Perception weighting filtering wave method and perception weighting filter thererof

A technology of weighted filtering and filtering processing, which is applied in the field of speech and audio coding and decoding, can solve the problem of unsatisfactory formant structure effect of noise analog signal spectrum, and achieve the effect of reducing computational complexity, algorithmic complexity and calculation amount

Active Publication Date: 2008-12-10
HUAWEI TECH CO LTD +1
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Problems solved by technology

However, this processing scheme is not adjusted according to the characteristics of the current coded sp

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  • Perception weighting filtering wave method and perception weighting filter thererof
  • Perception weighting filtering wave method and perception weighting filter thererof
  • Perception weighting filtering wave method and perception weighting filter thererof

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Embodiment Construction

[0043] Further analysis of the masking effect mentioned in the background art shows that in the speech spectrum, the noise at the frequency band with higher energy, that is, the noise at the formant is less perceptible than the noise at the lower energy frequency band. Therefore, when distributing the error between the original speech and the synthesized speech, that is, noise, the noise can be allowed to be larger in the formant region with relatively large energy, and correspondingly, the noise is required to be smaller in the formant valley with relatively small energy. The embodiments of the present invention are based on this principle. In wideband speech coding, the purpose of improving coding efficiency and enhancing subjective auditory quality of speech coding is achieved by adjusting the noise distribution in the perceptual weighted domain.

[0044] When the perceptual weighted filtering method provided by the embodiment of the present invention performs perceptual wei...

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Abstract

The present invention discloses a perceptual weighing filtering method. The method mainly comprises treating the input voice or audio signals through spectrum inclined filtering, processing the output voice or audio signals treated through perceptual weighing filtering, selecting the corresponding weighing factor value according to the spectral flatness of the input signals, and outputting the voice or audio signals processed through the traditional perceptual weighing filtering. Moreover, part of the coefficients of the transmission function acquired in the processing of perceptual weighing filtering are directly used as the coefficients of the transmission function acquired in the processing of spectrum inclined filtering. Simultaneously, the present invention also provides a perceptual weighing filter. The perceptual weighing filter can well simulate the formant structure of the frequency spectrum of the input wideband voice or audio signals without additional encoding bit rate and reducing the computation complexity, make full use of he masking effects of human acoustic feelings, and achieve the purposes of improving the encoding efficiency and enhancing the subjective hearing effects.

Description

technical field [0001] The present invention relates to the coding and decoding technology of voice and audio, in particular to a perceptual weighted filtering technology suitable for wideband voice or audio coding and decoding systems. Background technique [0002] The auditory sensitivity of the human ear to a pure tone is affected by another pure tone that exists at the same time, but the human hearing can still clearly perceive the former pure tone. This phenomenon is called the masking effect of the human ear. [0003] When performing speech coding, the human ear masking effect can be used, that is, the noise at the formant is not easy to detect compared to the noise in the lower energy frequency band, and the formant valley can be reduced by assigning a larger distortion in the formant area. In this way, the subjective perception of greater noise can be improved, and the coding efficiency can be improved, and a better subjective auditory effect can be obtained. This s...

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Application Information

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IPC IPC(8): G10L19/02G10L19/04G10L21/003
Inventor 胡瑞敏杨玉红张勇张伟王庭红马付伟
Owner HUAWEI TECH CO LTD
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