Voice/music dual-mode coding-decoding seamless switching method
Title：
Voice/music dual-mode coding-decoding seamless switching method
Application Number：
 200710062862
Application Date：
 2007/01/19
Announcement Date：
 2007/08/29
Pub. Date：
Publication Number：
 101025918
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 11[China|beijing]
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Zhang Shuhua, Dou Weibei, Yang Huazhong, Zhang Bin
Key Words：
 coding-decoding, seamless, switching method, dual-mode, Voice/music
Abstract：
 The invention relates to a seamless switching method for voice / music dual-mode en-decoding. When a dual-mode en-decoder switches from CELP voice mode to MDCT music mode, the audio signal-rear of the final CELP frame in the time domain before switching adopts window-adding and folding process, and the overlapping nature of MDCT transforming ensures the continuity of switching. When a dual-mode en-decoder switches from MDCT music mode to CELP voice mode, the final MDCT frame before switching adopts a new window type in order to ensure there is no overlapping time domain with the first CELP frame, and the pre-coding technology ensures the continuity of switching.
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