Noise Generation in Audio Codecs

An audio encoder and coding technology, applied in the field of audio codec, to achieve the effect of good separation, saving bit rate, and maintaining the quality of noise generation
CN103477386BActive Publication Date: 2016-06-01FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Publication Date
2016-06-01

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Abstract

The spectral domain is effectively used to parameterize the background noise, thereby obtaining a background noise synthesis that is more realistic and thus results in a more transparent active to inactive phase switching.
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Description

technical field

[0001] The present invention relates to audio codecs supporting noise synthesis during inactive phases. Background technique

[0002] The possibility to take advantage of inactive periods of speech or other noise sources to reduce the transmission bandwidth is known in the art. Such schemes typically use some form of detection to distinguish inactive (or silent) phases from active (or non-silent) phases. During the inactive phase, the lower bit rate is achieved by discontinuing the transmission of the normal data stream that precisely encodes the recording signal and only sending Silent Insertion Description (SID) updates. SID updates may be transmitted at regular intervals, or when changes in background noise characteristics are detected. The SID frame can then be used on the decoding side to generate background noise with characteristics similar to the background noise during the active phase, so that the suspension of the transmission of the normal data ...

Claims

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