×

Multirate digital voice communication processor

  • US 4,330,689 A
  • Filed: 01/28/1980
  • Issued: 05/18/1982
  • Est. Priority Date: 01/28/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. A multirate digital voice communication processor for generating and utilizing a high data-rate digital signal with a low data-rate subset therein to permit the direct processing of this signal at both wideband and narrowband processors without analog tandeming comprising:

  • a speech input;

    a linear predictive coding processor for decomposing an input speech signal into filter coefficient components and a prediction residual component;

    a narrowband excitation parameter extractor for representing said prediction residual component by a low data-rate digital signal;

    a wideband excitation signal encoder for representing said prediction residual component by a high data-rate digital signal;

    means for multiplexing into a data stream and transmitting said filter coefficient components, said narrowband low data-rate digital signal, and said wideband high data-rate digital signal;

    means for receiving a transmitted encoded signal and demultiplexing said filter coefficient components and said low and high data-rate digital signals therefrom; and

    means for decoding said demultiplexed encoded signals and reconstructing an approximation of the original speech prior to encoding.

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