CN105249987B - The application method and device of frequency spectrum mapping auscultation device are moved in heart pulse - Google Patents
The application method and device of frequency spectrum mapping auscultation device are moved in heart pulse Download PDFInfo
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Abstract
The present invention discloses a kind of heart pulse and moves frequency spectrum mapping auscultation device application method and device.Methods described is continuously detected in auscultation head by the transmitting-receiving and rear end geometric inversion of ultrasonic wave to the position of ventricle wall or vascular wall particular detection point, obtains a bounce ripple.Point bounce ripple is mapped to human ear hearing sensitizing range with signal transacting method, electric signal is changed into voice signal using electroacoustic transducer and played.Described device includes flexible auscultation head, processing module and electroacoustic transducer.Wherein flexible auscultation head adjusts bending degree according to the demand of detection position, and the body surface at specific auscultation position is close to using couplant, is responsible for the transmitting and reception, data communication of ultrasonic wave；Processing module is responsible for the parameter setting of whole device, data communication, the inverting of point bounce ripple, signal transacting and man-machine interaction；Electroacoustic transducer is responsible for D/A switch, electro acoustic conversion and sound and played.The device has the advantages that accuracy of detection height and clear sound, suitable for the organ auscultation such as heart arteries and veins, lung and belly.
Description
Technical field
The invention mainly relates to the technical field of auscultation, and in particular to making for frequency spectrum mapping auscultation device is moved in a kind of heart pulse
Use method and apparatus.
Background technology
Internal medicine physical examination is passed through frequently with the detection method such as observation, palpation, auscultation and necessary B ultrasound, electrocardiogram.Wherein, auscultation
It is that the sound of organ activity is amplified by stethoscope, and ambient noise is implemented to block, doctor is according to the characteristic of sound
And its change to diagnose the lesion of related internal organs, it is widely used in the detection of the heart, lung, abdomen.Wherein, heart sound refers to be received by cardiac muscle
Contracting, cardiac valves are closed and blood hits sound caused by vibration caused by ventricle wall, main artery wall etc..Doctor's stethoscope
Heart sound can be directly heard in chest and mixes noise therein, be advantageous to the early detection and treatment in time of disease accordingly, especially
It is the diagnosis such as congenital heart disease, rheumatic heart valve disease.However, there is following deficiency in existing stethoscope in use：
(1) validity of auscultated results depends on stethoscopic proper use of, it is necessary to be selected according to tone height different
Body part, as bell body part is applied to listen to low-key (low frequency) sound, film body part is applied to listen to (high frequency) sound to a high-profile.
(2) sound that intracorporeal organ or histokinesis are formed mixes with one another, the interference for other sound that to forgo during auscultation, such as
The lungs sound that to be forgone when hearing the rhythm of the heart disturbs.
(3) blood impact ventricle wall, main artery wall etc. cause sound caused by vibration to be likely located at 20Hz-20KHz models
Enclose outer, beyond auditory perceptual scope, and the sound outside human ear hearing sensitizing range is not easy to be heard by doctor, can not be by
Distinguish.
Therefore, the diagnostic result that different doctors are drawn by auscultation is not quite similar, or even can produce mistaken diagnosis.
In consideration of it, this patent, which proposes a kind of heart pulse, moves frequency spectrum mapping auscultation device application method and device.This method
The bounce of some determination position of ventricle wall or vascular wall is directly detected, using the transmitting-receiving of ultrasonic wave to ventricle wall or blood vessel
The position of particular detection point is detected and continuous monitoring on wall, obtains the moving wave shape that the test point is formed by bounce, i.e.,
Point bounce ripple.Point bounce ripple is mapped to by signal processing method by human ear hearing sensitizing range, using electroacoustic transducer this
Individual electric signal is changed into voice signal and played back, and auxiliary doctor carries out medical diagnosis on disease.Small, structure is simple with radiating for the device
Single, anti-interference strong, clear sound, it is safe to use the advantages that, can be widely used for the auscultation such as heart, pulse, lung, stomach field.
