发明名称 |
SPECTRAL NOISE SHAPING IN AUDIO CODING BASED ON SPECTRAL DYNAMICS IN FREQUENCY SUB-BANDS |
摘要 |
<p>A technique of spectral noise shaping in an audio coding system is disclosed. Frequency decomposition of an input audio signal is performed to obtain multiple frequency sub-bands that closely follow critical bands of human auditory system decomposition. The tonality of each sub-band is determined. If a sub-band is tonal, time domain linear prediction (TDLP) processing is applied to the sub-band, yielding a residual signal and linear predictive coding (LPC) coefficients of an all-pole model representing the sub-band signal. The residual signal is further processed using a frequency domain linear prediction (FDLP) method. The FDLP parameters and LPC coefficients are transferred to a decoder. At the decoder, an inverse-FDLP process is applied to the encoded residual signal followed by an inverse TDLP process, which shapes the quantization noise according to the power spectral density of the original sub-band signal. Non-tonal sub-band signals bypass the TDLP process.</p> |
申请公布号 |
WO2009029557(A1) |
申请公布日期 |
2009.03.05 |
申请号 |
WO2008US74138 |
申请日期 |
2008.08.24 |
申请人 |
QUALCOMM INCORPORATED;GARUDADRI, HARINATH;MOTLICEK, PETR;GANAPATHY, SRIRAM;HERMANSKY, HYNEK |
发明人 |
GARUDADRI, HARINATH;MOTLICEK, PETR;GANAPATHY, SRIRAM;HERMANSKY, HYNEK |
分类号 |
G10L19/02;G10L19/04;G10L19/12 |
主分类号 |
G10L19/02 |
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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