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A sound encoding method and system based on band-limited orthogonal components

A technology of quadrature component and sound encoding, applied in speech analysis, ear therapy, instruments, etc., can solve the problem of providing richer information for those who cannot be implanted

Active Publication Date: 2014-10-29
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0015] The purpose of the present invention is to provide a sound coding method and system based on band-limited orthogonal components in order to overcome the defect that the existing cochlear implant sound coding technology cannot provide richer information to the implanter

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  • A sound encoding method and system based on band-limited orthogonal components
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  • A sound encoding method and system based on band-limited orthogonal components

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Embodiment Construction

[0062] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0063] The present invention provides a sound coding strategy and system based on band-limited quadrature components. The method will utilize band-limited quadrature components of one or more band-pass signals to generate stimulation signals for each electrode channel, said method comprising:

[0064] Step 1) The audio signal x(t) collected by the microphone is divided into frequency bands, and the principle of frequency division can be according to the cochlear physiological model, logarithmic model, Mel frequency model, etc.;

[0065] Step 2) The signal x after the sub-band processing k (t) Orthogonal coherent demodulation is performed to obtain two orthogonal components u k (t) and v k (t). where x k (t) has a frequency range of [f ck -B / 2,f ck +B / 2], f ck is the center frequency;

[0066] Step 3) calculate to get Equivalent to...

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Abstract

The invention relates to a sound encoding method and system based on band-limited orthogonal components. The method is used for generating input signals of artificial cochlea electrodes and comprises the following steps: the step 101) carrying out sub-band processing on audio signals collected by a microphone to obtain sub-band signals xk(t); the step 102) carrying out orthogonal coherent demodulation on the signals xk(t) obtained after the sub-band processing to obtain two band-limited orthogonal components uk (t) and vk (t); the step 103) carrying out calculation to obtain an envelope signal mk, 0 (t) of the xks(t) according to the two band-limited orthogonal components; the step 104) combining the uk (t) and the vk (t) based on a certain combination mode, and taking the combination result as small oscillation to add with the mk, 0 (t) to obtain exciting signal amplitude mk(t) ; the step 105) carrying out nonlinear dynamic range compression on the obtained exciting signal amplitude mk(t) to obtain m 'K (t) according to the phonosensitive threshold value of each electrode channel of a person implanted with an artificial cochlea; and the step 106) sending the m 'K (t) which has been subjected to pulse string modulation to the artificial cochlea electrodes.

Description

technical field [0001] The present invention proposes a sound coding method and system based on band-limited quadrature components, which are suitable for cochlear implants and other electrical stimulation hearing aids using frequency division, and specifically relates to a band-limited quadrature component-based sound coding method and system. Background technique [0002] The vocoder model is a classic model in audio coding. In order to transmit the voice signal within the limited communication bandwidth, the vocoder model processes the voice signal in frequency bands and extracts the envelope of the output signal in each frequency band. The envelope signal of the frequency band and the detected pitch information and voicing information are transmitted through the communication line, which can reduce the data bandwidth. [0003] Vocoder models are also used in speech synthesis and instrument sound synthesis. In addition, some studies have shown that the semantics can be e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/20G10L19/26G10L25/84A61F11/04
Inventor 冯海泓孟庆林赵建平原猛陈友元
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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