CN104688192A - Differential frequency ultrasonic-based audio sound source generating method and system and testing method and system of features of airway - Google Patents
Differential frequency ultrasonic-based audio sound source generating method and system and testing method and system of features of airway Download PDFInfo
- Publication number
- CN104688192A CN104688192A CN201510149424.9A CN201510149424A CN104688192A CN 104688192 A CN104688192 A CN 104688192A CN 201510149424 A CN201510149424 A CN 201510149424A CN 104688192 A CN104688192 A CN 104688192A
- Authority
- CN
- China
- Prior art keywords
- frequency
- sound source
- signal
- ultrasonic
- audio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a differential frequency ultrasonic-based audio sound source generating method and system and a testing method and system of features of an airway. The generating system comprises a signal generating module, a signal amplifying module and low-frequency broadband ultrasonic probes; the signal generating module is used for generating two square-wave signals different in frequency; the signal amplifying module is used for amplifying the square-wave signals so as to improve drive voltage of the low-frequency broadband ultrasonic probes and enhance effective acoustic pressure and effective acoustic power of an audio sound source finally generated; the low-frequency broadband ultrasonic probes are driven by the amplified square-wave signals respectively so as to generate two different ultrasonic waves, thus generating the controllable frequency audio sound source under nonlinear interaction. The non-invasive audio sound source-based testing method of features of the airway includes: using the audio sound source generated via differential frequency ultrasonic as an input signal of the airway, measuring an audio output signal of an outlet end of the airway, and non-invasively measuring transmission features of the airway by means of signal frequency analysis.
Description
[technical field]
The invention belongs to bio information detection field, be specifically related to a kind of audio frequency sound source without invading and produce and gaseous path's characteristics in organism carried out to method and the application system of kinetic measurement.
[background technology]
Air flue is the tube chamber system that a lot of animal and the mankind have, and it has very important function in respiratory and sound production process.In birds, air flue comprises trachea, syrinx, oral cavity, the first half of esophagus and beak; And in mammal, air flue generally comprises trachea and upper sound channel two parts, upper sound channel is divided into cavum laryngis, pharyngeal cavity, oral cavity and nasal cavity.
In sound production process, the Main Function of air flue is sympathetic response, produces the sound with different tone color by modulating sound source.When sound source excitation air flue, in sound source spectrum, each component is selectively transmitted by sound channel, and namely some harmonic component is reinforced, and some is weakened, the final frequency characteristic determining sound.The Frequency transfer of air flue determined primarily of the structure of air flue, and air passage structure is different along with the difference of sounding.Being produced as example with voice, mainly through changing the position change air passage structure of the phonatory organ such as tongue, lip, tooth, hard palate, soft palate, thus producing different voice.Therefore, gaseous path's characteristics change has material impact for the generation of sound, and the measurement of gaseous path's characteristics is significant for understanding sound production process and sound timbre feature etc.
The method of current measurement gaseous path's characteristics mainly comprises following several: the first, and Linear prediction analysis method applies wider a kind of speech analysis method, directly can pass through track characteristics on Resonance Peak Analysis extracting directly from voice signal.But the method needs closed phase in synchronous electric glottogram signal could obtain good result, is subject to influence of noise larger.The second, utilize nmr imaging technique can carry out imaging to air passage structure, then obtain air flue transmission characteristic by calculating.Although this method can obtain air passage structure information comparatively clearly, expensive, and computational process is difficult to imitate real air flue transmittance process, simultaneously because the restriction of image taking speed is difficult to obtain dynamic gaseous path's characteristics.3rd, ultrasonic electronic hard palate figure is a kind of method utilizing ultrasonic imaging technique to measure oral cavity structure in voiced process, thus utilizes vocal tract transfer function in this Structure Calculation.The method speed, but the area information that can only obtain a certain cross section, oral cavity, be difficult to the overall permanence reflecting whole air flue, have some limitations.
For the measurement of air ducting system characteristic, the most original and accurately method be exactly determine according to the input and output time function of system.Although utilize the sensors such as mike directly can gather output signal at air flue outfan (lip), but to air flue, directly apply known and controlled input signal be very difficult from external.
