×

ADAPTIVE DELTA MODULATION SYSTEM

  • US 3,628,148 A
  • Filed: 12/23/1969
  • Issued: 12/14/1971
  • Est. Priority Date: 12/23/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. In an adaptive delta modulation signal transmission system wherein analog and digital signals are used at different points in the system, an encoder for encoding analog signals as digital signals to be transmitted, the algorithm of the encoding process being characterized by a plurality of unique states of the encoder, a comparator circuit to which the analog signals are applied, means for periodically transmitting the comparator output in digital pulse form, first means responsive to each periodic transmission and to a digital signal indicative of the state of the encoder for producing a step pulse output of a step size and polarity which is a function of the state of the encoder and of the periodic transmission, an integrator for receiving the output of said first means, the output of said integrator being applied to said comparator, said first means further producing a digital signal indicative of the new state of said encoder, storage means for storing the digital signal indicative of the state, and means for applying the stored signal to said first means simultaneously with the next succeeding periodic transmission of said encoder.

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