WO2020238000A1 - 一种音频处理方法、装置、终端及计算机可读存储介质 - Google Patents

一种音频处理方法、装置、终端及计算机可读存储介质 Download PDF

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Publication number
WO2020238000A1
WO2020238000A1 PCT/CN2019/113685 CN2019113685W WO2020238000A1 WO 2020238000 A1 WO2020238000 A1 WO 2020238000A1 CN 2019113685 W CN2019113685 W CN 2019113685W WO 2020238000 A1 WO2020238000 A1 WO 2020238000A1
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Prior art keywords
audio
matched
frequency
response curve
frequency response
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PCT/CN2019/113685
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English (en)
French (fr)
Inventor
杜承才
闫震海
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腾讯音乐娱乐科技（深圳）有限公司
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Priority to US17/629,357 priority Critical patent/US12058499B2/en
Publication of WO2020238000A1 publication Critical patent/WO2020238000A1/zh

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/26—Pre-filtering or post-filtering
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/165—Equalizers; Volume or gain control in limited frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups

Definitions

  • the present invention relates to the field of audio processing technology, and in particular to an audio processing method, device, terminal and computer readable storage medium.
  • the audio playback effect of the audio playback device can be adjusted by adjusting the equalizer. Specifically, in response to the user's adjustment operation on the equalizer, the corresponding parameters of the equalizer can be adjusted to adjust the audio playback effect of the audio playback device.
  • the above adjustment method needs to listen to the audio playback effect of the audio playback device every time the equalizer is adjusted. If you are not satisfied with the audio playback effect, you need to adjust the equalizer again. It can be seen that the existing method of adjusting the audio playback effect takes time Longer and less efficient.
  • the audio processing method, device, terminal, and computer-readable storage medium provided by the embodiments of the present invention can adopt matching rules from the audio to be matched to the reference audio to adaptively adjust the audio playback effect of the audio playback device, thereby improving audio playback The adjustment efficiency of the effect.
  • an audio processing method including:
  • target filter set as a matching rule from the audio to be matched to the reference audio
  • an audio processing device including:
  • An obtaining unit configured to obtain the audio to be matched and the reference audio, and obtain the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio;
  • the determining unit is configured to determine the spectral difference between the to-be-matched audio and the reference audio according to the spectral distribution of the to-be-matched audio and the spectral distribution of the reference audio, and use the spectral difference to determine
  • the target filter set of the audio to be matched matched to the reference audio, and the target filter set is used as a matching rule from the audio to be matched to the reference audio;
  • a processing unit configured to compensate the audio playback device by using the matching rule to adjust the audio playback effect of the audio playback device
  • the playback unit is used to play audio through the compensated audio playback device.
  • an embodiment of the present invention provides a terminal including a processor and a memory, the processor and the memory are connected to each other, wherein the memory is used to store a computer program, and the computer program includes program instructions.
  • the processor is configured to call the program instructions to execute the audio processing method as described in the first aspect.
  • an embodiment of the present invention provides a computer-readable storage medium that stores a computer program, and the computer program includes program instructions that, when executed by a processor, cause all The processor executes the audio processing method as described in the first aspect.
  • the terminal can determine the matching rule of the audio to be matched to the reference audio according to the spectral difference between the audio to be matched and the reference audio (that is, to match the audio to be matched to the target filter of the reference audio)
  • the matching rule can be used to compensate the audio playback device to adjust the audio playback effect of the audio playback device, and play audio through the compensated audio playback device; this method realizes the audio playback effect of the audio playback device
  • the adaptive adjustment process effectively improves the adjustment efficiency of the audio playback effect, so that the audio playback device can present a better audio playback effect.
  • Figure 1 is a schematic diagram of an audio processing scenario provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an audio processing interface provided by an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of an audio processing method provided by an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an absolute error frequency response curve provided by an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of another absolute error frequency response curve provided by an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an audio processing device provided by an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a terminal provided by an embodiment of the present invention.
  • an audio processing method can obtain a matching rule between the audio to be matched and the reference audio, and use the matching rule to compensate the audio playback device to adjust the audio.
  • the audio playback effect of the playback device so as to play audio through the compensated audio playback device.
  • the audio to be matched refers to the recorded audio played by the first audio playback device, and the audio playback effect of the first audio device is poor or non-standard.
  • the reference audio refers to the recorded audio played by the second audio playback device, and the audio playback effect of the second audio playback device is better or more standard.
  • the first audio playback device and the second audio playback device are audio playback devices of the same type.
  • the audio played by the first audio playback device and the audio played by the second audio playback device correspond to the same sound source, for example, correspond to the same segment of the same song.
  • the aforementioned compensated audio playback device and the first audio playback device may be the same audio playback device or not, and the audio playback effect of the audio playback device is poor or non-standard.
  • the audio processing method may be applied to the terminal to adjust the audio playback effect of the connected audio playback device.
  • the connection can be wired or wireless.
  • FIG. 1 shows a smart phone 10 connected to a pair of earphones 20.
  • the smart phone can use the matching rule to compensate the earphone 20, so that the earphone 20 can present a better audio playback effect.
  • the audio processing method can also be applied to the adjustment of the audio playback effect of the audio playback device.
  • the earphone 20 can use the matching rule to compensate itself, so as to present a better audio playback effect.
  • the terminal may obtain the matching rule from the audio to be matched to the reference audio in any of the following ways.
  • the terminal can calculate the matching rule in real time.
  • the terminal obtaining the matching rule between the audio to be matched and the reference audio may include: the terminal obtains the audio to be matched and the reference audio; the terminal determines that the audio to be matched is to be matched according to the spectral difference between the audio to be matched and the reference audio The matching rule of the reference audio.
  • the terminal may obtain the matching rule from the server.