Therefore, if known and controlled audio frequency sound source can be applied as pumping signal from outside to air flue without what invade, so measured the output signal of air flue by real-time synchronization, just can realize the measurement to gaseous path's characteristics.
[summary of the invention]
In order to solve gaseous path's characteristics measure in the problem that applies of sound source, the present invention utilizes hyperacoustic nonlinear interaction, proposes a kind of audio frequency sound source ultrasonic based on difference frequency and produces and air flue characteristic test method and system.Particular content comprises:
The audio frequency sound source ultrasonic based on difference frequency produces a system, comprising: signal generator module: produce the square-wave signal that two frequencies are different; Signal amplification module: amplify the square-wave signal that signal generator module produces, to improve the driving voltage of ultrasonic probe, strengthens effective acoustic pressure and the effective acoustic power of the final audio frequency sound source produced; Ultrasonic probe: comprise the broad band low frequency ultrasonic transducer that two mid frequencyes are identical, drives generation two to arrange different ultrasound wave by the square-wave signal after amplifying respectively, produces the controlled audio frequency sound source of frequency by nonlinear interaction.
The frequency of the square-wave signal that described signal generator module produces is 37 ~ 43kHz.
The difference on the frequency of the square-wave signal that two frequencies that described signal generator module produces are different is f, and wherein, the scope of f is 1 ~ 5000Hz.
Described signal generator module by chip microcontroller, is provided with intervalometer in single-chip microcomputer, and the different square-wave signal of two frequencies is by Timer Controlling and output.
The audio sound source frequency scope that the described audio frequency sound source ultrasonic based on difference frequency produces system generation is 1 ~ 5000Hz.
The mid frequency of described broad band low frequency ultrasonic transducer is 40kHz, and impedance is 500 Ω, and sensitivity is 103dB, and maximum drive voltage is 150Vp-p, and the sound pressure level produced at this ultrasonic probe of 30cm range measurement reaches 108dB.
A kind of audio sound source generating method ultrasonic based on difference frequency, it is the square-wave signal of f that signal generator module produces two difference on the frequencies, these two square-wave signals are after amplifying, drive two ultrasonic transducers of ultrasonic probe simultaneously, produce the ultrasound wave that two row frequencies are different, finally produce through two hyperacoustic interactions the audio frequency sound source that frequency is f.
A kind of based on the gaseous path's characteristics method of testing without intrusion audio frequency sound source, utilize the input signal of audio frequency sound source as air flue of the ultrasonic generation of difference frequency, the audio signal simultaneously measuring air passage outlet end outputs signal as air flue, finally obtains the transmission characteristic of air flue through signal frequency analysis.
Gaseous path's characteristics test can adopt two kinds of different audio sound source forcing modes: single frequency excitation and swept frequency excitation; For single frequency excitation, directly realize generation and the excitation of single-frequency sound source by arranging frequency control parameters f, direct measuring system outputs signal and calculates gaseous path's characteristics; For swept frequency excitation, need the scope and the speed that arrange frequency sweep, wherein, maximum frequency range is 1 ~ 5000Hz, and sweep velocity is 1 ~ 5000Hz/s.
Compared with prior art, the present invention at least has following beneficial effect:
In a system of the invention, the difference on the frequency of the two row square-wave signals that the frequency of audio frequency sound source exports primarily of signal generator module determined, specifically then by arranging the FREQUENCY CONTROL that a frequency parameter f (f>0Hz) realizes audio frequency sound source.For the f value that is determined, signal generator module can generate the different square-wave signal of two frequencies, and the difference of its frequency is f Hz, drives two ultrasonic transducers after amplification simultaneously, finally produces through two hyperacoustic interactions the audio signal that frequency is f Hz.Based on the present invention, the audio sound source frequency scope that can produce is 1 ~ 5000Hz, and FREQUENCY CONTROL precision is less than 1Hz.In addition, present system can realize controlling the acoustic pressure of audio frequency sound source by control signal amplification module, its objective is to improve signal to noise ratio by improving signal intensity, finally improving certainty of measurement.
