×

Digital automatic gain control apparatus

  • US 4,989,074 A
  • Filed: 09/21/1989
  • Issued: 01/29/1991
  • Est. Priority Date: 09/27/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. A digital automatic gain control apparatus comprising:

  • a first variable gain amplifier for varying the amplitude of an input signal;

    an A-D converter for converting the analog output signal of said first variable gain amplifier into digital form;

    a second variable gain amplifier for varying the amplitude of the output signal of the A-D converter;

    an amplitude detector for detecting the amplitude of the output signal of said second variable gain amplifier;

    a first level comparator for comparing the output of said amplitude detector with a first reference value and outputting the difference;

    an integrator for integrating the output of said first level comparator and controlling said second gain amplifier;

    a second level comparator for comparing the output of said integrator with a second reference value and outputting the difference; and

    a control circuit for controlling said first variable gain amplifier according to the output of said second level comparator.

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