CN114286252A - Method for calibrating frequency response of playing equipment - Google Patents
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Abstract
The invention provides a method for calibrating frequency response of playing equipment, which comprises the steps of firstly calculating the amplitude proportional relationship of equal responses with different frequencies according to a frequency response curve on a hearing threshold, then adjusting the actual amplitude proportional relationship of sounds with different frequencies when equal responses are achieved by a user by playing the sounds with different frequencies, and finally adjusting the actually increased or decreased response value of each frequency band according to the two proportional relationships. The calibration method of the invention can ensure that the same audio data can obtain the same hearing experience when different people use different audio playing devices.
Description
Technical Field
The invention relates to the technical field of hearing equipment and signal processing, in particular to a method for calibrating frequency response of playing equipment.
Background
Each audio file has its own frequency spectrum, but the situation that the user hears sound is different due to different playing devices. That is, the spectrum of the actual played sound based on different playback devices may appear different from the spectrum of the original audio. For example, the loudness at 1000Hz is 20dB higher than at 2000Hz in the original audio, but due to the difference between the headphones and the audio output device, the loudness at 1000Hz may exceed the loudness at 2000Hz by only 10 dB. Meanwhile, since sound is subjective feeling of users, even if the same playing device plays the same audio, different users may receive different playing frequency responses and give different subjective feedback because each person has different hearing ability. Therefore, in many application scenarios, even if the same set of playback device is used, the same audio data is played to different users, and because the audio producer and the audience of the playback device experience inconsistently, the problem of inaccurate debugging result or too long debugging time for the device or the audio data may occur.
Disclosure of Invention
In order to solve the problem that the playing effect is inconsistent when the same audio is played based on different audio playing devices and audio output devices or faces different users, the invention provides a playing device frequency response calibration method, which calibrates the frequency response curves of an earphone and the audio playing devices thereof based on the subjective hearing condition of each user and a standard equal loudness curve, so that each user can feel the sound which is expected to be heard by a music producer when the same audio is based on different audio playing devices, audio output devices and faces different users.
The technical scheme of the invention is as follows: a method for calibrating the frequency response of a player device, comprising the steps of:
s1: connecting the audio output device to be calibrated to an audio playing device;
selecting one ear of the user as a test ear;
s2: selecting a pure tone test audio as a reference audio, wherein the frequency of the reference audio is F0;
s3: playing the reference audio based on the audio playing device, and starting to give sound to the output device corresponding to the test ear;
in the process that the audio playing device plays the reference audio, adjusting the amplitude of the reference audio to enable the test ear of the user to just hear the sound of the reference audio, and recording the amplitude of the reference audio which can be heard at the moment as a reference amplitude A0;
s4: adjusting the amplitude of the reference audio to make the corresponding amplitude be marked as A0' when the playing loudness of the reference audio is increased by a;
s5: selecting a control ear; selecting a pure tone with the frequency of F0 as a test audio;
adjusting the amplitude of the test audio to enable a user to feel that the loudness of the test audio played by a control ear is equal to the loudness of a reference audio with the amplitude of A0', and marking the amplitude of the test audio corresponding to the control ear at the moment as Ac;
s6: acquiring a frequency point to be calibrated in the frequency range of the reference frequency F0;
setting the frequency points to be calibrated comprises: fn, F1, F2..;
wherein n is a natural number and is the number of frequency points to be calibrated;
s7: based on the equal loudness curve above the hearing threshold a, calculating and obtaining the sound intensity difference value when the pure tone of each frequency point to be calibrated is equal to the pure tone of the reference frequency F0, and recording as follows: d1, d2, …, dn;
s8: calculating the amplitudes of the pure tone corresponding to the frequency point to be calibrated and the pure tone of the reference frequency F0 when the loudness of the pure tone and the pure tone is equal, and respectively recording as follows: a1, a2.. An;
s9: playing a pure tone with amplitude Ac and frequency F0 to the control ear;
s10: playing the pure tone audio to be calibrated of the frequency point to be calibrated to the test ear;
when the audio to be calibrated is played, setting the initial amplitude to be A0';
in the playing process, adjusting the amplitude of the audio to be calibrated until the loudness felt by the reference ear and the loudness felt by the test ear are equal, recording the corresponding pure tone amplitude of the frequency point to be calibrated as the calibrated amplitude;
the calibrated amplitude corresponding to the audio to be calibrated of the frequency point to be calibrated is as follows: a1 ', a2 ', …, An ';
s11: respectively compensating the gain output in the frequency range near the frequency point to be calibrated corresponding to each audio frequency to be calibrated, wherein the compensated gain is as follows:
20log(A1’-A1)，
20log(A2’- A2)，…，
20log(An’- An)；
and then, obtaining the corresponding frequency response calibration value of the test ear on the audio output device and the audio playing device.
