发明名称 |
Method and apparatus for canceling noise in a microphone communications path using an electrical equivalence reference signal |
摘要 |
In a technique for canceling noise from a microphone communications path, an electrical equivalence circuit which is positioned close to and electrically matched to the microphone produces a signal free reference signal. The microphone converts speech to a voice signal. An analog multiplexer alternately switches from the microphone to the electrical equivalence circuit to produce a multiplexed analog signal composed of the voice signal from the microphone and the signal free reference signal from the electrical equivalence circuit. A wire connects the output of the analog multiplexer switch to an A/D converter. The wire picks up noise from the surrounding environment. The A/D converter converts the multiplexed signal having the noise to a plurality of voice samples taken from the voice signal portion of the multiplexed signal and a plurality of noise samples taken from the signal free reference signal portion of the multiplexed signal. A noise cancellation unit applies a noise suppression algorithm (e.g., spectral subtraction) to the plurality of noise samples and the plurality of voice samples to reproduce the voice signal with the noise suppressed. |
申请公布号 |
AU5526300(A) |
申请公布日期 |
2000.12.28 |
申请号 |
AU20000055263 |
申请日期 |
2000.05.29 |
申请人 |
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) |
发明人 |
JIMENEZ FELTSTROM. ALBERTO;NILS CHRISTENSSON |
分类号 |
H04R3/00 |
主分类号 |
H04R3/00 |
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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