×

Circuit for digital processing of audio signals

  • US 5,491,755 A
  • Filed: 01/18/1994
  • Issued: 02/13/1996
  • Est. Priority Date: 02/05/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. A circuit for digital processing of audio signals in a vehicle radio receiver, comprising:

  • a digital filter serving as a tone control of the radio receiver, said digital filter having a frequency response which is controllable responsive to supplied coefficients; and

    a volume control for controlling a volume of the radio receiver responsive to control signals;

    said digital filter having controllable low frequency, high frequency and medium frequency transfer profiles, said transfer profiles being controlled responsive to respective control signals such that when at least one of said high and low frequency transfer profiles of said digital filter is increased relative to said medium frequency transfer profile, said medium frequency transfer profile of said digital filter is decreased; and

    a control signal corresponding to the decrease of the medium frequency transfer profile of said digital filter being supplied to said volume control to cause said volume control to compensate a volume of the vehicle radio receiver based on the decrease of the medium frequency profile of the digital filter;

    whereby the decrease in the medium control frequency transfer profile of said digital filter normalizes a transmission factor for the at least one of the high and low frequency transfer profiles that was increased.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×