CN1827040A - Hand-held portable hearing screening apparatus utilized otoacoustic emissions - Google Patents
Hand-held portable hearing screening apparatus utilized otoacoustic emissions Download PDFInfo
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Abstract
There is a handholding portable acoustic emission screening examination appearance, which belongs to medical service appearance field. It contains a micro probe composed of a micro loudspeaker that is used to broadcast stimulation sound, a micro microphone that is used to distill acoustic emission signal and a electronic label that is used to probe information and protect product property through key management; A simulation manipulation part composed of micro loudspeaker volume regulating circuit, signal filtering treating circuit and signal multiple-stage enlargement circuit; A data processing part composed of digital-to-analog conversion circuit that is used to sample the distilled acoustic emission signal, high-speed data processing CMOS chip that is used to engender stimulation sound and control management menu, acoustic data storage, program storage and liquid crystalline display storage, RS232 asynchronous expansion serial port, USB interface, JTAG interface, etc. externally input/output and conjunction interfaces; And a keyboard used to display liquid crystalline display screen and input information. This invention is convenient to use, it has small bulk and is facilitating to take.
Description
Technical field
The present invention relates to a kind of instrument of medical equipment technical field, specifically, what relate to is a kind of hand-held portable hearing screening apparatus utilized otoacoustic emissions.
Background technology
(Otoacoustic emissions OAEs) is a kind of cochlea that results to otoacoustic emission, conducts the audio power that is released into external auditory meatus through ossicular chain and tympanum.1978, Britain scholar Kemp uses short sound as the transient stimulus signal, with earphone/mike coupling probe, record first in people's external auditory meatus acoustic field signal except that the stimulus signal of rapid decay, also have one to postpone several milliseconds of just appearance, continue the above audio signal of millisecond surplus in the of ten, the early stage Kemp echo that Here it is is generally believed, i.e. otoacoustic emission by the generation of initiatively power consumption process of cochlea.The existence of otoacoustic emission is one of effective, sane long-term index of audition peripheral-system function normality.The cochlear function that it can be widely used in deafness patient detects newborn hearing screening, the tracking and monitoring of ototoxic drug side effect, the multiple fields such as hearing impairment monitoring of special occupation (as pilot, diver, demolition man etc.) labor protection.
Mostly domestic Audibility measurement instrument emitting sound to ear is to comprise computer system and control and the process software that carries out the pre-process unit of filtering, processing and amplifying, the signal after pre-process is handled to the miniature probe of the broadcast of stimulation sound and otoacoustic emission signal extraction, to the otoacoustic emission signal that extracts, be provided with in the involved computer system analogue signal after the pre-process is carried out digitized sampling, produce the full-duplex audio card of stimulation sound simultaneously, as shown in Figure 1.This class audition detector all is by the desk computer sound card, with the whole detector of the common formation of desk computer, is fit to the use of large-scale medical spaces such as hospital, and for family or individual using and detecting, it is portable not enough.
Find through literature search prior art, British patent GB205430A has put down in writing a kind of ear acoustic emission auditory capacity detection system, it constitutes as shown in Figure 2, comprise: miniature probe (Speaker, Microphone), signal pre-process unit, data acquisition card, signal processing card and computer system and parts such as control and process software.Wherein, miniature probe is responsible for the broadcast of stimulation sound and the extraction of otoacoustic emission signal.The signal pre-process is responsible for the otoacoustic emission signal that Microphone in the probe extracts is carried out pre-process, comprises links such as filtering, amplification.Data acquisition card is responsible for the analogue signal after the pre-process is carried out digitized sampling, produces stimulation sound simultaneously.Signal processing card is responsible for the otoacoustic emission signal after quantizing is carried out digital processing, comprises filtering, adds up, coherence average, relevant and spectrum analysis etc.Systems soft ware is responsible for the control to whole testing process, finishes functions such as demonstration, printing and medical record management simultaneously.The hardware circuit more complicated of this system, the function of software is less, and it is very not convenient, directly perceived to use.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of hand-held portable hearing screening apparatus utilized otoacoustic emissions is proposed, use high-speed digital signal process chip (DSPs) to finish the broadcast of stimulation sound and the extraction and the processing of otoacoustic emission signal, have characteristics such as real-time height, volume be little, low in energy consumption, powerful, the full menu in Chinese mode based on liquid crystal (LCD) is adopted at the interface, uses more directly perceived.
