CN111513725B - Method and system for analyzing middle ear acoustic immittance by using input electrical impedance parameters - Google Patents
Method and system for analyzing middle ear acoustic immittance by using input electrical impedance parameters Download PDFInfo
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- CN111513725B CN111513725B CN202010249306.6A CN202010249306A CN111513725B CN 111513725 B CN111513725 B CN 111513725B CN 202010249306 A CN202010249306 A CN 202010249306A CN 111513725 B CN111513725 B CN 111513725B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/12—Audiometering
- A61B5/121—Audiometering evaluating hearing capacity
- A61B5/125—Audiometering evaluating hearing capacity objective methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/12—Audiometering
- A61B5/121—Audiometering evaluating hearing capacity
- A61B5/125—Audiometering evaluating hearing capacity objective methods
- A61B5/126—Audiometering evaluating hearing capacity objective methods measuring compliance or mechanical impedance of the tympanic membrane
Abstract
The invention discloses a method for analyzing middle ear acoustic immittance by using input electrical impedance parameters, which calculates the middle ear acoustic immittance by measuring the electrical impedance of a receiver, and comprises the following steps: applying pressure to the ear canal of the subject within a predetermined ear canal pressure range; sending out a sound pressure signal with determined frequency range and amplitude in the auditory canal of the subject through a receiver; measuring the input electrical impedance of the telephone receiver based on a pre-established telephone receiver detection circuit; according to the input electrical impedance of the receiver, based on a pre-established acoustic immittance calculation model, obtaining the middle ear acoustic immittance under the pressure value; and traversing the ear canal pressure range, repeating the steps, and outputting a set of pressure values applied to the ear canal of the subject and a corresponding set of middle ear acoustic immittance. The invention utilizes the electrical impedance parameters of the receiver to calculate and measure the middle ear acoustic immittance, so that the middle ear acoustic immittance measurement and analysis device does not depend on the built-in microphone of the auditory canal, and is simpler and more convenient.
Description
Technical Field
The invention relates to the field of middle ear acoustic immittance audiometry, in particular to a method and a system for analyzing middle ear acoustic immittance by using input electrical impedance parameters.
Background
The acoustic immittance test is a medical test instrument, tests the transmission state of sound energy in human ears, can be used as a means for testing the function of sound conduction paths at middle ear parts, and can be used for detecting the state of eardrums, the conduction of ossicular chains, the function of eustachian tubes, the function debugging of auditory implant equipment, the testing of stapedius muscle reflex threshold and the like. After the sound wave reaches the external auditory canal as a form of force, a certain sound pressure acts on the tympanic membrane, the middle ear system and the inner ear correspondingly move, and in the process, the reflection coefficient of the sound pressure in the external auditory canal can be calculated and measured through the input and output of sound energy flow, so that the acoustic immittance of the middle ear is calculated. As an objective diagnosis method, the significance of the acoustic immittance test in clinical otology and hearing department diagnosis is acknowledged by clinicians, and the acoustic immittance test becomes one of the necessary detection devices of modern otorhinolaryngology department.
Although middle ear acoustic immittance audiometry cannot provide the hearing threshold of a patient, and the operation is complicated, the importance of the middle ear acoustic immittance audiometry is often underestimated and is often only used for tympanogram and vocal-smooth value tests. Clinically, hearing professionals often prefer to rely on differences in qi and bone conductance to determine the degree and type of hearing loss. However, because the calibration platform of the gas-bone conduction device cannot completely simulate the difference between real human features and healthy hearing individuals, and the like, the subjective gas conduction hearing threshold test and the bone conduction hearing threshold test cannot completely represent the conduction difference of the gas-bone conduction. Many healthy hearing individuals will have more than a 15dB difference in air-bone conductance threshold and if the middle ear function of these individuals is tested by middle ear acoustic immittance audiometry, they will not have any conductivity impairment. The middle ear acoustic immittance test, an objective test method, is often more reliable than the subjective hearing threshold test and serves as a mutual corroboration in combination with some other testing means. And the middle ear acoustic immittance audiometry does not need a subject to give active feedback, so the method is often used for the hearing detection of infants.
