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Signal processor and method for canceling echo in a communication device

A technology of signal processor and communication device, which is applied in interconnection device, telephone communication, side tone canceling circuit, etc. It can solve the problems that the remote user cannot hear the near-end user and the quality of the near-end signal Sn8 is degraded.

Inactive Publication Date: 2009-01-14
FORTEMEDIA
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This will make the remote user unable to hear the voice of the near-end user, and make the near-end signal S n8 The quality of

Method used

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  • Signal processor and method for canceling echo in a communication device
  • Signal processor and method for canceling echo in a communication device
  • Signal processor and method for canceling echo in a communication device

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Embodiment Construction

[0049] FIG. 2 is a block diagram of a communication device 200 including a signal processor 250 for canceling echo according to the present invention. The communication device 200 is roughly similar to the communication device 100 of FIG. 1 , except that the signal processor 250 further includes a voice activity detector 205 and a speaker attenuation module 206 . Because it is difficult for the nonlinear echo processor 204 of the signal processor 250 to distinguish the nonlinear echo from the voice of the near-end user, a voice activity detector 205 is added in the signal processor 250 to assist the nonlinear echo processor 204 in distinguishing the nonlinear echo. echo. Voice activity detector 201 first detects whether the remote signal S f2 The power exceeds the limit value to generate a control signal A 1 . Therefore, the control signal A 1 Indicates whether the remote user is speaking. Voice activity detector 205 then generates control signal A 2 with A 3 Indicates ...

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Abstract

The invention provides a signal processor installed in a communication device. In one embodiment, the signal processor comprises a voice activity detector, a nonlinear echo processor, and a speaker attenuation module. The voice activity detector generates a control signal indicating whether both a far-end talker at a far end and a near-end talker at a near end are speaking or only the far-end talker is speaking. The nonlinear echo processor, controlled by the control signal, cancels more nonlinear echo from the near-end signal in time domain while only the far-end talker is speaking and cancels less nonlinear echo from the near-end signal in time domain while both the far-end talker and the near-end talker are speaking. The speaker attenuation module, controlled by the control signal, attenuates the far-end signal while both the far-end talker and the near-end talker are speaking.

Description

technical field [0001] The present invention relates to echo cancellation, and more particularly to nonlinear echo cancellation for full duplex communication devices. Background technique [0002] A full-duplex communication device is currently commonly used for a near-end user to communicate with a remote user, such as a speakerphone or a conference system. The efficiency of echo cancellation greatly affects the performance of full-duplex communication devices. The full-duplex communication device receives the remote signal from the remote user through the communication link, and plays the remote signal at the near end through a loudspeaker or loudspeaker. At the same time, the microphone of the full-duplex communication device also picks up the voice of the near-end user to generate a near-end signal, and sends the near-end signal to the remote through the communication link. When the speaker of the full-duplex communication device plays the remote signal, part of the so...

Claims

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Application Information

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IPC IPC(8): H04M1/58H04M1/60H04M1/19
CPCH04M9/082
Inventor 赖贤能刘从周
Owner FORTEMEDIA
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