  • obtaining the matching rule from the audio to be matched to the reference audio by the terminal may include: the terminal sends a matching rule obtaining request to the server, and receiving the matching rule from the audio to be matched to the reference audio returned by the server according to the matching rule obtaining request.
  • the server can also calculate the matching rule in the above-mentioned manner.
  • the matching rule acquisition request may carry the to-be-matched audio and the reference audio, so that the server can calculate the matching rule from the to-be-matched audio to the reference audio according to the to-be-matched audio and the reference audio.
  • the matching rule obtaining request is used to trigger the server to obtain the matching rule from the audio to be matched to the reference audio.
  • the matching rule acquisition request may also carry the identifier of the audio playback device, so that the server can query the matching rule from the audio to be matched corresponding to the audio playback device to the reference audio according to the identifier of the audio playback device.
  • the identification is the name and/or model.
  • the terminal may calculate the matching rule in advance before acquiring the audio to be matched to the reference audio. Specifically, the terminal can obtain the audio to be matched and the reference audio before obtaining the audio to be matched to the reference audio, and determine the difference between the audio to be matched and the reference audio according to the spectral difference between the audio to be matched and the reference audio. Matching rules.
  • the terminal can respond to the user's adjustment operation on the audio playback effect of the audio playback device, and obtain a matching rule from the audio to be matched to the reference audio.
  • the adjustment operation of the audio playback effect may include a touch operation of an audio playback effect adjustment button or an audio playback device adaptation button, such as a click operation.
  • Fig. 2 shows an audio processing interface 30, which includes an audio playback effect adjustment button 01.
  • the terminal can respond to the user's click operation on the audio playback effect adjustment button 01 to execute the audio described in the embodiment of the present invention. Approach.
  • the terminal can obtain the matching rule from the audio to be matched to the reference audio when detecting that the audio playing device is in the audio playing state. Or, when detecting that the audio playback device is in the audio playback state, the terminal can respond to the user's adjustment operation on the audio playback effect of the audio playback device, and obtain a matching rule from the audio to be matched to the reference audio.
  • the terminal may also obtain the matching rule from the audio to be matched to the reference audio when other preset conditions are met, which are not listed here in this embodiment of the present invention.
  • the embodiment of the present invention provides a schematic flowchart of an audio processing method in FIG. 3.
  • the method described in the embodiment of the present invention may be implemented by a terminal, and the terminal may be a smart terminal or an audio playback device.
  • the terminal includes, but is not limited to, smart phones, tablet computers, notebook computers, desktop computers, MP3, MP4 and other smart terminals.
  • the audio playback device includes, but is not limited to, earphones, such as wired earphones, wireless earphones, such as Bluetooth/Wireless Fidelity (WIFI) earphones, wireless speakers, such as Bluetooth/WIFI speakers, and other devices that can be used for audio playback.
  • WIFI Bluetooth/Wireless Fidelity
  • earphones can also be divided into ordinary earphones and high-fidelity (High Fidelity, HIFI) earphones, which are not limited in the embodiment of the present invention.
  • the method includes steps S301-S303:
  • the terminal can obtain the matching rule from the audio to be matched to the reference audio.
  • the terminal can obtain the audio to be matched and the reference audio, and determine the matching rule from the audio to be matched to the reference audio according to the spectrum difference between the audio to be matched and the reference audio.
  • the terminal determines the matching rule from the to-be-matched audio to the reference audio according to the frequency spectrum difference between the to-be-matched audio and the reference audio, refer to steps S302-S305.
  • the terminal in order to determine the matching rule from the audio to be matched to the reference audio, the terminal may obtain the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio.
  • the terminal can perform spectrum analysis on the audio to be matched to obtain the spectrum distribution of the audio to be matched, and perform spectrum analysis on the reference audio to obtain the spectrum distribution of the reference audio.
  • the methods used for spectrum analysis include but are not limited to any one of the following: periodogram method, autocorrelation method, Bartlett method, and Welch method.
  • Spectrum distribution refers to the frequency distribution curve, such as frequency response curve, hereinafter referred to as frequency response curve.
  • the frequency response curve may be an amplitude-frequency response curve.
  • the abscissa of the frequency response curve represents the frequency point, hereinafter referred to as the frequency point
  • the ordinate represents the amplitude value at the corresponding frequency point.
  • the amplitude value in the embodiment of the present invention may also be referred to as an amplitude-frequency response value.
  • the terminal can also perform spectrum analysis on the audio to be matched to obtain the frequency spectrum distribution of the audio to be matched, and download the frequency spectrum distribution of the reference audio from the server.
  • the server stores the frequency spectrum distribution of the reference audio, which effectively saves the storage space of the terminal.
  • the terminal can also download the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio from the server.
  • the server stores the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio, which effectively saves the storage space of the terminal.
  • S303 Determine a frequency spectrum difference between the audio to be matched and the reference audio according to the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio.
  • the frequency spectrum difference refers to the difference between the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio.
  • the spectral difference refers to an error frequency response curve between the audio to be matched and the reference audio, and the error frequency response curve is to measure the spectral distribution of the audio to be matched and the reference audio. Obtained after the difference operation.
  • the error frequency response curve between the audio to be matched and the reference audio is Calculated by the following formula:
  • S304 Determine a target filter set for matching the audio to be matched to the reference audio by using the frequency spectrum difference
  • the target filter set may include one or more filters.
  • the determining the target filter set for matching the audio to be matched to the reference audio by using the spectral difference may include: determining filter parameters according to the error frequency response curve;
  • the filter parameter determines a target filter set for matching the audio to be matched to the reference audio from the filter set to be selected, the set of to be selected filters includes M filters, where M is A positive integer greater than or equal to 1.
  • the filter parameters include cut-off frequency, gain value and quality factor.