The existing acoustic immittance test instrument basically comprises the following modules, namely a pressure pump system, a microphone, a receiver and a signal processing and calculating module. The pressure pump system is used to apply a variably adjustable pressure to the ear canal, which pressure acts on the ear canal to change the acoustic impedance of the middle ear. The microphone is used for picking up sound pressure signals in an ear canal, the receiver is used for generating sound radiation signals with specific frequency and amplitude, and the signal processing module calculates sound immittance. If some modules can be reduced, the acoustic immittance tester is lighter, and the acoustic immittance tester is developed towards miniaturization, simplification and lightness. Based on the method, the microphone module is removed, and the acoustic immittance is calculated by adopting a method of online measurement of the receiver input electrical impedance parameters. Because the input electrical impedance of the receiver can be obtained by calculating the input current and voltage signals, the input electrical impedance of the receiver can be measured without adding an additional sensor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a system for analyzing the acoustic immittance of the middle ear by using input electrical impedance parameters.
In order to achieve the above object, the present invention provides a method for analyzing middle ear acoustic immittance using an input electrical impedance parameter, the method for calculating the middle ear acoustic immittance by measuring an electrical impedance of a receiver, the method comprising:
step 1) applying pressure to the ear canal of the subject within a predetermined ear canal pressure range;
step 2) sending a sound pressure signal with determined frequency range and amplitude to the auditory canal of the subject through a receiver;
step 3) measuring the input electrical impedance of the telephone receiver based on a pre-established telephone receiver detection circuit;
step 4) obtaining the middle ear acoustic immittance under the pressure value based on a pre-established acoustic immittance calculation model according to the input electrical impedance of the receiver;
and 5) traversing the auditory canal pressure range, and repeating the steps 1) to 4), and outputting a pressure value set applied to the auditory canal of the subject and a corresponding middle ear acoustic immittance set.
As an improvement of the method, the receiver detection circuit is a circuit formed by connecting a power supply, a resistor and a receiver in series.
As an improvement of the above method, the step 3) specifically includes:
measuring resistance and input voltage V of receiver1；
Measuring input voltage V of receiver2；
Calculating the input electrical impedance Z of the receiver:
Z＝Rr·V2/(V2-V1)；
wherein the resistance value of the resistor is Rr。
As an improvement of the method, the acoustic immittance calculation model is an electric power acoustic analogy model, the input of the model is the electrical impedance of a receiver and the structural parameters of an ear canal, the output is the middle ear acoustic immittance, and the structure of the model is an electric power acoustic analogy circuit combined based on an earphone structure, an earphone transduction principle and an earphone, the ear canal and a middle ear coupling structure.
As an improvement of the method, the acoustic immittance calculation model is an electrical impedance and middle ear acoustic immittance correlation model, the input of the model is the electrical impedance of a receiver, the output of the model is the middle ear acoustic immittance, and the structure of the model is a correlation model based on an electrical impedance and middle ear acoustic immittance mapping database.
As an improvement of the above method, the step of establishing the correlation model between the electrical impedance and the middle ear acoustic immittance specifically includes:
applying pressure to the individual subject's ear canal;
emitting sound pressure with determined frequency range and amplitude in the auditory canal of the subject through a receiver;
measuring the input electrical impedance of the telephone receiver based on a pre-established telephone receiver detection circuit;
calculating the acoustic impedance of the middle ear under the pressure through the output sound pressure of the receiver received by the microphone and the sound pressure reflected in the ear canal;
traversing the ear canal pressure range, repeating the steps, establishing a corresponding relation between the input electrical impedance of the receiver under different pressure values and the corresponding middle ear acoustic immittance, and storing the corresponding relation into the type of the receiver in the electrical impedance and middle ear acoustic immittance mapping database;
and establishing an electrical impedance and middle ear acoustic immittance correlation model based on the electrical impedance and middle ear acoustic immittance mapping database.
As an improvement of the method, the acoustic immittance calculation model is a combined model based on an electric power sound analogy model and an electric impedance and middle ear acoustic immittance correlation model, the input of the model is the electric impedance and the ear canal structure parameters of the receiver, the output of the model is the middle ear acoustic immittance, and the structure of the model is the combined model based on the electric power sound analogy model and the electric impedance and middle ear acoustic immittance correlation model.