The present invention is achieved by the following technical solutions, the present invention includes: miniature probe, simulation process part, digital processing part, demonstration output and importation.Miniature probe, simulation process part, demonstration output and importation are connected with the digital processes branch respectively.
Described miniature probe comprises Microspeaker, mini microphone and three parts of electronic tag, Microspeaker is connected with the volume control circuit of simulation process part, mini microphone is connected with the amplifying circuit of simulation process part, and electronic tag is connected with the digital processes branch of rear end.Microspeaker is used for playing the stimulation sound that produces otoacoustic emission, and it converts the electrical signal to acoustical signal; Mini microphone is used for extracting the otoacoustic emission signal, and it converts acoustical signal to the signal of telecommunication; And electronic tag is information such as the performance parameter, location parameter and the calibration parameter that are used for storing mini microphone and speaker and the property right of protecting product by key management.
Described signal imitation processing section comprises that Microspeaker volume control circuit, signal filtering treatment circuit, signal graded amplifying circuit constitute.Microspeaker volume control circuit one end links to each other with Microspeaker, and the other end is connected with the D/A conversion circuit of digital processing part; Mini microphone links to each other with first order amplifying circuit, first order amplifying circuit connects low-pass filter circuit, connecting high-pass filtering circuit afterwards, is thereafter second level amplifying circuit, and second level amplifying circuit partly is connected with the D/A conversion circuit of digital processing part.The Microspeaker volume control circuit is the volume according to probe model and tested people's different adjustment stimulation sound.Finish the reception and the processing of the physiological signal that probe is extracted in the signal filtering treatment circuit, this physiological signal by the pick off conversion is a mixed signal, the otoacoustic emission signal is not only arranged, and contain a large amount of interfering signals.In the signal filtering treatment circuit, high band and low-frequency range to signal are handled respectively, interfering signal beyond the characteristic frequency of filtering otoacoustic emission signal, so that it is further processed, behind the entering signal graded amplifying circuit, signal is amplified to different magnitudes of voltage respectively and is passed through analog/digital conversion again, sends into digital processing and partly analyzes, handles.
Described signal digital processing section comprises the D/A conversion circuit that the otoacoustic emission signal that extracts is sampled, and the asynchronous expansion serial ports of high-speed figure process chip, otoacoustic emission data storage, procedure stores and liquid crystal display memorizer, liquid crystal and backlight controller, RS232 of generation stimulation sound and control and management menu, USB interface, jtag interface etc. are I/O and connecting interface and ingredients such as liquid crystal display and keyboard externally.With the digital processing chip is the center, it connects D/A conversion circuit, otoacoustic emission data storage, program storage, liquid-crystal controller, the asynchronous expansion serial ports of RS232, USB interface and jtag interface, liquid-crystal controller connects the liquid crystal display memorizer, by being connected to the I2C flared joint LCD backlight controller and the keyboard of digital processing chip, the asynchronous expansion serial ports of RS232 connects PC, the other end of liquid-crystal controller and backlight controller links to each other with liquid crystal display, and D/A conversion circuit is regulated with the volume of simulation part and linked to each other with amplifying circuit.Receive the simulation otoacoustic emission signal that simulation process is partly sent here, sample through A/D conversion circuit, form digital signal, finish the processing of digital signal and result be shown on the external liquid crystal display by the high-speed figure process chip, and by Keyboard Control select that stimulation mode, result check, functions such as transfer of data and printing.
Described demonstration output and importation promptly show the LCD display of output usefulness and the keyboard that input information is used.