  • the candidate filter set includes any one or more of the following types of filters: a low-pass filter, a first-type band-pass filter, a second-type band-pass filter, and a high-pass filter.
  • Each type of filter includes any one or more of the following orders: 1st order filter, 2nd order filter, 3rd order filter, 4th order filter.
  • the low-pass filter includes a first-order low-pass filter, a second-order low-pass filter, a third-order low-pass filter, and a fourth-order low-pass filter.
  • the determining the filter parameters according to the error frequency response curve may include: obtaining the maximum amplitude value and the target frequency point on the error frequency response curve, and the amplitude value corresponding to the target frequency point is One half of the maximum amplitude value, or the target frequency point is a preset frequency point; the maximum amplitude value and the target frequency point are used to determine filter parameters, and the filter parameters include cutoff frequency, Gain value and quality factor.
  • the target frequency point may include a low-side frequency and a high-side frequency.
  • the low-side frequency described in the embodiment of the present invention may be referred to as the low-side cut-off frequency
  • the high-side frequency may be referred to as the high-side cut-off frequency.
  • the maximum amplitude value on the error frequency response curve refers to the maximum amplitude value of the absolute error frequency response curve.
  • the absolute error frequency response curve is obtained after taking the absolute value of the amplitude value of the error frequency response curve.
  • the error frequency response curve is The absolute error frequency response curve is Calculated by the following formula:
  • the target frequency can be found directly on the absolute error frequency response curve. Specifically, find the absolute error frequency response curve The frequency point corresponding to the maximum amplitude value of, and set the index number of the frequency point as m, and the absolute error frequency response curve The maximum amplitude value of is expressed as Frequency response curve from absolute error , Find the absolute error frequency response curve The maximum amplitude value point to the left of the amplitude value is The frequency point and the amplitude on the right are Frequency point and set the amplitude value The frequency point of is determined as the target frequency point.
  • the low-side frequency is the maximum amplitude value and the left side amplitude value is Frequency point
  • the high-side frequency is the maximum amplitude value and the right-side amplitude value is Frequency point. among them, It is one-half of the maximum amplitude value.
  • the target frequency can be found indirectly through the absolute error frequency response curve.
  • Frequency response curve due to absolute error Is composed of some discrete values, so there may be no way to determine the absolute error frequency response curve Directly find the target frequency point in, then use formula 1.3 to calculate the target frequency point.
  • the absolute error frequency response curve To the left of the maximum amplitude point the amplitude frequency point FG k-1 corresponds to less than The amplitude frequency point FG k corresponding to the amplitude value is greater than The amplitude value on the left side of the maximum amplitude value point is calculated from these two amplitude frequency points Calculate the low-side frequency f l .
  • f l is calculated by the following formula:
  • f k represents the k-th frequency point, and f k is the frequency point corresponding to FG k , Is the amplitude value corresponding to FG k ;
  • f k-1 represents the k-1 frequency point, f k-1 is the frequency point corresponding to FG k-1 , Is the amplitude value corresponding to FG k-1 .
  • the absolute error frequency response curve The amplitude value on the right side of the maximum amplitude point is The frequency point of, that is, the high-side frequency f h , can also be obtained by calculation in a similar manner, which is not described in detail in the embodiment of the present invention.
  • the preset frequency can be set as the target frequency.
  • the preset frequency point may specifically include a low frequency threshold (denoted as f l_thr ) and a high frequency threshold (denoted as f h_thr ).
  • f l_thr a low frequency threshold
  • f h_thr a high frequency threshold
  • the target frequency can be found directly or indirectly as shown in the upper left corner of the picture in Figure 5; or, it may also appear that the maximum value cannot be found on the left as shown in the upper right corner of the picture in Figure 5.
  • the frequency point corresponding to one-half of the amplitude value; or, the frequency point corresponding to one-half of the maximum amplitude value may not be found on the right side of the picture shown in the lower left corner of Figure 5; or, also It may appear that the frequency point corresponding to one-half of the maximum amplitude value cannot be found on the left and right sides of the picture in the lower right corner of Figure 5.
  • the low-side frequency can be set as the low-frequency threshold in the preset frequency point. As the set f l f l_thr.
  • the high-side frequency can be set as the high-frequency threshold in the preset frequency point. For example, set f h to f h_thr .
  • the low frequency threshold and the high frequency threshold are set according to empirical values.
  • the maximum amplitude value and the target frequency point can be used to determine the filter parameters.
  • the cutoff frequency can be calculated from the target frequency. Specifically, the product of the low-side frequency and the high-side frequency can be square rooted to obtain the cutoff frequency.
  • the filter parameters can be used to determine a target filter set for matching the audio to be matched to the reference audio from the set of filters to be selected.
  • using the filter parameters to determine a target filter set for matching the audio to be matched to the reference audio from the filter set to be selected may include: using the filter parameters to obtain N filters are determined from the M filters included in the filter set to be selected, where N is a positive integer less than or equal to the M; the frequency response curve of each filter in the N filters is obtained The average absolute error value between the error frequency response curves; the first filter corresponding to the smallest average absolute error value among the N filters is added to match the audio to be matched to the reference Audio target filter set.
  • the determining N filters from the M filters included in the filter set to be selected by using the filter parameters may include: combining the cutoff frequency in the filter parameters with The preset frequency points are compared to obtain a comparison result, and N filters are determined from the M filters included in the filter set to be selected according to the comparison result.
  • N filters including low-pass filters are determined from the M filters included in the filter set to be selected; when f c If f h_thr is greater than or equal to f h_thr , N filters including a high-pass filter are determined from M filters included in the filter set to be selected.
  • the error frequency response curve may be updated for error judgment.
