×

Gain control circuit, FM receiver and computer program product

  • US 8,644,780 B2
  • Filed: 01/25/2012
  • Issued: 02/04/2014
  • Est. Priority Date: 09/29/2011
  • Status: Active Grant
First Claim
Patent Images

1. A gain control circuit that controls an audio output reproduced by an FM receiver according to a magnitude of a noise component included in an audio signal, the gain control circuit comprising:

  • a noise level measurement circuit that measures a noise level in an audio signal output from an FM detector and outputs a control signal corresponding to the noise level; and

    a preamplifier that reduces an output according to a value of the control signal,wherein the preamplifier reduces a gain as the value of the control signal increases and maintains the gain after the value of the control signal has exceeded a predetermined threshold value.

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