The present invention can realize that control to whole instrument, the display menu of control section comprise otoacoustic emission measurements, check the result by software, print result, transmission or deletion result, basic setup Pyatyi main menu.The otoacoustic emission measurements menu also comprises the measurement of transient evoked otoacoustic emission (TEOAEs) and two kinds of selections of measurement of distortion product otoacoustic emissions (DPOAEs), and wherein the measurement of distortion product otoacoustic emissions (DPOAEs) also comprises the combination of four kinds of measuring frequencies; Check that menu can be selected to check that patient data, each screen can show six nearest test results by patient's name as a result; The print result menu can be selected to show and print all results, still print certain measurement result by patient's name; The version informations such as serial number, electronic labeling information that comprise setting (measurement that is TEOAEs still is the measurement of DPOAEs), the instrument of the setting of setting, keyboard sound of setting, the display backlight of date, time and form thereof and start back acquiescence metering system in the basic setup menu.
The present invention uses high-speed digital signal process chip (DSPs) and related peripheral circuit thereof, and the hardware circuit of system is greatly simplified.The present invention adopts high-speed dsp s chip, replaced and controlled the computer system required on the traditional structure with signal processing, can finish the used function of duplexing sound card and data acquisition card in the prior art by DSPs chip controls stereo audio codec chip, simultaneously because of its high speed and real-time, more convenient and the simplification to its control, system also has more the characteristic of function modoularization, and its external interface provides the more function expansion.Simulation process partial circuit among the present invention adopts integrated Analogical Electronics chip to finish filtering and amplification, has saved the signal processing card in the prior art simultaneously, and its function is finished by the high speed signal process chip of digital processing part fully.
System of the present invention control, process software use more convenient.On function, the detection of transient evoked otoacoustic emission (TEOAEs) and distortion product otoacoustic emissions (DPOAEs) is not only arranged, and use two pure tones to stimulate as the source sound for the detection of distortion product otoacoustic emissions, can select being combined into to assassinate and swashing of different frequency of two sound simultaneously.
The present invention is easy to use, and is easy to carry.The present invention had both inherited the basic function of original otoacoustic emission instrument based on sound card and computer, and high-speed digital signal process chip also low in energy consumption because of adopting simultaneously, that real-time is high has been dwindled the volume of instrument greatly, makes it be more convenient for carrying and using.The man-machine friendly interface of the present invention, be that doctor or family's user all are easy to grasp fast its using method, by waveform and two kinds of method display result of data, can store repeatedly measurement result simultaneously, be convenient to the doctor patient is carried out secular monitoring and diagnosis.The present invention can set up the medical record management data base, can retrieve by modes such as patient's identification number, name, age, occupation, dates, the relevant information of printout simultaneously, or by various interface the transfer of data on the instrument is kept in the system database of computer or hospital, make things convenient for clinician's diagnosis, research.
Description of drawings
Fig. 1 is that the system of domestic prior art constitutes block diagram.
Fig. 2 is that the system of external prior art constitutes block diagram.
Fig. 3 is that system of the present invention constitutes block diagram.
Fig. 4 is a digital processing part block diagram of the present invention.
Fig. 5 is the Filtering Processing circuit theory diagrams of present embodiment.
Fig. 6 is the amplifier circuit schematic diagram of present embodiment.
Fig. 7 is the stimulation output volume adjusting circuit theory diagrams of present embodiment.
Fig. 8 is the display menu block diagram of present embodiment.
Fig. 9 is the basic procedure block diagram of the otoacoustic emission signal testing of present embodiment.
