| 摘要 |
An apparatus comprises a first signal circuit path, a noise gate circuit, and a control circuit. The first signal circuit path processes a first electrical signal that includes one or more signal frequencies in the audio frequency band. The first signal circuit path includes a first amplifier circuit configured to provide a first output signal to a speaker load. The noise gate circuit monitors the first electrical signal and generates a first indication when the amplitude of the first electrical signal decreases below a first specified threshold voltage value. The control circuit mutes an output of the first signal circuit path according to the generated indication. The apparatus is formed on a single integrated circuit.
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