JPH0828868B2 - Audio signal receiver - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice receiving device for obtaining a voice signal from a signal transmitted from a satellite.

2. Description of the Related Art In recent years, the high-definition reception system of the muse system has become ready for reception by broadcasting using satellite broadcasting.

An example of the above-described conventional audio signal receiving apparatus will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a configuration of a conventional audio signal receiving device.

The satellite broadcast signal received by the antenna is converted into a satellite broadcast-intermediate frequency signal (hereinafter, by a converter (not shown)).
It is converted to a BS-IF signal), input to the input terminal a of the high-definition audio demodulator 1, and demodulated into a composite video signal in the BSIF demodulator (BS tuner) 2. In the muse system, since the audio signal is multiplexed in this composite video signal, this signal is processed by the digital audio demodulation device 3 into four channels of left and right (R, L), center (C) and rear (surround S). Convert to audio signal. These four
The channel audio signal is output from the terminals b, c, d, and e to the external first 4-channel amplifying device 4, amplified, and supplied to the first external speaker system 9 to form a 4-channel sound image space. ing.

On the other hand, left and right (R, L) audio signals such as Dolby Surround are supplied from terminals o and p to a multiple signal demodulator (Dolby Surround demodulator) 14, where R, L, C and S four-channel signals are supplied. The sound signal is demodulated, output from the terminals q, r, s, t to the second four-channel amplifier 15 and amplified, and the surround sound image is reproduced by the second external speaker system 16.

In FIG. 2, the first 4-channel amplifying device 4
And the second four-channel amplifying device 15 have the same structure, and are composed of four amplifying devices (amplifiers) 5, 6, and 7.8.
Further, the first external speaker system 9 and the second external speaker system 16 have the same configuration, and the front left speaker 10, the front center speaker 11, and the front right speaker 12 are arranged.
And a rear surround speaker 13.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional configuration as described above, the 3-1 system (speaker system) is used in the high-definition audio receiving device.
There is a problem that the system becomes large and complicated because it is necessary to enjoy the four-channel stereo broadcasting of and listen to a music source such as Dolby Surround by an external system.

The present invention solves the above problems, and an object of the present invention is to provide an audio signal receiving device means for enjoying external sources such as 3-1 system stereo broadcasting and Dolby Surround with a simple configuration. .

Means for Solving the Problems To solve the above problems, an audio signal receiving apparatus of the present invention demodulates an input BS-IF signal into a composite video signal, and detects left and right first audio signals from the composite video signal. The output is a BSIF demodulator and the composite video signal output from this BSIF demodulator is input, and the audio intermediate frequency signal multiplexed in the composite video signal is input to the front left and right, the front center, and the rear surround in the 4th channel. Demodulation device that demodulates into the audio signal of
The input is the third audio signal from the outside and the first audio signal in which the signals for the channels are multiplexed into the left and right two signals,
A first audio path switching device for selecting and outputting one of them, and a multiple signal conversion for converting a first or third audio signal selected by the first audio switching device as an input into a four-channel audio signal And a second audio path switching device which receives the second audio signal and the output audio signal of the multiplex signal conversion device as an input, and selects one of them to output it to the outside.

Operation With the above configuration, the input BS-IF signal is obtained by the BSIF demodulator as the composite video signal and the sound detection is performed to obtain the left and right (R, L) first audio signals, and the composite video signal is audio demodulated. The device demodulates to a left and right front (R, L), front center (C), rear surround (S) four-channel second audio signal, while the first audio signal (R, L) is demodulated.
L) and a third audio signal (R, L) from the outside obtained by multiplexing the four-channel audio signals of R, L, C, S into two signals of R, L by the first audio path switching device. One route is selected, and the selected route is converted into a four-channel audio signal of R, L, C, S by a multiple signal conversion device, and these audio signals and R, L, C, S of the audio demodulation device are selected. , And the second audio signal of the four channels is switched by the second audio path switching device and output, and a sound image space is created using this signal.

Embodiment An audio signal receiving apparatus according to an embodiment of the present invention will be described below with reference to the drawings. The same components as those in FIG. 2 of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a block diagram showing the configuration of an audio signal receiving apparatus according to an embodiment of the present invention.

