专利汇可以提供Voice detector专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain a detector which is less in mis-detection and does not cut the head of speech by providing additionally a discriminating function based on power relating to a timewise change of spectral information of an input signal, i.e., differential power to a voice detector detecting the presence/absence of voice.
CONSTITUTION: A waveform A indicates a voltage of a voice signal in which stationary noise is mixed, a waveform B indicates its power and a waveform C denotes differential power R of the spectral information. Further, S is the head of speech. A voice input signal is inputted to a power detecting circuit 2 and a spectral information extracting circuit 3. One of the ouputs of the circuit 3 is inputted directly to a differential device 4 and the other is inputted thereto via a delay circuit 5. After an output of the differential device 4 equivalent to a difference of the spectral information i converted into power at a square device 6, the output is compared with a differential power threshold value TH
1 . Both compared values are inputted to an OR circuit 9, and the presence/absence of voice information functioning as its output is outputted from a voice detecting output terminal 11 via a hangover circuit 10.
COPYRIGHT: (C)1984,JPO&Japio,下面是Voice detector专利的具体信息内容。
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