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Circuit arrangement for influencing the frequency response of a digital audio signal

  • US 5,974,156 A
  • Filed: 02/10/1998
  • Issued: 10/26/1999
  • Est. Priority Date: 06/19/1996
  • Status: Expired due to Fees
First Claim
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1. A digital circuit arrangement for influencing the frequency response of a digital audio signal as a function of frequency and/or amplitude, characterized in that the digital circuit arrangement comprises:

  • a signal filter having variable filter coefficients, said signal filter having an input for receiving an input signal of the digital circuit arrangement;

    means for adding an output signal of said signal filter to the input signal of the digital circuit arrangement, an output signal of said adding means representing the frequency response influenced output signal of the circuit arrangement; and

    a control circuit for selecting the variable filter coefficients for the signal filter, said control circuit receiving the output signal of the signal filter and comprising;

    a control filter for receiving the output signal of the signal filter;

    a rectifier coupled to an output of said control filter;

    a pulse shaper stage coupled to an output of said rectifier;

    logarithmic means for determining a logarithmic value of an output of said pulse shaper stage; and

    a circuit for determining coefficients coupled to an output of said logarithmic means, an output of said determining means providing the variable filter coefficients for the signal filter.

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