The content of the invention
Cause to identify the problem of unclear, this hair for the interference of organ activity sound in auscultation and more than human auditory system scope
It is bright to propose a kind of dynamic frequency spectrum mapping auscultation device application method of heart pulse and device, ventricle wall or the selected detection of vascular wall
The bounce ripple of point, which is mapped to the frequency range of human ear hearing sensitizing range and played back, realizes auscultation.
Frequency spectrum mapping auscultation device application method is moved in a kind of heart pulse, and the ultrasonic wave of transceiver is provided with its auscultation head
Linear transducer array, transmitting probe convert electrical signals into ultrasonic signal and launched, in the inspection that ventricle wall or vascular wall are selected
Reflection is produced at measuring point, part back wave is received by neighbouring ultrasonic wave receiving transducer, utilizes follow-up echo analysis and geometry
Inverting can judge to test point position, structure, realize that position is detected.In addition, heart pulse is dynamic to cause test point position therewith
Change, test point can be obtained in position at different moments by the detection of continuous position, and then to test point because position becomes
Change the multi-dimensions test that the bounce ripple formed carries out time and space, obtain a bounce ripple.By entering line frequency to this point bounce ripple
Spectrum analysis, the frequency spectrum of the signal, i.e., each frequency content and frequency distribution scope can be obtained, and obtain each frequency content
Energy.According to the signal sampling theorem of Nyquist, exceed human ear hearing band limits using the transmitting-receiving of ultrasonic wave is detectable
Point bounce ripple signal beyond (20Hz-20KHz).In addition, it can be seen from the contour of equal loudness of human ear, human ear is to 1KHz-4KHz
Between sound it is most sensitive, using frequency spectrum mapping, the frequency spectrum in a bounce wave frequency rate distribution, to be mapped to human ear hearing quick
In the frequency range of sensillary area, obtain mapping sound spectrum, the signal do not heard and do not heard in a vibration wave frequency spectrum can be mapped to
Human ear hearing sensitizing range.Finally, the time domain sequences after being mapped by frequency spectrum inverse transformation, using electroacoustic transducer the signal
It is changed into voice signal and plays back and realizes auscultation.
Frequency spectrum mapping auscultation device application method is moved in a kind of heart pulse, wherein the geometric inversion according to emission sensor,
Receive the position of sensor and the transmission delay of signal carries out inverting to test point position, determine the locus of test point.Often
Individual reception sensor can utilize known transmission signal and the reception signal of oneself to estimate signal transmission delay, if with
The position of sending and receiving sensor is focus, then for test point on an ellipsoid, this ellipsoid is to the two focuses
It is equal to forming a little for transmission delay apart from sum.Each sensor that receives can construct one according to the transmission delay of estimation
Individual ellipsoid, test point are located on these ellipsoids, therefore test point is the intersection point of these ellipsoids.Mathematically pass through performance letter
The position inverting of test point is changed into an optimization problem and solved by several constructions.
Frequency spectrum mapping auscultation device application method is moved in a kind of heart pulse, wherein frequency spectrum mapping is responsible for a bounce ripple
Frequency spectrum is mapped in the frequency range of human ear hearing sensitizing range.According to the signal sampling theorem of Nyquist, ultrasonic wave is utilized
The detectable point bounce ripple signal exceeded beyond human ear hearing band limits (20Hz-20KHz) of transmitting-receiving, and human ear is to 1KHz-
Sound between 4KHz is most sensitive, and this has just corresponded to the mathematics for broadband signal being mapped to human ear hearing sensitizing range and asked
Topic.If different frequency component is mapped one by one according to identical ratio, it is possible to obtain a frequency in human ear hearing sensitizing range
Compose the similar signal of structure.
The specific implementation step that frequency spectrum mapping auscultation device application method is moved in a kind of heart pulse includes：
1) point bounce ripple detection.A test point is selected in ventricle wall or vascular wall, is received using the active of ultrasonic wave
Hair and follow-up echo analysis, geometric inversion detect the position of the point, realize that position is detected；Because the position of the point is with the heart
Pulse is dynamic and changes, the bounce ripple that can be formed by carrying out continuous position detection to test point position to this by change in location
The multi-dimensions test in time and space is carried out, obtains a bounce ripple.