As an improvement of the above method, the step 4) specifically includes:
if the acoustic immittance calculation model is the electric power acoustic class ratio model, measuring the auditory canal of the subject to obtain auditory canal structure parameters, and matching in the electric power acoustic class ratio model according to the input impedance of the receiver and the auditory canal structure parameters to obtain corresponding middle ear acoustic immittance so as to obtain the middle ear acoustic immittance under the pressure value;
if the acoustic immittance calculation model is an electrical impedance and middle ear acoustic immittance correlation model, matching in the electrical impedance and middle ear acoustic immittance correlation model according to the input electrical impedance of the receiver to obtain a corresponding middle ear acoustic immittance, thereby obtaining the middle ear acoustic immittance under the pressure value;
if the acoustic immittance calculation model is a combined model based on the electric power acoustic analogy model and the electrical impedance and middle ear acoustic immittance correlation model, measuring the ear canal of the subject to obtain the ear canal structural parameters, and matching in the combined model based on the electric power acoustic analogy model and the electrical impedance and middle ear acoustic immittance correlation model according to the input impedance of the receiver and the ear canal structural parameters to obtain the corresponding middle ear acoustic immittance, thereby obtaining the middle ear acoustic immittance under the pressure value.
The invention also proposes a system for analyzing the acoustic immittance of the middle ear using input electrical impedance parameters, said system comprising: the system comprises a pressure module, a receiver impedance testing module, an acoustic immittance output module and an acoustic immittance calculation model;
the pressure module; for applying pressure to the ear canal of the subject within a predetermined ear canal pressure range;
the receiver is used for sending out a sound pressure signal with determined frequency range and amplitude to the ear canal of the subject;
the receiver impedance testing module is used for the receiver detection circuit to measure the input impedance of the receiver;
the acoustic immittance output module is used for obtaining the middle ear acoustic immittance under the pressure value based on an acoustic immittance calculation model according to the input electrical impedance of the receiver;
the acoustic immittance calculation model is as follows: the electric power sound analogy model, the electric impedance and middle ear sound immittance correlation model or the combined model based on the electric power sound analogy model and the electric impedance and middle ear sound immittance correlation model.
Compared with the prior art, the invention has the advantages that:
1. the invention utilizes the electrical impedance parameter of the receiver to calculate and measure the middle ear acoustic immittance, so that the middle ear acoustic immittance measurement and analysis device does not rely on the built-in microphone of the auditory canal, and the middle ear analysis device is simpler and more convenient;
2. the invention can make the existing middle ear acoustic immittance analysis equipment simpler and more convenient, and can be used together with other hearing equipment to carry out the work of hearing diagnosis or hearing equipment debugging.
Drawings
FIG. 1 is a schematic diagram of an input electrical impedance measurement circuit of a receiver;
FIG. 2 is a flowchart of an architecture for middle ear function analysis based on a power acoustic class model according to embodiment 1;
FIG. 3 is a flow chart of an architecture for middle ear functional analysis based on an electrical impedance and middle ear acoustic immittance correlation model in example 2;
FIG. 4 is a flow chart of the method for establishing a database of electrical impedance and middle ear acoustic immittance mappings according to example 2;
FIG. 5 is a flowchart of the combined model architecture of embodiment 3 based on the electro-acoustic analogy model and the correlation model of electrical impedance and middle ear acoustic immittance.
Detailed Description
The invention provides a method for testing middle ear acoustic immittance based on receiver input electrical impedance online measurement. The measurement method avoids the use of a microphone and an associated computation processing circuit module.
The method comprises the following steps:
applying pressure within the ear canal of the subject;
sending out a sound pressure signal with determined frequency range and amplitude in the auditory canal of the subject through a receiver;
measuring the input impedance of the telephone receiver on line based on the telephone receiver detection circuit;
calculating the middle ear acoustic immittance under the pressure condition according to the input electrical impedance of the receiver;
traversing the determined pressure conditions in the auditory canal, adjusting the pressure applied to the auditory canal of the subject, and repeating the steps;
obtaining a set of pressure values applied to the ear canal of the subject and a corresponding set of middle ear acoustic immittances;
and analyzing the middle ear function of the testee by the tester according to the pressure value set and the corresponding middle ear acoustic immittance set.