It is further characterized in that:
it also includes the following steps:
s12: determining whether the playback device frequency response on the other side of the test ear is to be calibrated;
if the adjustment is required, step S13 is executed;
if not, ending the calibration;
s13: setting the other side ear of the test ear as a test ear, and circularly executing the steps S2-S11;
s14: simultaneously and respectively playing pure tones with the frequency of F0 to the ears on the two sides, and adjusting the amplitude of the pure tones of the left ear and the right ear to ensure that the loudness of the left ear and the right ear is equal;
at this time, the corresponding two output gains are the corresponding frequency response calibration values of the ears on the audio output equipment and the audio playing equipment;
finishing the calibration;
the control ear can be the test ear or the other lateral ear;
the values of F1, F2... Fn in the frequency points to be calibrated are:
125Hz、250Hz、500Hz、1000Hz、2000Hz、3000Hz、4000Hz、5000Hz、6000Hz、7000Hz、8000Hz、9000Hz、10000Hz；
in step S14, the following are set: the amplitude of the pure tone of the left ear is Al, the amplitude of the pure tone of the right ear is Ar, and the method for enabling the loudness of the left ear and the loudness of the right ear to be equal comprises the following steps:
increase the output gain of the left ear by 20log (Al-Ar) dB
Or increasing the output muscle of the right ear by 20log (Ar-Al) dB;
the frequency range of the reference frequency F0 is: f0 is more than or equal to 125Hz and less than or equal to 10000 Hz;
in step S4, the value range of the loudness increase value a is: a is more than or equal to 5dB and less than or equal to 100 dB;
in step S8, a1 and a2.. An are calculated by:
A1= A0’*10^(d1/20)；
A 2= A0’*10^(d1/20),
…
A n= A0’*10^(dn/20)；
in step S11, the method for increasing the gain output in the frequency range near the frequency point to be calibrated includes:
the frequency point to be calibrated comprises: fn, F1, F2..;
setting two adjacent frequency points as Fi-1 and Fi, wherein i is more than or equal to 2 and less than or equal to n;
if the Fi-1 frequency range is (f 1, f 2) and the Fi frequency range is (f 2, f 3), the following are:
f1< Fi-1<f2< Fi <f3
the continuous frequency between f1 and f2 is the frequency in the range near the frequency point to be calibrated by taking Fi-1 as the frequency point to be calibrated, and the increasing gain is obtained by calculating the gain required to be increased at the position of the Fi-1;
the continuous frequency between f2 and f3 is the frequency in the range near the frequency point to be calibrated by using Fi, and the increased gain is obtained by calculating the gain required to be increased at the position of the Fi;
the audio output device includes: power amplifier equipment, earphone.
