| 摘要 |
An audio tape recorder having particular utility for retrofitting vehicles having radios, tape players, or other audio generating devices has an automatic signal level control circuit adaptable to very wide ranges of input circuit level. The circuit has a variable resistor in parallel with the audio output having a resistance level dependent on the voltage output of a digital voltage counter. The voltage counter sets out a discrete stepped output dependent on signals generated from a peak detector, which detects input signal peaks above a preset level, and a low level detector, which detects average input signal levels below a predetermined level. A delay switch prevents the low level detector from actuating the counter for a preset period.
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