BANDWIDTH EXTENSION METHOD AND APPARATUS

摘要

The present invention provide a bandwidth extension method and apparatus. The method includes: acquiring a bandwidth extension parameter, where the bandwidth extension parameter includes one or more of the following parameters: a linear predictive coefficient (LPC), a line spectral frequency (LSF) parameter, a pitch period, a decoding rate, an adaptive codebook contribution, and an algebraic codebook contribution; and performing, according to the bandwidth extension parameter, bandwidth extension on a decoded low-frequency signal, to obtain a high frequency band signal. The high frequency band signal recovered by using the bandwidth extension method and apparatus in the embodiments of the present invention is close to an original high frequency band signal, and the quality is satisfactory.

主权项

1. A decoder implemented bandwidth extension method, comprising:
receiving a bit stream encoded from an original signal; performing decoding operations on the bit stream, wherein a low frequency signal is generated via the decoding operations, wherein a collection of parameters is acquired via the decoding operations, and wherein the collection of parameters comprises one or more of the following parameters: a linear predictive coefficient (LPC), a line spectral frequency (LSF) parameter, a pitch period, a decoding rate, an adaptive codebook contribution signal, and an algebraic codebook contribution signal; performing, according to the collection of parameters, bandwidth extension operations on the decoded low-frequency signal, wherein a high frequency excitation signal and a high frequency energy are obtained via the bandwidth extension operations; and generating a high frequency band signal from the high frequency excitation signal and the high frequency energy, the high frequency band signal to recover a high frequency component of the original signal.