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High-biological-simulation speech processing filter

A speech processing and filter technology, applied in speech analysis, instruments, impedance networks, etc., can solve the problems of easy distortion and poor recognition effect, and achieve the effect of high biological simulacrum and low power consumption

Active Publication Date: 2018-03-13
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a high biological fidelity voice processing filter and voice recognition equipment, aiming to solve the problem of poor recognition effect and easy Distortion problem

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Embodiment Construction

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0017] see figure 1 and figure 2 , the high biological fidelity voice processing filter in the embodiment of the present invention can be applied to speech recognition devices such as cochlear implants and hearing aids, and the high biological fidelity voice processing filter is composed of a bandpass filter unit 10 (BandPass Filter, BPF), A ninth-order filter constructed by cascading a low-pass filter unit 20 (Low Pass Filter, LPF) and an elliptic low-pass filter unit 30 (Elliptic Filter, ELF) sequentially, wherein the center frequency of the ninth-order filter ...

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Abstract

The invention provides a high-biological-simulation speech processing filter being a nine-order filter constructed by successive cascade connection of a band-pass filter unit, a low-pass filter unit,and an elliptic low-pass filter unit. The central frequency of the nine-order filter is adjusted by the low-pass filter unit. Therefore, with combination of frequency response characteristics of the biological cochlea, a sound response curve near a specific center frequency can be subdivided into a gentle passive section, an active section with selectivity, and a cut-off section with an abrupt change; the gentle passive section is processed by band-pass filtering; the active section with selectivity is processed by low-pass filtering; and the cut-off section with an abrupt change is processedby an elliptical low-pass filter unit. Therefore, the speech processing with high biological-simulation property and low power consumption is realized.

Description

technical field [0001] The invention relates to the field of voice recognition, in particular to a voice processing filter and voice recognition equipment with high biological fidelity. Background technique [0002] The key part of people's perception of sound is the cochlea of ​​the ear. Different parts of the cochlea's perception of sound target different frequencies. The response frequency distribution ranges from about 20Hz to 20KHz from the apex of the cochlea to the bottom of the cochlea. In addition, according to existing scientific research, the biological cochlea has a specific frequency response curve to sound. The current speech processing filters basically use ordinary analog band-pass filters or digital filters, without considering the sound frequency response characteristics of the biological cochlea. [0003] Human speech itself is in the continuous time domain. The form of digital filtering first needs to convert the analog signal into a digital signal. Accor...

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Application Information

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IPC IPC(8): G10L21/0208H03H17/02H03H17/00
CPCG10L21/0208H03H17/0252H03H2017/0072
Inventor 张金勇王磊
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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