CN110784792B - Processing method for local mutation generated by EQ calibration - Google Patents
Processing method for local mutation generated by EQ calibration Download PDFInfo
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- CN110784792B CN110784792B CN201910942460.9A CN201910942460A CN110784792B CN 110784792 B CN110784792 B CN 110784792B CN 201910942460 A CN201910942460 A CN 201910942460A CN 110784792 B CN110784792 B CN 110784792B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1058—Manufacture or assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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Abstract
The invention relates to the technical field of frequency response compensation, in particular to a processing method for local mutation generated by EQ calibration, which comprises the steps of firstly, preliminarily calibrating a frequency response curve by an EQ balance debugging algorithm; then, the sound pressure level of the frequency response curve and the sound pressure level of the target curve at the same frequency are subjected to difference, and the absolute value of the difference is taken; taking root mean square of absolute values of all sound pressure level difference values of all the areas, and comparing the root mean square with a set threshold value: if the root mean square of the area to be detected is larger than the threshold value, smoothing the frequency response curve of the area; then comparing the root mean square of other areas with a threshold; if the root mean square of the area to be detected is smaller than or equal to the threshold, comparing the root mean square of other areas with the threshold; repeating the steps S1 and S2 until the whole frequency response curve is judged, and finishing the processing of all abnormal areas; the invention solves the problem of local sudden change of the frequency response curve caused by local overcompensation in EQ calibration and improves the sound quality of the earphone.
Description
Technical Field
The invention relates to the technical field of frequency response compensation, in particular to a processing method for local mutation generated by EQ calibration.
Background
Along with the improvement of aesthetic and travel requirements of people, the requirements of people on the wireless earphones are increasingly strengthened, the requirement on subjective auditory perception is improved, the tone quality consistency of the left ear and the right ear is particularly important, and the consistency of the left ear and the right ear is difficult to guarantee due to the complex production process of the wireless earphones. In the prior art, the consistency of the left ear and the right ear of the earphone is ensured through grading, but the problem of product accumulation caused by the fact that the gears of the left ear and the right ear are different greatly and the problem of poor consistency caused by local abnormity of a curve after the left ear and the right ear are matched with the gears exists. Therefore, EQ calibration comes along, and EQ calibration can improve product consistency, for example, chinese CN201910536621.4 discloses a method and system for reducing noise of wireless headphones, and a wireless headphones and a computer readable storage medium, where the method includes: acquiring first environmental noise acquired by a left ear earphone and second environmental noise acquired by a right ear earphone; performing frequency response analysis on the first environmental noise and the second environmental noise to obtain a balance curve; and calculating a first EQ compensation parameter corresponding to the first environmental noise and a second EQ compensation parameter corresponding to the second environmental noise according to the balance curve, so that the left ear earphone utilizes the first EQ compensation parameter and the right ear earphone utilizes the second EQ compensation parameter to perform noise reduction processing, and the gain balance of the left ear and the right ear of the wireless earphone is realized.
But for some product curves where there are locally narrow and deep valleys or narrow and high peaks, the EQ calibration suffers from over-compensation problems. The conventional EQ calibration does not process the problem of excessive compensation, so that the frequency response curve of a product is locally mutated, the subjective auditory perception of the product is changed, and the tone quality of the product is influenced.
Disclosure of Invention
The invention aims to provide a processing method for local mutation generated by EQ calibration, which aims to solve the problem of local mutation of a frequency response curve caused by local over-compensation in the EQ calibration in the prior art and improve the sound quality of a wireless earphone.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method of processing EQ calibrations to produce localized mutations, comprising the steps of:
(1) preliminarily calibrating the frequency response curve by an EQ balance debugging algorithm;
(2) comparing the preliminarily calibrated frequency response curve with a target curve, subtracting the sound pressure levels of the two curves at the same frequency, and taking the absolute value of the difference;
(3) setting a bandwidth and a threshold, taking a root mean square of absolute values of all sound pressure level differences of each area, and comparing the root mean square of all the sound pressure level differences of each area with the set threshold respectively:
s1, if the root mean square of the area to be detected is larger than the threshold value, the area is judged to be an abnormal area, and the frequency response curve of the abnormal area is smoothed by reducing the frequency resolution of the abnormal area; then, taking root mean square of absolute values of all the sound pressure level difference values of other areas, and comparing the absolute values with a threshold value;
s2, if the root mean square of the area to be detected is smaller than or equal to the threshold, taking the root mean square of the absolute values of the sound pressure level difference values of other areas, and comparing the absolute values with the threshold;
(4) and repeating the steps S1 and S2 until the whole frequency response curve is judged, and finishing the processing of all abnormal areas.
Preferably, in step S1, after the frequency response curve of the abnormal region is smoothed, the end point of the previous region is used as the start point of the new region, the end point is moved backward by one point, and the absolute value of the sound pressure level difference of all the adjacent next regions is taken as the root mean square and compared with the threshold.
Preferably, in step S2, if the root mean square of the region to be detected is less than or equal to the threshold, the end point of the region is set as the starting point of the next region, the end point of the next region is moved backward by one point, and the absolute value of the sound pressure level difference of all adjacent next regions is taken as the root mean square and compared with the threshold.
Preferably, each region in step (3) is divided by frequency bands, and each frequency band is a region.
Preferably, a fixed bandwidth is maintained throughout the steps S1 and S2, the bandwidth is 1/3 octave of bandwidth, or 1 octave of bandwidth, and the present invention does not limit the bandwidth.
Preferably, the threshold is a specific value or a value interval, and the value size or the range of the value interval needs to be defined according to specific data of a specific product.
Preferably, the EQ equalization debugging algorithm in step (1) is used to perform corresponding up-or down-adjustment on the frequency response curve of the region where the difference exists, so that the frequency response curve is fitted to be consistent with the trend of the target curve, and the frequency response curve is preprocessed.
Preferably, the preliminary calibration in step (1) is an overall trend calibration of the frequency response curve.
The abscissa of the frequency response curve described in this embodiment represents frequency (Hz) and the ordinate represents sound pressure level (dB).
The invention has the technical effects that:
compared with the prior art, the invention has the beneficial effects that: the method solves the problem of local sudden change of the frequency response curve caused by local excessive compensation in EQ calibration, and improves the sound quality of the earphone; meanwhile, the consistency of left and right ear test curves can be improved, the product test yield is improved, and the problem that left and right ears are difficult to pair is solved.
Drawings
FIG. 1 is a graph of frequency response before and after calibration of an overcompensation product according to a calibration process of the present invention;
FIG. 2 is a graph of frequency response before and after processing for the EQ calibration of the present invention to generate local mutations.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Example one
A processing method for generating local mutation by EQ calibration specifically comprises the following steps:
(1) performing primary overall trend calibration on the frequency response curve through an EQ (equalization) debugging algorithm, and performing corresponding up-regulation or down-regulation on the frequency response curve of the regions with differences to fit the frequency response curve to be consistent with the trend of a target curve, so as to realize the pretreatment of the frequency response curve;
(2) comparing the frequency response curve after the preliminary overall trend calibration with a target curve, subtracting the sound pressure levels of the two curves at the same frequency, and taking the absolute value of the difference;
(3) setting a fixed bandwidth and a proper threshold, taking 1/3 octave bandwidth and 20Hz as starting points as examples, taking root mean square of absolute values of all sound pressure level differences of each frequency band in 1/3 octave bandwidth, and comparing the root mean square of the sound pressure level differences of each frequency band with the set threshold respectively:
s1, if the root mean square of the first frequency band is larger than the threshold, the area is judged to be an abnormal area, and the frequency response curve of the abnormal area is smoothed by reducing the frequency resolution of the abnormal area, for example, the original frequency resolution is N, and the reduced frequency resolution can be N-1, N-2, N-3, etc.; keeping the fixed bandwidth unchanged, then taking the root mean square of the absolute values of all the sound pressure level difference values of the next adjacent frequency band, and comparing the root mean square with a threshold value;
s2, if the root mean square of the first frequency band is less than or equal to the threshold, maintaining the fixed bandwidth unchanged, taking the root mean square of the absolute values of all the sound pressure level difference values of the next adjacent frequency band, and comparing the absolute values with the threshold;
(4) and repeating the steps S1 and S2 until the whole frequency response curve is judged, and finishing the processing of all abnormal areas.
Preferably, the bandwidth may also be a 1 octave bandwidth, and the bandwidth is not limited in the present invention.
Preferably, the threshold is a specific value or a value interval, and the value size or the range of the value interval needs to be defined according to specific data of a specific product.
The abscissa of the frequency response curve described in this embodiment represents frequency (Hz) and the ordinate represents sound pressure level (dB).
As shown in fig. 1, the conventional EQ calibration has the problem of over-compensation, and as shown in fig. 2, the problem of local sudden change caused by the EQ over-compensation is processed through the above steps, so that the processed abnormal area curve becomes smooth without abnormal convex peaks, and a good sound quality effect is obtained.
In summary, the embodiments of the present invention are merely exemplary and should not be construed as limiting the scope of the invention. All equivalent changes and modifications made according to the content of the claims of the present invention should fall within the technical scope of the present invention.
Claims (10)
1. A processing method for generating local mutation by EQ calibration is characterized by comprising the following steps:
(1) preliminarily calibrating the frequency response curve by an EQ balance debugging algorithm;
(2) comparing the preliminarily calibrated frequency response curve with a target curve, subtracting the sound pressure levels of the two curves at the same frequency, and taking the absolute value of the difference;
(3) setting a bandwidth and a threshold, taking a root mean square of absolute values of all sound pressure level differences of each area, and comparing the root mean square of all the sound pressure level differences of each area with the set threshold respectively:
s1, if the root mean square of the area to be detected is larger than the threshold value, the area is judged to be an abnormal area, and the frequency response curve of the abnormal area is smoothed by reducing the frequency resolution of the abnormal area; then, taking root mean square of absolute values of all the sound pressure level difference values of other areas, and comparing the absolute values with a threshold value;
s2, if the root mean square of the area to be detected is smaller than or equal to the threshold, taking the root mean square of the absolute values of the sound pressure level difference values of other areas, and comparing the absolute values with the threshold;
(4) and repeating the steps S1 and S2 until the whole frequency response curve is judged, and finishing the processing of all abnormal areas.
2. The method for processing the EQ alignment that produces local sudden changes according to claim 1, wherein in step S1, after smoothing the frequency response curve of the abnormal region, the absolute value of the difference between all the sound pressure levels of the adjacent next region is taken as the root mean square and compared with the threshold.
3. The method for processing EQ calibration result in local abrupt change according to claim 1, wherein in step S2, if the root mean square of the region to be detected is less than or equal to the threshold, the absolute value of all the sound pressure level difference values of the next adjacent region is taken as the root mean square and compared with the threshold.
4. The method as claimed in claim 1 wherein the regions in step (3) are divided into frequency bands, each frequency band being a region.
5. The method for processing EQ calibration with local sudden changes according to claim 1, wherein the fixed bandwidth is maintained throughout the steps S1 and S2, wherein the bandwidth is 1/3 octaves or 1 octave.
6. The method of claim 1 wherein the threshold is a specific value or a range of values.
7. The method for processing the EQ calibration with the local sudden change according to the claim 1, wherein the EQ equalization debugging algorithm in the step (1) is used to adjust the frequency response curve of the regions with the difference up or down, so that the frequency response curve is fitted to be consistent with the trend of the target curve, thereby realizing the preprocessing of the frequency response curve.
8. The process for EQ calibration to generate local sudden changes as claimed in claim 1 wherein the preliminary calibration of step (1) is an overall trend calibration of the frequency response curve.
9. A wireless headset comprising means to implement the processing method steps of EQ calibration resulting in local discontinuities according to any of claims 1-8.
10. An electronic device comprising means to implement the processing method steps of EQ calibration for local mutation according to any of claims 1-8.
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| CN111356064A (en) * | 2020-03-12 | 2020-06-30 | 广州天逸电子有限公司 | EQ parameter generation method adaptive to real-time frequency response curve |
| CN111628834B (en) * | 2020-04-08 | 2022-03-25 | 成都芯通软件有限公司 | EQ calibration and configuration method for multi-band HFC equipment |
| CN113949968B (en) * | 2021-09-07 | 2024-10-01 | 万魔声学股份有限公司 | A frequency response correction method, electronic equipment and signal processing method |
| CN114827839B (en) * | 2022-03-09 | 2024-12-20 | 湖北星纪魅族科技有限公司 | Stereo balance adjustment method and device |
| CN114760567B (en) * | 2022-04-26 | 2023-07-14 | 歌尔股份有限公司 | Calibration method, device, equipment and storage medium for earphone sound quality effect |
| CN115665621A (en) * | 2022-05-19 | 2023-01-31 | 深圳市美格信测控技术有限公司 | Earphone online frequency response equalization method, system, computer equipment and storage medium |
| CN116364110B (en) * | 2023-03-03 | 2026-03-06 | 伟光有限公司 | Sound pressure level calibration methods, devices, equipment, chips, and storage media |
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| CN105764008A (en) * | 2016-04-27 | 2016-07-13 | 广州大学 | Method and apparatus for debugging transmission frequency characteristic of acoustic amplification system |
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