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Method for identifying Chinese Putonghua orphaned word base on base frequency envelope

A fundamental frequency envelope and recognition method technology, applied in the field of isolated word recognition in Mandarin Chinese, to achieve a high correct recognition rate

Inactive Publication Date: 2009-04-15
ZHEJIANG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese is a tonal language, and the Pitch Contour can reflect Chinese tones to a certain extent. There are still very few studies on applying the research on Chinese tones to the recognition of Chinese isolated words.

Method used

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  • Method for identifying Chinese Putonghua orphaned word base on base frequency envelope
  • Method for identifying Chinese Putonghua orphaned word base on base frequency envelope
  • Method for identifying Chinese Putonghua orphaned word base on base frequency envelope

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Embodiment 1

[0028] Embodiment 1, Figure 2 ~ Figure 4 A method for identifying isolated words in Mandarin Chinese based on the fundamental frequency envelope is proposed, including storing some commonly used words in the template library in the form of fundamental frequency envelopes, and then performing the following steps in sequence:

[0029] 1), voice cutting:

[0030] Use short-term energy to detect voice endpoints: After the voice signal is sampled, calculate the energy of each frame of the voice signal, if the energy is greater than a certain threshold, keep the frame, otherwise remove the frame. The parameters of voice cutting are shown in Table 1 below:

[0031] Table 1. Speech cutting parameters

[0032] silence threshold

[0033] 2), extract the fundamental frequency feature of speech;

[0034] Extract the fundamental frequency of the speech using an autocorrelation algorithm. The autocorrelation algorithm refers to the algorithm for estimating the fundamental fre...

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Abstract

The invention discloses a method used for identifying isolated word of standard Chinese on basis of basic frequency envelope. The method comprises: a vocabulary is stored in a template library in advance in the form of basic frequency envelope. The method further comprising the steps in sequence as follows: 1) the speech is cut and the noise is reduced; 2) the basic frequency characteristics of the speech are extracted; 3) judgment: when the language material is used for training, that is to say, when no corresponding vocabulary exists in a corpus, the step 4) is started; when the language material is used for identifying, the step 5) is started; 4) the basic frequency characteristics of the language material is added into the template library; 5) the similarities between the test speech and the basic frequency envelope of the template are compared and the vocabulary represented by the template with the minimum distance to the test speech is taken as the identification result; 6) the identification result is output. By researching the tone of Chinese, the method of the invention is capable of identifying the isolated word of standard Chinese by comparing the similarities between the test speech and the basic frequency envelope of the template.

Description

technical field [0001] The invention relates to an isolated word recognition technology, in particular to a method for identifying isolated words in Mandarin Chinese by comparing the similarity between test speech and fundamental frequency envelopes of templates. Background technique [0002] Talking to a machine so it can understand what you say has been a long-held dream. Speech recognition technology is a technology that allows machines to convert voice signals into corresponding text or commands through the process of recognition and understanding. Speech recognition is an interdisciplinary subject. The fields involved in speech recognition technology include: signal processing, pattern recognition, probability theory and information theory, sound mechanism and auditory mechanism, artificial intelligence and so on. In the past two decades, speech recognition technology has made remarkable progress and has begun to move from the laboratory to the market. It is expected...

Claims

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Application Information

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IPC IPC(8): G10L15/08
Inventor 杨莹春吴朝晖魏春明
Owner ZHEJIANG UNIV
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