AUDIO CODING SYSTEM USING CHARACTERISTICS OF DECODED SIGNAL TO ADAPT SYNTHESIZED SPECTRAL COMPONENTS

摘要

PROBLEM TO BE SOLVED: To provide techniques that can be used in low bit rate audio coding systems to improve the perceived quality of audio signals generated by such systems.

SOLUTION: A receiver in an audio coding system receives a signal conveying frequency subband signals representing an audio signal. The subband signals are examined to assess one or more characteristics of the audio signal. Spectral components are synthesized having the assessed characteristics. The synthesized spectral components are integrated with the subband signals and passed through a synthesis filterbank to generate an output signal. In one implementation, the assessed characteristic is temporal shape and noise-like spectral components are synthesized having the temporal shape of the audio signal.

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