  • the frequency response curve of the first filter can be used to update the error frequency response curve to obtain the updated error frequency response curve; if the updated error frequency response curve corresponds to the average absolute error value and the maximum If the absolute error value does not meet the preset conditions, the filter parameters are re-determined according to the updated error frequency response curve; the re-determined filter parameters are used to add filters to the target filter set until the updated error frequency response
  • the average absolute error value and the maximum absolute error value corresponding to the curve satisfy the preset condition, and the preset condition includes that the average absolute error value is less than or equal to the first preset threshold, and the maximum absolute error value is less than or equal to the second preset Threshold, after meeting the preset condition, it means that the matching error of the audio to be matched to the reference audio has tended to converge stably, and the target filter set at this time can be used as the matching rule of the
  • aver_value is the average absolute error value corresponding to the updated error frequency response curve
  • aver_value_thr is the first preset threshold
  • max_value is the maximum average absolute error value corresponding to the updated error frequency response curve
  • max_value_thr is the second preset threshold .
  • using the frequency response curve of the first filter to update the error frequency response curve to obtain the updated error frequency response curve may include: using the error frequency response curve and the first filter The frequency response curve performs difference calculation to obtain the updated error frequency response curve. For example, if the frequency response curve of the first filter is g ji , the updated error frequency response curve When the updated error frequency response curve When the corresponding aver_value and max_value do not meet the preset conditions, it needs to be based on the updated error frequency response curve Re-determine the filter parameters; use the re-determined filter parameters to add filters to the target filter set until the updated error frequency response curve The corresponding aver_value and max_value satisfy Equation 1.5.
  • S306 Use the matching rule to compensate the audio playback device to adjust the audio playback effect of the audio playback device.
  • the process of using the matching rule to compensate the audio playback device can be understood as the process of using the matching rule to equalize the audio played by the audio playback device.
  • the embodiment of the present invention can obtain a target filter set that simulates the equalization process of the audio to be matched to the reference audio through an equalization matching algorithm, and then use the target filter set to compensate the audio playback device.
  • the equalization matching algorithm can simulate the original equalization process through existing filters.
  • the terminal may obtain the matching rule from the audio to be matched to the reference audio, and the matching rule is obtained according to the spectral difference between the audio to be matched and the reference audio;
  • the playback device compensates to adjust the audio playback effect of the audio playback device; the compensated audio playback device plays the audio, thereby effectively improving the adjustment efficiency of the audio playback effect, so that the audio playback device can present better audio playback effect.
  • FIG. 6 is a schematic structural diagram of an audio processing device according to an embodiment of the present invention.
  • the device can be applied to terminals. Specifically, the device can run the following units:
  • the obtaining unit 601 is configured to obtain the audio to be matched and the reference audio, and obtain the frequency spectrum distribution of the audio to be matched and the frequency spectrum distribution of the reference audio;
  • the determining unit 602 is configured to determine the spectral difference between the to-be-matched audio and the reference audio according to the spectral distribution of the to-be-matched audio and the spectral distribution of the reference audio, and use the spectral difference to determine Matching the audio to be matched to a target filter set of the reference audio, and using the target filter set as a matching rule from the audio to be matched to the reference audio;
  • the processing unit 603 is configured to compensate the audio playback device by using the matching rule to adjust the audio playback effect of the audio playback device;
  • the playing unit 604 is used for playing audio through the compensated audio playing device.
  • the frequency spectrum difference is an error frequency response curve between the audio to be matched and the reference audio
  • the determining unit 602 uses the frequency spectrum difference to determine a method for matching the audio to be matched to the
  • the target filter set of the reference audio is specifically determining filter parameters according to the error frequency response curve; using the filter parameters to determine from the set of filters to be selected for matching the audio to be matched to the reference
  • An audio target filter set, the candidate filter set includes M filters, and the M is a positive integer greater than or equal to 1.
  • the determining unit 602 determines the filter parameters according to the error frequency response curve, specifically obtaining the maximum amplitude value and the target frequency point on the error frequency response curve, and the amplitude value corresponding to the target frequency point Is one half of the maximum amplitude value, or the target frequency point is a preset frequency point; the maximum amplitude value and the target frequency point are used to determine filter parameters, and the filter parameters include a cutoff frequency , Gain value and quality factor.
  • the determining unit 602 uses the filter parameters to determine a target filter set for matching the audio to be matched to the reference audio from the filter set to be selected, specifically using the The filter parameters determine N filters from the M filters included in the set of filters to be selected, where N is a positive integer less than or equal to the M; and obtain the value of each of the N filters The average absolute error value between the frequency response curve and the error frequency response curve; adding the first filter corresponding to the smallest average absolute error value among the N filters to be used for matching the audio to be matched Into the target filter set of the reference audio.
  • the determining unit 602 is further configured to use the frequency response curve of the first filter to update the error frequency response curve to obtain the updated error frequency response curve; if the updated error frequency response curve is The average absolute error value and the maximum absolute error value corresponding to the response curve do not meet the preset conditions, the filter parameters are re-determined according to the updated error frequency response curve; the re-determined filter parameters are used to add to the target filter set Filter until the average absolute error value and the maximum absolute error value corresponding to the updated error frequency response curve meet the preset condition, and the preset condition includes that the average absolute error value is less than or equal to the first preset threshold, and the maximum The absolute error value is less than or equal to the second preset threshold.
  • steps S301-S307 involved in the audio processing method shown in FIG. 3 may be executed by the units in the embodiment in FIG. 6.
  • step S301 and step S302 shown in FIG. 3 can be executed by the acquiring unit 601 shown in FIG. 6
  • steps S303-S305 can be executed by the determining unit 602 shown in FIG. 6
  • step S306 and step S307 can be respectively processed by Unit 603 and playing unit 604.
