| 摘要 |
The presence of human voice signals in audio signals is detected by a method and apparatus based on the recognition that fundamental frequency components of human voice signals are separated from one another by a characteristic frequency difference ranging from about 120 hertz to about 180 hertz. A limited frequency band portion of the audio signals is mixed and filtered to produce a signal containing the difference frequencies of the frequency components included in the limited frequency band portion of the audio signals, and the latter signal is processed to determine whether it contains a component of significant magnitude representing the human voice characteristic difference frequency.
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