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Audio communication system

An audio communication and audio signal technology, applied in telephone communication, transmission system, wired transmission system, etc., can solve the problems of signal volume distortion, echo canceller 402 can not completely realize echo cancellation, etc., and achieve hardware size expansion, Effect of preventing increase in circuit size and cost

Inactive Publication Date: 2007-11-14
SONY CORP
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  • Claims
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AI Technical Summary

Problems solved by technology

[0010] If the source signal output from the speaker is directly DA-converted and output, it may happen that, for example, distortion occurs depending on the volume of the signal, or when the signal is a multi-channel signal such as a stereo signal, the echo canceller 402 Echo cancellation cannot be fully realized

Method used

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Embodiment Construction

[0029] Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the configuration of an audio communication system according to one embodiment of the present invention.

[0030] Auxiliary input terminal 101 (AUX) connects a sound source of high sound quality, such as a Super Audio CD or DVD audio player. A signal input from the auxiliary input terminal 101 (AUX) is sampled at a sampling frequency of, for example, 96 kHz, and converted into a digital signal by the AD converter 201 (ADC).

[0031] For example, a microphone input terminal 102 (MIC) is connected to a microphone for collecting audio. A signal input from the microphone input terminal 102 (MIC) is sampled at a sampling frequency of, for example, 96 kHz, and converted into a digital signal by the AD converter 202 (ADC).

[0032] The sampling rate converter 302 (D.S.) (downsampling) is a circuit that performs sampling rat...

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PUM

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Abstract

An audio communication system includes a first analog / digital convertor, a second analog / digital convertor, and an echo canceller. The first analog / digital convertor converts an audio signal, which is input from a microphone, to a data signal. The second analog / digital convertor that converts an audio signal, which is input from an auxiliary input terminal, to a data signal. When an audio signal transmitted from the outside is received and output from a speaker, the echo canceller prevents an output of the speaker from being input through the microphone and echoed back to a recipient or remote device. An operating frequency of the echo canceller is relatively lower than a sampling frequency of the second analog / digital convertor.

Description

[0001] Related Application Cross Reference [0002] The present invention contains subject matter of Japanese Patent Application JP2006-054331 filed in the Japan Patent Office on Mar. 1, 2006, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to an audio communication system that performs transmission and reception of audio signals (ie, communication) with high sound quality. Background technique [0004] Figure 3 shows an example of a previously proposed or existing audio communication system, such as a video conferencing or telephone unit or system (unless otherwise specifically stated or referred to, the term "audio" is used hereinafter to refer to any such "Voice" and "Voice"). An auxiliary input terminal 101 (AUX) is a terminal for connecting a sound source such as a CD (Compact Disc Read Only). A signal input from the auxiliary input terminal 101 (AUX) is sampled at, for example, a sampling frequen...

Claims

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Application Information

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IPC IPC(8): H04M9/08H04M1/60H04B3/20
CPCH04M9/082
Inventor 松井丈
Owner SONY CORP
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