Method and apparatus for audio decoding

The invention provides a decoding method of an audio signal. The encoding method includes the following steps: when the audio signal corresponding to the received coding stream switched from the relatively wide bandwidth to the relatively narrow bandwidth, low band signal component of the audio sign...

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Bibliographic Details
Main Authors ZHANG LIBIN, CHEN ZHE, YIN FULIANG, ZHANG XIAOYU, DAI JINLIANG
Format Patent
LanguageChinese
English
Published 31.12.2008
Subjects
ACOUSTICS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:The invention provides a decoding method of an audio signal. The encoding method includes the following steps: when the audio signal corresponding to the received coding stream switched from the relatively wide bandwidth to the relatively narrow bandwidth, low band signal component of the audio signal is obtained and high band information is extended; the time-varying fade-out treatment is carried out to extended high band information to obtain processed high band information component; the processed high band information component and the low band signal component are combined. By the method provided by the embodiment of the invention, when the audio signal switches from the wide band to narrow band, a series of treatments, such as bandwidth detection, manual band spreading, time-varying fade-out treatment and bandwidth combination are available to realize smoothing switch from a wide band signal to a narrow band signal, thus achieving a more comfortable auditory feeling of human ears.
Bibliography:Application Number: CN2008184725