2) pretreatment of point bounce ripple.Including denoising, filtering.
3) spectrum analysis.Spectrum analysis is carried out to the point vibration signal that pretreatment has been carried out, obtains the frequency of the signal
Spectrum.
4) frequency spectrum maps.The frequency spectrum of the signal is mapped to the frequency range of human ear hearing sensitizing range, obtains mapping sound spectrum.
5) time domain is changed.Sound spectrum after mapping is converted into time domain sequences.
6) signal plays.Electroacoustic transducer carries out steering D/A conversion to the data signal of reception, and electric signal is changed into sound
Signal simultaneously plays back.
This patent proposes a kind of heart pulse and moves frequency spectrum mapping auscultation device, including flexible auscultation head, processing module and electricity
Acoustical convertor.Wherein flexible auscultation head is connected with processing module, and processing module is connected with electroacoustic transducer；Flexible auscultation head
The body surface at specific auscultation position is attached to, is responsible for the transmitting and reception, data communication of ultrasonic wave；Processing module is responsible for whole dress
Parameter setting, data communication, the inverting of point vibration wave, signal transacting and the man-machine interaction put；Electroacoustic transducer is responsible for analog change
Change, and convert the electrical signal to acoustical signal, realize the broadcasting of sound.
Frequency spectrum mapping auscultation device is moved in a kind of heart pulse, wherein the ultrasonic wave that the flexible auscultation head includes transceiver is visited
Head array, transmitting processing unit, reception processing unit and communication unit, they are fixed on flexible PCB, are prevented using entrant sound
Water material is packaged, therefore flexible auscultation head can adjust bending degree according to the demand of detection position, be placed on close to heart or blood
It is close to skin on the outside of the skin of tube wall and using couplant.Wherein the array ultrasonic probe of transceiver is visited by multiple ultrasonic waves
Head is arranged by certain way and forms array, and one of probe is responsible for ultrasonic wave transmitting, and other probes are responsible for ultrasonic echo and connect
Receive；The signal received from processing module is amplified according to arrange parameter for transmitting processing unit and D/A conversions, the electricity after conversion
Signal is transformed into ultrasonic signal by transmitting probe and launched；Reception processing unit enters according to arrange parameter to reception signal
Row amplification, A/D conversions and data buffer storage；Communication unit is responsible for data and control information between flexible auscultation head and processing module
Transmit, using wire/wireless communication pattern；
Frequency spectrum mapping auscultation device is moved in a kind of heart pulse, wherein the processing module includes signal generating unit, main control
Device, point bounce ripple inverting unit, signal processing unit, man-machine interactive platform, communication unit and data buffer storage unit.The signal
The generation that generating unit is responsible for wideband detection signal delivers to flexible auscultation head into driving, the signal by communication unit；It is described
Master controller is responsible for the scheduling between different units, to ensure whole system normal operation；The point bounce ripple inverting unit is born
Duty is to producing the test point position of reflection, structure judges, can be to a bounce ripple using the continuous detection to test point position
Carry out the multi-dimensions test in time and space；The function of the signal processing unit include pretreatment, spectrum analysis, frequency spectrum map,
Time domain is changed, and is responsible for carrying out spectrum analysis to this point bounce ripple, the signal spectrum is then mapped to human ear hearing sensitizing range
Frequency range in, obtain map sound spectrum, the sequence that can be played is converted to by frequency domain to time domain；The man-machine interaction
Platform is responsible for man-machine interaction, the output for parameter setting, the input of control command and error message；The communication unit is responsible for
The transmission of data and control information between flexible auscultation head and processing module, wire/wireless communication pattern can be used；The data
Buffer unit is responsible for caching ultrasound echo signal data, control parameter.
Frequency spectrum mapping auscultation device is moved in a kind of heart pulse, wherein the electroacoustic transducer is responsible for entering the data signal of reception
Row steering D/A conversion, and acoustical signal is converted the electrical signal to, realize the broadcasting of sound.
