| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple and efficient hybrid type encoding algorithm and its architecture for encoding both speech and music signals suited for use in a low bit rate environment especially. SOLUTION: In this conversion encoding method suitable for use in a hybrid codec and efficient for the music signal, a common linearity prediction (LP) synthesizing filter is used for both the speech and music signals. Corresponding to the encoding of the speech or music signal, a speech exciting generator and a conversion exciting generator are switched by the LP synthesizing filter. When encoding the speech signal, a conventional CELP technology can be used, and Meanwhile, when encoding the music signal, a novel asymmetrical overlap-add transform technology is applied. When performing common LP synthesizing filtering, an LP coefficient is interpolated to a signal in an overlap-add operation area. Smooth transition is enabled when switching a speech encoding mode and a music encoding mode by a decoder. COPYRIGHT: (C)2010,JPO&INPIT
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