Impedance-analysis-based vocal cord detecting device and impedance-analysis-based signal detecting method

Abstract

An impedance-analysis-based vocal cord detecting device comprises a sine-wave generator, an isolator, a current detecting module, a current-voltage switching module, a summing unit, a demodulating module, an analog to digital converting module and a digital signal processing and controller. The sine-wave generator provides sine excitation signals, the current detecting module detects current generated when the sine excitation signals are applied to a throat, the current-voltage switching module switches the current into voltage, the summing unit sums the voltage and sine signals with same frequency and reverse phase of the sine excitation signals, the demodulating module demodulates output of the summing unit and the sine signals, the analog to digital converting module coverts demodulates signals into digital signals, and the digital signal processing and controller processes the digital signals to generate electric glottis image signals. The invention further discloses a corresponding signal detecting method. Compared with the existing vocal cord detecting schemes, the impedance-analysis-based vocal cord detecting device can improve detecting accuracy.

Description

technical field [0001] The invention relates to vocal cord detection technology, in particular to a vocal cord detection device and signal detection method based on electrical impedance analysis. Background technique [0002] The traditional method of using laryngoscope and laryngoscope to detect vocal cords is invasive to a certain extent, and interferes with the conditions of vocalization, and cannot reflect the vibration mode of vocal cords objectively and conveniently. The known scheme of using electroglottogram technology for vocal cord detection uses envelope detection or absolute value circuit for detection. The disadvantage is that it cannot distinguish the interference of different carriers, the signal-to-noise ratio is low, and there is a threshold effect. Girls and other people with small changes in throat resistance have difficulty in measuring and have large errors. Contents of the invention [0003] The object of the present invention is to overcome the defi...

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Problems solved by technology

[0002] The traditional method of using laryngoscope and laryngoscope to detect vocal cords is invasive to a certain extent, and interferes with the conditions of vocalization, and cannot reflect the vibration mode of vocal cords objectively and conveniently

The known scheme of using electroglottogram technology for vocal cord detection uses envelope detection or absolute value circuit for detection. The disadvantage is that it cannot distinguish the interference of different carriers, the signal-to-noise ratio is low, and there is a threshold effect. Girls and other people with small changes in the throat resistance value are difficult to measure and have large errors

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