The specific embodiment
The present invention proposes a kind of ear acoustic emission auditory capacity disease screening instrument embodiment of handheld portable, is made up of hardware circuit and Control-Menu management two large divisions, is described in detail as follows in conjunction with each accompanying drawing:
The hardware circuit of present embodiment is overall to be constituted as shown in Figure 3, comprises a mini microphone and two miniature probes that Microspeaker and electronic tag constituted, acquired signal is carried out the liquid crystal display screen of the simulation process part of filtering and program control amplification, the digital processing part that realizes various signal processing algorithms and display result and the keyboard of information input usefulness.Miniature probe, simulation process part, LCDs are connected with the digital processes branch respectively with keyboard.In the miniature probe, Microspeaker is connected with the volume control circuit of simulation process part, and mini microphone is connected with the amplifying circuit of simulation process part, and electronic tag is connected with the digital processes branch of rear end; In the simulation process part, Microspeaker volume control circuit one end links to each other with Microspeaker, and the other end is connected with the D/A conversion circuit of digital processing part; Mini microphone links to each other with first order amplifying circuit, first order amplifying circuit connects low-pass filter circuit, connecting high-pass filtering circuit afterwards, is thereafter second level amplifying circuit, and second level amplifying circuit partly is connected with the D/A conversion circuit of digital processing part; In the digital processing part, with the digital processing chip is the center, it connects D/A conversion circuit, the otoacoustic emission data storage, program storage, liquid-crystal controller, the asynchronous expansion serial ports of RS232, USB interface and jtag interface, liquid-crystal controller connects the liquid crystal display memorizer, by being connected to the I2C flared joint LCD backlight controller and the keyboard of digital processing chip, the asynchronous expansion serial ports of RS232 connects PC, the other end of liquid-crystal controller and backlight controller links to each other with liquid crystal display, and D/A conversion circuit is regulated with the volume of simulation part and linked to each other with amplifying circuit.
The Filtering Processing circuit of the simulation process of present embodiment part is the band filter that the low pass filter by the high pass filter of 600Hz, 6kHz constitutes.Its circuit theory as shown in Figure 5.Because the passband broad of system requirements, present embodiment adopt 2 amplifier AD822 of two high accuracy, low-power consumption, low noise FET input to form 4 rank Butterworth low pass filters (fc=6kHz) and high pass filter (fc=600Hz) respectively.This is because the phase characteristic of Butterworth filter is than all good with the Chebyshev of exponent number, anti-Chebyshev and elliptic function filter.
The amplifying circuit of the simulation process part of present embodiment is to select according to the characteristics of otoacoustic signal, and its circuit theory as shown in Figure 6.In the amplifying circuit of native system, adopt low noise, low distortion instrument to amplify with the accurate adjustable potentiometer formation first order of amplifier INA163 and 50 Ω, gain can be regulated between 41dB～66dB; Constitute second level amplifying circuit by high accuracy, low noise operational amplifier 0PA2227, gaining is 40dB.
The stimulation output volume adjusting circuit of the simulation process part of present embodiment is owing to size the there are differences property of tester's individuality to the stimulation sound, and TEOAEs and DPOAEs are also different to the requirement that stimulates the loudness of a sound degree, so require to control, regulate in real time as required to the size that stimulates volume.Its circuit theory as shown in Figure 7.Native system is a handheld portable devices, to dimensional requirement than higher, so adopted a stereo volume control chip of high-performance PGA2311 of TI company, it can realize the volume control figureization under the control of DSPs chip TMS320VC5509A, it is little to have volume, and cost is low, tracking accuracy is high, technological performance, flexible configuration and plurality of advantages such as simple to operate.PGA2311 includes two independently voice-grade channels, satisfies the requirement of system to TPOAEs (passage stimulation) and DPOAEs (stimulation of two passages) test.The volume of left and right acoustic channels can be regulated separately, and the volume control range of each sound channel is-95.5dB～+ 31.5dB, every grade of 0.5dB, the master control amount is 127dB.The absolute step-up error of the tracking error between each sound channel and each sound channel all is no more than ± 0.05dB.
The digital processing part of present embodiment is a core with the DSPs chip TMS320VC5509A of American TI Company, comprises data storage, A/D﹠amp; D/A conversion, liquid crystal display and communication etc. are the control and the data processing unit of entire equipment.It implements block diagram as shown in Figure 4.TMS320VC5509A fixed-point dsp (Digital Signal Processor) is based on a dsp chip of TMS320VC55x series CPU processor core.The external 20MHz crystal oscillator of this processor, inner frequency multiplication produces the needed 144MHz clock signal of system.Native system utilizes the external memory interface of TMS320VC 5509A, asynchronous memory SRAM and parallel Flash have been connected, and utilize asynchronous interface to connect parallel LCD controller SED1335, realize that processor is to the control of liquid crystal and the transmission of video data.Simultaneously, utilize the I2C module of TMS320VC5509A, realized controlling being connected of mouth with enlarging chip MAX7311 and audio codec TLV320AIC23 with processor.