  • the units in the audio processing device shown in FIG. 6 can be separately or completely combined into one or several additional units to form, or some of the units can be disassembled. It is divided into multiple functionally smaller units to form, which can realize the same operation without affecting the realization of the technical effect of the embodiment of the present invention.
  • the above-mentioned units are divided based on logical functions. In practical applications, the function of one unit may also be realized by multiple units, or the functions of multiple units may be realized by one unit. In other embodiments of the present invention, the image processing apparatus may also include other units. In practical applications, these functions may also be implemented with the assistance of other units, and may be implemented by multiple units in cooperation.
  • a general-purpose computing device such as a computer including a central processing unit (CPU), a random access storage medium (RAM), a read-only storage medium (ROM) and other processing elements and storage elements
  • CPU central processing unit
  • RAM random access storage medium
  • ROM read-only storage medium
  • Run a computer program capable of executing the steps involved in the audio processing method as shown in FIG. 3 to construct the audio processing device as shown in FIG. 6 and to implement the audio processing method of the embodiment of the present invention .
  • the computer program can be recorded on, for example, a computer-readable recording medium, and loaded into the aforementioned computing device via the computer-readable recording medium, and run in it.
  • the audio processing device may obtain the matching rule from the audio to be matched to the reference audio, the matching rule is obtained based on the spectral difference between the audio to be matched and the reference audio; the matching rule is used Compensate the audio playback device to adjust the audio playback effect of the audio playback device; play audio through the compensated audio playback device, thereby effectively improving the adjustment efficiency of the audio playback effect, so that the audio playback device can present better Audio playback effect.
  • an embodiment of the present invention also provides a terminal.
  • the internal structure of the terminal includes at least one or more processors 701 and a memory 702.
  • the processor 701 and the memory 702 in the terminal may be connected through a bus or in other ways.
  • the connection through a bus is taken as an example.
  • the internal structure of the terminal may further include one or more input devices 703 and one or more output devices 704.
  • the processor 701, the storage device 702, the input device 703, and the output device 704 are connected by a bus or other means.
  • the connection by a bus is taken as an example.
  • the memory 702 is configured to store a computer program including program instructions
  • the processor 701 is configured to execute the program instructions stored in the memory 702.
  • the processor 701 loads and executes one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method in the above-mentioned corresponding embodiment; in specific implementation, the computer-readable storage medium At least one instruction in is loaded by the processor 701 and executes the following steps:
  • target filter set as a matching rule from the audio to be matched to the reference audio
  • the frequency spectrum difference is an error frequency response curve between the audio to be matched and the reference audio. Accordingly, the at least one program instruction is loaded by the processor 701 and is also used to execute:
  • the filter parameters are used to determine a target filter set for matching the audio to be matched to the reference audio from a set of to-be-selected filters, the set of to-be-selected filters includes M filters, and M is a positive integer greater than or equal to 1.
  • the at least one program instruction is loaded by the processor 701 and is also used to execute:
  • the amplitude value corresponding to the target frequency point is one-half of the maximum amplitude value, or the target frequency point is a preset frequency point ;
  • the filter parameters are determined by using the maximum amplitude value and the target frequency point, and the filter parameters include a cut-off frequency, a gain value and a quality factor.
  • the at least one program instruction is loaded by the processor 701 and is also used to execute:
  • N filters from M filters included in the filter set to be selected by using the filter parameters, where N is a positive integer less than or equal to the M;
  • the first filter corresponding to the smallest average absolute error value among the N filters is added to the target filter set for matching the audio to be matched to the reference audio.
  • the at least one program instruction is loaded by the processor 701 and is also used to execute:
  • N filters are determined from the M filters included in the filter set to be selected.
  • the at least one program instruction is loaded by the processor 701 and is also used to execute:
  • the filter parameters are re-determined according to the updated error frequency response curve
  • the preset frequency point includes a low frequency threshold and a high frequency threshold.
  • the processor 701 may be a central processing unit (Central Processing Unit, CPU), and the processor may also be another general-purpose processor, that is, a microprocessor or any conventional processor.
  • the memory 702 may include a read-only memory and a random access memory, and provides instructions and data to the processor 701. Therefore, the processor 701 and the memory 702 are not limited here.
  • the input device 703 may include an audio collection device, such as a recorder, or may also include a touch screen.
  • the output device 704 may include an audio playback device, such as a speaker, or may also include a display screen. Among them, the touch screen and the display screen can be integrated into a touch display screen.
  • the input device 703 and the output device 704 may also include standard wired interfaces and/or wireless interfaces.
  • the program can be stored in a computer-readable storage medium. When executed, it may include the processes of the above-mentioned method embodiments.
  • the storage medium may be a magnetic disk, an optical disc, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM), etc.