The present invention produces the known sound source of controllable precise in air flue, and directly calculate track characteristics by measuring output audio signal, the result comparing the acquisition of existing indirect measurement method is more accurate; In addition, the inventive method measuring speed is fast, compares existing method, can obtain the result of sound channel dynamic change.
[accompanying drawing explanation]
Fig. 1 technical scheme overall schematic
Fig. 2 produces hardware system figure based on the audio frequency sound source that difference frequency is ultrasonic
The program flow diagram of Fig. 3 signal generator module
Fig. 4 is based on the ultrasonic audio sound source waveform figure of difference frequency
The audio sound source waveform figure of Figure 51 ~ 2000Hz swept frequency excitation and time frequency analysis figure
[specific embodiments]
1. overall technology and embodiment
As shown in Figure 1, be overall technology involved in the present invention and embodiment schematic diagram, the generation of audio frequency sound source system, control method and the gaseous path's characteristics mainly comprised based on difference frequency is ultrasonic measures three aspects.First, the audio frequency sound source that the present invention's design achieves based on difference frequency is ultrasonic produces hardware system, can requiring that generation two difference frequencies are the square-wave signal of f Hz according to FREQUENCY CONTROL, producing the different ultrasound wave of two row frequencies through amplifying driving two low frequency ultrasound transducer.Secondly, in measuring process, be positioned over air ducting system outside by angled for ultrasonic probe, make two detecting head surfaces and target sound source position in same plane.After system starts, two row ultrasound wave due to frequency difference generation nonlinear interaction, thus produce the difference frequency signal that frequency is f Hz.Pass through FREQUENCY CONTROL f in present system within the scope of 1 ~ 5000Hz, the audio frequency sound source that frequency is f Hz can be produced in air flue.Finally, by audio frequency measurement devices such as mikes, the output signal of the air ducting system under audio sound source forcing can be obtained.Meanwhile, audio frequency sound source is the known signal controlling synthesis, therefore, when known input signal and output signal, can be realized the characteristic response function of sound channel by frequency analysis.
2. produce hardware system based on the audio frequency sound source that difference frequency is ultrasonic
Present system hardware components mainly comprises signal generator module, signal amplification module, ultrasonic probe module three parts be linked in sequence.Signal generator module is mainly for generation of the different square-wave signal of two frequencies, and its frequency range is all within the scope of 37 ~ 43kHz, and the frequency of two square-wave signals is by manually accurately controlling.The direct entering signal amplification module of square-wave signal that signal generator module exports, it mainly realizes amplifying the control of square-wave signal, object is the driving voltage in order to improve ultrasonic probe, thus strengthens effective acoustic pressure and the effective acoustic power of the final audio frequency sound source produced.Ultrasonic probe module comprises the broad band low frequency ultrasonic transducer that two mid frequencyes are 40kHz, drives the ultrasound wave that generation two row frequency is different respectively, and can produce the controlled audio frequency sound source of frequency by nonlinear interaction by the square-wave signal after amplifying.As shown in Figure 2, for the audio frequency sound source ultrasonic based on difference frequency produces hardware system figure.Wherein, signal generator module utilizes c8051f330 timer internal to produce the square-wave signal of two different frequencies of frequency between 37 ~ 43kHz.Square-wave signal can be amplified to about 30V by signal amplification module, then utilizes this signal to drive two ultrasonic probes to produce the ultrasound wave of two row different frequencies.
1) signal generator module
In present system, signal generator module is by c8051f330 chip microcontroller, controls the square wave different with exporting two frequencies respectively by the timer internal 2,3 of this single-chip microcomputer.Fig. 3 shows the program flow diagram of this signal generator module, can realize fixed frequency and to export and frequency sweep exports two kinds of different signal modes.Export for fixed frequency, only need to set the frequency of timer 2 and intervalometer 3, timer 2 is exported by IDAC port, and intervalometer 3 exports low and high level by port P0.2.For frequency sweep export, utilize cyclic program make timer 2,3 frequency according to certain speed linear change.When native system realizes, successively decreased in 37.5 ~ 40kHz scope internal linear by the frequency setting timer 2, the frequency of intervalometer 3 increases progressively in 40 ~ 42.5kHz scope internal linear, and the audio frequency sound source that can realize optional frequency section frequency sweep within the scope of 1 ~ 5000Hz controls to export.
