| 摘要 |
Speech presence is detected by first bandpass filtering ( 141, 143, 145 ) the speech to split it into banks of sub-bands. A matrix of shift registers ( 150 ) store each sub-band of speech. A power determining circuit ( 259 ) then determines individual power measurements of the speech stored in each shift register element. A variance combining circuit ( 160 ) combines the individual power measurements to provide a variance for the individual shift registers. A comparator circuit ( 170 ) finally compares the variance with at least one threshold to indicate whether speech is detected.
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