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Abstract

本发明实施例提供了一种音频处理方法、装置、终端及计算机可读存储介质，其中，该方法可以包括：获取待匹配音频和参考音频；获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合；将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；通过补偿后的音频播放设备播放音频。采用本发明，可以利用匹配规则对音频播放设备的音频播放效果进行自适应的调节，进而提升音频播放效果的调节效率。

Description

一种音频处理方法、装置、终端及计算机可读存储介质 技术领域
本发明涉及音频处理技术领域，尤其涉及一种音频处理方法、装置、终端及计算机可读存储介质。
背景技术
随着科技的发展，诸如耳机类的音频播放设备在人们的日常生活中得到了越来越多的应用。通常来说，可以通过调节均衡器的方式来调节音频播放设备的音频播放效果。具体地，可以响应用户对均衡器的调节操作，调节该均衡器的相应参数以调节音频播放设备的音频播放效果。然而，上述调节方式需要每调节一次均衡器就去听音频播放设备的音频播放效果，如果对音频播放效果不满意，则需要再次调节均衡器，可见，现有的调节音频播放效果的方式耗时较长，效率较低。
发明内容
本发明实施例提供的一种音频处理方法、装置、终端及计算机可读存储介质，可以采用待匹配音频到参考音频的匹配规则，自适应地调节音频播放设备的音频播放效果，进而提升音频播放效果的调节效率。
第一方面，本发明实施例提供了一种音频处理方法，包括：
获取待匹配音频和参考音频；
获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；
根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异；
利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合；
将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；
利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
通过补偿后的音频播放设备播放音频。
第二方面，本发明实施例提供了一种音频处理装置，包括：
获取单元，用于获取待匹配音频和参考音频，并获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；
确定单元，用于根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异，并利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；
处理单元，用于利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
播放单元，用于通过补偿后的音频播放设备播放音频。
第三方面，本发明实施例提供了一种终端，包括处理器和存储器，所述处理器和存储器相互连接，其中，所述存储器用于存储计算机程序，所述计算机程序包括程序指令，所述处理器被配置用于调用所述程序指令，执行如第一方面所述的音频处理方法。
第四方面，本发明实施例提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，所述计算机程序包括程序指令，所述程序指令当被处理器执行时使所述处理器执行如第一方面所述的音频处理方法。
可见，终端可以在获取待匹配音频和参考音频后，根据待匹配音频和参考音频之间的频谱差异，确定待匹配音频到参考音频的匹配规则(即将待匹配音频匹配到参考音频的目标滤波器集合)之后，能够利用该匹配规则对音频播放设备进行补偿，以调节该音频播放设备的音频播放效果，并通过补偿后的音频播放设备播放音频；该方式实现了对音频播放设备的音频播放效果的自适应的调节过程，有效地提升了音频播放效果的调节效率，使得音频播放设备能够呈现较优的音频播放效果。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述 中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的一种音频处理场景的示意图；
图2是本发明实施例提供的一种音频处理界面的示意图；
图3是本发明实施例提供的一种音频处理方法的流程示意图；
图4是本发明实施例提供的一种绝对误差频响曲线的示意图；
图5是本发明实施例提供的另一种绝对误差频响曲线的示意图；
图6是本发明实施例提供的一种音频处理装置的结构示意图；
图7是本发明实施例提供的一种终端的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述。
在本发明实施例中，提供了一种音频处理方法，该音频处理方法可以通过获取待匹配音频到参考音频之间的匹配规则，并利用该匹配规则对音频播放设备进行补偿，以调节该音频播放设备的音频播放效果，从而通过补偿后的音频播放设备播放音频。其中，待匹配音频是指录制的第一音频播放设备播放出来的音频，该第一音频设备的音频播放效果较差或不标准。参考音频是指录制的第二音频播放设备播放出来的音频，该第二音频播放设备的音频播放效果较优或较为标准。
可选地，该第一音频播放设备与该第二音频播放设备为同类型的音频播放设备。该第一音频播放设备播放出来的音频与该第二音频播放设备播放出来的音频对应同一音源，例如，对应同一首歌的同一个片段。
可选地，前述被补偿的音频播放设备与该第一音频播放设备可以为同一音频播放设备，也可以不为同一音频播放设备，该音频播放设备的音频播放效果较差或不标准。
在一个实施例中，该音频处理方法可以应用在终端对连接的音频播放设备的音频播放效果的调节上。该连接可以为有线连接或无线连接。如图1所示，图1展示的是一个智能手机10，该智能手机10连接了一副耳机20。运用本发 明实施例所述的音频处理方法，使得智能手机能够采用匹配规则对耳机20进行补偿，以使得耳机20能够呈现较优的音频播放效果。
可选地，在图1中，该音频处理方法还可以应用在音频播放设备对自身的音频播放效果的调节上。运用本发明实施例所述的音频处理方法，使得耳机20能够采用匹配规则对自身进行补偿，以呈现较优的音频播放效果。
其中，终端可以通过以下几种方式中的任一种方式，获取待匹配音频到参考音频的匹配规则。
在一个实施例中，终端可以实时计算出匹配规则。例如，终端获取待匹配音频到参考音频之间的匹配规则，可以包括：终端获取待匹配音频以及参考音频；终端根据该待匹配音频和待参考音频之间的频谱差异，确定该待匹配音频到该参考音频的匹配规则。
