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DIGITAL VOICE SWITCH WITH AN ADAPTIVE DIGITALLY-CONTROLLED THRESHOLD

  • US 3,832,491 A
  • Filed: 02/13/1973
  • Issued: 08/27/1974
  • Est. Priority Date: 02/13/1973
  • Status: Expired due to Term
First Claim
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1. A voice switch comprising:

  • a. means for storing a value Representing a threshold level, b. threshold detector means for providing an output threshold signal each time a voice sample applied thereto exceeds a threshold level applied thereto, c. means for connecting said value stored in said storing means to said threshold detector means, d. means for connecting periodic samples of a signal on a channel adapted to carry voice signals to said threshold detector, e. accumulator means for accumulating over a predetermined period of time a number representing the number of times said voice samples exceed said threshold value, f. adder means having first and second inputs for adding the values applied to said first and second inputs and providing the sum at an output, said first input being connected to the output of said storing means, g. first comparison means for comparing said accumulated number with a first number and for providing a value representing a positive increment to the second input of said adder means when said accumulated number is greater than said first number, h. second comparison means for comparing said accumulated number with a second number and providing a value representing a negative increment to said second input of said adder means when said accumulated number is less than said second number, and i. means responsive to the output from said adder and to maximum and minimum threshold levels for entering the output sum into said storing means if said output sum is between said maximum and minimum threshold levels.

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