JPH0560099U - Hi-vision audio signal receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to improve the quality by effectively utilizing the audio processing circuits of channels 3 and 4 which are not used in the 2CH mode for listening to the audio outputs of channels 1 and 2. [Structure] In 2CH mode, data signal DATA1 /
2 and the control signal are input to the audio signal processing circuit 6, while the inverted signal of the data signal DATA1 / 2 and the control signal are input to the audio signal processing circuit 7, and their outputs are combined by the differential circuit 12. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-definition audio signal receiving device that receives high-definition audio broadcasting and outputs audio.

[0002]

[Prior Art]

 A block diagram of a conventional high-definition audio signal receiving circuit is shown in FIG. Here, (1) to (3) are control signal input terminals for high-definition audio signals, (4) is a data signal DATA1 / 2 input terminal including audio data of channels 1 and 2, and (5) is channel 3 and channels 4. And a data signal DATA3 / 4 input terminal including (6) is the first audio signal processing circuit of channels 1 and 2, (7) is the second audio signal processing circuit of channels 3 and 4, (60) and (70) are their respective digital processing circuits, (61), (62), (71) and (72) are D / A converters of channels 1 to 4, respectively, and (63), (64), (73) and (74) are LPFs (low pass) of channels 1 to 4, respectively.・ It is a filter). (8) is the first audio final stage amplifier circuit of channels 1 and 2, and (1ch) and (2ch) are the output terminals of channels 1 and 2. (9) is a second audio final stage amplifier circuit of channels 3 and 4, and (3ch) and (4ch) are output terminals of channels 3 and 4.

The data signal DATA1 / 2 (4) and the control signals (1) to (3) are input to the first audio processing circuit (6), passed through the first audio final stage amplifier circuit (8), and channel 1 , 2 are output. On the other hand, the data signal DATA3 / 4 (5) and the control signals (1) to (3) are input to the second audio processing circuit (7), passed through the second audio final stage amplifier circuit (9), and the channel 3, 4. The voice of 4 is output.

[0004]

However, in the 2CH mode in which the audio outputs of channels 1 and 2 are heard, the circuits of channels 3 and 4 are not used. Therefore, it is intended to effectively use the audio signal processing circuits of channels 3 and 4 in which this advanced technology not used is incorporated. Accordingly, it is an object of the present invention to provide a high-definition audio signal receiver for the purpose of reducing common-mode noise and even-order distortion, and reducing deterioration due to variations in the characteristics of audio signal processing circuit components.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a high-definition audio signal receiving apparatus of the present invention inputs a data signal DATA 1/2 including data of channels 1 and 2 of a high-definition audio signal and a control signal, and performs digital processing, D / A first audio signal processing circuit for performing A conversion and analog processing and outputting audio signals of channels 1 and 2, and a data signal DAT A3 / 4 including data of channels 3 and 4 of a high vision audio signal. , An input data switching circuit that selects one of the inverted signals of the data signal DATA1 / 2 and outputs one of them, and a digital signal by inputting the data signal and the control signal from the input data switching circuit. Processing, D / A conversion, and analog processing are performed, and the channel 3 and the channel are selected according to the data signal selected by the input data switching circuit. Second audio signal processing circuit that outputs the audio signal of channel 4 or outputs the inverted audio signal of channel 1 and channel 2, and the first audio final stage that mainly amplifies the audio signal of channel 1 and channel 2, respectively. An amplifier circuit, a differential for combining the channel 1 and channel 2 audio signals from the first audio signal processing circuit, and the inverted channel 1 and channel 2 audio signals from the second audio signal processing circuit, respectively. When the data signal DATA3 / 4 is selected in conjunction with the circuit and the input data switching circuit, the audio signal output of the second audio signal processing circuit is connected to the second audio final stage amplification circuit, When the inverted signal of the data signal DATA1 / 2 is selected, the audio signal output of the second audio signal processing circuit includes an output audio signal switching circuit connected to the differential circuit. And butterflies.