Wherein, the method of online measurement by using electric impedance is realized by detecting the input voltage and the input current of the receiverTo be implemented. The applied pressure is different and the corresponding input electrical impedance is different. The input electrical impedance measurement schematic diagram of the receiver is shown in fig. 1. The diagram shows the power supply and the impedance of the power supply in the dashed box, by means of a resistor R connected in series between the power supply and the receiverrMeasuring the resistance RrThe voltage at two ends can obtain the input current of the receiver, and then the input voltage V of the receiver is measured2And dividing the input voltage of the receiver by the input current of the receiver to obtain the input impedance Z of the receiver:
Z＝Rr·V2/(V2-V1)
the step of calculating the middle ear acoustic immittance by the input electrical impedance can be realized by adopting one of the following methods:
the method comprises the following steps: the middle ear acoustic immittance is obtained by measuring the ear canal structure parameters and the input electrical impedance of the testee through the electric power acoustic analog model structure of the receiver. Wherein, the ear canal structure parameters can be measured and calculated by a depth camera or other sensors.
The method 2 comprises the following steps: deep learning training is carried out through an actually measured database, a correlation model of the input electrical impedance and the middle ear acoustic immittance is established, and the measured acoustic immittance can be calculated through measuring the electrical impedance based on the correlation model.
The method 3 comprises the following steps: through a combined model of the power acoustic class ratio model, the electrical impedance and the middle ear acoustic immittance correlation model, the measured acoustic immittance can be calculated through measuring the electrical impedance based on the combined model.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 2, a flow chart of the acoustic immittance measurement method shown in this embodiment is illustrated. The pressure in the ear canal of the human ear is regulated and monitored in real time through the pressure pump, and the pressure value is output to the middle ear function analysis module. The receiver applies sound pressure of certain frequencies to the human ear, and a detection circuit of the receiver calculates the input electrical impedance on line. And establishing a power acoustic analog model for a power acoustic transduction mechanism in the receiver. And deducing and calculating the current middle ear acoustic immittance by combining the electric power acoustic class ratio model, the ear canal structure parameters and the electrical impedance online measurement value. And the middle ear acoustic immittance value and the corresponding pressure value in the ear canal are combined to judge the function of the middle ear.
Step 1): applying pressure to the auditory canal by a pressure pump;
step 2): sending sound pressure with a certain frequency range and amplitude to the ear canal of a human ear through a receiver;
step 3): measuring the input impedance of the telephone receiver based on the telephone receiver detection circuit;
step 4): obtaining middle ear acoustic immittance through an electrical impedance measurement value based on the receiver power acoustic analog model and the ear canal structure size parameter;
step 5): adjusting the pressure in the auditory canal through a pressure pump, and repeating the steps 1) to 4) until the auditory canal pressure condition needing to be applied is specified.
Step 6): the middle ear function is analyzed based on a set of pressure values applied within the ear canal and a corresponding set of middle ear acoustic immittances.
Example 2
Referring to fig. 3, a flow chart of the acoustic immittance measurement method shown in this embodiment is illustrated. The pressure in the ear canal of the human ear is regulated and monitored in real time through the pressure pump, and the pressure value is output to the middle ear function analysis module. The receiver applies sound pressure of certain frequencies to the human ear, and a detection circuit of the receiver calculates the input electrical impedance on line. And establishing an electrical impedance and acoustic immittance correlation model based on the electrical impedance and the corresponding middle ear acoustic immittance measurement database. And deducing and calculating the middle ear acoustic immittance according to the online measured value of the electrical impedance based on the electrical impedance acoustic immittance correlation model. And (4) judging the function of the middle ear jointly according to the acoustic immittance value of the middle ear and the corresponding pressure value in the ear canal.
Step 1): establishing an electrical impedance and acoustic immittance correlation model through deep learning or other methods based on an electrical impedance and corresponding middle ear acoustic immittance measurement database;
step 2): applying pressure to the auditory canal by a pressure pump;
step 3): sending sound pressure with a certain frequency range and amplitude to the ear canal of a human ear through a receiver;
step 4): measuring the input impedance of the telephone receiver based on the telephone receiver detection circuit;
step 5): obtaining the middle ear acoustic immittance through an electrical impedance measurement value based on the electrical impedance and acoustic immittance correlation model;
step 6): and adjusting the pressure in the auditory canal through the pressure pump, and repeating the steps 2 to 5 until the auditory canal pressure condition needing to be applied is specified and traversed.
