Method of determining parameters of a pitch synthesis filter in a speech coder, and speech coder implementing such method
AssigneeFrance Telecom
InventorDominique Massaloux
Life of this patent
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Abstract
A long-term analysis of an input speech signal is carried out to adaptively select parameters of a pitch synthesis filter in respective variation ranges. Successively selected values of said parameters are processed to estimate maximum magnitudes of an error component of the output signal of the pitch synthesis filter. The variation range of at least one of said parameters is determined on the basis of the estimated maximum magnitudes.
Claims10
A method of determining parameters of a pitch synthesis filter in a speech coder, comprising long-term analysis of an input speech signal to adaptively select said parameters in respective variation ranges, wherein successively selected values of said parameters are processed to estimate maximum magnitudes of an error component of an output signal of the pitch synthesis filter, and wherein the variation range of at least one of said parameters is determined on the basis of the estimated maximum magnitudes.
A speech coder comprising:
- long-term analysis means for adaptively selecting parameters of a pitch synthesis filter in respective variation ranges based on an input speech signal;
- and error estimation means for estimating, from successive values of said parameters, maximum magnitudes of an error component of an output signal of the pitch synthesis filter, wherein the variation range of at least one of said parameters is determined on the basis of the estimated maximum magnitudes.
Dependencies are inferred from the claim text.