×

Excitation synchronous time encoding vocoder and method

  • US 5,623,575 A
  • Filed: 07/17/1995
  • Issued: 04/22/1997
  • Est. Priority Date: 05/28/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for excitation synchronous time decoding of digital signals to provide speech signals, said method comprising steps of:

  • providing an input digital signal representing speech;

    determining when the input digital signal represents voiced speech, and, when the input digital signal represents voiced speech, performing steps of;

    deriving linear predictive coding parameters from said input digital signal;

    interpolating linear predictive coding parameters derived from said input digital signal to provide interpolated linear predictive coding parameters;

    reconstructing a voiced excitation function from said interpolated linear predictive coding parameters to provide a reconstructed voiced excitation function; and

    synthesizing speech from the reconstructed voiced excitation function by providing the reconstructed voiced excitation function to a lattice synthesis filter.

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