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Digital automatic gain control circuit

  • US 4,191,995 A
  • Filed: 01/02/1979
  • Issued: 03/04/1980
  • Est. Priority Date: 01/02/1979
  • Status: Expired due to Term
First Claim
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1. Digital automatic gain control apparatus of the type including a first variable attenuator (106, 107) responsive to a first control signal (105) for applying controlled attenuation to an analog input signal (101) and a second variable attenuator (108) for applying controlled attenuation to a digital representation (103) of an output signal from the first attenuator (106, 107) to generate a gain adjusted output signal (104),digital control means (60) responsive to the gain adjusted output signal (104) for generating the first control signal (105) and for generating a second control signal (G) to cause incremental adjustment of the attenuation applied by the second attenuator (108) when the first control signal (105) maintains the attenuation applied by the first attenuator (106, 107) nominally constant and to cause a substantial adjustment of the attenuation applied by the second attenuator (108) to a prescribed intermediate setting (G0) between predetermined maximum and minimum attenuation settings (THI,TLO) for the second attenuator (108) counteracting the simultaneous attenuation adjustment of the first attenuator (106, 107).

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