Frequency spectrum mapping auscultation device application method and device are moved in a kind of heart pulse proposed by the invention, have following excellent
Point：
(1) present invention directly detects the point bounce ripple of ventricle wall or some determination position of vascular wall, apparatus structure letter
It is single, be advantageous to improve noise resisting ability and accuracy of detection.
(2) present invention is detectable more than beyond human ear hearing band limits using the transmitting-receiving and rear end inverting of ultrasonic signal
Point bounce ripple, using frequency spectrum mapping bounce ripple a frequency spectrum be mapped in the frequency range of human ear hearing sensitizing range, obtain
Sound spectrum is mapped, is advantageous to improve the sensitiveness of auscultation, reduces misdiagnosis rate.
(3) present invention has the advantages that simple in construction, easy to operate, safe to use, suitable for heart arteries and veins, lung and belly
Auscultation is carried out Deng organ.
Brief description of the drawings
Fig. 1 is the structured flowchart of apparatus of the present invention；
Fig. 2 is the flexible auscultation head shape assumption diagram of the present invention；
Fig. 3 is the structured flowchart of signal processing unit of the present invention；
Fig. 4 is the geometric inversion schematic diagram of test point position of the present invention；
Fig. 5 is that the mapping of frequency spectrum to the sound spectrum of present invention point bounce ripple is illustrated；
Fig. 6 is the workflow diagram that mapping auscultation device application method is moved in heart pulse of the present invention.
Embodiment
With reference to embodiment and accompanying drawing the present invention is described in further detail explanation, but embodiments of the present invention
Not limited to this.
Embodiment
Fig. 1 is the structured flowchart of apparatus of the present invention, and frequency spectrum mapping auscultation device is moved in a kind of heart pulse proposed by the present invention, its
Structure includes flexible auscultation head, processing module and electroacoustic transducer.Wherein flexible auscultation head is connected with processing module, handles mould
Block is connected with electroacoustic transducer；Flexible auscultation head attached to the body surface at specific auscultation position, be responsible for ultrasonic wave transmitting and
Receive, data communication；Processing module be responsible for the parameter setting of whole device, data communication, point vibration wave inverting, signal transacting and
Man-machine interaction；Electroacoustic transducer is responsible for analog conversion, and converts the electrical signal to acoustical signal, realizes the broadcasting of sound.
The flexible auscultation head that a kind of heart pulse is moved in frequency spectrum mapping auscultation device embodiment includes the ultrasonic wave of transceiver
Linear transducer array, transmitting processing unit, reception processing unit and communication unit, they are fixed on flexible PCB, using entrant sound
Waterproof material is packaged, therefore flexible auscultation head can adjust bending degree according to the demand of detection position, be placed on close to heart or
It is close to skin on the outside of the skin of vascular wall and using couplant, the shape assumption diagram of flexible auscultation head is as shown in Figure 2.Wherein, receive
The array ultrasonic probe of hair one is arranged by certain way by multiple ultrasonic probes and forms array, wherein middle transmitting
Probe 201 is responsible for ultrasonic wave transmitting, and the receiving transducer 202 of surrounding is responsible for ultrasonic echo reception；Launch processing unit according to setting
Parameter is amplified to the signal received from processing module and D/A conversions, the electric signal after conversion are transformed into by transmitting probe
Ultrasonic signal is simultaneously launched；Reception processing unit is amplified according to arrange parameter to reception signal, A/D conversions and data are delayed
Deposit；Communication unit is responsible for the transmission of data and control information between flexible auscultation head and processing module, using wire/wireless communication
Pattern.