2) signal amplification module
In present system, signal amplification module adopts the OPA454 amplifier of TI company, and it has the feature of high voltage and high current, and its effect is exactly amplified by the square-wave signal that NE555 intervalometer produces.This partial power adopts DC voltage-stabilizing-bipolar power supply to power, for ± 32V.Circuit diagram as Fig. 2 can draw, amplifier section have employed 200k Ω potentiometer, makes the amplification of this amplifying circuit be 1 ~ 21, and can regulate amplification in real time, makes output voltage maximum and undistorted.The square-wave signal high level that front end signal generating portion produces is 5V, and low level is 0V, and by amplifying, high level is amplified to 30V, and low level is still 0V.
3) ultrasonic probe
The ultrasonic probe that present system adopts is the XZR-40RSB low frequency ultrasound transducer that Yi Biao science and technology (Shenzhen) company limited produces.Its mid frequency is 40kHz, and impedance is 500 Ω, and sensitivity is 103dB, and maximum drive voltage is 150Vp-p.Be of a size of φ 14 × H9mm.The sound pressure level (SPL) produced at this ultrasonic probe of 30cm range measurement reaches 108dB.
3. produce based on the audio frequency sound source that difference frequency is ultrasonic and control
The present invention utilizes the nonlinear interaction (difference frequency characteristic) between different frequency ultrasound wave, by producing the different and adjustable ultrasonic signal of two row frequencies, realizes generation and the control of the controlled audio frequency sound source of frequency.In present system, the difference on the frequency of the two row square-wave signals that the frequency of audio frequency sound source exports primarily of signal generator module determined, specifically then by arranging the FREQUENCY CONTROL that a frequency parameter f (f>0Hz) realizes audio frequency sound source.For the f value that is determined, signal generator module can generate the square-wave signal that two frequencies are respectively (40000-f/2) Hz and (40000+f/2) Hz, the difference of its frequency is f Hz, drive two ultrasonic transducers after amplification simultaneously, finally produce through two hyperacoustic interactions the audio signal that frequency is f Hz.Based on hardware system of the present invention, the audio sound source frequency scope that can produce is 1 ~ 5000Hz, and FREQUENCY CONTROL precision is less than 1Hz.In addition, in present system, can realize controlling the acoustic pressure of audio frequency sound source by control signal amplification module, its objective is to improve signal to noise ratio by improving signal intensity, finally improving certainty of measurement.As shown in Figure 4, the signal waveform of the different frequency audio frequency sound source based on the ultrasonic generation of difference frequency is shown.For the hardware components of present system, control ultrasonic probe can be produced according to frequency parameter f and launch the different ultrasound wave of two row frequencies, under nonlinear interaction, produce the waveform with multiple frequency components.Shown in figure as upper in Fig. 4, when frequency parameter f is 1Hz, namely when the hyperacoustic frequency of two row is respectively 39999.5Hz and 40000.5Hz, black lines shows the waveform that two row ultrasound wave interactions are formed, its frequency component comprises each hyperacoustic frequency, and its difference frequency (1Hz) with and frequently (80kHz).In figure, red curve shows the difference frequency component of its 1Hz, visible, and the difference frequency signal precision controlling that present system can realize reaches at least 1Hz.In addition, Fig. 4 also show 100Hz and the 500Hz audio sound source waveform utilizing mike measurement to obtain, and be the periodic signal that frequency is single, waveform stabilization, its amplitude controls mainly through amplification module.