The invention provides a method for calibrating the frequency response of playing equipment, which uses pure-tone audio data to play through audio output equipment and audio playing equipment to be calibrated, and obtains the loudness of the played pure tone based on the subjective auditory perception of a user; the frequency F0 of reference audio played by the control ear is taken as a reference, pure tones corresponding to each frequency point to be calibrated are played by the test ear, and when the loudness sensed by the user in two times of playing is the same, the calibrated amplitude corresponding to each frequency point to be calibrated is found; acquiring a sound intensity difference value when the pure tone of each frequency point to be calibrated is equal to the pure tone of the reference frequency F0 based on the standard equal-loudness curve; and finally, converting the amplitude after calibration into corresponding gain values of each frequency point to be calibrated on the audio output equipment and the audio playing equipment based on the sound intensity difference, and completing calibration of the audio output equipment and the audio playing equipment. In the technical scheme of the invention, the frequency response curves of the audio output equipment and the audio playing equipment are calibrated based on the hearing condition of a user and a standard equal-response curve to obtain a frequency response calibration value aiming at a specific user on the audio output equipment and the audio playing equipment, so that the actual frequency response curve of sound played by the audio output equipment at the eardrum of the user is approximate to a smooth straight line, and the sound expected to be heard by a music producer is ensured to be felt by a patient; based on the technical scheme of the invention, the frequency response calibration is carried out on the user and the equipment simultaneously, the simultaneous calibration of the difference of the actual hearing conditions of the user and the playing equipment such as audio source equipment, earphone and sound equipment is realized, and the same audio is ensured to be based on different audio playing equipment, audio output equipment and facing different users, and each user can feel the sound which is expected to be heard by a music producer.
Drawings
Fig. 1 is a schematic flow chart of a method for calibrating frequency response of a playback device;
FIG. 2 is a time domain waveform of a pure tone at frequency F0 with amplitude A0 and amplitude A0' after loudness enhancement a;
FIG. 3 is a schematic diagram of an actual frequency response curve and an ideal frequency response curve of an audio output device and an audio playing device;
fig. 4 shows the theoretical amplitude and the actual amplitude of the equal response of the frequency points Fi and F0 to be calibrated.
Detailed Description
As shown in fig. 1, in the present technical solution, a calibration method for a frequency response of a playing device is applicable to various audio devices and users with various hearing conditions, a decibel difference value of each frequency equal loudness theoretically when the audio device is used by most normal hearing users is calculated according to an equal loudness curve, then a decibel difference value of each frequency equal loudness actually is calculated according to specific audio output devices, playing devices and specific users by means of subjective equal loudness feeling of the users, and a compensation gain is performed according to the two difference values. Which comprises the following steps.
S1: connecting the audio output device to be calibrated to an audio playing device;
one ear of the user is selected as the test ear.
The audio output device of the present invention includes: power amplifier equipment and earphones; in this embodiment, the calibration is performed using a headphone.
S2: the test audio of pure tone is selected as the reference audio, and the frequency of the reference audio is F0.
The frequency range of the reference frequency F0 is: f0 is more than or equal to 125Hz and less than or equal to 10000 Hz; in this embodiment, F0 is 1000 Hz.
S3: playing the reference audio based on the audio playing equipment, and starting to give sound to the audio output equipment corresponding to the test ear;
during the process of playing the reference audio by the audio playing device, the amplitude of the reference audio is adjusted to enable the test ear of the user to just hear the sound of the reference audio, and the amplitude of the reference audio which can be heard at this time is recorded as the reference amplitude A0.
S4: adjusting the amplitude of the reference audio to make the corresponding amplitude be marked as A0' when the playing loudness of the reference audio is increased by a;
the value range of the loudness increase value a is as follows: a is more than or equal to 5dB and less than or equal to 100 dB; in this embodiment, a is 10 dB.
The loudness increase a is related to the amplitude by: a =20 log (a 0'/a 0);
a0 is the reference amplitude of the reference audio, a 0' is the adjusted amplitude of the reference audio.
As shown in fig. 2, the time domain waveform diagram is a pure sound with frequency F0 and amplitude a0 and amplitude a 0' after loudness enhancement a. The time domain waveform diagram in the figure has an amplitude on the abscissa and a time on the ordinate, and is realized as a waveform of a pure tone with a frequency of F0 when played at a reference amplitude of a0, and a waveform diagram with an amplitude of a 0' after the loudness of the pure tone with a frequency of F0 is increased by a is shown as a dotted line.
