Automatic recognition method for pharyngeal fricative in cleft palate speech based on PICGTFs and SSMC enhancement

Abstract

The invention discloses an automatic recognition method for pharyngeal fricative in cleft palate speech based on PICGTFs and SSMC enhancement, which relates to the field of speech signal processing. The method uses piecewise index compression Gammatone filters PICGTFs to carry out filter processing on the speech, a speech signal spectrogram in each channel is subjected to enhancement processing based on a SSMC (Softsign-based Multi-Channel) model and a DoG (Difference of Gaussian) model, a feature vector is extracted from the enhanced spectrogram respectively and put to a KNN classifier for pattern recognition to determine whether to belong to the pharyngeal fricative, and the same classification result is taken as a final recognition result of the algorithm. The method makes full use of the differences between the pharyngeal fricative and the normal speech in frequency domain distribution of spectral energy, and in comparison with the prior art, the detection result is objective and accurate, high-degree automatic measurement is realized, reliable reference data are provided for clinical digital evaluation of the pharyngeal fricative, the development needs of precise medical treatment are met, and more accurate and effective signal classification and recognition can be carried out.

Description

technical field [0001] The invention relates to the field of speech signal processing, in particular to an automatic recognition method for cleft palate speech pharyngeal fricatives based on PICGTFs and SSMC enhancement. Background technique [0002] Pharyngeal rub, as one of the common compensatory articulation errors, is second only to the glottal stop in incidence. It is a fricative caused by the narrowing of the pharynx caused by the retraction of the speaker's tongue to the posterior pharyngeal wall. The abnormal articulation mainly occurs in the consonant part of the Mandarin syllable, because the consonant is formed by the obstruction of airflow in the oral cavity or pharynx. Pharyngeal fricatives are common in Chinese dialects, but do not occur in normal Mandarin pronunciation. Pharyngeal fricatives are divided into voiceless pharyngeal fricatives and voiced pharyngeal fricatives. The vocal cords do not vibrate when voiced pharyngeal fricatives are pronounced, whi...

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Problems solved by technology

However, the change of each parameter is still a subjective evaluation, and there are still problems of not being objective and accurate enough.

2) Analysis of time-frequency characteristics of pharyngeal fricatives based on digital signal processing technology. Corresponding studies explored the relationship between energy distribution and pharyngeal fricatives, but did not realize automatic classification and detection of pharyngeal fricatives and normal fricatives

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