GR581 filter equivalent, adaptive highpass filter.
* unity gain 12 dB/oct. highpass Butterworth filter
* adaptive frequency range from 200 Hz to 2 kHz
* rectifier threshold set to 82 dBSPL (adjustable)
* l.
The GR581 is a level-sensitive, adaptive highpass filter comprised of a current controlled highpass filter, a half- wave rectifier, a voltage regulator for microphone bias and a separate preamplifier. The internal rectifier senses the long term avera.
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