NE572 compander as filter?

Paul Perry pfperry at
Mon Jun 16 09:52:28 CEST 1997

In the Signetics data sheet for NE572 compander it says applications include
state variable filter.....anyone know how?

and can anyone point me to a circuit where the attack and decay (of the
rectifier section of this chip)are continuously variable?

thanks, paul perry

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