Step 7): the middle ear function is analyzed based on a set of pressure values applied within the ear canal and a corresponding set of middle ear acoustic immittances.
An example of the procedure for establishing the database of electrical impedance and corresponding middle ear acoustic immittance is shown in fig. 4. The method for detecting the sound reflected by the auditory canal by using the microphone measures the acoustic immittance measured value of the middle ear, and simultaneously measures the input electrical impedance by acquiring the input current and the input voltage signal of the receiver on line. During testing, the middle ear acoustic immittance of a real person under different pressure applying conditions is adjusted in a mode of enabling the real person to swallow saliva through a pressure pump system, and a database of the measured electrical impedance of a receiver of a certain model and the corresponding middle ear acoustic immittance is established. And carrying out a large number of human tests to form a comprehensive middle ear acoustic immittance database.
Example 3
Referring to fig. 5, a flow chart of the acoustic immittance measurement method shown in this embodiment is illustrated. And carrying out joint calculation or partial joint calculation on the electric power acoustic class ratio model, the electrical impedance and the middle ear acoustic immittance correlation model to obtain the acoustic immittance.
Step 1): establishing an electrical impedance and acoustic immittance correlation model through deep learning or other methods based on an electrical impedance and corresponding middle ear acoustic immittance measurement database;
step 2): applying pressure to the auditory canal by a pressure pump;
step 3): sending sound pressure with a certain frequency range and amplitude to the ear canal of a human ear through a receiver;
step 4): measuring the input impedance of the telephone receiver based on the telephone receiver detection circuit;
step 5): calculating the middle ear acoustic immittance through an electrical impedance measurement value based on an electrical impedance and acoustic immittance mapping correlation model, a receiver power acoustic analogy model and an ear canal structure size parameter;
step 6): and adjusting the pressure in the auditory canal through the pressure pump, and repeating the steps 2 to 5 until the auditory canal pressure condition needing to be applied is specified and traversed.
Step 7): the middle ear function is analyzed based on a set of pressure values applied within the ear canal and a corresponding set of middle ear acoustic immittances.
In addition, the method is combined with other physiological parameter sensing test methods, so that the robustness and the accuracy of the middle ear function and other auditory function tests are further enhanced. Other sensory testing modalities such as MRI testing, otoacoustic emission testing, auditory brainstem response testing, air conduction bone conduction threshold testing, and the like.
Example 4
The system constructed by using the above method includes: the system comprises an acoustic immittance calculation model, a pressure module, a receiver impedance testing module and an acoustic immittance output module;
a pressure module; for applying pressure to the ear canal of the subject within a predetermined ear canal pressure range;
a receiver for emitting a sound pressure signal of a determined frequency range and amplitude into the ear canal of the subject;
the receiver impedance testing module is used for the receiver detection circuit to measure the input impedance of the receiver;
the acoustic immittance output module is used for obtaining the acoustic immittance of the middle ear under the pressure value based on the acoustic immittance calculation model according to the input electrical impedance of the receiver;
the acoustic immittance calculation model is an electric power acoustic analogy model, an electric impedance and middle ear acoustic immittance correlation model or a combined model based on the electric power acoustic analogy model and the electric impedance and middle ear acoustic immittance correlation model.
The method for calculating the middle ear acoustic immittance through the input electrical impedance can also reduce or avoid the use of a booster pump, and adjust and change the size and the phase of the middle ear acoustic immittance by adopting other modes. Such as by using different swallowing modalities, by using bone jars to apply pressure, or by increasing the wearing tightening pressure of the headset. When a booster pump and a microphone are not used, the middle ear acoustic immittance tester can be realized by adopting the existing earphone model, and only needs to adopt other modes of adjusting the pressure of the auditory canal to adjust the size of the middle ear acoustic immittance during testing.