S5: selecting a control ear; selecting a pure tone with the frequency of F0 as a test audio;
adjusting the amplitude of the test audio to enable a user to feel that the loudness of the test audio played by a control ear is equal to the loudness of a reference audio with the amplitude of A0', and marking the amplitude of the test audio corresponding to the control ear at the moment as Ac;
in specific implementation, the control ear may be a test ear or another ear according to the specific situation of the user.
S6: acquiring a frequency point to be calibrated in a frequency range of a reference frequency F0;
setting the frequency points to be calibrated comprises the following steps: fn, F1, F2..;
wherein n is a natural number and is the number of frequency points to be calibrated;
in this embodiment, n is 13, and values of F1 and F2... Fn in the frequency point to be calibrated are as follows:
125Hz、250Hz、500Hz、1000Hz、2000Hz、3000Hz、4000Hz、5000Hz、6000Hz、7000Hz、8000Hz、9000Hz、10000Hz。
s7: based on the equal loudness curve above the hearing threshold a, calculating and obtaining the sound intensity difference value when the pure tone of each frequency point to be calibrated is equal to the pure tone of the reference frequency F0, and recording the difference value as follows: d1, d2, …, dn;
the equal loudness curve is a curve describing the relationship between sound pressure level and sound wave frequency under equal loudness conditions, and is one of important auditory characteristics. Which indicates what sound pressure level pure tones at different frequencies need to be reached in order to obtain a consistent auditory loudness for the listener. The ISO international organization for standardization has also set out equal loudness contours in 1961. The abscissa is the frequency of the sound and the ordinate is the sound pressure level, and the individual points on each curve, although different in frequency and sound pressure level, are consistent in loudness.
S8: converting the sound intensity into amplitude values based on the sound intensity difference values d1, d2, … and dn, calculating the amplitudes of the pure tone corresponding to the frequency point to be calibrated and the pure tone of the reference frequency F0 when the loudness is equal, and respectively recording the amplitudes as follows: a1, a2.. An;
A1= A0’*10^(d1/20)；
A2= A0’*10^(d1/20),
…
An= A0’*10^(dn/20)。
s9: a pure tone with amplitude Ac and frequency F0 is played in the control ear.
S10: playing the pure tone audio frequencies to be calibrated of the frequency points to be calibrated one by one at the test ear;
when the audio to be calibrated is played, setting the initial amplitude to be A0';
in the playing process, adjusting the amplitude of the audio to be calibrated until the loudness of the comparison ear and the test ear is equal, recording the corresponding amplitude as the amplitude after calibration;
the calibrated amplitude corresponding to the audio to be calibrated of the frequency point to be calibrated is as follows: a1 ', a2 ', …, An ';
based on the hearing condition of a user, calibrating the playing effects of audio output equipment and audio playing equipment to be calibrated by comparing the loudness experienced by ears and testing the loudness experienced by the ears, wherein each frequency point to be calibrated corresponds to a calibrated amplitude; and the calibration of the audio output equipment and the audio playing equipment is realized through all the frequency points to be calibrated.
S11: as shown in fig. 4, on the audio output device and the audio playing device to be calibrated, the actual amplitudes of the pure tone with the frequency Fi and the pure tone with the frequency F0 and the amplitude a0 'when they are equal, i.e. the amplitude is Ai' after calibration; based on the equal loudness curve calculation, the theoretical amplitude of the equal loudness curve when the pure tone with the frequency Fi and the pure tone with the frequency F0 and the amplitude A0' are equal loudness is as follows: ai;
respectively compensating the gain output in the frequency range near the frequency point to be calibrated corresponding to each audio to be calibrated, wherein the compensated gain is as follows:
20log(A1’- A1)，
20log(A2’- A2)，…，
20log(An’-An)；
after bringing in a1, a2.. An, is:
20log(A1’-A0’*10^(d1/20))，
20log(A2’-A0’*10^(d2/20))，…，
20log(An’-A0’*10^(dn/20))。
and converting the calibrated amplitude into a gain value to obtain the corresponding frequency response calibration value of the test ear on the audio output equipment and the audio playing equipment.