The processing module that a kind of heart pulse is moved in frequency spectrum mapping auscultation device embodiment includes signal generating unit, main control
Device, point bounce ripple inverting unit, signal processing unit, man-machine interactive platform, communication unit and data buffer storage unit.The signal
Generating unit is responsible for the generation and driving of wideband detection signal, and the signal delivers to flexible auscultation head by communication unit；The master
Controller is responsible for the scheduling between different units, to ensure whole system normal operation；The point bounce ripple inverting unit is responsible for
Using geometric inversion to produce reflection test point position, structure judge, can using the continuous detection to test point position
The multi-dimensions test in time and space is carried out to a bounce ripple；The structured flowchart of the signal processing unit is as shown in figure 3, specific work(
Pretreatment, spectrum analysis, frequency spectrum mapping, time domain conversion can be included, wherein signal processing unit is responsible for entering this point bounce ripple
Row pretreatment, including denoising and filtering, spectrum analysis is then carried out, and application frequency spectrum maps and the signal spectrum is mapped to human ear
The frequency range 1KHz-4KHz of hearing sensitizing range, obtain mapping sound spectrum, be converted to what can be played by frequency domain to real domain
Sequence；The man-machine interactive platform is responsible for man-machine interaction, for the defeated of parameter setting, the input of control command and error message
Go out；The communication unit is responsible for the transmission of data and control information between flexible auscultation head and processing module, can use wired/nothing
Line communication pattern；The data buffer storage unit is responsible for caching ultrasound echo signal data, control parameter.
A kind of heart pulse moves electroacoustic transducer in frequency spectrum mapping auscultation device embodiment and is responsible for entering the data signal of reception
Row steering D/A conversion, and acoustical signal is converted the electrical signal to, realize the broadcasting of sound.
As shown in figure 4, it is the geometric inversion schematic diagram of test point position of the present invention.
Space coordinates corresponding to known emission sensor S, i.e.,：S(us,vs,ws).It is assumed that test point O space coordinates is
(x, y, z), the coordinate for receiving sensor i is can determine that according to the locus of the relative position of sending and receiving sensor and emission sensor
Ri(uri,vri,wri), (i=1 ..., Nr), Nr is the quantity for receiving sensor.According to wideband detection signal and receive sensor
RiEcho-signal can estimate from emission sensor S to target O and from target O to receiving sensor RiPropagation delay time li(i=
1 ..., Nr), as illustrated, li=SO+ORi.It can be seen that if with S and RiFor focus, target O be located to the two focuses away from
From with for liEllipsoid on, i.e.,：
(formula 1)
Different sensors can estimate the transmission delay l of signal according to transmission signal and the echo-signal receivedi(i=
1 ..., Nr), target O is with S and RiOn multiple similar ellipsoids of focus, i.e., the intersection point of multiple ellipsoids, to pass through definition
The problem of finding intersection can be converted into optimization problem by performance function：
Definition receives array element RiThe performance function at place
(formula 2)
It can be seen that target O (x, y, z) range transmission sensor S and reception sensor RiApart from sum be li, therefore detecting
Sensor R at targetiPerformance function φiValue be 0.Difference receives sensor RiCoordinate it is different, they and emission sensor group
Into multiple similar ellipsoids.Detecting target should be on all ellipsoid, therefore detection target can only be in the friendship of all ellipsoids
On point, it is all 0 to detect and array element performance function value is respectively received at target, therefore overall performance functionTherefore, mesh is detected
Mark make it that overall performance functional value is minimum, is converted into seeking overall performance functional minimum value problem the problem of object inversion, i.e.,：Min φ,
It can be solved with optimum theory.
Space where target is divided into several sub-spaces, the intermediate point per sub-spaces falls in the subspace as target
Iteration initial value.Each initial value is substituted into overall performance function, the point for making functional value optimal is nearest from target, using it as target
O iteration initial value (x0,y0,z0)。
Extreme point is asked using steepest Descent iteration method.
(formula 3)
Wherein, μ is the step-length of iteration.
The coordinate of the front and rear detection target of iteration is designated as (x respectively(k),y(k),z(k)), (x(k+1),y(k+1),z(k+1)), when the two
Distance it is sufficiently small when, it is believed that have found extreme point.I.e.：WhenIteration terminates, and inverting target is (x(k +1),y(k+1),z(k+1)), the as locus of test point.
It is the processing procedure schematic diagram of present invention point bounce wave frequency spectrum mapping as shown in Fig. 5 (a).
