CN203244392U - Vocal cord detecting device based on electric impedance analysis - Google Patents

Vocal cord detecting device based on electric impedance analysis Download PDF

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CN203244392U
CN203244392U CN 201320195858 CN201320195858U CN203244392U CN 203244392 U CN203244392 U CN 203244392U CN 201320195858 CN201320195858 CN 201320195858 CN 201320195858 U CN201320195858 U CN 201320195858U CN 203244392 U CN203244392 U CN 203244392U
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sine
module
wave generator
current
signal
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但果
岑俊龙
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Shenzhen University
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Shenzhen University
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Abstract

A vocal cord detecting device based on electric impedance analysis comprises a sine-wave generator, an isolator, a current detecting module, a current-voltage conversion module, a summator, a demodulation module, an analog-digital conversion module and a digital signal processing and control device. The sine-wave generator provides sine excitation signals. The current detecting module detects the current generated after the sine excitation signals are exerted on the throat. The current-voltage conversion module converts the currents to voltages. The summator adds the voltages and sine signals with the phase opposite to that of sine excitation signals and the same frequency as the sine excitation signals. The demodulation module demodulates output signals of the summator and the sine signals having the phase same as that of sine excitation signals and the same frequency as the sine excitation signals and provided by the sine-wave generator. The analog-digital conversion module carries out analog-digital conversion on the demodulated signals to generate digital signals. The digital signal processing and control device processes the digital signals to generate electric glottis image signals. Compared with an existing vocal cord detecting scheme, the device can improve detecting accuracy.