The further method for increasing the gain output in the frequency range near the frequency point to be calibrated is as follows:
the frequency points to be calibrated comprise: fn, F1, F2..;
setting two adjacent frequency points as Fi-1 and Fi, wherein i is more than or equal to 2 and less than or equal to n;
if the Fi-1 frequency range is (f 1, f 2) and the Fi frequency range is (f 2, f 3), the following are:
f1< Fi-1<f2< Fi <f3
the continuous frequency between f1 and f2 is the frequency in the range near the frequency point to be calibrated by taking Fi-1 as the frequency point to be calibrated, and the increasing gain is obtained by calculating the gain required to be increased at the position of the Fi-1; the continuous frequency between f2 and f3 is the frequency in the range near the frequency point to be calibrated by using Fi, and the increased gain is obtained by calculating the gain required to be increased at the position of the Fi; in normal calculation, f1, f2 and f3 respectively take the intermediate values of adjacent frequency points to be calibrated, when Fi-1 is f1, the value of f1 corresponding to Fi-1 is equal to f2, and when Fi is Fn, the value of f3 corresponding to Fi is equal to f2.
E.g., Fi-1=1000Hz, Fi =2000Hz, then f1<1000Hz < f2<2000Hz < f 3;
wherein the continuous frequency between f1 and f2 is the frequency in the range near the frequency point to be calibrated by 1000Hz, the increasing gain is obtained by calculation according to the gain needing to be increased at 1000Hz, and the continuous frequency between f2 and f3 is the frequency in the range near the frequency point to be calibrated by 2000Hz, and the increasing gain is obtained by calculation according to the gain needing to be increased at 2000 Hz.
S12: determining whether the frequency response of the playback device on the other side of the test ear is to be calibrated;
if the adjustment is required, step S13 is executed;
if not, the calibration is finished. That is, the technical solution of the present invention is applicable to both ear frequency response calibration and monaural frequency response calibration.
S13: and setting the other side ear of the test ear as the test ear, circularly executing the steps S2-S11, and executing the step S14 after obtaining the corresponding frequency response calibration value of the other side ear on the same set of audio output equipment and audio playing equipment.
S14: the pure tone with the frequency of F0 is played simultaneously and respectively to the ears on both sides, the amplitude of the pure tone of the left ear and the right ear is adjusted, the loudness of the left ear and the right ear is equal, and the adjustment of the volume difference of the ears on both sides of the patient is realized.
Setting: the amplitude of the pure tone of the left ear is Al, the amplitude of the pure tone of the right ear is Ar, and the method for enabling the loudness of the left ear and the loudness of the right ear to be equal comprises the following steps:
increase the output gain of the left ear by 20log (Al-Ar) dB
Or increasing the output muscle of the right ear by 20log (Ar-Al) dB;
at this time, the corresponding two output gains are the corresponding frequency response calibration values of the ears on the audio output equipment and the audio playing equipment; the actual frequency response curve of the sound played by the audio output equipment at the eardrums of the left ear and the right ear of the user is approximate to a smooth straight line, so that the balance debugging of the ears is realized, and the calibration is finished.
As shown in fig. 3, which is a schematic diagram of an actual frequency response curve and an ideal frequency response curve of an audio output device and an audio playing device, the dashed lines in the diagram represent original actual frequency response curves of the audio output device and the audio playing device, and the solid lines represent calibrated ideal frequency domain curves.
