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Circuit for separating one type signal component from another

  • US 4,638,808 A
  • Filed: 08/16/1984
  • Issued: 01/27/1987
  • Est. Priority Date: 08/16/1984
  • Status: Expired due to Fees
First Claim
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1. A signal component separating circuit receptive of a time varying signal having, in amplitude, a pulsing component coexisting with a reciprocating component where it is desired to utilize the pulsing component, comprising in combination:

  • a comparator; and

    first and second channels, each receptive of said signal and coupled to respective inputs of said comparator, each of said channels comprising a unity gain amplifier having an input connected to receive said signal and an output and further comprising a peak detection and holding circuit (PDH), the input of which is connected to said output of said unity gain amplifier, each PDH comprising a charging and discharging circuit, wherein the second channel charging and discharging circuit has a faster charging and discharging time than the first channel charging and discharging circuit and wherein the second channel PDH attenuates the input signal more than the first channel PDH such that the first channel signal at said comparator is greater in magnitude than said second channel signal at said comparator except when pulses of said pulsing component are present whereby said comparator is responsive to the first and second channel signals for producing an output signal corresponding to the presence of said pulses.

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