The multi-dimensions test in time and space can be carried out to ripple of being beated at test point by the continuous detection to test point position,
Obtain a bounce ripple.Frequency spectrum X (e in signal processing unit by pre-processing with point bounce ripple being obtained after spectrum analysisj ω), the point bounce ripple signal exceeded beyond human ear hearing band limits (20Hz-20KHz) is can detect using the transmitting-receiving of ultrasonic wave,
Assuming that the frequency range of the signal is fm~fn, the frequency range exceeds human ear earshot, and part signal also falls sensitive in human ear hearing
Beyond area, a frequency spectrum for bounce ripple is mapped in the frequency range 1KHz-4KHz of human ear hearing sensitizing range, obtains mapping sound
Spectrum.
It is the simple case that a frequency spectrum for bounce ripple is mapped in the frequency range of human ear hearing sensitizing range as shown in Fig. 5 (b), this
In frequency spectrum mapping choose the mapping of simple ratio.The spectral range of postulated point bounce ripple is fm~fn, to be mapped to human ear hearing
The spectral range of sensitizing range is fm'~fn', according to a certain frequency f (f of this mapping rule, then point bounce wave frequency spectral limitm≤
f≤fn) frequency that is mapped on the frequency spectrum of human ear hearing sensitizing range is
(formula 4)
As shown in fig. 6, it is the workflow diagram that mapping auscultation device application method is moved in heart pulse.
1) device parameter is set, and the parameter of setting includes：Test point position, wideband detection signal parameter, point bounce ripple are anti-
Drill cell parameters, spectrum analysis parameter, frequency spectrum mapping parameters, time-frequency convert parameter, communication unit parameter and play parameter etc..
2) automatic detection of equipment state, the state that the step is detected include：The company of linear transducer array in flexible auscultation head
Connect the connection status of the connection status of state, flexible auscultation head and processing module, processing module and earphone, the connection of communication unit
With presence, the power supply capacity state of flexible auscultation head.
3) generation of wideband detection signal, the wideband detection of the signal generating unit of processing module according to set by step 1
Signal parameter produces wideband detection signal.
4) ultrasonic wave is launched, and the communication module of flexible auscultation head is responsible for wideband detection signal caused by receiving processing module,
This reception signal is amplified in processing unit is launched to be changed with D/A, is converted into ultrasonic wave by transmitting probe and is launched
Go out；
5) ultrasonic echo receives, and the ultrasonic wave of transmitting, which runs into produce after ventricle wall or vascular wall, reflects to form ultrasonic echo,
Part ultrasonic echo is received by neighbouring ultrasonic probe, and the echo-signal of reception is reception processing unit is amplified, A/D turns
Data buffer storage unit is stored in after changing, and processing module is sent to by communication module；
6) geometric inversion of point bounce ripple, the inspection that echo analysis and geometry principle are selected to ventricle wall and vascular wall is taken
Point position and its change carry out the time domain inversion in time and space, obtain a time domain sequences x [n] for bounce ripple；
7) processing unit carries out signal transacting to a vibration wave time domain sequences x [n]：
A) pre-process：A vibration wave time domain sequences is pre-processed.Pretreatment includes denoising and filtering.
B) spectrum analysis：Fourier transformation is carried out to the time domain sequences that pretreatment has been carried out and obtains frequency spectrum X (ejω)。
C) frequency spectrum maps：Frequency spectrum in the range of frequency distribution is mapped to the frequency range 1KHz- of human ear hearing sensitizing range
4KHz, obtain mapping frequency spectrum X'(ejω)。
8) time domain is changed, and sequence x ' [n] is obtained by inverse fourier transform.
9) signal plays, and electroacoustic transducer carries out steering D/A conversion to the data signal of reception, using loudspeaker electric signal
It is changed into voice signal and plays back.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included in protection scope of the present invention.
