prevent double processing of audio signals.

[Means for Solving the Problems] An audio reproduction device according to the present invention is an audio reproduction device that reproduces a high-definition audio signal.
A high-definition receiver having a function of selecting and outputting one of an audio signal output from a MUSE decoder in the high-definition receiver that receives a channel PCM signal and an audio signal output from an audio mode switching means in the high-definition receiver; , an audio mode switching means that selects which channel of the high-definition audio signal from the high-definition receiver is assigned to a plurality of speakers arranged at predetermined positions, and whose operating state is controlled by a control signal from the high-definition receiver; It is equipped with a built-in amplifier that supports high-definition audio signals.

[Effect]

In the audio reproduction device of the present invention, double processing of the audio signal is automatically prevented by controlling the operating state of the audio mode switching means in the amplifier compatible with the high-definition audio signal using a control signal from the high-definition receiver. to prevent.

〔Example〕

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

FIG. 1 shows an audio reproduction device according to an embodiment of the present invention,
In the figure, 14 is sent from the high-definition receiver 1,
This is a control signal that controls the operating state of the audio mode switching means 4 in the high-definition audio signal compatible amplifier 3. The other parts are the same as those of the conventional example, so the explanation will be omitted.

Next, the operation will be explained.

If the audio signal 2 sent out from the high-definition receiver 1 is an audio signal output from the MUSE decoder in the high-definition receiver 1, the audio mode switching means 4 is activated by the command of the control signal 14, and the audio signal 2 is processed by this audio mode switching means 4 and then output as an audio signal 5. If the audio signal 2 sent from the high-definition receiver 1 is an audio signal output from the audio mode switching means in the high-definition receiver 1, the audio mode switching means 4 is stopped in operation by the command of the control signal 14. , the audio signal 2 is not subjected to any processing by the audio mode switching means 4 and is output as an audio signal 5. As a result, it is possible to prevent the audio signal from being processed twice.

〔Effect of the invention〕

As described above, according to the audio playback device according to the present invention,
Since the configuration is configured to automatically control the operating state of the audio mode switching means in the amplifier compatible with high-definition audio signals according to the type of audio signals sent out from the high-definition receiver, Regardless of the type, it has the effect of always providing normal operation.

[Brief explanation of drawings]

0 FIG. 1 is a block diagram showing an audio reproducing device for reproducing high-definition audio signals according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an audio reproducing device for reproducing high-definition audio signals according to the prior invention of the present inventors. FIG. 3 is a layout diagram of five speakers, and FIG. 4 is a diagram showing types of audio systems. In the figure, 1 is a high-definition receiver, 3 is an amplifier compatible with high-definition audio signals, 4 is audio mode switching means, and 14
is a control signal. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In an audio reproduction device that reproduces a high-definition audio signal, an audio signal output from a MUSE decoder in a high-definition receiver that receives a 4-channel high-definition audio PCM signal and an audio signal output from an audio mode switching means in the high-definition receiver A high-definition receiver that has a function of selecting and outputting one of the high-definition audio signals, and a high-definition receiver that selects which channel of the high-definition audio signal from the high-definition receiver is to be assigned to multiple speakers placed at predetermined positions. 1. An audio playback device comprising: an amplifier compatible with high-definition audio signals and having built-in audio mode switching means whose operating state is controlled by a control signal from the device.