×

Closed loop companding ratio control for continuously variable slope delta modulation

  • US 4,151,517 A
  • Filed: 02/14/1977
  • Issued: 04/24/1979
  • Est. Priority Date: 02/14/1977
  • Status: Expired due to Term
First Claim
Patent Images

1. A continuously variable slope delta modulation circuit for encoding/decoding input signals, comprising:

  • a comparator having a first input, a second input and an output, the first input being for receiving input information;

    a sampler having a first and a second input and an output, the first input being adapted for receiving clock pulses, and the second input being coupled to the output of the comparator;

    an integrator having an input and an output, the output being coupled to the second input of the comparator;

    a slope polarity switch having a first input, a second input, and an output, the output being coupled to the input of the integrator, the first input of the slope polarity switch being coupled to the output of the sampler;

    a level detect algorithm having an input and an output, the input being coupled to the output of the sampler;

    a first amplifier having a first input, a second input, and an output, the first and second inputs forming a differential input, the first input of the first amplifier being coupled to the output of the level detect algorithm;

    a companding ratio reference coupled to the second input of the first amplifier, the output of the first amplifier coupled to the second input of the slope polarity switch; and

    a second amplifier having a first input, a second input, and an output, the output being coupled to the second input of the first amplifier, the first and second inputs forming a differential input, the first input being coupled to the output of the level detect algorithm, and the second input being coupled to the output of the first amplifier.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×