The control of the system of present embodiment realizes by software, is the DSP application program with the programming of C Language And Assembly Language, and its display menu comprises otoacoustic emission measurements, checks the result, print result, transmission or deletion result, basic setup Pyatyi main menu.The otoacoustic emission measurements menu comprises that also the transient evoked ear penetrates the measurement of otoacoustic emission (TEOAEs) and two kinds of selections of measurement of distortion product otoacoustic emissions (DPOAEs), and wherein the measurement of DPOAEs also comprises the combination of four kinds of measuring frequencies; Check that menu can be selected to check that patient data, each screen can show six nearest test results by patient's name as a result; The print result menu can be selected to show and print all results, still print certain measurement result by patient's name; The version informations such as serial number, electronic labeling information that comprise setting (TEOAEs measures or DPOAEs measures), the instrument of the setting of setting, keyboard sound of setting, the display backlight of date, time and form thereof and start back acquiescence metering system in the basic setup menu.Its menu block diagram as shown in Figure 8.
The otoacoustic emission signal testing basic flow sheet of present embodiment as shown in Figure 9.Its basic step comprises:
1),, then opens original medical record, and set up new record for the check patient for the new patient sets up medical record;
2) choose the ear (left side or auris dextra) that needs test, connect the in ear probe, and put it in the scope that can keep the ear operate as normal in the auditory meatus, the probe of calibration testing simultaneously;
3) if probe placement is suitable, to 4) begin test, if place improper, to 2) begin 4 after adjusting probe positions) test;
4) require stimulus parameter is set respectively according to the unfamiliar to the ear emission of transient evoked, distortion product otoacoustic emissions, send stimulation sound, according to artificial disturbance and the stable requirement that stimulates, beginning official testing;
5) record otoacoustic emission signal;
6) deposit the otoacoustic emission signal in corresponding data buffer zone, and the real time signal processing of having addressed on carrying out;
7) according to shown information, if the artificial disturbance rate is higher than 20%, stable stimulation does not reach 80%, then provides the information of " wishing to measure once more "; If think that jamming rate is lower than 20%, the stable stimulation minimumly reaches 80%, then provide " by " information;
8) show testing result, storage and management medical record;
9) judge whether to meet the requirements of stimulation number of times or user and whether require to stop test, if then to 10); If not then to 4), test next time;
10) stop test, carry out post processing;
11) EOT.
When present embodiment detects, adopt the realization of following fundamental method of measurement:
Transient evoked otoacoustic emission (TEOAEs) detects:
TEOAEs is the OAEs that brings out with short sound (clicks) or tone burst (tone-bursts).Decay in electric impulse signal finishes 2～4ms by the stimulus signal that sends of Microspeaker in the probe and artefact and to finish, approximately since 5ms second, just can record by cochlea and be transmitted into OAEs in the external auditory meatus through middle ear, therefore also the someone claims that TEOAEs is " postponing OAEs ".Because TEOAEs and stimulus signal and artefact are isolating (but still having lap) in time substantially, thereby the method for available coherence average extracts TEOAEs.
The threshold value of TEOAEs generally is lower than subjective hearing thresholds 5～10dB, and the intensity majority is no more than 20dBSPL.The TEOAEs amplitude almost presents linear growth with the increase of stimulus intensity when hanging down stimulus intensity, average rate of increase is 0.3～0.4dB/dB, and when stimulus intensity reached 40～60dBSPL, TEOAEs intensity no longer is linear with stimulus intensity to be increased, and be tending towards saturated, thereby show nonlinear characteristic.The amplitude of TEOAEs is highly to depend on frequency with the rate of increase of stimulus intensity.The TEOAEs of different frequency its incubation period is different, TEOAEs always high frequency formerly, low frequency after.
The form of the frequency content of TEOAEs and stimulation sound has much relations.Cochlea can carry out linear response to the complex stimulus that two bigger pure tones of frequency difference constitute, when two frequency differences are little, then can produce nonlinear response, the specific frequency of Here it is OAEs, because short sound is different with the frequency composition of tone burst, also is different by two kinds of TEOAEs frequency contents that stimulate acousta inductions to send out.
