Hearing test device with self-feedback calibration and calibration method thereof

Abstract

According to the hearing test device with the self-feedback calibration function and the calibration method of the hearing test device, hearing test audio frequency emitted by a transducer is collected through Mic, the frequency and the strength of the hearing test audio frequency are calculated and compared with the frequency and the strength of the designed output audio frequency, the audio frequency output is corrected through errors obtained through comparison, accurate frequency and strength output is obtained, and the calibration accuracy of the hearing test device is improved. The whole process is automatically operated, and manual intervention is not needed.

Description

Technical Field

[0001] The invention relates to the field of hearing test devices, and in particular to a hearing test device with self-feedback calibration and a calibration method thereof. Background Art

[0002] Hearing tests are an important means for hospitals and professional institutions to assess the degree of hearing loss of the testee and determine which part of the body has a problem. The equipment usually used for hearing tests is a pure tone audiometer. To ensure the accuracy of the hearing test results, the audiometer must be calibrated. The calibration of the audiometer is mainly to check whether the sound signal emitted by the audiometer transducer meets the requirements of relevant standards in terms of frequency, intensity and time.

[0003] The devices used to calibrate pure tone audiometers mainly include standard measuring instruments and supporting measuring equipment (Ji Fei, Yu Liming, Chen Hongwen. Zero-order calibration equipment and methods for pure tone audiometers [J]. Chinese Journal of Hearing and Speech Rehabilitation Science, 2017, 15(06): 464-467.). For low-cost portable audiometers, the calibration method is cumbersome, automatic calibration cannot be achieved, and the calibration cost is high. Summary of the invention

[0004] In order to solve the problem of automatic calibration of a portable audiometer, the present invention proposes a hearing test device with self-feedback calibration and a calibration method thereof. The hearing test audio emitted by a transducer is collected by a Mic (microphone), and its frequency and intensity are calculated. The audio frequency and intensity are compared with the designed output audio frequency and intensity, and the error obtained by the comparison is used to correct the audio output to obtain accurate frequency and intensity output, thereby achieving the purpose of calibrating the hearing test. The whole process is automatically operated without manual intervention.

[0005] The technical solution of the present invention is: a hearing test device with self-feedback calibration, comprising a hearing test audio processing unit, an audio output power control unit, a transducer, a microphone, a Mic audio acquisition unit, a frequency calculation unit, a sound pressure level calculation unit, a frequency comparison unit and a sound pressure level comparison unit;

[0006] The hearing test audio processing unit is used to generate pure tone signals required for the hearing test;

[0007] The audio output power control unit is used to perform power control on the pure tone signal to form an audio output signal;

[0008] The transducer is used to convert the audio output signal into an acoustic signal;

[0009] The microphone is used to convert the acoustic signal into an electrical signal;

[0010] The Mic audio acquisition unit is used to convert electrical signals into digital signals;

[0011] The frequency calculation unit is used to calculate the audio frequency of the digital signal;

[0012] The sound pressure level calculation unit is used to calculate the audio sound pressure level of the digital signal;

[0013] The frequency comparison unit is used to compare the audio frequency of the digital signal with the initial audio frequency of the designed output to obtain the frequency error between the actual output and the designed output;

[0014] The sound pressure level comparison unit is used to compare the sound pressure level of the digital signal with the initial audio sound pressure level of the designed output, and obtain the sound pressure level error between the actual output and the designed output.

[0015] Furthermore, the microphones are two microphones installed around the transducer.

[0016] Furthermore, the audio sound pressure level of the digital signal includes sound pressure level, equivalent continuous sound pressure level, sound exposure level, maximum sound pressure level, minimum sound pressure level and weighted sound pressure level.

[0017] The present invention also provides a calibration method implemented according to the hearing test device with self-feedback calibration, and the specific steps are as follows:

[0018] Step 1, setting the initial audio frequency and initial audio sound pressure level for pre-output calibration;

[0019] Step 2: Generate a corresponding pure tone signal according to the set initial audio frequency and initial audio sound pressure level;

[0020] Step 3: Power control the pure tone signal to form an audio output signal;

[0021] Step 4: Convert the audio output signal into an acoustic signal using a transducer;

[0022] Step 5: Use a microphone to convert the sound signal into an electrical signal;

[0023] Step 6: Convert the electrical signal into a digital signal;

[0024] Step 7: Calculate the audio frequency of the digital signal;

[0025] Step 8: Calculate the audio sound pressure level of the digital signal;

[0026] Step 9: Compare the audio frequency of the digital signal with the initial audio frequency of the designed output to obtain a frequency error; if the frequency error is less than a specified value, the frequencies are considered to be the same; otherwise, the frequencies are considered to be different;

