1. DSP performs voice process part, including voice compression, echo cancellation, tone activity detection, tone detection and generation, voice packet, these are signal process scope.

2. The acoustic echo cancellation technique and Speech Enhancement technique have become hotspots in the communication world.

3. Adaptive algorithms are applied to real-time stereophonic acoustic echo cancellation to improve the communication quality of teleconference.

4. Computer simulation results indicate that the simplified algorithms are effective channel echo cancellation.

5. At the same time, it combines decorrelation technology, and finally the effect of echo cancellation is gotten better.

6. Sub-band Adaptive Filtering (SAF) algorithm is a major method to deal with the acoustic echo cancellation (AEC) problem with long reverberation time.

7. Fractional delay filters are applied to a wide range such as communications, speech processing, echo cancellation, etc.

8. The results of computer simulation show that this method has a remarkable performance in echo cancellation.

8. try its best to gather and create good sentences.

9. In the second chapter, this paper introduces the typical arithmetic of single-channel echo cancellation, such as LMS and RLS algorithm.

10. In this paper, a sub - band stereo acoustic echo cancellation using human auditory characteristics is proposed.

11. Adaptive algorithms are applied to real - time acoustic echo cancellation to improve the communication quality of teleconference.

12. A novel adaptive method based on feed-forward neural networks for echo cancellation is proposed in this paper.

13. So, a new algorithm with two - filters for the echo cancellation is proposed.

14. Doubletalk detection(DTD) is used to sense whether the far-end speech is corrupted by the near-end speech in echo cancellation.

15. Firstly it reviews and compares the two major ways to achieve echo cancellation, which are the acoustic echo canceller (AEC)and acoustic echo suppressor (AES) in frequency domain.

16. It ensures users a better communication experience by mechanisms of AGC (automatic gain control), AEC (automatic echo cancellation) and ANS (automatic noise suppression).