Stimulate sound intensity that waveform and the amplitude of TEOAEs are also had certain influence, can obtain the wideer frequency range of OAEs during high stimulus intensity, along with the reduction of stimulus intensity, the energy of OAEs focuses on several frequencies near SOAEs more and more narrowly.Therefore, more fully information of cochlea be can obtain, but the intensity and the persistent period of stimulus artifact also correspondingly increased with higher stimulus intensity.
TEOAEs has different reports in the recall rate of healthy people's ear, but can obtain 100% recall rate under suitable stimulation, thereby is to study the earliest and study maximum a kind of OAEs.
Distortion product otoacoustic emissions (DPOAEs) detects:
DPOAEs has the OAEs that certain frequency stimulates cochlea simultaneously and brought out than the initial pure tone f1 and the f2 of relation with two.F1 and f2 can be successive, it also can be pure tone pulse (being generally 100ms) with long delay, thereby DPOAEs and stimulation sound is synergetic in time domain, but both frequencies are isolating in frequency domain, can DPOAEs be extracted with narrow band filter.The existence of DPOAEs has shown that the active mechanisms of cochlea is a kind of nonlinear process.
DPOAEs comprises a plurality of tranmitting frequencies, and such as (2f1-f2), (f2-f1) etc., wherein the most stable with (2f1-f2) occurrence rate, intensity is the highest, also only uses this frequency at present in clinical practice.
The DPOAEs amplitude is generally than the low 60dBSPL of stimulus intensity, but the amplitude of DPOAEs is influenced by several factors, comprises two intensity, frequency, strength difference and frequency ratios etc. that stimulate acoustical signal.Studies show that the value of f2/f1 is can obtain DPOAEs at 1.22～1.25 o'clock (1～4kHz) maximum amplitude then needs bigger frequency ratio (f2/f1=1.26) or stronger relatively stimulation for the DPOAEs of low frequency at intermediate frequency.The stimulus intensity of f1 than the high 10dB of stimulus intensity of f2 or more for a long time, the amplitude maximum of DPOAEs.
Claims (8)
1, a kind of hand-held portable hearing screening apparatus utilized otoacoustic emissions, comprise: miniature probe, simulation process part, digital processing part, demonstration output and importation, it is characterized in that: miniature probe, simulation process part, demonstration output and importation are connected with the digital processes branch respectively, wherein, miniature probe is by the mini microphone of the Microspeaker of playing stimulation sound, otoacoustic emission signal extraction be used for writing down the information of probe and protect the electronic tag of the property right of product to constitute by key management; The simulation process part is made of Microspeaker volume control circuit, signal filtering treatment circuit, signal graded amplifying circuit; The digital processing part is produced high-speed figure process chip, otoacoustic emission data storage, procedure stores and liquid crystal display memorizer, liquid crystal and the backlight controller of stimulation sound and control and management menu, external I/O and connecting interface and is constituted by the D/A conversion circuit that the otoacoustic emission signal that extracts is sampled.
2, hand-held portable hearing screening apparatus utilized otoacoustic emissions according to claim 1 is characterized in that, Microspeaker is used for playing the stimulation sound that produces otoacoustic emission, and it converts the electrical signal to acoustical signal; Mini microphone is used for extracting the otoacoustic emission signal, and it converts acoustical signal to the signal of telecommunication; And electronic tag is performance parameter, location parameter and calibration parameter that is used for storing mini microphone and speaker and the property right of protecting product by key management.
3, according to claim 1 or 2 described hand-held portable hearing screening apparatus utilized otoacoustic emissions, it is characterized in that, in the miniature probe, Microspeaker is connected with the volume control circuit of simulation process part, mini microphone is connected with the amplifying circuit of simulation process part, and electronic tag is connected with the digital processes branch of rear end.
4, hand-held portable hearing screening apparatus utilized otoacoustic emissions according to claim 1, it is characterized in that, in the simulation process part, Microspeaker volume control circuit one end links to each other with Microspeaker, and the other end is connected with the D/A conversion circuit of digital processing part; Mini microphone links to each other with first order amplifying circuit, first order amplifying circuit connects low-pass filter circuit, connecting high-pass filtering circuit afterwards, is thereafter second level amplifying circuit, and second level amplifying circuit partly is connected with the D/A conversion circuit of digital processing part.
