The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2017
Filed:
Dec. 15, 2015
Spreadtrum Communications (Shanghai) Co., Ltd., Zhangjiang, Shanghai, CN;
Sheng Wu, Shanghai, CN;
Bin Jiang, Shanghai, CN;
Fuhuei Lin, Shanghai, CN;
Jingming Xu, Shanghai, CN;
Ye Yuan, Shanghai, CN;
Yaqin Yong, Shanghai, CN;
Wei Ji, Shanghai, CN;
SPREADTRUM COMMUNICATIONS (SHANGHAI) CO., LTD., Zhangjiang, Shanghai, CN;
Abstract
Method and apparatus for reducing distortion echo are provided. K-path amplification and pre-distortion process are performed to the downlink reference signal to obtain K-path pre-distorted signals. Afterwards, filtering is performed using the self-adaptive filters which correspond to the downlink reference signal x(t) and the K-path pre-distorted signals to obtain the filtering signals. Error signals are obtained by calculating differences between the target signal and each of the filtering signals. The minimum-value fusion process is performed to the error signals to obtain the residual signal which is then output as the final self-adaptive echo cancellation. In embodiments of the present disclosure, the residual signal is relatively small as the minimum-value fusion process is performed to the error signals. That is to say, echo loss is relatively great. Therefore, the method may provide echo loss with high amplitude under a situation that a speaker has relatively serious distortion.