The method for analyzing the middle ear acoustic immittance by using the input electrical impedance parameters can be applied to a middle ear analysis system to judge the functions of the tympanic membrane, the ossicular chain and the eustachian tube, thereby achieving the purpose of hearing diagnosis and analysis. Meanwhile, the method can also be used for debugging application of the implanted hearing device. The invention can make the existing middle ear acoustic immittance analysis equipment simpler and more convenient, and can be used together with other hearing equipment to carry out the work of hearing diagnosis or hearing equipment debugging.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A method for analyzing middle ear acoustic immittance using an input electrical impedance parameter, the method calculating the middle ear acoustic immittance by measuring the electrical impedance of the receiver, the method comprising:
step 1) applying pressure to the ear canal of the subject within a predetermined ear canal pressure range;
step 2) sending a sound pressure signal with determined frequency range and amplitude to the auditory canal of the subject through a receiver;
step 3) measuring the input electrical impedance of the telephone receiver based on a pre-established telephone receiver detection circuit;
step 4) obtaining the middle ear acoustic immittance under the pressure value based on a pre-established acoustic immittance calculation model according to the input electrical impedance of the receiver;
step 5) traversing the auditory canal pressure range, and repeating the steps 1) to 4), outputting a pressure value set applied to the auditory canal of the subject and a corresponding middle ear acoustic immittance set;
the acoustic immittance calculation model is as follows: the electric power sound analogy model, the electric impedance and middle ear sound immittance correlation model or a combined model based on the electric power sound analogy model and the electric impedance and middle ear sound immittance correlation model;
the electric power sound analog model has the advantages that the input of the electric power sound analog model is the electrical impedance of a receiver and the structural parameters of an ear canal, the output is the acoustic immittance of a middle ear, and the structure of the model is an electric power sound analog circuit formed by combining an earphone structure, an earphone transduction principle and an earphone, ear canal and middle ear coupling structure;
the input of the electrical impedance and middle ear acoustic immittance correlation model is the electrical impedance of a receiver, the output is the middle ear acoustic immittance, and the structure of the model is a correlation model based on an electrical impedance and middle ear acoustic immittance mapping database;
the establishing step of the electrical impedance and middle ear acoustic immittance correlation model specifically comprises the following steps:
applying pressure to the individual subject's ear canal;
emitting sound pressure with determined frequency range and amplitude in the auditory canal of the subject through a receiver;
measuring the input electrical impedance of the telephone receiver based on a pre-established telephone receiver detection circuit;
calculating the acoustic impedance of the middle ear under the pressure through the output sound pressure of the receiver received by the microphone and the sound pressure reflected in the ear canal;
traversing the ear canal pressure range, repeating the steps, establishing a corresponding relation between the input electrical impedance of the receiver and the corresponding middle ear acoustic immittance under different pressure values, and storing the corresponding relation into the type of the receiver in an electrical impedance and middle ear acoustic immittance mapping database;
establishing an electrical impedance and middle ear acoustic immittance correlation model based on the electrical impedance and middle ear acoustic immittance mapping database;
the input of the combined model based on the electric power sound analog model and the electric impedance and middle ear sound immittance correlation model is the electric impedance of a receiver and the structural parameters of an ear canal, the output is the middle ear sound immittance, and the structure of the model is the combined model based on the electric power sound analog model and the electric impedance and middle ear sound immittance correlation model;
the step 4) specifically comprises the following steps:
if the acoustic immittance calculation model is the electric power acoustic class ratio model, measuring the auditory canal of the subject to obtain auditory canal structure parameters, and matching in the electric power acoustic class ratio model according to the input impedance of the receiver and the auditory canal structure parameters to obtain corresponding middle ear acoustic immittance so as to obtain the middle ear acoustic immittance under the pressure value;
if the acoustic immittance calculation model is an electrical impedance and middle ear acoustic immittance correlation model, matching in the electrical impedance and middle ear acoustic immittance correlation model according to the input electrical impedance of the receiver to obtain a corresponding middle ear acoustic immittance, thereby obtaining the middle ear acoustic immittance under the pressure value;
if the acoustic immittance calculation model is a combined model based on the electric power acoustic analogy model and the electrical impedance and middle ear acoustic immittance correlation model, measuring the ear canal of the subject to obtain the ear canal structural parameters, and matching in the combined model based on the electric power acoustic analogy model and the electrical impedance and middle ear acoustic immittance correlation model according to the input impedance of the receiver and the ear canal structural parameters to obtain the corresponding middle ear acoustic immittance, thereby obtaining the middle ear acoustic immittance under the pressure value.
2. The method for parametric analysis of middle ear acoustic immittance using input electrical impedance of claim 1 wherein the receiver detection circuit is a circuit formed by connecting a power supply, a resistor and a receiver in series.