Description

Vocal cords checkout gear based on the electrical impedance analysis
Technical field
This utility model relates to the vocal cords detection technique, particularly relates to a kind of vocal cords checkout gear of analyzing based on electrical impedance.
Background technology
The scheme that tradition uses laryngoscope, laryngostroboscope to carry out the vocal cords detection has certain invasive, and has disturbed the condition of sounding, can not reflect objective, easily the vocal cord vibration pattern.The known ElectroglottographicWaveform technology of utilizing is carried out the scheme that vocal cords detect, use envelope detection or absolute value circuit to carry out detection, its shortcoming is to distinguish the interference of different carrier, signal to noise ratio is lower, and there is threshold effect, to less people of throat's change in resistance such as child, schoolgirls, measure difficulty and error larger.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of vocal cords checkout gear of analyzing based on electrical impedance is provided, and improves the degree of accuracy that vocal cords detect.
For achieving the above object, this utility model is by the following technical solutions:
A kind of vocal cords checkout gear of analyzing based on electrical impedance, comprise sine-wave generator, isolator, current detection module, the current/voltage modular converter, adder, demodulation module, analog-to-digital conversion module and Digital Signal Processing and controller, described sine-wave generator is coupled to isolator, described current detection module is coupled to described isolator and described current/voltage modular converter, described current/voltage modular converter and described sine-wave generator are coupled to described adder, described adder is coupled to described demodulation module, described demodulation module is coupled to described analog-to-digital conversion module, described analog-to-digital conversion module is coupled to described Digital Signal Processing and controller, wherein, described sine-wave generator is used for providing the sinusoidal excitation signal that is applied to throat to described isolator; Described current detection module is applied to the electric current that produces after the throat for detection of described sinusoidal excitation signal; It is voltage that described current/voltage modular converter is used for described current conversion; Described adder be used for receiving described voltage and described sine-wave generator that provide with sinusoidal signal and additions described sinusoidal excitation signal with same frequency and reversed-phase; Described demodulation module is used for receiving that the output signal of described adder and described sine-wave generator provide with described sinusoidal excitation signal with frequently sinusoidal signal and the demodulation of homophase; Described analog-to-digital conversion module is used for the signal after the demodulation is carried out analog digital conversion generating digital signal; Described Digital Signal Processing and controller are used for described digital signal is processed generation ElectroglottographicWaveform signal.
Can further adopt following technical schemes:
Described vocal cords checkout gear also is included in the filtration module that is used for removing high fdrequency component between described demodulation module and the described analog-to-digital conversion module.
Described filtration module is bandpass amplifier, RC wave filter, LC wave filter or surperficial ultrasonic filter.
Described isolator is magnetic isolator, Capacitor apart device or electromagnetic wave isolator.
Described current detection module and described current/voltage modular converter are the structure based on current transformer or series resistance.
Described sine-wave generator is voltage controlled oscillator, direct digital synthesiser, RC agitator or crystal oscillator.
Described demodulation module is multiplier, frequency mixer, quadrature demodulator or switching detection device.
Described vocal cords checkout gear also comprise following at least one: be connected to constant-voltage amplifier between described sine-wave generator and the described current detection module, be connected to amplifier between described sine-wave generator and the described adder, be connected to amplifier between described sine-wave generator and the described demodulation module, be connected to the amplifier between described adder and the described demodulation module.
Useful technique effect of the present utility model:
Use this utility model to carry out vocal cords and detect, can effectively tell carrier wave and the interfering signal of current measurement, thereby obtain stronger signal to noise ratio, solved the problem that traditional electrical glottogram detection scheme easily is disturbed, do not have threshold effect.To less detected objects of throat's change in resistance such as child, schoolgirls, measure the vocal cords error by this utility model little, can reach better detection effect.With respect to prior art, this utility model can provide non-intruding, objective, convenient, quantitatively, vocal cord vibration mode detection accurately.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of this utility model;
Fig. 2 is a kind of circuit structure of the sine-wave generator in this utility model specific embodiment;
Fig. 3 is a kind of circuit structure of the isolator in this utility model specific embodiment;
Fig. 4 is constant-voltage amplifier, the current detection module in this utility model specific embodiment, the circuit structure of current/voltage modular converter;
Fig. 5 is the circuit structure of the amplifier between sine-wave generator and adder in this utility model specific embodiment, the multiplier;
Fig. 6 be in this utility model specific embodiment adder and and multiplier between the circuit structure of amplifier;
Fig. 7 is a kind of circuit structure of the multiplier in this utility model specific embodiment;
Fig. 8 is first's circuit structure of the bandpass amplifier in this utility model specific embodiment;
Fig. 9 is the second portion circuit structure of the bandpass amplifier in this utility model specific embodiment;
Figure 10 is the circuit structure of the analog-to-digital conversion module in this utility model specific embodiment;
Figure 11 is Digital Signal Processing in this utility model specific embodiment and a part of circuit structure of controller;
Figure 12 is Digital Signal Processing in this utility model specific embodiment and another part circuit structure of controller.
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.Should be emphasized that, following explanation only is exemplary, rather than in order to limit scope of the present utility model and application thereof.