After the technical scheme of the invention is used, the frequency response curves of different hardware devices at the eardrum of the human ear can be adjusted to be smooth, namely, the frequency spectrum of the sound actually heard by the human ear is consistent with the frequency spectrum of the original digital quantity of the sound, and the loudness felt by the two ears is consistent. Because the frequency response at the eardrum of the user is being adjusted, the content of the adjustment includes: compared with the existing method of simply adjusting the frequency response of the equipment or the method of simply compensating the difference of the user hearing abilities, the difference of the actual audio source equipment, the playing equipment such as the earphone sound and the like and the difference of the actual hearing abilities of the user has better pertinence and better effect. In the technical scheme, firstly, the amplitude proportional relationship of a plurality of sounds with different frequencies and equal responses is calculated according to a frequency response curve of a dB (a is more than or equal to 10 and less than or equal to 100) above an auditory threshold, then the user is adjusted to the actual amplitude proportional relationship of the sounds with different frequencies and equal responses, and finally, the response value which is actually increased or decreased at each frequency band is adjusted according to the two proportional relationships. The calibration method of the invention can ensure that the same audio data can obtain the same hearing experience when different people use different audio playing devices.
Claims (9)
1. A method for calibrating the frequency response of a player device, comprising the steps of:
s1: connecting the audio output device to be calibrated to an audio playing device;
selecting one ear of the user as a test ear;
s2: selecting a pure tone test audio as a reference audio, wherein the frequency of the reference audio is F0;
s3: playing the reference audio based on the audio playing device, and starting to give sound to the output device corresponding to the test ear;
in the process that the audio playing device plays the reference audio, adjusting the amplitude of the reference audio to enable the test ear of the user to just hear the sound of the reference audio, and recording the amplitude of the reference audio which can be heard at the moment as a reference amplitude A0;
s4: adjusting the amplitude of the reference audio to make the corresponding amplitude be marked as A0' when the playing loudness of the reference audio is increased by a;
s5: selecting a control ear; selecting a pure tone with the frequency of F0 as a test audio;
adjusting the amplitude of the test audio to enable a user to feel that the loudness of the test audio played by a control ear is equal to the loudness of a reference audio with the amplitude of A0', and marking the amplitude of the test audio corresponding to the control ear at the moment as Ac;
s6: acquiring a frequency point to be calibrated in the frequency range of the reference frequency F0;
setting the frequency points to be calibrated comprises: fn, F1, F2..;
wherein n is a natural number and is the number of frequency points to be calibrated;
s7: based on the equal loudness curve above the hearing threshold a, calculating and obtaining the sound intensity difference value when the pure tone of each frequency point to be calibrated is equal to the pure tone of the reference frequency F0, and recording as follows: d1, d2, …, dn;
s8: calculating the amplitudes of the pure tone corresponding to the frequency point to be calibrated and the pure tone of the reference frequency F0 when the loudness of the pure tone and the pure tone is equal, and respectively recording as follows: a1, a2.. An;
s9: playing a pure tone with amplitude Ac and frequency F0 to the control ear;
s10: playing the pure tone audio to be calibrated of the frequency point to be calibrated to the test ear;
when the audio to be calibrated is played, setting the initial amplitude to be A0';
in the playing process, adjusting the amplitude of the audio to be calibrated until the loudness felt by the reference ear and the loudness felt by the test ear are equal, recording the corresponding pure tone amplitude of the frequency point to be calibrated as the calibrated amplitude;
the calibrated amplitude corresponding to the audio to be calibrated of the frequency point to be calibrated is as follows: a1 ', a2 ', …, An ';
s11: respectively compensating the gain output in the frequency range near the frequency point to be calibrated corresponding to each audio frequency to be calibrated, wherein the compensated gain is as follows:
20log(A1’-A1)，
20log(A2’- A2)，…，
20log(An’- An)；
and then, obtaining the corresponding frequency response calibration value of the test ear on the audio output device and the audio playing device.
