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

An audio signal and bandwidth expansion technology, which is applied in the field of encoding and decoding of speech or audio signals, and can solve the problem of high computational complexity

Active Publication Date: 2008-03-12
HUAWEI TECH CO LTD +1
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Problems solved by technology

The computational complexity of this scheme is relatively high, and when the correlation between the low-frequency components and high-frequency components of the signal is not strong, the scheme can only provide very limited performance gain

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

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Embodiment Construction

[0177] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0178] The present invention mainly simulates the spectrum envelope of the high-frequency signal component in the speech or audio signal, and synthesizes the spectrum envelope and the low-frequency signal component corresponding to the high-frequency signal component in the frequency domain space, thereby obtaining the reconstructed high-frequency Signal. After that, it is necessary to perform amplitude adjustment and energy smoothing processing on the reconstructed high-frequency signal at the decoding end.

[0179] Before describing the specific implementation of the present invention, it needs to be explained that the technical solution provided by the present invention is aimed at the coding and decoding technology of high-frequency si...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/14G10L19/00G10L19/12G10L19/16
Inventor 胡瑞敏张勇张灵王庭红马付伟张德军
Owner HUAWEI TECH CO LTD
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