[0027] Step 10: Compare the audio sound pressure level of the digital signal with the initial audio sound pressure level of the designed output to obtain a sound pressure level error; if the sound pressure level error is less than a specified value, the sound pressure levels are considered to be the same; otherwise, the sound pressure levels are considered to be different;

[0028] Step 11: If the frequency or the sound pressure level is different, the frequency and the intensity are corrected according to the frequency error and the sound pressure level error, and the pure tone signal is regenerated, and steps 3 to 10 are repeated until the frequency and the sound pressure level are the same;

[0029] Step 12: If the frequency and sound pressure level are the same, determine whether the calibration of all frequencies and intensities has been completed. If so, proceed to step 14; if not, proceed to step 13;

[0030] Step 13: Switch to the next calibrated initial audio frequency and initial audio sound pressure level, and repeat steps 2 to 12 until the calibration of all frequencies and sound pressure levels is completed;

[0031] Step 14: After completing the calibration of all frequencies and sound pressure levels, save the calibration results into the non-volatile memory of the hearing test device;

[0032] Step 15. The calibration process is completed.

[0033] The beneficial effects of the present invention are as follows: providing a hearing test device with self-feedback calibration and a calibration method thereof, collecting the hearing test audio emitted by the transducer through a Mic (microphone), calculating its frequency and intensity, comparing it with the designed output audio frequency and intensity, using the error obtained by comparison to correct the audio output, obtaining accurate frequency and intensity output, and achieving the purpose of calibrating the hearing test.

[0034] After the calibration is completed, during the hearing test, the calibration results stored in the non-volatile memory of the hearing test device can be used to adjust the frequency and sound pressure level of the audio so that the output hearing threshold results are basically the same as the designed output, thereby ensuring the accuracy of the hearing test results.

[0035] The whole process is automatic and no human intervention is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a block diagram of the hearing test device with self-feedback calibration;

[0037] Figure 2 A calibration method for a hearing test device with self-feedback calibration. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] like Figure 1 A hearing test device with self-feedback calibration, comprising:

[0040] The hearing test audio processing unit 1 generates a pure tone signal a required for the hearing test.

[0041] The audio output power control unit 2 performs power control on the pure tone signal a to form an audio output signal d.

[0042] The transducer 3 converts the audio output signal d into an acoustic signal e.

[0043] Microphone 4, two microphones installed around transducer 3, converts the acoustic signal e into an electrical signal f.

[0044] Mic audio acquisition unit 5 converts the electrical signal f into a digital signal g.

[0045] The frequency calculation unit 6 calculates the audio frequency h of the digital signal g.

[0046] The sound pressure level calculation unit 7 calculates the audio sound pressure level i of the digital signal g, including the sound pressure level (SPL), equivalent continuous sound pressure level (Leq), sound exposure level (SEQ), maximum sound pressure level (Max), minimum sound pressure level (Min), weighted sound pressure level (dB A), etc.

[0047] The frequency comparison unit 8 compares the audio frequency h of the digital signal with the initial audio frequency c of the designed output to obtain a frequency error j between the actual output and the designed output.

[0048] The sound pressure level comparison unit 9 compares the sound pressure level i of the digital signal g with the designed initial audio sound pressure level b to obtain a sound pressure level error k between the actual output and the designed output.

[0049] like Figure 2 As shown, a hearing test device with self-feedback calibration implements a calibration process 100, including:

[0050] 1. Setting the audio frequency and sound pressure level (step 1001), setting the initial audio frequency c and initial audio sound pressure level b for pre-output calibration;

[0051] 2. Generate an audio signal (step 1002), and generate a corresponding pure tone signal a according to the set initial audio frequency and initial audio sound pressure level;

[0052] 3. Power output control (step 1003), performing power control on the pure tone signal a to form an audio output signal d;

[0053] 4. Generate an audio signal (step 1004), using the transducer 3 to convert the audio output signal d into an acoustic signal e;

[0054] 5. Collecting acoustic signals (step 1005), using microphone 4, converting the acoustic signal e into an electrical signal f;

[0055] 6. Convert to digital signal (step 1006), convert the electrical signal f into digital signal g;

[0056] 7. Calculate the audio frequency h (step 1007) and the audio sound pressure level i (step 1008) of the digital signal g;

[0057] 8. Compare the audio frequency h of the digital signal g with the initial audio frequency c of the designed output to obtain a frequency error j. If the frequency error j is less than a specified value, the frequencies are considered to be the same (step 1009), otherwise the frequencies are considered to be different. Compare the audio sound pressure level i of the digital signal g with the initial audio sound pressure level b of the designed output to obtain a sound pressure level error k. If the sound pressure level error k is less than a specified value, the sound pressure levels are considered to be the same (step 1010), otherwise the sound pressure levels are considered to be different.

