Band-width spreading method and system for voice or audio signal

Abstract

The invention discloses a method and system for speech or audio signal bandwidth expansion, which comprises: A. to simulate spectral envelope of the high-frequency signal components in the speech or audio signal. B. to make a synthesis of the said spectrum envelope and the low-frequency signal components corresponding to the high-frequency signal components in the frequency and spatial domain to obtain the reset high-frequency signal components. The invention also discloses the method and system to realize the said bandwidth expansion, the technical scheme offered by which has the advantage of less bit number of coding that can be adaptively adjusted based on the type features of the signals. Besides, by extracting spectrum envelope of the high-frequency signal components, the invention makes the fine structure acted on the low-frequency signal components corresponding frequency and spatial domain to guarantee the correlation between the reset high-frequency signal spectrum and the harmonization of the high-frequency signal spectrum lopped during coding.

Description

technical field [0001] The present invention relates to the coding and decoding technology of voice or audio signal, in particular to a method and system for bandwidth expansion of voice or audio signal. Background technique [0002] An important part of speech or audio signal processing is speech or audio coding. Speech or audio coding technology usually needs to find a balance between the coding bit rate, coding quality, codec delay and algorithm complexity to obtain the optimal codec solution. Under the condition of limited encoding bit rate, especially in the mobile environment, considering that the human ear is more sensitive to the low-frequency signal components in speech or audio signals than to the high-frequency signal components, usually allocate more bits to encode low-frequency signals components, correspondingly only a small number of bits are allocated to encode high-frequency signal components, and in some cases even no high-frequency signal components are e...

Images