Consult Fig. 1, in some embodiments, vocal cords checkout gear based on the electrical impedance analysis comprises sine-wave generator, isolator, current detection module, the current/voltage modular converter, adder, demodulation module, analog-to-digital conversion module and Digital Signal Processing and controller, described sine-wave generator is coupled to isolator, described current detection module is coupled to described isolator and described current/voltage modular converter, described current/voltage modular converter and described sine-wave generator are coupled to described adder, described adder is coupled to described demodulation module, described demodulation module is coupled to described analog-to-digital conversion module, and described analog-to-digital conversion module is coupled to described Digital Signal Processing and controller.Wherein, described sine-wave generator provides the sinusoidal excitation signal that is applied to throat to described isolator, described current detection module detects described sinusoidal excitation signal and is applied to the electric current that produces after the throat, described current/voltage modular converter is voltage with described current conversion, described adder receive described voltage and described sine-wave generator that provide with sinusoidal signal and additions described sinusoidal excitation signal with same frequency and reversed-phase, described demodulation module receive that the output signal of described adder and described sine-wave generator provide with described sinusoidal excitation signal with frequently sinusoidal signal and the demodulation of homophase, the signal of described analog-to-digital conversion module after to demodulation carries out analog digital conversion generating digital signal, and described Digital Signal Processing and controller are processed described digital signal and generated the ElectroglottographicWaveform signal.
In preferred embodiment, described vocal cords checkout gear also is included in the filtration module that is used for removing high fdrequency component between described demodulation module and the described analog-to-digital conversion module.
In other embodiment, described filtration module can be bandpass amplifier, RC wave filter, LC wave filter or surperficial ultrasonic filter etc.
In other embodiment, described isolator can be magnetic isolator, Capacitor apart device or electromagnetic wave isolator etc.
In other embodiment, described current detection module and described current/voltage modular converter can be the structure based on current transformer or series resistance.
In other embodiment, described sine-wave generator can be voltage controlled oscillator, direct digital synthesiser, RC agitator or crystal oscillator etc.
In other preferred embodiments, described demodulation module can be multiplier, frequency mixer, quadrature demodulator or switching detection device etc.
In preferred embodiment, described vocal cords checkout gear can also comprise the constant-voltage amplifier that is connected between described sine-wave generator and the described current detection module.
In preferred embodiment, described vocal cords checkout gear can also comprise the amplifier that is connected between described sine-wave generator and the described adder.
In preferred embodiment, described vocal cords checkout gear can also comprise the amplifier that is connected between described sine-wave generator and the described demodulation module.
In preferred embodiment, described vocal cords checkout gear can also comprise the amplifier that is connected between described adder and the described demodulation module.
Fig. 2-Figure 12 has showed the exemplary circuit that adopts in this utility model specific embodiment.
In some embodiments, the testing process according to vocal cords checkout gear examinations is as follows:
1) sine-wave generator provides the sinusoidal excitation signal that is applied to throat A to isolator aCos (2 π ft), wherein A aBe voltage amplitude, f is driving frequency;
2) this excitation is put on throat, detect electric current and be
Figure BDA00003064175600041
R wherein b+ R xBe throat's resistance, R bBe the basic resistance of throat, R xThe resistance that changes during for vocal cord vibration;
3) by the current/voltage conversion, be voltage with current conversion
Figure BDA00003064175600042
R wherein tBe the transfer resistance value;
4) generate in addition a sinusoidal signal A simultaneously bCos (2 π ft) makes wherein by control
Figure BDA00003064175600043
This sinusoidal signal and described sinusoidal excitation signal with same frequency and reversed-phase are with described voltage
Figure BDA00003064175600044
With sinusoidal signal A bCos (2 π ft) addition, output signal A a R t cos ( 2 πft ) R b + R x - A a R t cos ( 2 πft ) R b ,
Wherein because R xMuch smaller than R b, this output signal approximates
Figure BDA00003064175600046
5) generate in addition a sinusoidal signal A simultaneously cCos (2 π ft), this sinusoidal signal and described sinusoidal excitation signal are with the frequency homophase, with signal - K a A a R t cos ( 2 πft ) R b 2 R x With sinusoidal signal A cCos (2 π ft) demodulation obtains signal - K a A a A c R t ( cos ( 4 πft ) + 1 ) 2 R b 2 R x , A wherein cBe voltage amplitude, K aBe signal amplification factor K a〉=1,
Wherein can be with signal
Figure BDA00003064175600049
Obtain signal by amplifier
Figure BDA000030641756000410
Demodulation can be with signal by multiplier
Figure BDA000030641756000411
With sinusoidal signal A cCos (2 π ft) multiplies each other;
6) with signal - K a A a A c R t ( cos ( 4 πft ) + 1 ) 2 R b 2 R x Obtain signal after removing high fdrequency component - K a K b A a A c R t 2 R b 2 R x , K bBe signal amplification factor, K b〉=1,
Wherein can be to obtain signal by bandpass amplifier filtering high fdrequency component and after amplifying
Figure BDA000030641756000414
7) to signal Carry out analog digital conversion generating digital signal;
8) described digital signal is processed obtained required ElectroglottographicWaveform signal.
Those skilled in the art can understand, and K suitably is set a, K b, A a, A b, A c, R tCan effectively reduce the noise of the noise, particularly multiplier of system, to obtain good ElectroglottographicWaveform signal.
The measurement target situation: the neck section front approximately thyroid cartilage at the 7mm place sinusoidal signal excitation that is in 1-5MHz presents resistive, normal skin noinvasive the wounded resistance is about 100-1K Ω under this frequency range, the linear relationship that the contact area of vocal cords and electric conductance are directly proportional substantially, about 1 ‰, schoolgirl and child can be relative a little bit smaller to throat's change in resistance for the contact situation of vocal cords.After testing experimental verification uses embodiment of the present utility model can obtain accurately and reliably ElectroglottographicWaveform signal.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that implementation of the present utility model is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (8)