4. the audio sound source forcing mode of gaseous path's characteristics measurement
The present invention utilizes the input signal of audio frequency sound source as air flue of the ultrasonic generation of difference frequency, and the audio signal simultaneously measuring air passage outlet end outputs signal as air flue, finally obtains the transmission characteristic of air flue through signal frequency analysis.During measurement, two ultrasonic probes are coupled with tissue as outside, guarantee that the position of two ultrasonic probes and target sound source apply position in same plane.In measuring process, produced the audio frequency sound source of given frequency by controlled frequency parameter, measure the audio signal at air passage outlet place simultaneously.Present system achieves two kinds of different audio frequency sound source applying modes, is respectively single-frequency and applies and frequency sweep applying.Single-frequency applies namely to produce single-frequency sound source, and frequency sweep applies the frequency values namely changing sound source according to fixed rate, realizes the frequency response measurement in 1 ~ 5000Hz scope.
Based on hardware system of the present invention, the measurement of gaseous path's characteristics can adopt two kinds of different audio sound source forcing modes, is respectively single frequency excitation and swept frequency excitation.For single frequency excitation, directly realize generation and the excitation of single-frequency sound source by arranging frequency control parameters f, direct measuring system outputs signal and calculates gaseous path's characteristics.For swept frequency excitation, need the scope and the speed that arrange frequency sweep, in present system, maximum frequency range is 1 ~ 5000Hz, and sweep velocity can experimentally need to arrange between 1 ~ 5000Hz/s.As shown in Figure 5, the audio signal oscillogram that the 1 ~ 2000Hz frequency sweep for native system realization applies and time frequency analysis figure, its sweep velocity is 1000Hz/s.
Single frequency excitation and swept frequency excitation can be respectively used to the measurement of static characteristic and dynamic characteristic, no matter are single-frequency or swept frequency excitation, all need to ensure that in measuring process, air passage structure keeps certain stability within a certain period of time.For mankind's voiced process, because air passage structure changes relatively slow, experimenter can independently control, therefore, it is possible to meet measurement requirement simultaneously.For swept frequency excitation mode, sweep velocity needs experimentally to require to arrange, the too fast deviation that may occur measurement result of sweep velocity, therefore, the selection principle of sweep velocity is fast as far as possible under the prerequisite ensureing certainty of measurement, and departing from of certainty of measurement can single frequency excitation result be foundation.
The audio frequency sound source ultrasonic based on difference frequency proposed by the invention produces and the method and system tool of air flue feature measurement has the following advantages:
1) present system and measuring method without invasive, directly produce sound source in air flue inside, can minimal level of interference air ducting system, ensure the accuracy measured;
2) audio frequency sound source is accurate and controlled, can realize the measurement of single-frequency and frequency sweep two kinds of patterns, meet the kinetic measurement of gaseous path's characteristics;
3) the method and system can expand to other and directly cannot measure and need the outside practical application without invading the inside air ducting system feature measurement applied.
Claims (9)
1. produce a system based on the audio frequency sound source that difference frequency is ultrasonic, it is characterized in that: comprise with lower part:
Signal generator module: produce the square-wave signal that two frequencies are different;
Signal amplification module: amplify the square-wave signal that signal generator module produces, to improve the driving voltage of ultrasonic probe, strengthens effective acoustic pressure and the effective acoustic power of the final audio frequency sound source produced;
Ultrasonic probe: comprise the broad band low frequency ultrasonic transducer that two mid frequencyes are identical, drives generation two to arrange different ultrasound wave by the square-wave signal after amplifying respectively, produces the controlled audio frequency sound source of frequency by nonlinear interaction.
2. a kind of audio frequency sound source ultrasonic based on difference frequency according to claim 1 produces system, it is characterized in that: the frequency of the square-wave signal that described signal generator module produces is 37 ~ 43kHz.
3. a kind of audio frequency sound source ultrasonic based on difference frequency according to claim 1 produces system, it is characterized in that: the difference on the frequency of the square-wave signal that two frequencies that described signal generator module produces are different is f, and wherein, the scope of f is 1 ~ 5000Hz.
4. a kind of audio frequency sound source ultrasonic based on difference frequency according to claim 1 produces system, it is characterized in that: described signal generator module passes through chip microcontroller, be provided with intervalometer in single-chip microcomputer, the different square-wave signal of two frequencies is by Timer Controlling and output.