The audio signal receiving device 21 of the present invention demodulates the BS-IF signal input from the terminal a into a composite video signal, detects the NTSC R, L first audio signal from the composite video signal, and outputs the detected signal. BSIF demodulator (BS tuner) 2 and audio signals multiplexed in the composite video signal in high-definition (muse system) are 4 channels of front left and right (R, L), front center (C), rear surround (S) Digital audio demodulation device 3 for demodulating the second audio signal of
A first audio path switching device 17 for selecting and outputting one of the R and L third audio signals such as Dolby Surround input from P and the R and L first audio signals output from the BS tuner 2 17
And a multiplex signal converter 14 for converting the R, L audio signals selected by the first audio path switching device 17 into four R, L, C, S audio signals, and a multiplex signal converter 14 Select one of the output audio signal and the second audio signal of the terminal b, c, d, e
And a second audio path switching device 18 for outputting to the. The multiple signal converter 14 is the first of the R and L of NTSC.
The audio signal of is also converted into a 4-channel audio signal.

Regarding the audio signal receiving device configured as described above,
The operation will be described below with reference to FIG.

First, the BS-IF signal is supplied from the terminal a of the audio signal receiving device 21, is demodulated into a composite video signal by the BSIF demodulator 2, and is detected to detect the first audio signal of R and L of NTSC. Output. In the high-definition (muse system), the audio signal is multiplexed in the composite video signal, so that this signal is converted into R, L, C, S
Demodulate to the second audio signal of the channel.

On the other hand, the R and L third audio signals such as Dolby Surround are supplied from the terminals o and p to the audio signal receiving device 21, and
One of the NTSC R and L audio signals detected by the BSIF demodulator 2 is selected by the audio path switching device 17 and is supplied to the multiplex signal conversion device 14, where R, L and C are selected. , S of four channels of audio signals are demodulated. This audio signal and the second audio signal output from the digital audio demodulation device 3 are selected by the second audio path switching device 18, and output terminals b, c, d,
From e, it is output as R, L, C, and S audio signals, amplified by the external 4-channel amplifier 4, and the speaker system 9 forms a 4-channel sound image space.

In this way, by newly providing the multiplex signal conversion device 14 and the first and second audio path switching devices 17 and 18 inside, the 3-1 system stereotoe broadcasting and the Dolby surround can be realized with a simple configuration of the same device. You can enjoy music sources such as.

EFFECTS OF THE INVENTION As described above, according to the present invention, a BS-1 demodulator and a digital audio demodulation device are added with a multiplex signal conversion device and first and second audio path switching devices, so that 3-1 system stereo broadcasting You can enjoy music sources such as and Dolby Surround with a simple configuration of the same device.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a voice signal receiving apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a conventional voice signal receiving apparatus. 21 …… High-definition audio demodulator, 2 …… BSIF demodulator (BS
Tuner), 3 ... Digital voice demodulator, 4 ... 4
Channel amplifier, 5,6,7,8 …… Amplifier inside 4-channel amplifier, 9 …… Speaker system, 10 ……
Front left speaker, 11 …… Front center speaker, 12 ……
Front right speaker, 13 ... Rear surround speaker, 14 ...
... Multiple signal converter (Dolby Surround demodulator), 17
...... First voice route switching device, 18 …… Second voice route switching device.

Claims (1)

[Claims] 1. A BSIF demodulator for demodulating an input BS-IF signal into a composite video signal, and detecting and outputting first left and right first audio signals from the composite video signal, and a composite output from this BSIF demodulator. An audio demodulator that receives a video signal as an input and demodulates the audio intermediate frequency signal multiplexed in the composite video signal into a four-channel second audio signal of front left and right, front center, and rear surround, and input from an external input terminal. A first audio path switching device for inputting a third audio signal from the outside obtained by multiplexing signals for four channels into two left and right signals and the first audio signal, and selecting and outputting one of them; A multiplex signal converter for inputting the first or third audio signal selected by the first audio path switching device into an audio signal of four channels, the second audio signal and the multiplex signal Outputs an audio signal as an input, the audio signal receiving apparatus is composed of a second audio path switching unit that outputs to the outside by selecting the one of the conversion device.