发明名称 |
COMPANDING APPARATUS AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION |
摘要 |
Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation. |
申请公布号 |
KR20150098688(A) |
申请公布日期 |
2015.08.28 |
申请号 |
KR20157022089 |
申请日期 |
2014.04.01 |
申请人 |
DOLBY LABORATORIES LICENSING CORP.;DOLBY INTERNATIONAL AB |
发明人 |
HEDELIN PER;BISWAS ARIJIT;SCHUG MICHAEL;MELKOTE VINAY |
分类号 |
G10L21/034;G10L25/18;G10L25/45;H03G7/00;H04B1/66 |
主分类号 |
G10L21/034 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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