JPH0583798A - Voice selector - Google Patents

Abstract

PURPOSE:To simultaneously hear both voices even when both television voice and independent voice are selected. CONSTITUTION:The selector is equipped with input terminals 101, 102 and 103, 104 to input a television voice and an independent voice having respective 2 channels, converting circuits 105, 106 to convert respective channel signals of the television voice and the independent voice to a television monoral voice signal and an independent monoral voice signal respectively, and selecting circuits 107 and 108 to select respective channel signals inputted to input terminals 101, 102 or input terminals 103, 104 and derive them to output terminals 110 and 111 when either of the television voice or the independent voice is heard, and select the television monoral voice signal and the independent monoral voice signal and derive them to the output terminals 110, 111 when the television voice and the independent voice are simultaneously heard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital sound for satellite broadcasting, and more particularly to a sound selecting device for selecting a plurality of sound signals for high-definition television broadcasting.

[0002]

2. Description of the Related Art Present television broadcasting is currently being carried out using a broadcasting satellite BS2b. Of these, the audio signal is transmitted as a digital signal of the QPSK (four-phase phase modulation method) subcarrier method. In addition, high-definition television broadcasting, which is expected to be put to practical use, is
uist Sampling Encoding) is used for band compression and transmitted using broadcasting satellites. Of these, the audio signal is transmitted as a baseband multiplexing digital signal. Since the two audio signals basically have the same audio transmission mode and have a lot of common parts, their standards are being examined by a committee such as the Japan Electronic Machinery Manufacturers Association. FIG. 2 shows an audio transmission mode related to the current satellite broadcasting. Further, FIG. 3 shows a voice transmission mode related to the MUSE system.

The audio transmission modes in the above two satellite broadcasts include an A mode in which the audio signal band and the transmission channel are 15 kHz, 4 channels, and 20 kHz, respectively.
There is a 2-channel B mode. Further, within each mode there are several transmission formats.

The MUSE audio transmission format includes double stereo audio and 3-1 system 4 which are not available in the current satellite broadcasting.
Channel stereo audio is used. Therefore, the control bit b6, which is applied to the de-emphasis information in the current satellite broadcasting, is applied to the 4-channel information in the MUSE method. The double stereo sound is a stereo version of the conventional double monaural sound. And
The parts corresponding to the main monaural and the sub monaural of the dual monaural audio are the main stereo and the sub stereo, respectively. In addition, the 3-1 system 4-channel stereo sound is
It is composed of three front channels and one rear channel in the left, right, and center. These channels are transmitted as four independent channels. Hereinafter, an audio selection device installed in a normal television receiver, that is, a receiver having two channels of audio output will be described.

FIG. 4 shows a voice selection device for dual monaural voice. A main monaural audio signal of dual monaural audio is input to the input terminal 201. The main monaural audio signal is input to each a terminal of the selection circuits 203 and 204. The sub-monaural audio signal of dual monaural audio is input to the input terminal 202. The sub monaural audio signal is input to the b terminals of the selection circuits 203 and 204.

The selection circuit 203 selects either the a or b terminal based on the control signal input to the control terminal 205. The selected audio signal is led to the output terminal 207 as a left channel audio signal via the c terminal. Similarly, the selection circuit 204 selects either the a terminal or the b terminal based on the control signal input to the control terminal 206. The selected audio signal is output to the output terminal 208 as a right channel audio signal via the c terminal.

The operation will be described below. First, when the main monaural sound is selected, the selection circuits 203 and 204
Selects the main monaural audio signal which is input to the terminal a and outputs it to the output terminals 207 and 208. Next, when the sub-monaural sound is selected, the selection circuits 203 and 204
Selects the sub-monaural audio signal that is input to the b terminal and outputs it to the output terminals 207 and 208. Further, when the main / sub monaural sound is selected, the selection circuit 203 outputs a
The main monaural audio signal input to the terminal is selected, and the selection circuit 204 selects the sub-monaural audio signal input to the b terminal and outputs it to the output terminals 207 and 208.

As described above, in the conventional dual monaural voice, the main voice and the sub voice are both monaural voices. Therefore, when either the main monaural sound or the sub monaural sound is selected, the selected sound can be heard. Further, when the main / sub audio is selected, the main monaural audio and the sub monaural audio can be heard at the same time.

FIG. 5 shows a voice selection device for TV / independent voice. Television sound is the stereo 1 defined by the control bits b2 and b3 shown in FIG.
It is a system, one monaural system, two monaural systems, and any undefined voice. Here, the independent voice exists only in the case of A mode and two channels.

The left channel signal of the television sound is input to the input terminal 301, and the right channel signal of the television sound is input to the input terminal 302. The left channel signal and the right channel signal are selected by the selection circuits 305 and 305, respectively.
It is input to each a terminal of 306. In addition, the input terminal 303
Is input to the left channel signal of the independent audio, and the right channel signal of the independent audio is input to the input terminal 304. The left channel signal and the right channel signal are input to the b terminals of the selection circuits 305 and 306, respectively.

The selection circuits 305 and 306 select one of the terminals a and b based on the control signal input to the control terminal 307, respectively. The selected channel is led to the output terminals 308 and 309 as a left channel and a right channel via the c terminal, respectively.

The operation will be described below. First, when the television sound is selected, the selection circuits 305 and 306 select the left channel signal and the right channel signal input to the a terminal, respectively, and lead them to the output terminals 308 and 309. Next, when the independent voice is selected, the selection circuit 30
Reference numerals 5 and 306 select the left channel signal and the right channel signal respectively input to the b terminal, and output terminals 308 and
309. Each of the television sound and the independent sound is composed of two channels of sound. Therefore, unlike the above-mentioned dual monaural voice, it cannot be selected at the same time.