According to claim 1 or 4 described hand-held portable hearing screening apparatus utilized otoacoustic emissions, it is characterized in that 5, the Microspeaker volume control circuit is the volume according to probe model and tested people's different adjustment stimulation sound; Finish the reception and the processing of the physiological signal that probe is extracted in the signal filtering treatment circuit, this physiological signal by the pick off conversion is a mixed signal; In the signal filtering treatment circuit, high band and low-frequency range to signal are handled respectively, interfering signal beyond the characteristic frequency of filtering otoacoustic emission signal, so that it is further processed, behind the entering signal graded amplifying circuit, signal is amplified to the correspondent voltage value respectively and is passed through analog/digital conversion again, sends into digital processing and partly analyzes, handles.
6, hand-held portable hearing screening apparatus utilized otoacoustic emissions according to claim 1, it is characterized in that, in the digital processing part, with the digital processing chip is the center, it connects D/A conversion circuit, the otoacoustic emission data storage, program storage, liquid-crystal controller, the asynchronous expansion serial ports of RS232, USB interface and jtag interface, liquid-crystal controller connects the liquid crystal display memorizer, by being connected to the I2C flared joint LCD backlight controller and the keyboard of digital processing chip, the asynchronous expansion serial ports of RS232 connects PC, the other end of liquid-crystal controller and backlight controller links to each other with liquid crystal display, and D/A conversion circuit is regulated with the volume of simulation part and linked to each other with amplifying circuit.
7, according to claim 1 or 6 described hand-held portable hearing screening apparatus utilized otoacoustic emissions, it is characterized in that, digital processes is divided the reception simulation otoacoustic emission signal that simulation process is partly sent here, sample through A/D conversion circuit, form digital signal, finish the processing of digital signal and result be shown on the external liquid crystal display by the high-speed figure process chip, and by Keyboard Control select that stimulation mode, result check, functions such as transfer of data and printing.
8, hand-held portable hearing screening apparatus utilized otoacoustic emissions according to claim 1 is characterized in that, system's control realizes by software, promptly uses the DSP application program of C Language And Assembly Language programming.
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| CNB2006100245023A CN100401981C (en) | 2006-03-09 | 2006-03-09 | Hand-held portable hearing screening apparatus utilized otoacoustic emissions |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103239235A (en) * | 2013-04-25 | 2013-08-14 | 清华大学深圳研究生院 | Multifunctional comprehensive otoacoustic emission detector |
| CN103690174A (en) * | 2013-12-30 | 2014-04-02 | 中国人民解放军总医院 | Portable audiometry and calibration device and audiometry and calibration methods |
| CN104103269A (en) * | 2014-06-30 | 2014-10-15 | 上海科泰信息技术有限公司 | Audio identification electronic tag |
| CN104921734A (en) * | 2015-07-03 | 2015-09-23 | 谢清华 | Newborn hearing screening instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE433709T1 (en) * | 1999-04-29 | 2009-07-15 | Elvir Causevic | HAND-HELD AUDIOMETRIC APPARATUS AND METHOD FOR HEARING TEST |
-
2006
- 2006-03-09 CN CNB2006100245023A patent/CN100401981C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103239235A (en) * | 2013-04-25 | 2013-08-14 | 清华大学深圳研究生院 | Multifunctional comprehensive otoacoustic emission detector |
| CN103690174A (en) * | 2013-12-30 | 2014-04-02 | 中国人民解放军总医院 | Portable audiometry and calibration device and audiometry and calibration methods |
| CN103690174B (en) * | 2013-12-30 | 2015-07-08 | 中国人民解放军总医院 | Portable audiometry and calibration device and audiometry and calibration methods |
| CN104103269A (en) * | 2014-06-30 | 2014-10-15 | 上海科泰信息技术有限公司 | Audio identification electronic tag |
| CN104921734A (en) * | 2015-07-03 | 2015-09-23 | 谢清华 | Newborn hearing screening instrument |
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| CN100401981C (en) | 2008-07-16 |
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