2. The method for calibrating frequency response of a playback device of claim 1, wherein: it also includes the following steps:
s12: determining whether the playback device frequency response on the other side of the test ear is to be calibrated;
if the adjustment is required, step S13 is executed;
if not, ending the calibration;
s13: setting the other side ear of the test ear as a test ear, and circularly executing the steps S2-S11;
s14: simultaneously and respectively playing pure tones with the frequency of F0 to the ears on the two sides, and adjusting the amplitude of the pure tones of the left ear and the right ear to ensure that the loudness of the left ear and the right ear is equal;
at this time, the corresponding two output gains are the corresponding frequency response calibration values of the ears on the audio output equipment and the audio playing equipment;
and finishing the calibration.
3. The method for calibrating frequency response of a playback device of claim 1, wherein: the control ear may be the test ear or the other lateral ear.
4. The method for calibrating frequency response of a playback device of claim 1, wherein: the values of F1, F2... Fn in the frequency points to be calibrated are:
125Hz、250Hz、500Hz、1000Hz、2000Hz、3000Hz、4000Hz、5000Hz、6000Hz、7000Hz、8000Hz、9000Hz、10000Hz。
5. the method for calibrating frequency response of a playback device of claim 1, wherein: in step S14, the following are set: the amplitude of the pure tone of the left ear is Al, the amplitude of the pure tone of the right ear is Ar, and the method for enabling the loudness of the left ear and the loudness of the right ear to be equal comprises the following steps:
increase the output gain of the left ear by 20log (Al-Ar) dB
Or increase the right ear output by 20log (Ar-Al) dB.
6. The method for calibrating frequency response of a playback device of claim 1, wherein: the frequency range of the reference frequency F0 is: f0 is more than or equal to 125Hz and less than or equal to 10000 Hz.
7. The method for calibrating frequency response of a playback device of claim 1, wherein: in step S4, the value range of the loudness increase value a is: a is more than or equal to 5dB and less than or equal to 100 dB;
in step S8, a1 and a2.. An are calculated by:
A1= A0’*10^(d1/20)；
A 2= A0’*10^(d1/20),
…
A n= A0’*10^(dn/20) 。
8. the method for calibrating frequency response of a playback device of claim 1, wherein: in step S11, the method for increasing the gain output in the frequency range near the frequency point to be calibrated includes:
the frequency point to be calibrated comprises: fn, F1, F2..;
setting two adjacent frequency points as Fi-1 and Fi, wherein i is more than or equal to 2 and less than or equal to n;
if the Fi-1 frequency range is (f 1, f 2) and the Fi frequency range is (f 2, f 3), the following are:
f1< Fi-1<f2< Fi <f3
the continuous frequency between f1 and f2 is the frequency in the range near the frequency point to be calibrated by taking Fi-1 as the frequency point to be calibrated, and the increasing gain is obtained by calculating the gain required to be increased at the position of the Fi-1;
the continuous frequency between f2 and f3 is the frequency in the range near the frequency point to be calibrated by Fi, and the increased gain is obtained according to the gain calculation needing to be increased at the Fi.
9. The method for calibrating frequency response of a playback device of claim 1, wherein: the audio output device includes: power amplifier equipment, earphone.
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| US20170083279A1 (en) * | 2014-09-09 | 2017-03-23 | Sonos, Inc. | Facilitating Calibration of an Audio Playback Device |
| US9497530B1 (en) * | 2015-08-31 | 2016-11-15 | Nura Holdings Pty Ltd | Personalization of auditory stimulus |
| CN109040885A (en) * | 2017-06-09 | 2018-12-18 | 中国科学院声学研究所 | A kind of personalized loudness compensation method and system for headphone equalization based on volume |
| CN108209934A (en) * | 2018-01-11 | 2018-06-29 | 清华大学 | Hearing sensitivity detecting system based on frequency of stimulation otoacoustic emission |
| CN113613121A (en) * | 2021-03-16 | 2021-11-05 | 深圳市冠旭电子股份有限公司 | Method and device for obtaining sound pressure level of earphone and earphone |
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