3. The method for parametric analysis of middle ear acoustic immittance using input electrical impedance of claim 2, wherein step 3) comprises in particular:
measuring resistance and input voltage V of receiver1；
Measuring input voltage V of receiver2；
Calculating the input electrical impedance Z of the receiver:
Z＝Rr·V2/(V2-V1)；
wherein the resistance value of the resistor is Rr。
4. A system for parametric analysis of middle ear acoustic immittance using input electrical impedance, the system comprising: the system comprises a pressure module, a receiver impedance testing module, an acoustic immittance output module and an acoustic immittance calculation model;
the pressure module; for applying pressure to the ear canal of the subject within a predetermined ear canal pressure range;
the receiver is used for sending out a sound pressure signal with determined frequency range and amplitude to the ear canal of the subject;
the receiver impedance testing module is used for the receiver detection circuit to measure the input impedance of the receiver;
the acoustic immittance output module is used for obtaining the middle ear acoustic immittance under the pressure value based on an acoustic immittance calculation model according to the input electrical impedance of the receiver;
the acoustic immittance calculation model is as follows: the electric power sound analogy model, the electric impedance and middle ear sound immittance correlation model or a combined model based on the electric power sound analogy model and the electric impedance and middle ear sound immittance correlation model;
the electric power sound analog model has the advantages that the input of the electric power sound analog model is the electrical impedance of a receiver and the structural parameters of an ear canal, the output is the acoustic immittance of a middle ear, and the structure of the model is an electric power sound analog circuit formed by combining an earphone structure, an earphone transduction principle and an earphone, ear canal and middle ear coupling structure;
the input of the electrical impedance and middle ear acoustic immittance correlation model is the electrical impedance of a receiver, the output is the middle ear acoustic immittance, and the structure of the model is a correlation model based on an electrical impedance and middle ear acoustic immittance mapping database;
the establishing step of the electrical impedance and middle ear acoustic immittance correlation model specifically comprises the following steps:
applying pressure to the individual subject's ear canal;
emitting sound pressure with determined frequency range and amplitude in the auditory canal of the subject through a receiver;
measuring the input electrical impedance of the telephone receiver based on a pre-established telephone receiver detection circuit;
calculating the acoustic impedance of the middle ear under the pressure through the output sound pressure of the receiver received by the microphone and the sound pressure reflected in the ear canal;
traversing the ear canal pressure range, repeating the steps, establishing a corresponding relation between the input electrical impedance of the receiver and the corresponding middle ear acoustic immittance under different pressure values, and storing the corresponding relation into the type of the receiver in an electrical impedance and middle ear acoustic immittance mapping database;
establishing an electrical impedance and middle ear acoustic immittance correlation model based on the electrical impedance and middle ear acoustic immittance mapping database;
the input of the combined model based on the electric power sound analog model and the electric impedance and middle ear sound immittance correlation model is the electric impedance of a receiver and the structural parameters of an ear canal, the output is the middle ear sound immittance, and the structure of the model is the combined model based on the electric power sound analog model and the electric impedance and middle ear sound immittance correlation model;
the specific implementation of the acoustic immittance output module comprises:
if the acoustic immittance calculation model is the electric power acoustic class ratio model, measuring the auditory canal of the subject to obtain auditory canal structure parameters, and matching in the electric power acoustic class ratio model according to the input impedance of the receiver and the auditory canal structure parameters to obtain corresponding middle ear acoustic immittance so as to obtain the middle ear acoustic immittance under the pressure value;
if the acoustic immittance calculation model is an electrical impedance and middle ear acoustic immittance correlation model, matching in the electrical impedance and middle ear acoustic immittance correlation model according to the input electrical impedance of the receiver to obtain a corresponding middle ear acoustic immittance, thereby obtaining the middle ear acoustic immittance under the pressure value;
if the acoustic immittance calculation model is a combined model based on the electric power acoustic analogy model and the electrical impedance and middle ear acoustic immittance correlation model, measuring the ear canal of the subject to obtain the ear canal structural parameters, and matching in the combined model based on the electric power acoustic analogy model and the electrical impedance and middle ear acoustic immittance correlation model according to the input impedance of the receiver and the ear canal structural parameters to obtain the corresponding middle ear acoustic immittance, thereby obtaining the middle ear acoustic immittance under the pressure value.
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