Method for changing voice by means of speech tone modification on basis of derivative glottal flow models

A technology of glottis and models, applied in speech analysis, instruments, etc., can solve problems such as the inability to realize flexible control of voice sources, and achieve the effects of wide practical value, simple method, low-speed transmission and storage

Active Publication Date: 2018-07-13
上海泰亿格康复医疗科技股份有限公司
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  • Application Information

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Problems solved by technology

This method also cannot achieve flexible control of the voice source.

Method used

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  • Method for changing voice by means of speech tone modification on basis of derivative glottal flow models
  • Method for changing voice by means of speech tone modification on basis of derivative glottal flow models
  • Method for changing voice by means of speech tone modification on basis of derivative glottal flow models

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Embodiment

[0052] like figure 1 As shown, the speech signal in this embodiment selects the steady-state vowel ai, the sampling frequency fs=44100Hz, and the steps are as follows:

[0053] Step1: The voice signal of ai is recorded as S, and the preprocessed signal is recorded as S1;

[0054] After removing the DC component, S11=S-mean(S), where mean is the mean value; S12 is obtained after pre-filtering, and an ellipse filter is selected for pre-filtering, which is recorded as lvboqi1: passband frequency range 60~2000Hz, stopband range 55~3400Hz, pass-band ripple 1dB, stop-band attenuation 15dB; pre-emphasis coefficient is selected -0.95, the signal after pre-emphasis is recorded as S13; The signal is denoted as S1.

[0055] Step2: S2 is obtained after windowing and dividing S1 into frames;

[0056] The window function selects a rectangular window; the segment duration is initially set to t, the unit is ms, the range is 10 to 30, and the exact value is the integer power of 2 about t×fs...

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Abstract

The invention discloses a method for changing voice by means of speech tone modification on the basis of derivative glottal flow models. The method has the advantages that tone-modified speech can besynthesized by the aid of linear prediction coding technology and derivative glottal flow combined processes, residual signals can be obtained from speech signals by the aid of LPC (linear predictioncoding) inverse filters, are first-order difference of glottal signals, and are simulated by LF models in detail to obtain high-quality glottal excitation signals, and accordingly high-quality tone-modified speech can be synthesized; the method is simple, effective and speedy and has extensive practical value, and voice sources can be flexibly controlled by te / tc and tp / tc.

Description

technical field [0001] The invention belongs to the technical field of speech synthesis, and relates to a method for changing pitch of speech, in particular to a method for changing pitch and voice based on differential glottal wave model. Background technique [0002] With the development of information technology, traditional audio and video materials can no longer meet people's needs, and speech synthesis technology that integrates linguistics, signal processing technology, computer science and other fields emerges as the times require. Among them, the non-variable voice pitch change technology has a broad application market, such as protecting the privacy of the speaker, providing some kind of entertainment effect, helping patients with incomplete or damaged language function to restore their voice, and being used for voice mail, radio station voice change hotline, Multimedia sound effect processing, military confidential communication, etc., can be widely used in civil,...

Claims

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Application Information

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IPC IPC(8): G10L19/04G10L19/087G10L19/18G10L19/26G10L21/013G10L25/45
CPCG10L19/04G10L19/087G10L19/18G10L19/265G10L21/013G10L25/45G10L2021/0135
Inventor 周林灿申炎仃黄昭鸣孙海霞
Owner 上海泰亿格康复医疗科技股份有限公司
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