1. vocal cords checkout gear of analyzing based on electrical impedance, it is characterized in that, comprise sine-wave generator, isolator, current detection module, the current/voltage modular converter, adder, demodulation module, analog-to-digital conversion module and Digital Signal Processing and controller, described sine-wave generator is coupled to isolator, described current detection module is coupled to described isolator and described current/voltage modular converter, described current/voltage modular converter and described sine-wave generator are coupled to described adder, described adder is coupled to described demodulation module, described demodulation module is coupled to described analog-to-digital conversion module, and described analog-to-digital conversion module is coupled to described Digital Signal Processing and controller; Described sine-wave generator is used for providing the sinusoidal excitation signal that is applied to throat to described isolator; Described current detection module is applied to the electric current that produces after the throat for detection of described sinusoidal excitation signal; It is voltage that described current/voltage modular converter is used for described current conversion; Described adder be used for receiving described voltage and described sine-wave generator that provide with sinusoidal signal and additions described sinusoidal excitation signal with same frequency and reversed-phase; Described demodulation module is used for receiving that the output signal of described adder and described sine-wave generator provide with described sinusoidal excitation signal with frequently sinusoidal signal and the demodulation of homophase; Described analog-to-digital conversion module is used for the signal after the demodulation is carried out analog digital conversion generating digital signal; Described Digital Signal Processing and controller are used for described digital signal is processed generation ElectroglottographicWaveform signal.
2. the vocal cords checkout gear of analyzing based on electrical impedance as claimed in claim 1 is characterized in that, also is included in the filtration module that is used for removing high fdrequency component between described demodulation module and the described analog-to-digital conversion module.
3. the vocal cords checkout gear of analyzing based on electrical impedance as claimed in claim 2 is characterized in that, described filtration module is bandpass amplifier, RC wave filter, LC wave filter or surperficial ultrasonic filter.
4. such as each described vocal cords checkout gear of analyzing based on electrical impedance of claims 1 to 3, it is characterized in that, described isolator is magnetic isolator, Capacitor apart device or electromagnetic wave isolator.
5. such as each described vocal cords checkout gear of analyzing based on electrical impedance of claims 1 to 3, it is characterized in that, described current detection module and described current/voltage modular converter are the structure based on current transformer or series resistance.
6. such as each described vocal cords checkout gear of analyzing based on electrical impedance of claims 1 to 3, it is characterized in that, described sine-wave generator is voltage controlled oscillator, direct digital synthesiser, RC agitator or crystal oscillator.
7. such as each described vocal cords checkout gear of analyzing based on electrical impedance of claims 1 to 3, it is characterized in that, described demodulation module is multiplier, frequency mixer, quadrature demodulator or switching detection device.
8. such as each described vocal cords checkout gear of analyzing based on electrical impedance of claims 1 to 3, it is characterized in that, also comprise in following at least one: be connected to the constant-voltage amplifier between described sine-wave generator and the described current detection module; Be connected to the amplifier between described sine-wave generator and the described adder; Be connected to the amplifier between described sine-wave generator and the described demodulation module; Be connected to the amplifier between described adder and the described demodulation module.
CN 201320195858 2013-04-17 2013-04-17 Vocal cord detecting device based on electric impedance analysis Expired - Lifetime CN203244392U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103190907A (en) * 2013-04-17 2013-07-10 深圳大学 Impedance-analysis-based vocal cord detecting device and impedance-analysis-based signal detecting method
CN104799840A (en) * 2015-04-23 2015-07-29 天津大学 Single-path acquisition device and single-path acquisition method for bioelectricity and triangular wave modulated multi-path signals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103190907A (en) * 2013-04-17 2013-07-10 深圳大学 Impedance-analysis-based vocal cord detecting device and impedance-analysis-based signal detecting method
CN104799840A (en) * 2015-04-23 2015-07-29 天津大学 Single-path acquisition device and single-path acquisition method for bioelectricity and triangular wave modulated multi-path signals
CN104799840B (en) * 2015-04-23 2018-05-08 天津大学 The single channel harvester and method of biological electricity and triangular modulation multiple signals

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