Adaptive tilt compensation for synthesized speech

摘要

There is provided a method of using an adaptive tilt compensation by a speech decoder. The method comprises receiving a bit stream including a plurality of parameters representative of a speech signal; identifying an adaptive code vector and a fixed code vector using the plurality of parameters; scaling the adaptive code vector and the fixed code vector to generate a scaled adaptive code vector and a scaled fixed code vector; summing the scaled adaptive code vector and the scaled fixed code vector to generate a synthesized output; calculating a first reflection coefficient based on the plurality of parameters representative of the speech signal; multiplying the first reflection coefficient by a factor to generate a tilt factor; and applying the tilt factor to the synthesized output based on an encoding bit rate.

主权项

1. A method of using an adaptive tilt compensation by a speech decoder and generating a speech signal, the method comprising:
receiving a bit stream including a plurality of parameters representative of the speech signal; identifying an adaptive code vector and a fixed code vector using the plurality of parameters; scaling the adaptive code vector and the fixed code vector to generate a scaled adaptive code vector and a scaled fixed code vector; generating a first synthesized output using the scaled adaptive code vector and the scaled fixed code vector; generating a tilt factor based on the plurality of parameters representative of the speech signal and an encoding rate, wherein the tilt factor is generated by calculating a first reflection coefficient and multiplying the first reflection coefficient by a factor; applying the tilt factor to the first synthesized output to generate a second synthesized output; and converting the second synthesized output into the speech signal; wherein the converting of the second synthesized output into the speech signal comprises applying a synthesis filter to the second synthesized output, and wherein the generating a tilt factor comprises increasing the tilt factor as the encoding rate decreases while decoding the speech signal.