Fundamental frequency contour extraction artificial cochlea speech processing method and system

A cochlear implant and contour extraction technology, applied in the field of medical devices, to achieve the effect of minimizing the overall calculation amount

Active Publication Date: 2016-04-20
ZHEJIANG NUROTRON BIOTECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on real-time extraction of fundamental frequency information on all commercial cochlear implant speech processors

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  • Fundamental frequency contour extraction artificial cochlea speech processing method and system
  • Fundamental frequency contour extraction artificial cochlea speech processing method and system
  • Fundamental frequency contour extraction artificial cochlea speech processing method and system

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] see figure 1 and Figure 3-6 , which shows a flow chart of the steps of the cochlear implant speech processing method for extracting the fundamental frequency contour and the waveform diagram of each step in the embodiment of the present invention, including the following steps:

[0040] S101, down-sampling the received acoustic signal of one frame to ensure the trend shape of the signal and reduce the overall calculation amount;

[0041] S102, the first low-pass filter, removing high-order harmonics, and retaining signals within the effective frequency;

[0042] S103, first-order derivation, retaining the periodicity and trend shape of the signal, and reducing the signal amplitude;

[0043] S104, reducing order difference, using the nature of the periodic signal, by comparing the absolute value of the difference between the origi...

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Abstract

The invention discloses a fundamental frequency contour extraction artificial cochlea speech processing method and system. The method comprises the steps of: performing downsampling on a received frame of acoustical signals; performing first low pass filtering; performing first derivation, maintaining the periodicity and trend shape of signals and reducing signal amplitudes; reducing order difference, and determining a periodic point at a smallest difference absolute value through comparing the difference absolute value between an original signal and a time shifting signal; performing secondary low pass filtering, and smoothing signals, especially each bottom; searching for a smallest value and a second smallest value of a current frame, and voiding doubling or halving of a fundamental frequency; and comparing two continuous frames of smallest values to obtain a periodic change value delta T. The method and system solve the calibration problem in fixed-point calculation to the maximum, guarantee signal periodicity, and reduce a total amount of calculation; in addition, the method and system track a baseband signal envelop change rate instead of a fundamental frequency absolute value to minimize the total amount of calculation; meanwhile, the parameter selection for adjusting the change rate can be flexibly applied to an artificial cochlea strategy.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a cochlear implant speech processing method and system for extracting fundamental frequency contours. Background technique [0002] The fundamental frequency of speech plays an extremely important role in language understanding. In Chinese, the fundamental frequency plays a decisive role in distinguishing the four tones of Mandarin. Fundamental frequency is the essential component of Mandarin tones, and it is a sufficient and necessary sign to identify Mandarin tones. [0003] Fundamental frequency extraction is a fundamental problem in speech signal processing. In the past 40 years, people have proposed hundreds of fundamental frequency extraction algorithms. Different application scenarios determine the complexity and robustness of the algorithm. Fundamental frequency extraction algorithms applied to real-time signal processing have always been the focus of speech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/007A61F11/00A61F2/18
CPCG10L21/007G10L21/0208A61F2/18A61F11/00
Inventor 平利川傅前杰
Owner ZHEJIANG NUROTRON BIOTECH
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