| 摘要 |
A zero delay continuous long term (LT) pre-processing method operable in a speech codec that introduces no delay. The present invention provides an elegant solution to perform long term (LT) pre-processing of the pitch lag of a speech signal to save a large number of bits required in various speech coding methods, including the code-excited linear prediction method. The present invention is ideal for speech coding standards and methods that any undesirable delay at the end of a speech frame of the speech signal. The present invention overcomes a significant limitation in the art of speech coding, in that, a speech coding system that performs the invention is operable while providing real time operation and introducing no delay whatsoever. In addition, the perceptual quality of a reproduced speech signal, as reproduced in accordance with the invention, is of a high quality and substantially perceptually indistinguishable from that provided using the traditional and conventional long term processing (LTP) of the pitch lag. The traditional and conventional long term processing (LTP) of the pitch lag inherently requires significantly more bits to perform the speech coding of the pitch lag of the speech signal.
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