A fixed bit rate speech encoder/decoder

H - Electricity – 04 – B

Patent

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H04B 1/66 (2006.01)

Patent

CA 2166723

A method of transmitting a digital signal that includes frames of frequency coefficients arranged in bands (201), with the frequency coefficients being represented by a number of bits. The method includes generating a class value (203) that corresponds to the energy in a band relative to the average energy in the other bands for each of the bands. When the number of bits exceeds a predetermined threshold (220), the number of bits is reduced (222) to a value that is less than or equal to the predetermined threshold by eliminating those of the frequency coefficients that belong to the bands having the smallest class values. The remaining frequency coefficients are then transmitted (226).

Procédé permettant d'émettre un signal numérique comprenant des trames de coefficients de fréquences disposées en bandes (201), lesdits coefficients étant représentés par un certain nombre de bits. Ce procédé consiste à générer une valeur de classe (203) correspondant au rapport de l'énergie présente dans une bande à l'énergie moyenne présente dans les autres bandes; ce rapport est calculé pour chacune des bandes. Lorsque le nombre de bits dépasse un seuil prédéterminé (220), il est ramené (222) à une valeur inférieure ou égale au seuil prédéterminé par élimination des coefficients de fréquences relevant des bandes dont les valeurs de classe sont les plus faibles. Les coefficients de fréquences restants sont alors émis (226).

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