在一个实施例中，终端可以从服务器获取匹配规则。例如，终端获取待匹配音频到参考音频的匹配规则，可以包括：终端发送匹配规则获取请求至服务器，接收服务器根据该匹配规则获取请求返回的该待匹配音频到该参考音频的匹配规则。其中，服务器也可以采用上述方式计算出匹配规则。可选地，该匹配规则获取请求可以携带该待匹配音频和该参考音频，以便服务器根据该待匹配音频以及该参考音频计算出该待匹配音频到该参考音频的匹配规则。可选地，该匹配规则获取请求，用于触发服务器获取该待匹配音频到该参考音频的匹配规则。可选地，该匹配规则获取请求还可以携带音频播放设备的标识，以便服务器根据该音频播放设备的标识查询出该音频播放设备对应的待匹配音频到该参考音频的匹配规则。该标识为名称和/或型号。
在一个实施例中，终端可以在获取待匹配音频到参考音频之前，提前计算出匹配规则。具体地，终端能够在获取待匹配音频到参考音频之前，获取该待匹配音频和参考音频，并根据该待匹配音频和待参考音频之间的频谱差异，确定该待匹配音频到该参考音频的匹配规则。
在一个实施例中，终端能够响应用户对音频播放设备的音频播放效果的调节操作，获取待匹配音频到参考音频的匹配规则。可选地，该音频播放效果的调节操作可以包括对音频播放效果调节按钮或对音频播放设备适配按钮的触控操作，如点击操作。如图2所示，图2展示为音频处理界面30，该音频处 理界面30包括音频播放效果调节按钮01。当用户想要调节音频播放设备的音频播放效果时，可以点击该音频播放效果调节按钮01；终端可以响应该用户对该音频播放效果调节按钮01的点击操作，执行本发明实施例所述的音频处理方法。
在一个实施例，终端能够在检测到音频播放设备处于音频播放状态时，获取待匹配音频到参考音频的匹配规则。或，终端能够在检测到音频播放设备处于音频播放状态时，响应用户对音频播放设备的音频播放效果的调节操作，获取待匹配音频到参考音频的匹配规则。当然，终端还可以在满足其它预设的条件时，获取待匹配音频到参考音频的匹配规则，本发明实施例在此不一一列举。
在一个实施例中，本发明实施例在图3提供了一种音频处理方法的流程示意图。本发明实施例所述的方法可以由一个终端实现，该终端可以为智能终端或音频播放设备。其中，该终端包括但不限于智能手机、平板电脑、笔记本电脑、台式电脑、MP3、MP4等智能终端。该音频播放设备包括但不限于耳机，如有线耳机、无线耳机，如蓝牙/无线保真(Wireless Fidelity，WIFI)耳机、无线音箱，如蓝牙/WIFI音箱等等可以用于音频播放的设备。进一步地，上述耳机还可分为普通耳机和高保真(High Fidelity，HIFI)耳机，本发明实施例对其不做限制。该方法包括步骤S301-S303：
S301、获取待匹配音频和参考音频。
本发明实施例中，终端能够获取待匹配音频到参考音频的匹配规则。
具体地，终端能够获取待匹配音频和参考音频，并根据所述待匹配音频和所述参考音频之间的频谱差异，确定所述待匹配音频到所述参考音频的匹配规则。
其中，终端根据所述待匹配音频和所述参考音频之间的频谱差异，确定所述待匹配音频到所述参考音频的匹配规则，可以参见步骤S302-S305。
S302、获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布。
本发明实施例中，为了确定该待匹配音频到该参考音频的匹配规则，终端可以获取该待匹配音频的频谱分布以及该参考音频的频谱分布。
在一个实施例中，终端能够对该待匹配音频进行频谱分析得到该待匹配音 频的频谱分布，并对该参考音频进行频谱分析得到该参考音频的频谱分布。其中，用于频谱分析的方法包括但不限于以下任意一种：周期图法、自相关法、Bartlett法，Welch法。频谱分布是指频率的分布曲线，如频率响应曲线，以下简称频响曲线。可选地，该频响曲线可以为幅频响应曲线。通常来说，频响曲线的横坐标表示频率点，以下简称频点，纵坐标表示相应频点上的幅度值。在一个实施例中，本发明实施例中的幅度值又可称为幅频响应值。
假设对该待匹配音频进行频谱估计的频点和对该参考音频进行频谱估计的频点均为f i(i＝1,...,n)，n为大于或等于1的整数，则可以将该参考音频和该待匹配音频对应相应频点上的幅度值分别表示为g i和g i'。
在一个实施例中，终端还能对该待匹配音频进行频谱分析得到该待匹配音频的频谱分布，并从服务器下载该参考音频的频谱分布。通过服务器存储参考音频的频谱分布，有效地节约了终端的存储空间。
在一个实施例中，终端还能从服务器下载该待匹配音频的频谱分布和该参考音频的频谱分布。通过服务器存储该待匹配音频的频谱分布和该参考音频的频谱分布，有效地节约了终端的存储空间。
S303、根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异。
其中，频谱差异指该待匹配音频的频谱分布和该参考音频的频谱分布之间的差异。在一个实施例中，该频谱差异指该待匹配音频和该参考音频之间的误差频响曲线，该误差频响曲线是将该待匹配音频的频谱分布与该参考音频之间的频谱分布进行差值运算后得到的。例如，该待匹配音频和该参考音频之间的误差频响曲线为
Figure PCTCN2019113685-appb-000001
通过如下公式计算得到：
Figure PCTCN2019113685-appb-000002
在式1.1中，利用该待匹配音频对应相应频点上的幅度值g i减去参考音频对应相应频点上的幅度值g' i，即可得到误差频响曲线
Figure PCTCN2019113685-appb-000003
S304、利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合；
S305、将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则。
其中，该目标滤波器集合可以包括一个或多个滤波器。
在一个实施例中，所述利用频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，可以包括：根据所述误差频响曲线确定滤波器参数；利用所述滤波器参数从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，所述待选滤波器集合包括M个滤波器，所述M为大于或等于1的正整数。其中，该滤波器参数包括截止频率、增益值和品质因数。该待候选滤波器集合包括以下任一种或多种类型的滤波器：低通滤波器、第一类带通滤波器、第二类带通滤波器、高通滤波器。每种类型的滤波器包括以下任一个或多个阶数的滤波器：1阶滤波器、2阶滤波器、3阶滤波器、4阶滤波器。例如，低通滤波器包括1阶低通滤波器、2阶低通滤波器、3阶低通滤波器、4阶低通滤波器。
在一个实施例中，所述根据所述误差频响曲线确定滤波器参数，可以包括：获取所述误差频响曲线上的最大幅度值和目标频点，所述目标频点对应的幅度值为所述最大幅度值的二分之一，或者，所述目标频点为预设频点；利用所述最大幅度值和所述目标频点确定滤波器参数，所述滤波器参数包括截止频率、增益值和品质因数。其中，该目标频点可以包括低边频率和高边频率。在一个实施例中，本发明实施例所述的低边频率可称为低边截止频率，高边频率可称为高边截止频率。