5. a kind of audio frequency sound source ultrasonic based on difference frequency according to claim 1 produces system, it is characterized in that: the audio sound source frequency scope that the described audio frequency sound source ultrasonic based on difference frequency produces system generation is 1 ~ 5000Hz.
6. a kind of audio frequency sound source ultrasonic based on difference frequency according to claim 1 produces system, it is characterized in that: the mid frequency of described broad band low frequency ultrasonic transducer is 40kHz, impedance is 500 Ω, sensitivity is 103dB, maximum drive voltage is 150Vp-p, and the sound pressure level (SPL) produced at this ultrasonic probe of 30cm range measurement reaches 108dB.
7. one kind based on the ultrasonic audio sound source generating method of difference frequency, it is characterized in that: it is the square-wave signal of f that signal generator module produces two difference on the frequencies, these two square-wave signals are after amplifying, drive two ultrasonic transducers of ultrasonic probe simultaneously, produce the ultrasound wave that two row frequencies are different, finally produce through two hyperacoustic interactions the audio frequency sound source that frequency is f.
8. the gaseous path's characteristics method of testing invading audio frequency sound source based on nothing based on system described in claim 1, it is characterized in that: the input signal of audio frequency sound source as air flue utilizing the ultrasonic generation of difference frequency, the audio signal simultaneously measuring air passage outlet end outputs signal as air flue, finally obtains the transmission characteristic of air flue through signal frequency analysis.
9. according to claim 8 based on without the gaseous path's characteristics method of testing invading audio frequency sound source, it is characterized in that: gaseous path's characteristics test can adopt two kinds of different audio sound source forcing modes: single frequency excitation and swept frequency excitation; For single frequency excitation, directly realize generation and the excitation of single-frequency sound source by arranging frequency control parameters f, direct measuring system outputs signal and calculates gaseous path's characteristics; For swept frequency excitation, need the scope and the speed that arrange frequency sweep, wherein, maximum frequency range is 1 ~ 5000Hz, and sweep velocity is 1 ~ 5000Hz/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510149424.9A CN104688192B (en) | 2015-03-31 | 2015-03-31 | Audio sound source based on difference frequency ultrasound is produced and air flue characteristic test method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510149424.9A CN104688192B (en) | 2015-03-31 | 2015-03-31 | Audio sound source based on difference frequency ultrasound is produced and air flue characteristic test method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104688192A true CN104688192A (en) | 2015-06-10 |
| CN104688192B CN104688192B (en) | 2017-06-06 |
Family
ID=53336068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510149424.9A Expired - Fee Related CN104688192B (en) | 2015-03-31 | 2015-03-31 | Audio sound source based on difference frequency ultrasound is produced and air flue characteristic test method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104688192B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108882851A (en) * | 2016-01-20 | 2018-11-23 | 索尼菲有限责任公司 | frequency analysis feedback system and method |
| CN112556836A (en) * | 2020-12-18 | 2021-03-26 | 浙江省计量科学研究院 | Method and device for measuring noise of pulmonary whistle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1229542A (en) * | 1996-07-17 | 1999-09-22 | 美国技术公司 | Acoustic heterodyne device and method |
| WO2000018182A1 (en) * | 1998-09-24 | 2000-03-30 | American Technology Corporation | Parametric loudspeaker with electro-acoustical diaphragm transducer |
| CN2645798Y (en) * | 2003-09-02 | 2004-10-06 | 张大威 | Ultrasonic treatment apparatus |
| CN101203062A (en) * | 2007-07-20 | 2008-06-18 | 徐利梅 | Method for numeral sound signal processing and digital type sound frequency directional loudspeaker |
| CN101984555A (en) * | 2010-11-10 | 2011-03-09 | 瑞声声学科技(深圳)有限公司 | Parametric array audio play system |
