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Two-way echo cancellation method

An echo cancellation and echo technology, applied in the field of signal processing, can solve the problem of not doing two-way echo cancellation, and achieve the effect of improving voice quality

Inactive Publication Date: 2016-04-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the following idea: "This is a problem with the other party's device during the call, not my device." Existing mobile communication devices do not consider this problem, so the existing devices do not implement two-way echo cancellation of

Method used

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Embodiment Construction

[0027] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0028] In the existing technology, there is no mobile communication equipment to do two-way echo cancellation. The specific reason may be: the echo heard during the call is a problem with the other party’s equipment, and has nothing to do with my own equipment. The echo heard by the other party is a problem with my own equipment. Therefore, there is no need to make devices that have nothing to do with your own mobile phone products; when a mobile communication device talks to a fixed phone (hands-free), the person using the mobile communication device will hear his own echo, but the fixed phone cannot hear it. The excuse of the mobile communication device is: "That is the problem of the other party's equipment, it has nothing to do with mine, and the other party did not hear his own echo, which reflects the advantages of our products!"

[0029...

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Abstract

The invention discloses a two-way echo cancellation method, which specifically includes: sampling the far-end signal to obtain a signal sequence X; sampling the signal to be sent at the near-end to obtain a signal sequence E; using an adaptive filtering algorithm to obtain a signal sequence E is the reference signal, and the echo cancellation is performed on the signal sequence X to obtain the signal sequence F; the obtained signal sequence F is input to the echo cancellation circuit of the mobile communication device hardware to obtain the output signal sent to the remote end. The method of the present invention realizes the echo cancellation of the far-end signal by adding an adaptive filtering algorithm on the mobile communication device, and at the same time adds the echo cancellation function of the mobile communication device hardware itself to the near-end signal, and realizes the method without adding additional hardware. On the basis of using a single device, the purpose of simultaneous echo cancellation for two-way signals is achieved, and the voice quality of the call is improved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a two-way echo cancellation method. Background technique [0002] On smart phone devices, the echo cancellation technology is very mature. However, these devices perform echo cancellation for the far-end signal, but do not perform echo cancellation for the near-end device. When making a call between two smart devices that both have echo cancellation features, neither party will be bothered by the echo. However, when a smart device with echo cancellation features talks to a device without echo cancellation, the smart device with echo cancellation features will be troubled by the echo instead. For example, when a mobile communication device (mobile phone) communicates with a landline phone that has no echo cancellation function and has turned on the loudspeaker mode, the caller holding the mobile communication device will hear his own echo from the far end. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
Inventor 丁莉凌丹郝晓红周吴曾志张遒姝彭倍
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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