Claims (4)
1. frequency spectrum mapping auscultation method is moved in a kind of heart pulse, it is characterized in that directly detection ventricle wall or vascular wall some determination
The bounce of position, i.e., it is special to ventricle wall or vascular wall by the transmitting-receiving of ultrasonic wave and echo analysis, geometric inversion in auscultation head
The position of regular inspection measuring point is detected and continuous monitoring, the point bounce ripple that the test point is formed by bounce is obtained, using signal
Processing method zooms in and out the frequency spectrum of point bounce ripple and is mapped to human ear hearing sensitizing range, using electroacoustic transducer this
Electric signal is changed into voice signal and played back.
2. frequency spectrum mapping auscultation method is moved in heart pulse according to claim 1, specific implementation step includes：
1) device parameter is set, and the parameter of setting includes：Test point position, wideband detection signal parameter, point bounce ripple inverting list
First parameter, spectrum analysis parameter, frequency spectrum mapping parameters, time-frequency convert parameter, communication unit parameter and sound spectrum play parameter；
2) automatic detection of equipment state, the state that the step is detected include：The connection shape of linear transducer array in flexible auscultation head
The connection status of the connection status of state, flexible auscultation head and processing module, processing module and earphone, the connection of communication unit with
Wire state, the power supply capacity state of flexible auscultation head；
3) generation of wideband detection signal, the wideband detection signal of the signal generating unit of processing module according to set by step 1
Parameter produces wideband detection signal；
4) ultrasonic wave is launched, and the communication module of flexible auscultation head is responsible for wideband detection signal caused by receiving processing module, this
Reception signal is amplified in processing unit is launched to be changed with D/A, is converted into ultrasonic wave by transmitting probe and is launched；
5) ultrasonic echo receives, and the ultrasonic wave of transmitting, which runs into produce after ventricle wall or vascular wall, reflects to form ultrasonic echo, part
Ultrasonic echo is received by neighbouring ultrasonic probe, and the echo-signal of reception is amplified, after A/D conversions in reception processing unit
Data buffer storage unit is stored in, and processing module is sent to by communication module；
6) geometric inversion of point bounce ripple, the test point that echo analysis and geometry principle are selected to ventricle wall and vascular wall is taken
Position and its change carry out the time domain inversion in time and space, obtain a time domain sequences for bounce ripple；
7) processing unit is to a bounce ripple time domain sequencesCarry out signal transacting：
A) pre-process：A bounce ripple time domain sequences is pre-processed, pretreatment includes denoising and filtering；
B) spectrum analysis：Fourier transformation is carried out to the time domain sequences that pretreatment has been carried out and obtains frequency spectrum；
C) frequency spectrum maps：A frequency spectrum of bounce ripple is mapped to the frequency range 1KHz -4KHz of human ear hearing sensitizing range, obtained
Map sound spectrum；
8) time domain is changed, and sequence is obtained by inverse fourier transform；
9) signal plays, and electroacoustic transducer carries out steering D/A conversion to the data signal of reception, and electric signal is changed into voice signal
And play back.
3. frequency spectrum mapping auscultation device is moved in a kind of heart pulse, it is characterized in that being changed including flexible auscultation head, processing module and electroacoustic
Device；Wherein flexible auscultation head is connected with processing module, and processing module is connected with electroacoustic transducer；Flexible auscultation head is attached to
The body surface at specific auscultation position, it is responsible for the transmitting and reception, data communication of ultrasonic wave；Processing module is responsible for the parameter of whole device
Set, data communicate, put the inverting of bounce ripple, signal transacting and man-machine interaction；Earphone is responsible for analog conversion, and electric signal is turned
Change acoustical signal into, realize the broadcasting of sound.
4. frequency spectrum mapping auscultation device is moved in a kind of heart pulse according to claim 3, it is characterized in that the flexible auscultation head
Array ultrasonic probe including transceiver, transmitting processing unit, reception processing unit and communication unit, they are fixed on soft
Property circuit board on, and be packaged using entrant sound waterproof material, be placed on close on the outside of the skin of heart or vascular wall and utilizing
Couplant can be close to skin；Wherein the array ultrasonic probe of transceiver is arranged simultaneously by multiple ultrasonic probes by certain way
Array is formed, one of probe is responsible for ultrasonic wave transmitting, and other probes are responsible for ultrasonic echo and received.
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