[0058] 9. If the frequency or sound pressure level is different, the frequency and intensity are corrected according to the frequency error j and the sound pressure level error k (step 1011), the pure tone signal a is regenerated, and steps 1003 to 1010 are repeated until the frequency and sound pressure level are the same;

[0059] 10. If the frequency and the sound pressure level are the same, determine whether the calibration of all frequencies and intensities has been completed (step 1012). If not, switch to the next calibrated frequency and sound pressure level (step 1013), and repeat steps 1002 to 1012 until the calibration of all frequencies and sound pressure levels is completed;

[0060] 11. After completing the calibration of all frequencies and sound pressure levels, the calibration results are saved in the non-volatile memory of the hearing test device (step 1014);

[0061] 12. At this point, the calibration process is completed (step 1015), and the entire process is automatic and does not require human intervention.

[0062] After the calibration is completed, during the hearing test, the calibration results stored in the non-volatile memory of the hearing test device can be used to adjust the frequency and sound pressure level of the audio so that the output hearing threshold results are basically the same as the designed output, thereby ensuring the accuracy of the hearing test results.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hearing test device with self-feedback calibration, characterized in that: It comprises a hearing test audio processing unit (1), an audio output power control unit (2), a transducer (3), a microphone (4), a Mic audio acquisition unit (5), a frequency calculation unit (6), a sound pressure level calculation unit (7), a frequency comparison unit (8) and a sound pressure level comparison unit (9); The hearing test audio processing unit (1) is used to generate a pure tone signal required for the hearing test; The audio output power control unit (2) is used to control the power of the pure tone signal to form an audio output signal; The transducer (3) is used to convert the audio output signal into an acoustic signal; The microphone (4) is used to convert the acoustic signal into an electrical signal; The Mic audio acquisition unit (5) is used to convert the electrical signal into a digital signal; The frequency calculation unit (6) is used to calculate the audio frequency of the digital signal; The sound pressure level calculation unit (7) is used to calculate the audio sound pressure level of the digital signal; The frequency comparison unit (8) is used to compare the audio frequency of the digital signal with the initial audio frequency of the designed output to obtain the frequency error between the actual output and the designed output; The sound pressure level comparison unit (9) is used to compare the sound pressure level of the digital signal with the initial audio sound pressure level of the designed output, so as to obtain the sound pressure level error between the actual output and the designed output.

2. A hearing test device with self-feedback calibration according to claim 1, characterized in that: The microphones (4) are two microphones installed around the transducer (3).

3. A hearing test device with self-feedback calibration according to claim 1, characterized in that: The audio sound pressure level of the digital signal includes sound pressure level, equivalent continuous sound pressure level, sound exposure level, maximum sound pressure level, minimum sound pressure level and weighted sound pressure level.

4. The calibration method implemented by the hearing test device with self-feedback calibration according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: Step 1, setting the initial audio frequency and initial audio sound pressure level for pre-output calibration; Step 2: Generate a corresponding pure tone signal according to the set initial audio frequency and initial audio sound pressure level; Step 3: Power control the pure tone signal to form an audio output signal; Step 4: Convert the audio output signal into an acoustic signal using a transducer; Step 5: Use a microphone to convert the sound signal into an electrical signal; Step 6: Convert the electrical signal into a digital signal; Step 7: Calculate the audio frequency of the digital signal; Step 8: Calculate the audio sound pressure level of the digital signal; Step 9: Compare the audio frequency of the digital signal with the initial audio frequency of the designed output to obtain a frequency error; if the frequency error is less than a specified value, the frequencies are considered to be the same; otherwise, the frequencies are considered to be different; Step 10: Compare the audio sound pressure level of the digital signal with the initial audio sound pressure level of the designed output to obtain a sound pressure level error; if the sound pressure level error is less than a specified value, the sound pressure levels are considered to be the same; otherwise, the sound pressure levels are considered to be different; Step 11: If the frequency or the sound pressure level is different, the frequency and the intensity are corrected according to the frequency error and the sound pressure level error, and the pure tone signal is regenerated, and steps 3 to 10 are repeated until the frequency and the sound pressure level are the same; Step 12: If the frequency and sound pressure level are the same, determine whether the calibration of all frequencies and intensities has been completed. If so, proceed to step 14; if not, proceed to step 13; Step 13: Switch to the next calibrated initial audio frequency and initial audio sound pressure level, and repeat steps 2 to 12 until the calibration of all frequencies and sound pressure levels is completed; Step 14: After completing the calibration of all frequencies and sound pressure levels, save the calibration results into the non-volatile memory of the hearing test device; Step 15. The calibration process is completed.

Images