Low bit rate voice coding method and system

Details Low bit rate voice coding method and system Low bit rate voice coding method and system

1989-03-07

1990-06-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375122, 381 29, 381 31, H04B 166, H04B 1406

Patent

active

049339575

ABSTRACT:
This low bit rate voice encoding involves short-term predictive filtering the voice signal s(n) using partial correlation related coefficients derived from pre-emphasized s(n), and deriving a short term signal r(n); then deriving a long-term residual signal e(n) by subtracting a delayed synthesized short term b.r'(n-31 M) from said r(n); and code excited encoding e(n) into codeword references k's and associated gains G's.

REFERENCES:
patent: 4191858 (1980-03-01), Araseki
patent: 4569075 (1986-02-01), Nussbaumer
patent: 4790015 (1988-12-01), Callens et al.
patent: 4821324 (1989-04-01), Ozawa et al.

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