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:
Oct. 26, 2004
Filed:
Jul. 07, 2000
Song-Nien Tang, Kaoshiung, TW;
Ching-Kae Tzou, Hsinchu Hsien, TW;
Silicon Integrated Systems Corporation, Hsinchu, TW;
Abstract
Architecture of an efficient adaptive digital echo canceller includes a frequency domain update block, a far-end signal estimation block and a time domain echo cancellation block. The echo canceller has a training mode in which the frequency domain update block and far-end signal estimation block are first trained to estimate the echo channel and target channel. After the training mode, the time domain echo cancellation block uses the estimated echo channel to synthesize an echo replica and subtracted it from the received signal continuously before or in an operation mode. When a synchronization frame is received in the operation mode, the frequency domain update block and the far-end signal estimation block are used to retune both echo channel and target channel for improving system performance.