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Vocal-cord vibration nondestructive measurement method utilizing natural sound track ultraphonic waveguide effect

A technology of vocal cord vibration and measurement method, which is applied in the directions of ultrasonic/sonic/infrasonic diagnosis, ultrasonic/sonic/infrasonic Permian technology, ultrasonic/sonic/infrasonic image/data processing, etc., and can solve problems such as limited application range, Achieve the effects of simple measuring equipment, easy laryngeal function inspection, high safety and ease of use

Inactive Publication Date: 2012-11-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods are based on optical imaging methods, but due to the linear propagation characteristics of light and the natural curved shape of the vocal tract, when using laryngoscope or high-speed video endoscope to detect vocal cord vibration, the optical fiber must be inserted into the vocal tract or the patient must Maintain a specific posture, therefore, these methods are not completely non-invasive measurement methods, and their application range is limited
All in all, the currently commonly used vocal cord vibration detection methods have their shortcomings and application limitations

Method used

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  • Vocal-cord vibration nondestructive measurement method utilizing natural sound track ultraphonic waveguide effect
  • Vocal-cord vibration nondestructive measurement method utilizing natural sound track ultraphonic waveguide effect
  • Vocal-cord vibration nondestructive measurement method utilizing natural sound track ultraphonic waveguide effect

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Experimental program
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Effect test

Embodiment 1

[0041] like figure 2 As shown, the subject is instructed to breathe into the port of the Y-shaped catheter, but not to make a sound. The signal generator generates a sinusoidal signal with a frequency of 350 kHz, and generates ultrasonic waves with a frequency of 350 kHz through an air ultrasonic transducer for transmission. Through the guidance of the Y-shaped catheter, the ultrasound is directed to the oral cavity. The ultrasonic echoes are received by another receiving air ultrasonic transducer, sampled at a sampling frequency of 100 MHz after amplification, and stored in the computer. After demodulating the ultrasonic echo signal with Hilbert transform, the Doppler frequency can be obtained. In this case of no sound, since the body belt does not vibrate, the ultrasonic reflecting surface is a static surface. The Doppler frequency value obtained by the method of the present invention is also very small, according to the formula and , it can be obtained that the spee...

Embodiment 2

[0043] like image 3 As shown in the figure, the subject is asked to speak / a / to the port of the Y-shaped catheter, and the waveform of the voice signal is as follows figure 2 (d). The signal generator generates a sinusoidal signal with a frequency of 350 kHz, and generates ultrasonic waves with a frequency of 350 kHz through an air ultrasonic transducer for transmission. Through the guidance of the Y-shaped catheter, the ultrasound is directed to the oral cavity. The ultrasonic echoes are received by another receiving air ultrasonic transducer, sampled at a sampling frequency of 100 MHz after amplification, and stored in the computer. After demodulating the ultrasonic echo signal with Hilbert transform, the Doppler frequency can be obtained. The generation of ear speech is only a non-periodic irregular speech produced by squeezing high-speed airflow through the glottis to produce audible high-speed turbulent noise, and it is an aperiodic irregular speech generated by cha...

Embodiment 3

[0045] like Figure 4 As shown in the figure, the subject was asked to face the port of the Y-shaped catheter and pronounce the vowel / a / in a normal way. Ultrasonic at 350kHz. Through the guidance of the Y-shaped catheter, the ultrasound is directed to the oral cavity. The ultrasonic echoes are received by another receiving air ultrasonic transducer, sampled at a sampling frequency of 100 MHz after amplification, and stored in the computer. After demodulating the ultrasonic echo signal with Hilbert transform, the Doppler frequency can be obtained.

[0046] The production of vowels is the result of the vibration of the body belt excitating the glottis, and the body belt produces periodic vibrations during the vocalization of vowels. Using the method of the present invention, it can be measured that, under the condition of normal vowel vocalization, the ultrasonic signal reflected from the upper surface of the body belt has obvious frequency shift. A positive Doppler freque...

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Abstract

The invention discloses a vocal-cord vibration nondestructive measurement method by utilizing a natural vocal track ultraphonic waveguide effect. The method comprises the following steps of: stimulating an ultrasonic wave through an air ultrasonic transducer, and guiding the ultrasonic wave into an oral cavity and a vocal track; transmitting the ultrasonic wave in a natural acoustic waveguide formed by a vocal track of a human body to arrive a vibrated vocal track; through reflection of a surface of the vocal track, transmitting the ultrasonic wave back to the oral cavity through the vocal track, and detecting a reflection echo through the air ultrasonic transducer; after digitalizing a reflection signal, computing frequency deviation of the reflection signal relative to a transmitting signal; obtaining relative movement speed of a refection surface of the ultrasonic wave (i.e. the surface of the vocal track) through a doppler frequency shift formula; and integrating a speed value so as to obtain a movement displacement signal of the reflection surface of the ultrasonic wave. According to the vocal-cord vibration nondestructive measurement method provided by the invention, the ultrasonic transducer has no need to be stretched into the deep part of the vocal track, an examined patient has no need to maintain a particular body posture to straighten the vocal track, and higher safety and usability are realized.

Description

technical field [0001] The invention relates to a non-invasive detection method of vocal cord vibration, in particular to a method for detecting the vertical vibration of the upper surface of vocal cord by utilizing the ultrasonic conduction effect of human vocal tract and the Doppler frequency shift effect of ultrasonic waves. Background technique [0002] Vocal fold vibration is the sound source of human speech, and it plays a key role in the production of voice. At the same time, the vocal cords are also one of the important organs of the human body, and the abnormal vibration of the vocal cords is also closely related to many throat diseases, such as vocal cord nodules, vocal cord edema, and so on. Therefore, the detection of vocal cord vibration information is of great value not only for understanding the vocalization mechanism of normal and irregular speech, but also for the prevention, diagnosis, and evaluation of certain laryngeal diseases. It is for these reasons t...

Claims

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Application Information

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IPC IPC(8): A61B8/08A61B8/00
Inventor 陶超蒋家琪吴丹刘晓峻
Owner NANJING UNIV
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