As described above, when the independent audio is present, the television audio is transmitted through the transmission channels 1 and 2, and the independent audio is transmitted through the transmission channels 3 and 4. Therefore, when either TV sound or independent sound is selected, the selected sound can be heard, but even if both TV sound and independent sound are selected, both sounds cannot be heard at the same time. Can not. This is because both the TV sound and the independent sound occupy two channels. However, similarly to the case of the dual monaural sound, the listener has a desire to select both the TV sound and the independent sound and listen to them at the same time.

[0014]

As described above, in the conventional audio selection device, independent audio exists, and even if both TV audio and independent audio are selected, both audios cannot be heard at the same time. was there.

Therefore, the present invention has been made in order to solve the above problems, and provides a voice selection device capable of listening to both voices at the same time even when both television voices and independent voices are selected. With the goal.

[0016]

A voice selection device according to the present invention comprises first and second input means for inputting television voice and independent voice each having two channels.
When listening to either the TV sound or the independent sound, the first and second conversion means for converting the TV sound and the independent sound into TV monaural sound and independent monaural sound, respectively, and the first or second conversion means. When selecting and deriving each channel input to the input means and simultaneously listening to the TV sound and the independent sound, there is provided a selecting means for selectively deriving the TV monaural sound and the independent monaural sound.

[0017]

In the above means, the TV sound and the independent sound each having two channels are converted into the TV monaural sound and the independent monaural sound. Therefore, even when both the TV sound and the independent sound are selected, the TV sound and the independent sound can be simultaneously heard by selecting the monaural sound and outputting the sound of two channels.

[0018]

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

FIG. 1 shows a voice selection device according to the present invention. A left channel signal of television sound is input to the input terminal 101, and a right channel signal of television sound is input to the input terminal 102. The left channel signal and the right channel signal of the TV sound are converted into the conversion circuit 1 respectively.
It is input to the a and b terminals of 05 and the a terminals of the selection circuits 107 and 108.

The input terminal 103 is supplied with an independent audio left channel signal, and the input terminal 104 is supplied with an independent audio right channel signal. The left channel signal and the right channel signal of the independent audio are input to the a and b terminals of the conversion circuit 106 and the b terminals of the selection circuits 107 and 208, respectively.

The conversion circuit 105 adds the left channel signal and the right channel signal of the television sound input to the terminals a and b to halve them to convert them into a television monaural audio signal. TV monaural audio is selected by the selection circuit 1 via the c terminal.
It is input to the terminal c of 07.

The conversion circuit 106 adds the left channel signal and the right channel signal of the independent audio input to the terminals a and b to halve them to convert them into an independent monaural audio signal.
The independent monaural audio signal is supplied to the selection circuit 10 via the c terminal.
8 is input to the c terminal.

The selection circuits 105 and 106 select one of the terminals a, b and c based on the control signal input to the control terminal 109. Then, the selected output is led to the output terminals 110 and 111 as a left channel audio signal and a right channel audio signal through the respective d terminals.

The operation will be described below. First, when television sound is selected, the selection circuits 107 and 108
The left channel signal and the right channel signal input to the a terminal are selected and led to the output terminals 110 and 111. Next, when the independent voice is selected, the selection circuits 107 and 10
8 is the left channel signal input to the b terminal,
The right channel signal is selected and led to the output terminals 110 and 111.

Further, when the TV / independent audio is selected, the selection circuits 107 and 108 select the TV monaural audio signal and the independent monaural audio signal input to the c terminal and lead them to the output terminals 110 and 111. That is, TV audio and independent audio are output to the output terminals 110 and 111 by the conversion circuits 105 and 106, respectively.
It is converted into an independent monaural voice and derived.

As described above, when the independent sound is present, and when either the television sound or the independent sound is selected, the selected sound can be heard. Furthermore, since TV sound and independent sound are converted to monaural sound respectively, if TV / independent sound is selected, select TV monaural sound or independent monaural sound to listen to TV sound and independent sound at the same time. be able to.

[0027]

In the voice selection device described above, when the independent voice exists, the television voice and the independent voice are each converted into monaural voice. Therefore, even when both the TV sound and the independent sound are selected, the TV sound and the independent sound can be converted into monaural sound and listened at the same time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a voice selection device according to the present invention.

FIG. 2 is a diagram showing an audio transmission mode related to current satellite broadcasting.

FIG. 3 is a diagram showing a voice transmission mode according to the MUSE method.

FIG. 4 is a configuration diagram showing a voice selection device compatible with dual monaural voice.

FIG. 5 is a configuration diagram showing a conventional audio selection device compatible with television / independent audio.

[Explanation of symbols]

101 to 104 ... Input terminals, 107, 108 ... Selection circuits, 109 ... Control terminals, 110, 111 ... Output terminals, 1
05, 106 ... Conversion circuit.

Claims (1)

[Claims] 1. A first and second input means for inputting a television sound and an independent sound each having two channels, and a first input device for converting the television sound and the independent sound into a television monaural sound and an independent monaural sound, respectively. And the second conversion means, and when listening to either the TV sound or the independent sound, each channel input to the first or second input means is selectively derived to obtain the TV sound and the independent sound. A voice selection device comprising: a selection unit for selectively deriving the TV monaural sound and the independent monaural sound when listening to the sound at the same time.