頁籤選單縮合
題 名 | A Lossless Decorrelation Scheme for Stereophonic Acoustic Echo Cancellation |
---|---|
作 者 | 陳恆州; | 書刊名 | 建國學報 |
卷 期 | 18(下) 民88.06 |
頁 次 | 頁547-554 |
分類號 | 448.84 |
關鍵詞 | Stereophonic acoustic echo cancellation; Decorrelation; Critical sampling; Oversmapling; Cross-correlation; ERLE; |
語 文 | 英文(English) |
英文摘要 | In the stereophonic acoustic echo cancellation, the canceller can not efficiently cancel the accoustic echoes because of the cross-correlation between the signals of channels. In this paper, we propose a decorrelation scheme which is composed of two filter banks. In the low band (below 1 kHz), we firstly decimate the signal of one channel by critical sampling with a decimation ratio of four. Then the critical sampled signal are interpolated by zeros to equiva- lently form the signal to be decimated by a ratio of two (oversmapling). In addition, the signal of the other channel is directly decimated by two at one sample delay (uncoherent). The uncoherent oversampling (UCOS) scheme is verified by computer simulations. The results show that the cross-correlation between the signals of channels is reduced to 53.24% of the original one, and the averaging ERLE improvement is 1.6 dB. |
本系統中英文摘要資訊取自各篇刊載內容。