| WO2011055286A1 (en) * | 2009-11-03 | 2011-05-12 | Koninklijke Philips Electronics N.V. | Apparatus for measuring a level of a specific gas in exhaled breath |
-
2015
- 2015-03-31 CN CN201510149424.9A patent/CN104688192B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1229542A (en) * | 1996-07-17 | 1999-09-22 | 美国技术公司 | Acoustic heterodyne device and method |
| WO2000018182A1 (en) * | 1998-09-24 | 2000-03-30 | American Technology Corporation | Parametric loudspeaker with electro-acoustical diaphragm transducer |
| CN2645798Y (en) * | 2003-09-02 | 2004-10-06 | 张大威 | Ultrasonic treatment apparatus |
| CN101203062A (en) * | 2007-07-20 | 2008-06-18 | 徐利梅 | Method for numeral sound signal processing and digital type sound frequency directional loudspeaker |
| WO2011055286A1 (en) * | 2009-11-03 | 2011-05-12 | Koninklijke Philips Electronics N.V. | Apparatus for measuring a level of a specific gas in exhaled breath |
| CN101984555A (en) * | 2010-11-10 | 2011-03-09 | 瑞声声学科技(深圳)有限公司 | Parametric array audio play system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108882851A (en) * | 2016-01-20 | 2018-11-23 | 索尼菲有限责任公司 | frequency analysis feedback system and method |
| CN108882851B (en) * | 2016-01-20 | 2021-09-07 | 索尼菲有限责任公司 | Frequency analysis feedback system and method |
| CN112556836A (en) * | 2020-12-18 | 2021-03-26 | 浙江省计量科学研究院 | Method and device for measuring noise of pulmonary whistle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104688192B (en) | 2017-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pickup et al. | Influence of asymmetric stiffness on the structural and aerodynamic response of synthetic vocal fold models | |
| CN103776524B (en) | A kind of method measuring strong focusing ultrasound non-linear sound-filed simulation | |
| CN103054552B (en) | Method and system for measuring biological tissue viscoelasticity | |
| RU2013122802A (en) | METHOD AND DEVICE FOR DIAGNOSTIC OF OBSTRUCTIVE APNEA SYNDROME IN THE DREAM OF A WAKING PATIENT | |
| KR20090103408A (en) | Elastic measurement system of biological tissue using ultrasonic wave | |
| US20170014082A1 (en) | System and Method for Evaluating Vocal Function Using an Impedance-Based Inverse Filtering of Neck Surface Acceleration | |
| WO2013111001A1 (en) | Diagnosing lung disease using transthoracic pulmonary doppler ultrasound during lung vibration | |
| JP2013517022A5 (en) | ||
| CN109745077A (en) | Based on the elastic characteristic detection method for focusing ultrasonic sound and vibration signal | |
| CN104688192B (en) | Audio sound source based on difference frequency ultrasound is produced and air flue characteristic test method and system | |
| CN102680076B (en) | Device for simulating human vocal cord vibration and implementation method thereof | |
| WO2016065955A1 (en) | Method and device for detecting physical property of object | |
| Alipour et al. | Ventricular pressures in phonating excised larynges | |
| Chan et al. | Vocal fold vibration measurements using laser Doppler vibrometry | |
| Alipour et al. | Measures of spectral slope using an excised larynx model | |
| CN205664930U (en) | Vector hydrophone calbiration system | |
| CN102783973B (en) | Vocal-cord vibration nondestructive measurement method utilizing natural sound track ultraphonic waveguide effect | |
| CN102370485B (en) | Digital automatic acoustic-control otoacoustic immittance detection system and digital signal compensation method thereof | |
| Alipour et al. | Aerodynamic profiles of a hemilarynx with a vocal tract | |
| Nygaard et al. | A new perivascular multi-element pulsed Doppler ultrasound system for in vivo studies of velocity fields and turbulent stresses in large vessels | |
| Andrade et al. | PRESSURE, FLOW AND GLOTTAL AREA WAVEFORM PROFILE CHANGES DURING PHONATION USING THE ACAPELLA CHOICE® DEVICE | |
| CN108652632B (en) | Forced oscillation lung function testing device and method | |
| CN203539352U (en) | Oscillation type respiratory function monitor | |
| JP5896832B2 (en) | Sample information processing apparatus and sample information processing method | |
| Jing et al. | Visualizing the movement of the contact between vocal folds during vibration by using array-based transmission ultrasonic glottography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170606 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |