CN116437279A - Earphone speaker calibration method and device, terminal equipment and storage medium - Google Patents
Earphone speaker calibration method and device, terminal equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention discloses a loudspeaker calibration method, a device, terminal equipment and a computer readable storage medium of an earphone, wherein the method calculates a first frequency response curve based on recorded sound signals played by a loudspeaker of the earphone to be measured; calculating a first calibration filter parameter based on a difference between the first frequency response curve and the standard frequency response curve; writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filtering parameters. The invention realizes the speaker calibration of the earphone by determining the filter parameters, thereby improving the success rate of the calibration of the speaker of the earphone.
Description
Technical Field
The invention belongs to the technical field of earphone audio, and particularly relates to a loudspeaker calibration method and device of an earphone, terminal equipment and a computer readable storage medium.
Background
With the rapid development of technology, wireless headphones are commonly used in people's life, and TWS headphones are also being updated continuously.
At present, when the TWS (True Wireless Stereo, real wireless stereo) noise reduction earphone SPK (statistical process control, loudspeaker) is calibrated in a production line, the main method is to conduct frequency response analysis on sound emitted by the recorded product SPK, judge whether the sound can be calibrated through a threshold, calibrate the product SPK through a calibration algorithm when the judgment result is that the sound can be calibrated, write calibration parameters into a register of the earphone to be tested, and then compare the calibrated product SPK frequency response curve with a target frequency response curve to judge whether the sound is calibrated to be qualified or not.
Disclosure of Invention
The invention mainly aims to provide a loudspeaker calibration method, device, terminal equipment and computer readable storage medium of a headset. The method aims at providing a scheme for calibrating the loudspeaker of the earphone by determining the parameters of the filter so as to improve the success rate of calibrating the loudspeaker of the earphone.
In order to achieve the above object, the present invention provides a speaker calibration method of an earphone, including:
calculating a first frequency response curve based on the recorded sound signals played by the earphone speaker to be tested;
Calculating a first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve;
writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filtering parameters.
Optionally, after the step of calculating the first calibration filtering parameter based on the difference between the first frequency response curve and the standard frequency response curve, the method further includes:
taking the first frequency response curve as a target frequency response curve, taking the first calibration filter parameter as a target calibration filter parameter, and correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
judging whether a preset filtering cycle ending condition is reached;
if yes, ending the filtering cycle;
if not, calculating a second calibration filter parameter based on the difference value between the corrected frequency response curve and the standard frequency response curve, taking the corrected frequency response curve as the target frequency response curve, taking the second calibration filter parameter as the target calibration filter parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
Writing the second calibration filtering parameters calculated in each round of filtering cycle into the earphone to be tested, so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the second calibration filtering parameters.
Optionally, the step of calculating the first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve includes:
determining a first amplitude-frequency characteristic curve based on the difference between the first frequency response curve and the standard frequency response curve;
and calculating a first calibration filter parameter based on the first amplitude-frequency characteristic curve.
Optionally, the step of calculating the first calibration filter parameter based on the first amplitude-frequency characteristic includes:
determining absolute values of all extreme values which are not in the preset extreme value range on the first amplitude-frequency characteristic curve based on the preset extreme value range;
and determining an extremum corresponding to the largest absolute value in the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the target extremum.
Optionally, the step of calculating the first calibration filter parameter based on the target extremum comprises:
taking the frequency point where the target extremum is located as the center frequency of the filter;
Taking the amplitude of the target extremum as a filter amplitude;
multiplying the maximum absolute value by a preset duty ratio to obtain a target value, and taking a frequency point corresponding to an absolute value with the smallest difference from the target value in the absolute values as a filter bandwidth;
calculating a filter quality factor based on the filter center frequency and the filter bandwidth;
the filter center frequency, the filter magnitude and the filter quality factor are taken as first calibration filtering parameters.
Optionally, after the step of filtering the sound signal to be played by the speaker based on the first calibration filtering parameter, the method further includes:
calculating a third frequency response curve based on the recorded filtered sound signals played by the earphone to be tested;
determining a second amplitude-frequency characteristic curve based on the difference between the third frequency response curve and the standard frequency response curve;
and when each extreme value of the second amplitude-frequency characteristic curve is in the preset extreme value range, determining that the calibration result is successful.
Optionally, the step of calculating the first frequency response curve based on the recorded sound signal played by the speaker of the earphone to be tested includes:
And converting the recorded sound signal played by the earphone speaker to be tested into a digital signal, and carrying out Fourier transform on the digital signal to obtain a first frequency response curve.
In addition, in order to achieve the above object, the present invention also provides a speaker calibration device for an earphone, including:
the first frequency response curve module is used for calculating a first frequency response curve based on the recorded sound signals played by the earphone speaker to be tested;
the first calibration filtering parameter module is used for calculating a first calibration filtering parameter based on the difference value between the first frequency response curve and the standard frequency response curve;
and the calibration module is used for writing the calculated first calibration filtering parameters into the earphone to be tested so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the first calibration filtering parameters.
In addition, to achieve the above object, the present invention also provides a terminal device including: the method comprises the steps of a memory, a processor and a speaker calibration program of the earphone stored in the memory and capable of running on the processor, wherein the speaker calibration program of the earphone of the terminal device is executed by the processor to realize the speaker calibration method of the earphone.
In addition, to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a speaker calibration program of an earphone, which when executed by a processor, implements the steps of the speaker calibration method of an earphone as described above.
The embodiment of the invention provides a loudspeaker calibration method, a device, terminal equipment and a computer readable storage medium of an earphone, wherein the method calculates a first frequency response curve based on recorded sound signals played by a loudspeaker of the earphone to be measured; calculating a first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve; writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filtering parameters.
According to the embodiment of the invention, the first frequency response curve corresponding to the sound signal is calculated based on the recorded sound signal played by the earphone to be tested through the calibration test system, then the first calibration filter parameter of the earphone to be tested is calculated based on the difference value of the first frequency response curve and the standard frequency response curve, and finally the calculated first calibration filter parameter is written into the earphone to be tested so that the earphone to be tested can filter the sound signal to be played by the loudspeaker based on the first calibration filter parameter. In this way, the invention provides a scheme for calibrating the loudspeaker of the earphone by determining the parameters of the filter, so as to improve the success rate of calibrating the loudspeaker of the earphone.
Drawings
FIG. 1 is a schematic device architecture diagram of a hardware operating environment of a terminal device according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a first embodiment of a method for calibrating a speaker of an earphone according to the present invention;
fig. 3 is a schematic hardware structure diagram of a calibration test system according to an embodiment of a speaker calibration method of an earphone of the present invention;
FIG. 4 is a diagram of peak filter function images according to an embodiment of a method of calibrating a speaker of an earphone of the present invention;
FIG. 5 is a schematic diagram of a notch filter function according to an embodiment of a method for calibrating a speaker of an earphone of the present invention;
fig. 6 is a schematic diagram of a speaker calibration flow of an earphone according to an embodiment of a speaker calibration method of the earphone of the present invention.
Fig. 7 is a schematic functional block diagram of a speaker calibration apparatus of an earphone according to an embodiment of the invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic device structure diagram of a hardware running environment of a terminal device according to an embodiment of the present invention.
It should be noted that, in the embodiment of the present invention, the terminal device integrated with the calibration test system may be a device such as an earphone, a smart phone, a personal computer, a server, and the like, which is not limited herein.
As shown in fig. 1, the terminal device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a DiSplay (diselay), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the terminal device structure shown in fig. 1 is not limiting of the terminal device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a speaker calibration program of the headset may be included in a memory 1005 as one type of computer storage medium.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client and communicating data with the client; and the processor 1001 may be configured to call a speaker calibration program of the headset stored in the memory 1005 and perform the following operations:
calculating a first frequency response curve based on the recorded sound signals played by the earphone speaker to be tested;
calculating a first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve;
writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filtering parameters.
Further, after the step of calculating the first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve, the processor 1001 may be further configured to invoke a speaker calibration program of the earphone stored in the memory 1005 to perform the following operations:
Taking the first frequency response curve as a target frequency response curve, taking the first calibration filter parameter as a target calibration filter parameter, and correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
judging whether a preset filtering cycle ending condition is reached;
if yes, ending the filtering cycle;
if not, calculating a second calibration filter parameter based on the difference value between the corrected frequency response curve and the standard frequency response curve, taking the corrected frequency response curve as the target frequency response curve, taking the second calibration filter parameter as the target calibration filter parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
writing the second calibration filtering parameters calculated in each round of filtering cycle into the earphone to be tested, so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the second calibration filtering parameters.
Further, the operation of calculating the first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve includes:
Determining a first amplitude-frequency characteristic curve based on the difference between the first frequency response curve and the standard frequency response curve;
and calculating a first calibration filter parameter based on the first amplitude-frequency characteristic curve.
Further, the operation of calculating the first calibration filtering parameter based on the first amplitude-frequency characteristic includes:
determining absolute values of all extreme values which are not in the preset extreme value range on the first amplitude-frequency characteristic curve based on the preset extreme value range;
and determining an extremum corresponding to the largest absolute value in the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the target extremum.
Further, the operation of calculating the first calibration filter parameter based on the target extremum includes:
taking the frequency point where the target extremum is located as the center frequency of the filter;
taking the amplitude of the target extremum as a filter amplitude;
multiplying the maximum absolute value by a preset duty ratio to obtain a target value, and taking a frequency point corresponding to an absolute value with the smallest difference from the target value in the absolute values as a filter bandwidth;
calculating a filter quality factor based on the filter center frequency and the filter bandwidth;
The filter center frequency, the filter magnitude and the filter quality factor are taken as first calibration filtering parameters.
Further, after the step of filtering the sound signal to be played by the speaker by the to-be-tested earphone based on the first calibration filtering parameter, the processor 1001 may be further configured to invoke a speaker calibration program of the to-be-tested earphone stored in the memory 1005, to perform the following operations:
calculating a third frequency response curve based on the recorded filtered sound signals played by the earphone to be tested;
determining a second amplitude-frequency characteristic curve based on the difference between the third frequency response curve and the standard frequency response curve;
and when each extreme value of the second amplitude-frequency characteristic curve is in the preset extreme value range, determining that the calibration result is successful.
Further, the operation of calculating the first frequency response curve based on the recorded sound signal played by the speaker of the earphone to be measured includes:
and converting the recorded sound signal played by the earphone speaker to be tested into a digital signal, and carrying out Fourier transform on the digital signal to obtain a first frequency response curve.
Based on the above-described structure, various embodiments of a speaker calibration method of an earphone are presented.
Referring to fig. 2, fig. 2 is a flowchart illustrating a speaker calibration method for an earphone according to a first embodiment of the present invention. It should be noted that although a logical sequence is shown in the flow chart, in some cases the speaker calibration method of the earphone of the present invention may of course perform the steps shown or described in a different order than here. In this embodiment, the execution body of the speaker calibration method of the earphone may be a personal computer, a smart phone, or other devices, but the present embodiment is not limited thereto, and for convenience of description, the execution body is omitted from description of each embodiment. In this embodiment, the method for calibrating a speaker of the earphone includes:
step S10: calculating a first frequency response curve based on the recorded sound signals played by the earphone speaker to be tested;
based on the recorded earphone to be tested, playing the sound signal for testing, and determining a frequency response curve (hereinafter referred to as a first frequency response curve to show distinction) corresponding to the sound signal.
In a possible implementation manner, when the test tool part of the hardware part of the calibration test system is used for testing, the SPK of the earphone to be tested firstly utilizes the earphone equalizer to enable to emit a sound signal, and then a frequency response curve, namely a first frequency response curve, is determined through the main control machine according to the sound signal.
In a possible implementation manner, before the sound signal used for testing is recorded and played by the earphone to be tested, the A2DP Bluetooth connection is established with the earphone to be tested through the Bluetooth adapter, the Bluetooth adapter plays the sinusoidal sweep signal with the frequency of 20Hz-20KHz, the minimum period of 10 periods and the duration of the minimum period of 10ms of 1/12 octave through the loudspeaker of the earphone to be tested, and the recorded sinusoidal sweep signal played by the earphone to be tested is the sound signal used for testing and calibrating.
Further, in a possible embodiment, the step S10 includes:
step S101, converting the recorded sound signals played by the earphone speaker to be tested into digital signals, and carrying out Fourier transform on the digital signals to obtain a first frequency response curve.
And converting the sound signal played by the earphone speaker to be tested, which is recorded by the standard microphone, into a digital signal, and performing Fourier transformation on the digital signal to obtain a first frequency response curve.
In a possible implementation manner, the standard microphone is located at a test tool part of the hardware part of the calibration test system, the standard microphone is used for replacing a human ear to record a test sound signal played by an earphone to be tested, after the standard microphone records the sound signal sent by the earphone to be tested, the sound signal is sent to the test amplifier, the test amplifier converts the received sound signal to obtain a digital signal corresponding to the sound signal, the test amplifier sends the digital signal obtained by processing the sound signal to a sound card of the industrial personal computer, and the sound card receives the digital signal to be used for carrying out Fourier analysis on the digital signal by the industrial personal computer, so that a frequency response Curve FR_Curve1, namely a first frequency response Curve, is obtained.
In a possible implementation manner, as shown in fig. 3, the hardware part of the calibration test system is composed of an industrial personal computer, a standard microphone, a test amplifier, a sound card, a bluetooth adapter and the like, specifically, the industrial personal computer provides a USB interface to connect with the bluetooth adapter, and the bluetooth adapter is connected with the earphone to be tested through the bluetooth adapter, and the bluetooth adapter is used for playing sine sweep signals and playing through the SPK of the earphone to be tested; the test tool consists of the earphone to be tested and the standard wheat, wherein the standard wheat is used for recording the sound signal played by the SPK of the earphone to be tested; the test fixture and the Bluetooth adapter are positioned in the audio shielding box, the standard wheat is connected with the input end of the test amplifier, the test amplifier comprises a left input end and a right input end and a left output end, the output end of the test amplifier is connected with the sound card of the industrial personal computer, the test amplifier is used for converting sound signals received by the left input end and the right input end and recorded by the standard wheat into digital signals, the left output end and the right output end are used for transmitting the digital signals to the sound card of the main control computer, and the main control computer performs calculation processing according to the digital signals received by the sound card.
Step S20, calculating a first calibration filtering parameter based on the difference value between the first frequency response curve and the standard frequency response curve;
according to the difference between the first frequency response curve and the standard frequency response curve, a calibration filter parameter (hereinafter referred to as a first calibration filter parameter for distinguishing) of a filter of the earphone to be tested is calculated.
It should be noted that, the earphone to be measured includes a plurality of peak filters and notch filters for calibrating the earphone speaker, the number of the two filters is the number of filters included in the earphone chip, the function curve corresponding to the peak filters is shown in fig. 4, the function curve corresponding to the notch filters is shown in fig. 5, where the peak filters are usually used for retaining or gaining specific frequency components, and the notch filters are usually used for removing or weakening specific frequency components, so that the SPK of the earphone can be adjusted and calibrated.
In a possible implementation manner, the main control computer calculates the filter parameters of the current filter according to the first frequency response curve corresponding to the sound signal played by the earphone to be tested, wherein the first calibration filter parameter represents the calibration filter parameters of the current filter because the parameters of the current filter are determined firstly and the parameters of the next filter are required to be determined by the parameters of the current filter when the parameters of each filter are determined.
Step S30, writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filtering parameters.
Writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the first calibration filtering parameters, and the effect of calibrating the loudspeaker of the earphone is achieved.
In a possible implementation manner, the calibration filtering parameter of a filter in the earphone to be tested is written into a register of the earphone to be tested, and the earphone SPK is automatically calibrated according to the parameter of the filter in the register.
In the embodiment, the loudspeaker calibration method of the earphone of the invention converts the sound signal played by the earphone loudspeaker to be tested, which is recorded by the standard microphone, into a digital signal, and performs Fourier transform on the digital signal to obtain a first frequency response curve; calculating a calibration filtering parameter of a filter of the earphone to be measured according to the difference value of the first frequency response curve and the standard frequency response curve; writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the first calibration filtering parameters, and the effect of calibrating the loudspeaker of the earphone is achieved.
In this way, the embodiment of the invention calculates the first frequency response curve corresponding to the sound signal based on the recorded sound signal played by the earphone to be tested through the calibration test system, then calculates the first calibration filter parameter of the earphone to be tested based on the difference value between the first frequency response curve and the standard frequency response curve, and finally writes the calculated first calibration filter parameter into the earphone to be tested so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filter parameter. In this way, the invention provides a scheme for calibrating the loudspeaker of the earphone by determining the parameters of the filter, so as to improve the success rate of calibrating the loudspeaker of the earphone.
Further, based on the first embodiment of the speaker calibration method of the earphone of the present invention described above, a second embodiment of the speaker calibration method of the earphone of the present invention is proposed.
In this embodiment, after the step S20, the method for calibrating a speaker of the earphone of the present invention further includes:
a10, taking the first frequency response curve as a target frequency response curve, taking the first calibration filter parameter as a target calibration filter parameter, and correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
and taking the first frequency response curve as a target frequency response curve, taking the first calibration filter parameter as a target calibration filter parameter, and carrying out filter correction on the target frequency response curve according to the target calibration filter parameter to obtain a corrected frequency response curve after the filter correction.
In a possible implementation manner, the first frequency response curve is theoretically corrected based on the filter parameter of the current filter, that is, the first calibration filter parameter, and specifically, if the current filter is a notch filter, a specific frequency component in the first frequency response curve is weakened according to the parameter of the notch filter, so that a corrected frequency response curve, that is, a corrected frequency response curve, is obtained.
Step A20, judging whether a preset filtering cycle ending condition is reached;
judging whether a preset filtering cycle ending condition is reached.
It should be noted that, the preset filtering cycle end condition is that parameters of all filters of the earphone to be tested are calculated or the corrected frequency response curve meets a calibration requirement, where the calibration requirement is that a difference between the corrected frequency response curve and the standard frequency response curve is within a preset range, and the preset range is a preset extremum range mentioned below.
It should be noted that the present invention does not limit the range of the difference between the corrected frequency response curve and the standard frequency response curve in the calibration requirement.
And step A30, if yes, ending the filtering cycle.
Ending the filtering cycle if the preset filtering cycle ending condition is reached currently;
step A40, if not, calculating a second calibration filter parameter based on the difference value between the corrected frequency response curve and the standard frequency response curve, taking the corrected frequency response curve as the target frequency response curve, taking the second calibration filter parameter as the target calibration filter parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
If the preset filter cycle end condition is not met, calculating a calibration filter parameter (hereinafter referred to as a second calibration filter parameter for distinguishing) of another calibration filter based on the difference between the correction frequency response curve and the standard frequency response curve, taking the correction frequency response curve obtained by filtering correction as a target frequency response curve, taking the second calibration filter parameter as a target calibration filter parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filter parameter to obtain a correction frequency response curve.
In a possible implementation manner, according to the corrected frequency response curve after one correction, the filter parameter of the next filter is calculated, and it can be understood that the first frequency response curve is determined according to the sound signal emitted by the earphone to be measured, and can be regarded as an original frequency response curve, the parameter of one filter is determined according to the original frequency response curve, the original frequency response curve is corrected according to the parameter, and then the parameter of the next filter, namely, the second calibration filter parameter, is determined according to the corrected frequency response curve.
And step A50, writing the second calibration filtering parameters calculated in each round of filtering cycle into the earphone to be tested, so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the second calibration filtering parameters.
After the filtering cycle is finished, writing the second calibration filtering parameters obtained by respective calculation of each round of filtering cycle into a register of the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the second calibration filtering parameters.
In this embodiment, the speaker calibration method of the earphone of the present invention uses the first frequency response curve as a target frequency response curve, uses the first calibration filtering parameter as a target calibration filtering parameter, and performs filtering correction on the target frequency response curve according to the target calibration filtering parameter to obtain a corrected frequency response curve after filtering correction; judging whether a preset filtering cycle ending condition is reached, wherein the preset filtering cycle ending condition is that parameters of all filters of the earphone to be tested are calculated or the corrected frequency response curve meets a calibration requirement, and the calibration requirement is that a difference value between the corrected frequency response curve and a standard frequency response curve is in a preset range, and the preset range is a preset extremum range mentioned below; ending the filtering cycle if the preset filtering cycle ending condition is reached currently; if the preset filter cycle ending condition is not met currently, calculating a second calibration filtering parameter of another calibration filter based on the difference value between the correction frequency response curve and the standard frequency response curve, taking the correction frequency response curve obtained by filtering correction as a target frequency response curve, taking the second calibration filtering parameter as a target calibration filtering parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filtering parameter to obtain a correction frequency response curve; after the filtering cycle is finished, writing the second calibration filtering parameters obtained by respective calculation of each round of filtering cycle into a register of the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the second calibration filtering parameters.
In this way, the original frequency response curve is subjected to theoretical correction once through the parameters of one filter calculated each time, the parameters of the next filter to be calculated are determined by utilizing the corrected frequency response curve, and the calculation is circularly performed in this way, so that the parameters of each filter of the earphone to be measured are determined, and the subsequent calibration of the SPK of the earphone to be measured based on each parameter is facilitated.
Further, based on the first embodiment and/or the second embodiment of the speaker calibration method of the earphone of the present invention described above, a third embodiment of the speaker calibration method of the earphone of the present invention is proposed.
In this embodiment, the step S20 includes:
step S201, determining a first amplitude-frequency characteristic curve based on the difference value between the first frequency response curve and the standard frequency response curve;
a set of amplitude-frequency characteristic curves (hereinafter referred to as first amplitude-frequency characteristic curves to show distinction) is determined based on the difference between the first frequency response curve and the standard frequency response curve.
In one possible implementation, the first amplitude-frequency characteristic Curve golden_fr1 after the theoretical filter cascade is calculated according to the first frequency response Curve fr_curv1 and the standard frequency response Curve Golden, and the calculation formula is as follows: golden_fr1=golden-fr_curve1.
Step S202, calculating a first calibration filter parameter based on the first amplitude-frequency characteristic curve.
And calculating a first calibration filter parameter of the earphone to be measured based on the first amplitude-frequency characteristic curve.
Further, in a possible embodiment, the step S202 includes:
step B10, determining absolute values of all extrema which are not in the preset extremum range on the first amplitude-frequency characteristic curve based on the preset extremum range;
and determining each extreme value of the first amplitude-frequency characteristic curve which is not in the preset extreme value range based on the preset extreme value range of the amplitude-frequency characteristic curve, and calculating the absolute value of each extreme value.
In a possible implementation manner, the preset extremum range of the amplitude-frequency characteristic curve is a range of a difference value between the frequency response curve and the target curve or an extremum range of the amplitude-frequency characteristic curve, when the range of the difference value or the extremum range of the amplitude-frequency characteristic curve is within the preset extremum range, it is determined that the earphone to be measured is calibrated, recalibration is not needed, and when the range of the difference value or the extremum range of the amplitude-frequency characteristic curve exceeds the preset extremum range, the respective absolute value of each extremum of the amplitude-frequency characteristic curve is calculated.
And step B20, determining an extremum corresponding to the largest absolute value in all the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the target extremum.
And determining an extremum corresponding to the largest absolute value in the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the coordinate of the target extremum on the first amplitude-frequency characteristic curve.
In a possible implementation manner, each extremum in the first amplitude-frequency characteristic curve golden_fr1 is calculated by the main control computer, each extremum in the preset extremum range is determined according to the preset extremum range, each extremum in the preset extremum range is sorted according to the descending order of absolute values, and the first extremum is selected as the target extremum.
Further, in a possible embodiment, the operation of "calculating the first calibration filtering parameter based on the target extremum" in the step B20 includes:
step B201, taking a frequency point where the target extremum is located as a filter center frequency;
and determining a frequency point corresponding to the coordinate of the target extremum on the first amplitude-frequency characteristic curve as the center frequency of the current calibration filter.
In one possible embodiment, the abscissa corresponding to the coordinate point of the target extremum on the first amplitude-frequency characteristic curve is a frequency value, and the frequency value is used as the center frequency of the current calibration filter.
Step B202, taking the amplitude of the target extremum as a filter amplitude;
And taking the amplitude corresponding to the target extremum as the filter amplitude of the current calibration filter.
Step B203, multiplying the maximum absolute value by a preset duty ratio to obtain a target value, and taking a frequency point corresponding to an absolute value with the smallest difference from the target value in the absolute values as a filter bandwidth;
multiplying the absolute value closest to the maximum in the absolute values of the extreme values in the first amplitude-frequency characteristic curve by a preset duty ratio to obtain a target value, determining the absolute value which has the smallest difference with the target value in the absolute values of the extreme values in the first amplitude-frequency characteristic curve, and taking the frequency point where the extreme value corresponding to the absolute value is located as the bandwidth of the current calibration filter.
In a possible implementation manner, the nearest maximum absolute value in the absolute values of the extreme values in the first amplitude-frequency characteristic curve is multiplied by 70% to obtain a target value, a coordinate point closest to the extreme value corresponding to the target value is found on the first amplitude-frequency characteristic curve, and the abscissa frequency corresponding to the coordinate point is determined as the bandwidth of the current calibration filter.
It should be noted that, the invention uses the frequency corresponding to the coordinate point of the 1 times of the root number 2 of the target extremum on the amplitude-frequency characteristic curve as the bandwidth of the filter to be calculated for the subsequent calculation of the quality factor of the filter.
Step B204, calculating a filter quality factor based on the filter center frequency and the filter bandwidth;
and calculating the quality factor of the filter according to the determined center frequency of the filter and the filter bandwidth.
Step B205, taking the filter center frequency, the filter amplitude and the filter quality factor as first calibration filtering parameters.
And taking the center frequency of the filter, the amplitude of the filter and the quality factor of the filter as first calibration filtering parameters of the current calibration filter.
In this embodiment, the method for calibrating a speaker of the earphone of the present invention determines a first amplitude-frequency characteristic curve based on a difference between a first frequency response curve and a standard frequency response curve; based on a preset extremum range of the amplitude-frequency characteristic curve, determining each extremum of the first amplitude-frequency characteristic curve which is not in the preset extremum range, and calculating the absolute value of each extremum; determining an extremum corresponding to the largest absolute value in all the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the target extremum; and determining a frequency point corresponding to the coordinate of the target extremum on the first amplitude-frequency characteristic curve as the center frequency of the current calibration filter, taking the amplitude corresponding to the target extremum as the filter amplitude of the current calibration filter, multiplying the nearest maximum absolute value in the absolute values of the extremums in the first amplitude-frequency characteristic curve by a preset duty ratio to obtain a target value, determining the absolute value with the minimum difference from the target value in the absolute values of the extremums in the first amplitude-frequency characteristic curve, taking the frequency point corresponding to the extremum as the bandwidth of the current calibration filter, calculating the quality factor of the filter according to the determined filter center frequency and the determined filter bandwidth, and taking the filter center frequency, the filter amplitude and the filter quality factor as the first calibration filter parameters of the current calibration filter.
Therefore, a target extremum is determined on the amplitude-frequency characteristic curve by setting a difference range between the frequency response curve and the standard frequency response curve, and the calibration filtering parameter of the calibration filter is calculated according to the coordinate information of the target extremum, so that theoretical correction of the frequency response curve by using the calibration filtering parameter is realized.
Further, a fourth embodiment of the speaker calibration method of the headphones according to the present invention is proposed based on the first and/or second and/or third embodiments of the speaker calibration method of the headphones according to the present invention described above.
In this embodiment, after the step S30, the method for calibrating a speaker of the earphone of the present invention further includes:
step C10, calculating a third frequency response curve based on the recorded filtered sound signals played by the earphone to be tested;
based on the filtered sound signal (hereinafter referred to as a filtered sound signal for distinguishing) played by the earphone to be tested recorded by the standard microphone, a frequency response curve (hereinafter referred to as a third frequency response curve for distinguishing) corresponding to the filtered sound signal is calculated.
In a possible implementation manner, after calibrating the earphone to be tested based on the calibration filtering parameter of the earphone to be tested, a sinusoidal sweep frequency signal is sent again through the Bluetooth adapter, the sinusoidal sweep frequency signal is played through a loudspeaker of the earphone to be tested, then a filtered sound signal sent by the earphone to be tested is recorded through a standard, the recorded filtered sound signal is sent to a test amplifier, the filtered sound signal is converted into a corresponding digital signal through the test amplifier, the digital signal is sent to a sound card of an industrial personal computer, and then fourier transformation is carried out on the new digital signal through the industrial personal computer to obtain a third frequency response curve.
Step C20, determining a second amplitude-frequency characteristic curve based on the difference value between the third frequency response curve and the standard frequency response curve;
a new amplitude-frequency characteristic (hereinafter referred to as a second amplitude-frequency characteristic to show the distinction) is determined based on the difference between the third frequency response and the standard frequency response.
And C30, determining that the calibration result is successful when each extreme value of the second amplitude-frequency characteristic curve is within the preset extreme value range.
And when each extreme value of the third amplitude-frequency characteristic curve is in the preset extreme value range, determining that the SPK calibration result of the earphone to be tested is successful.
In a possible implementation manner, each extremum of the third amplitude-frequency characteristic curve is calculated by the industrial personal computer, and if all extremums are within a preset extremum range, it is determined that the to-be-measured earphone SPK is calibrated, and the calibration result is that the calibration is successful.
In a possible implementation manner, as shown in fig. 6, the SPK calibration process of the earphone to be tested is that bluetooth connection is firstly established with a product to be tested through a bluetooth adapter, then a sinusoidal sweep frequency signal is played through the bluetooth adapter, the earphone to be tested plays a test signal according to the sinusoidal sweep frequency signal, a test signal is collected by a human ear (a standard microphone), then a frequency response analysis is performed on the test signal through a main control machine to obtain a frequency response Curve fr_Curve1, a frequency response Curve Golden is determined according to the frequency response Curve and a target Curve Golden, an extremum of the frequency response Curve golden_fr is calculated, a filter parameter is calculated according to the extremum, then the parameter is written into a product register to calibrate the SPK of the earphone to be tested, a secondary test is performed on the earphone to be tested, a calibration result is determined through a result of the secondary test, and the calibration result is displayed and stored.
In this embodiment, the speaker calibration method of the earphone according to the present invention calculates a third frequency response curve corresponding to a filtered sound signal based on the filtered sound signal played by the earphone to be measured and recorded by the standard microphone; determining a new second amplitude-frequency characteristic curve based on the difference between the third frequency response curve and the standard frequency response curve; and when each extreme value of the third amplitude-frequency characteristic curve is in the preset extreme value range, determining that the SPK calibration result of the earphone to be tested is successful.
Therefore, the accuracy of the calibration result of the earphone to be measured is guaranteed by carrying out secondary test on the earphone to be measured after calibration, and the SPK of the earphone to be measured can be calibrated again when the earphone to be measured is not calibrated successfully.
In addition, the embodiment of the invention also provides a loudspeaker calibration device of the earphone.
Referring to fig. 7, fig. 7 is a functional block diagram of an embodiment of a speaker calibration device of an earphone according to the present invention, and as shown in fig. 7, the speaker calibration device of an earphone according to the present invention includes:
the first frequency response curve module 10 is configured to calculate a first frequency response curve based on the recorded sound signal played by the speaker of the earphone to be tested;
a first calibration filtering parameter module 20, configured to calculate a first calibration filtering parameter based on a difference between the first frequency response curve and a standard frequency response curve;
The calibration module 30 is configured to write the calculated first calibration filtering parameter into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the speaker based on the first calibration filtering parameter.
Further, the speaker calibration device of the earphone of the present invention further comprises:
the theoretical correction module is used for taking the first frequency response curve as a target frequency response curve, taking the first calibration filter parameter as a target calibration filter parameter, and correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
the judging module is used for judging whether a preset filtering cycle ending condition is reached;
the ending circulation module is used for ending the filtering circulation if yes;
the filtering circulation module is used for calculating a second calibration filtering parameter based on the difference value between the corrected frequency response curve and the standard frequency response curve if not, taking the corrected frequency response curve as the target frequency response curve, taking the second calibration filtering parameter as the target calibration filtering parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filtering parameter to obtain a corrected frequency response curve;
And the parameter writing module is used for writing the second calibration filtering parameters calculated in each round of filtering cycle into the earphone to be tested so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the second calibration filtering parameters.
Further, the first calibration filter parameter module 20 includes:
the first amplitude-frequency characteristic curve unit is used for determining a first amplitude-frequency characteristic curve based on the difference value of the first frequency response curve and the standard frequency response curve;
and the first calibration filtering parameter unit is used for calculating a first calibration filtering parameter based on the first amplitude-frequency characteristic curve.
Further, the first calibration filtering parameter unit is further configured to determine, based on a preset extremum range, an absolute value of each extremum that is not in the preset extremum range on the first amplitude-frequency characteristic curve; and determining an extremum corresponding to the largest absolute value in the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the target extremum.
Further, the first calibration filtering parameter unit is further configured to use a frequency point where the target extremum is located as a filter center frequency; taking the amplitude of the target extremum as a filter amplitude; multiplying the maximum absolute value by a preset duty ratio to obtain a target value, and taking a frequency point corresponding to an absolute value with the smallest difference from the target value in the absolute values as a filter bandwidth; calculating a filter quality factor based on the filter center frequency and the filter bandwidth; the filter center frequency, the filter magnitude and the filter quality factor are taken as first calibration filtering parameters.
Further, the speaker calibration device of the earphone of the present invention further comprises:
the third frequency response curve module is used for calculating a third frequency response curve based on the recorded filtered sound signals played by the earphone to be tested;
the second amplitude-frequency characteristic curve module is used for determining a second amplitude-frequency characteristic curve based on the difference value of the third frequency response curve and the standard frequency response curve;
and the calibration success module is used for determining that the calibration result is successful when each extreme value of the second amplitude-frequency characteristic curve is within the preset extreme value range.
Further, the first frequency response curve module 10 is further configured to convert the recorded sound signal played by the earphone speaker to be tested into a digital signal, and perform fourier transform on the digital signal to obtain a first frequency response curve.