[0006]

[Action]

 According to the present invention, the following is performed in the 2CH mode in which the sounds of channels 1 and 2 are heard. The audio data signal DATA1 / 2 and the control signal are input to the first audio signal processing circuit and output to the differential circuit. On the other hand, the inverted signal of the audio data signal DATA1 / 2 and the control signal are input to the second audio signal processing circuit and output to the differential circuit. The differential circuit synthesizes the audio signals respectively. Therefore, in-phase noise is canceled from the synthesis. Further, even-order distortion due to LPF is also reduced. Furthermore, the deterioration of the characteristics of the audio data processing circuit due to the variations in the characteristics of the electronic components of the digital circuit, the D / A converter and the LPF is reduced. On the other hand, in the 4CH mode in which channels 3 and 4 are also heard, the circuit becomes the same as that shown in FIG. 2 of the conventional example. However, if the voice synthesis matrix ON / OFF circuit is turned ON in the 4CH mode, the voice of the 4-channel effect can be enjoyed even in the conventional 2-channel audio system.

[0007]

【Example】

 FIG. 1 is a block diagram of a circuit according to an embodiment of the present invention. Here, (1) to (9), (60) to (64), (70) to (74), and (1ch) to (4ch) are the same as those in FIG. (11) is an input data switching circuit, (12) is a differential circuit, (13) is an output voice signal switching circuit, and (14) is a voice synthesis matrix ON / OFF circuit. In FIG. 1, when 2CH is selected, the switches of the input data switching circuit (11) and the output audio signal switching circuit (13) are connected upward. At this time, the voice synthesis matrix ON / OFF circuit (14) may be turned off, so this switch is also connected upward. With the above connection, the audio data signal DATA1 / 2 is combined with the inverted signal by the differential circuit (12). Therefore, the in-phase noise is canceled and the even-order distortion is reduced, so that the voice signal has high quality. Moreover, variations in the characteristics of the electronic components of the audio data processing circuits (6) and (7) are also reduced by the effect of this differential circuit.

On the other hand, in FIG. 1, in the 4CH mode in which the audio switch of the input data switching circuit (11) is turned down and the audio data signal DATA3 / 4 is connected, the switch of the output audio signal switching circuit (13) is also turned down. Although the circuit is the same as the conventional one, if the switch of the voice synthesis matrix ON / OFF circuit (14) is turned down and turned on, the voice signal having the 4-channel effect is converted into the first voice final stage amplification circuit (8). ).

[0009]

[Effect of the device]

 As described above, the present invention has the following effects. Common-mode noise and even-order distortion are reduced, high-quality audio output is obtained, and the performance of the device can be improved because it reduces performance deterioration due to variations in the characteristics of electronic components of the audio processing circuit.

[Brief description of drawings]

FIG. 1 is a block diagram of a circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram of a circuit of a conventional example.

[Explanation of symbols]

 1-3 control signal input terminal 4 data signal DATA1 / 2 input terminal 5 data signal DATA3 / 4 input terminal 6,7 audio signal processing circuit 60,70 digital processing circuit 61,62,71,72 D / A converter 63, 64, 73, 74 LPF 8, 9 Audio final stage amplifier circuit 1ch to 4ch Output terminal of audio final stage amplifier circuit 11 Input data switching circuit 12 Differential circuit 13 Output audio signal switching circuit 14 Audio synthesis matrix ON / OF circuit

Claims (1)

[Scope of utility model registration request] 1. A channel 1 and channel 2 audio signal is input by inputting a data signal DATA1 / 2 including channel 1 and channel 2 data of a high-definition audio signal and a control signal, and performing digital processing, D / A conversion and analog processing. A first audio signal processing circuit for outputting a signal, a data signal DATA3 / 4 including data of channels 3 and 4 of a high-definition audio signal, and an inversion signal of the data signal DATA1 / 2 are selected, An input data switching circuit for outputting one, a data signal from the input data switching circuit and the control signal are input, digital processing, D / A conversion and analog processing are performed, and data selected by the input data switching circuit. Corresponding to the signal, output the audio signal of channel 3 and channel 4 or inverted channel 1 and channel Second audio signal processing circuit for outputting the audio signal of 1), a first audio final stage amplification circuit for mainly amplifying audio signals of channels 1 and 2 respectively, and channel 1 and channel 2 from the first audio signal processing circuit. Differential signal for synthesizing the audio signal of the second audio signal and the inverted audio signals of the channel 1 and the audio signal of the channel 2 from the second audio signal processing circuit, and the data signal D in cooperation with the input data switching circuit.
When ATA3 / 4 is selected, the audio signal output of the second audio signal processing circuit is connected to the second audio final stage amplifier circuit,
When an inversion signal of the data signal DATA1 / 2 is selected, the audio signal output of the second audio signal processing circuit comprises an output audio signal switching circuit connected to the differential circuit. Signal receiving device.