发明名称 |
MULTI-BAND NOISE REDUCTION SYSTEM AND METHODOLOGY FOR DIGITAL AUDIO SIGNALS |
摘要 |
<p>The present invention relates to a multi-band noise reduction system for digital audio signals producing a noise reduced digital audio output signal from a digital audio signal. The digital audio signal comprises a target signal and a noise signal, i.e. a noisy digital audio signal. The multi-band noise reduction system operates on a plurality of sub-band signals derived from the digital audio signal and comprises a second or adaptive signal-to-noise ratio estimator which is configured for filtering a plurality of first signal-to-noise ratio estimates of the plurality of sub-band signals with respective time-varying low-pass filters to produce respective second signal-to- noise ratio estimates of the plurality of sub-band signals. A low-pass cut-off frequency of each of the time-varying low-pass filters is adaptable in accordance with a first signal-to-noise ratio estimate determined by a first signal-to-noise ratio estimator and/or the second signal-to-noise ratio estimate of the sub-band signal.</p> |
申请公布号 |
WO2015189261(A1) |
申请公布日期 |
2015.12.17 |
申请号 |
WO2015EP62924 |
申请日期 |
2015.06.10 |
申请人 |
RETUNE DSP APS |
发明人 |
KJEMS, ULRIK;ANDERSEN, THOMAS KROGH |
分类号 |
G10L21/0232 |
主分类号 |
G10L21/0232 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|