The present invention also provides a computer storage medium, on which a speaker calibration program of an earphone is stored, where the speaker calibration program of the earphone, when executed by a processor, implements the steps of the speaker calibration program method of an earphone according to any one of the above embodiments.
The specific embodiments of the computer storage medium of the present invention are substantially the same as the embodiments of the method for calibrating a speaker of the earphone of the present invention, and are not described herein.
The present invention also provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the method for calibrating a loudspeaker of an earphone according to any of the embodiments described above, which is not described in detail herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a TWS headset or the like) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A method for calibrating a speaker of an earphone, the method comprising the steps of:
calculating a first frequency response curve based on the recorded sound signals played by the earphone speaker to be tested;
calculating a first calibration filter parameter based on the difference between the first frequency response curve and the standard frequency response curve;
writing the calculated first calibration filtering parameters into the earphone to be tested, so that the earphone to be tested filters the sound signal to be played by the loudspeaker based on the first calibration filtering parameters.
2. The method for calibrating a speaker of an earphone according to claim 1, wherein after the step of calculating a first calibration filter parameter based on a difference between the first frequency response curve and a standard frequency response curve, the method further comprises:
taking the first frequency response curve as a target frequency response curve, taking the first calibration filter parameter as a target calibration filter parameter, and correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
Judging whether a preset filtering cycle ending condition is reached;
if yes, ending the filtering cycle;
if not, calculating a second calibration filter parameter based on the difference value between the corrected frequency response curve and the standard frequency response curve, taking the corrected frequency response curve as the target frequency response curve, taking the second calibration filter parameter as the target calibration filter parameter, and returning to execute the step of correcting the target frequency response curve based on the target calibration filter parameter to obtain a corrected frequency response curve;
writing the second calibration filtering parameters calculated in each round of filtering cycle into the earphone to be tested, so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the second calibration filtering parameters.
3. The method of calibrating a speaker of a headset according to claim 1, wherein the step of calculating a first calibration filter parameter based on a difference between the first frequency response curve and a standard frequency response curve comprises:
determining a first amplitude-frequency characteristic curve based on the difference between the first frequency response curve and the standard frequency response curve;
and calculating a first calibration filter parameter based on the first amplitude-frequency characteristic curve.
4. A method of calibrating a loudspeaker of an earphone according to claim 3, wherein the step of calculating a first calibration filter parameter based on the first amplitude-frequency characteristic comprises:
determining absolute values of all extreme values which are not in the preset extreme value range on the first amplitude-frequency characteristic curve based on the preset extreme value range;
and determining an extremum corresponding to the largest absolute value in the absolute values as a target extremum, and calculating a first calibration filtering parameter based on the target extremum.
5. The method of speaker calibration for a headset of claim 4, wherein the step of calculating a first calibration filter parameter based on the target extremum comprises:
taking the frequency point where the target extremum is located as the center frequency of the filter;
taking the amplitude of the target extremum as a filter amplitude;
multiplying the maximum absolute value by a preset duty ratio to obtain a target value, and taking a frequency point corresponding to an absolute value with the smallest difference from the target value in the absolute values as a filter bandwidth;
calculating a filter quality factor based on the filter center frequency and the filter bandwidth;
the filter center frequency, the filter magnitude and the filter quality factor are taken as first calibration filtering parameters.
6. The method for calibrating a speaker of an earphone according to any one of claims 1 to 5, wherein after the step of filtering the sound signal to be played by the speaker by the earphone to be tested based on the first calibration filtering parameter, the method further comprises:
calculating a third frequency response curve based on the recorded filtered sound signals played by the earphone to be tested;
determining a second amplitude-frequency characteristic curve based on the difference between the third frequency response curve and the standard frequency response curve;
and when each extreme value of the second amplitude-frequency characteristic curve is in the preset extreme value range, determining that the calibration result is successful.
7. The method for calibrating a speaker of an earphone according to any of claims 1 to 5, wherein the step of calculating a first frequency response curve based on the recorded sound signal played by the speaker of the earphone to be measured comprises:
and converting the recorded sound signal played by the earphone speaker to be tested into a digital signal, and carrying out Fourier transform on the digital signal to obtain a first frequency response curve.
8. A speaker calibration device for an earphone, the speaker calibration device comprising:
The first frequency response curve module is used for calculating a first frequency response curve based on the recorded sound signals played by the earphone speaker to be tested;
the first calibration filtering parameter module is used for calculating a first calibration filtering parameter based on the difference value between the first frequency response curve and the standard frequency response curve;
and the calibration module is used for writing the calculated first calibration filtering parameters into the earphone to be tested so that the earphone to be tested filters the sound signals to be played by the loudspeaker based on the first calibration filtering parameters.
9. A terminal device, characterized in that the terminal device comprises: memory, a processor and a speaker calibration program of a headset stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the speaker calibration method of a headset according to any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a speaker calibration program of a headset, which when executed by a processor, implements the steps of the speaker calibration method of a headset according to any of claims 1 to 7.
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