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Transient control aspects of circuit arrangements for altering the dynamic range of audio signals

  • US 4,922,535 A
  • Filed: 03/03/1986
  • Issued: 05/01/1990
  • Est. Priority Date: 03/03/1986
  • Status: Expired due to Term
First Claim
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1. A circuit for modifying the dynamic range of an input signal comprisingmeans for modifying the dynamic range of said input signal in response to a control signal to provide an output signal, andmeans for generating said control signal, said control signal generating means includingcapacitance means for smoothing the control signal,means for deriving a first signal from a signal point substantially the same dynamically as said output signal,the rate of change of amplitude with time of said first signal being less than the rate of change of amplitude with time of said output signal,means for charging said capacitance means with said first signal in response to steady-state conditions,means for deriving a second signal from a point substantially the same dynamically as said output signal,the rate of change of amplitude with time of said second signal being substantially similar to that of said output signal,means for charging said capacitance means very rapidly with said second signal in response to transient input signal conditions, andmeans for deriving said control signal from the charge on said capacitance means.

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