| 摘要 |
A method of suppressing background noise in a digital sound recording and reproducing system includes the steps of preselecting a specific voltage range to be considered to contain substantially all background noise, selecting a quiet sound benchmark voltage taken as zero output, defining a number of least significant bits of a digital sound signal confining the noise, defining voltages corresponding to the number of least significant bits, and replacing these voltages within the voltage range for both positive and negative most significant bits around the benchmark voltage with the benchmark voltage which clears sound signals from this type of noise. An apparatus for practicing the method employs logic circuitry providing suppression of signals within the preselected range.
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