在一个实施例中，该误差频响曲线上的最大幅度值是指绝对误差频响曲线的最大幅度值。该绝对误差频响曲线是在对该误差频响曲线的幅度值取绝对值后得到的。例如，该误差频响曲线为
Figure PCTCN2019113685-appb-000004
该绝对误差频响曲线为
Figure PCTCN2019113685-appb-000005
通过如下公式计算得到：
Figure PCTCN2019113685-appb-000006
下面将以绝对误差频响曲线为
Figure PCTCN2019113685-appb-000007
为例，简要说明本发明实施例提供的几种确定目标频点的方式。
第一、能够在绝对误差频响曲线上直接找到目标频点。具体地，查找出绝对误差频响曲线
Figure PCTCN2019113685-appb-000008
的最大幅度值对应的频点，并设该频点的索引号为m，将绝对误差频响曲线
Figure PCTCN2019113685-appb-000009
的最大幅度值表示为
Figure PCTCN2019113685-appb-000010
从绝对误差频响曲线
Figure PCTCN2019113685-appb-000011
中，查找出绝对误差频响曲线
Figure PCTCN2019113685-appb-000012
的最大幅度值点左侧幅度值为
Figure PCTCN2019113685-appb-000013
的频点以及右 侧幅度值为
Figure PCTCN2019113685-appb-000014
的频点，并将该幅度值为
Figure PCTCN2019113685-appb-000015
的频点确定为目标频点。此处，低边频率为最大幅度值点左侧幅度值为
Figure PCTCN2019113685-appb-000016
的频点，高边频率为最大幅度值右侧幅度值为
Figure PCTCN2019113685-appb-000017
的频点。其中，
Figure PCTCN2019113685-appb-000018
为最大幅度值的二分之一。
第二、能够通过绝对误差频响曲线间接找到目标频点。由于绝对误差频响曲线
Figure PCTCN2019113685-appb-000019
是由一些离散值构成，因此可能没有办法在绝对误差频响曲线
Figure PCTCN2019113685-appb-000020
中直接找到目标频点，此时可采用式1.3计算出目标频点。如图4所示，在绝对误差频响曲线
Figure PCTCN2019113685-appb-000021
的最大幅度值点的左侧，幅频点FG k-1对应的幅度值小于
Figure PCTCN2019113685-appb-000022
幅频点FG k对应的幅度值大于
Figure PCTCN2019113685-appb-000023
通过这两个幅频点计算出最大幅度值点左侧幅度值为
Figure PCTCN2019113685-appb-000024
的频点，即计算出低边频率f l。具体地，f l通过如下公式计算得到：
Figure PCTCN2019113685-appb-000025
当i＝k时，f k表示第k个频点，f k为FG k对应的频点，
Figure PCTCN2019113685-appb-000026
为FG k对应的幅度值；f k-1表示第k-1个频点，f k-1为FG k-1对应的频点，
Figure PCTCN2019113685-appb-000027
为FG k-1对应的幅度值。相应地，绝对误差频响曲线
Figure PCTCN2019113685-appb-000028
的最大幅度值点右侧幅度值为
Figure PCTCN2019113685-appb-000029
的频点，即高边频率f h，也可以采用类似方式计算得到，本发明实施例在此不做赘述。
在一个实施例中，
Figure PCTCN2019113685-appb-000030
是在位于
Figure PCTCN2019113685-appb-000031
右侧且位于
Figure PCTCN2019113685-appb-000032
左侧的幅度值中，与
Figure PCTCN2019113685-appb-000033
差值绝对值最小的幅度值。
Figure PCTCN2019113685-appb-000034
是在位于
Figure PCTCN2019113685-appb-000035
左侧的幅度值中，与
Figure PCTCN2019113685-appb-000036
差值绝对值最小的幅度值。
Figure PCTCN2019113685-appb-000037
与
Figure PCTCN2019113685-appb-000038
在绝对误差频响曲线
Figure PCTCN2019113685-appb-000039
上为相邻的幅度值。
第三、在采用第一种方式和第二种方式均不能找到目标频点时，可以将预设频点设为目标频点。预设频点具体可包括低频阈值(记为f l_thr)和高频阈值(记为f h_thr)。在实际的音频处理过程中，可能会出现如图5左上角图片展示的能够直接或间接找到目标频点的情况；或，还可能会出现如图5右上角图片展示的左侧找不到最大幅度值的二分之一对应的频点的情况；或，还可能会出现图5左下角图片展示的右侧找不到最大幅度值的二分之一对应的频点的情况；或，还可能会出现图5右下角图片展示的为左右侧均找不到最大幅度值的二分之一对应的频点的情况。对于左侧找不到最大幅度值的二分之一对应的频点的情况，可以将低边频率设置为预设频点中的低频阈值。如，将f l设置为f l_thr。对于右侧查找不到最大幅度值的二分之一对应的频点的情况，可以将高 边频率设置为预设频点中的高频阈值。如，将f h设置为f h_thr。在一个实施例中，该低频阈值和该高频阈值是根据经验值设置的。
在得到目标频点之后，可以利用该最大幅度值和该目标频点确定滤波器参数。例如，通过目标频点计算出截止频率。具体地，可以对低边频率和高边频率的乘积进行开平方处理得到截止频率。例如，截止频率
Figure PCTCN2019113685-appb-000040
还可以通过截止频率、目标频点计算出品质因数Q，并将
Figure PCTCN2019113685-appb-000041
确定为增益值。其中，
Figure PCTCN2019113685-appb-000042
为误差频响曲线
Figure PCTCN2019113685-appb-000043
在i＝m处的幅度值。
在确定滤波器参数后，便可以利用该滤波器参数从待选滤波器集合中确定出用于将该待匹配音频匹配到该参考音频的目标滤波器集合。具体地，所述利用所述滤波器参数从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，可以包括：利用所述滤波器参数从待选滤波器集合包括的M个滤波器中确定出N个滤波器，所述N为小于或等于所述M的正整数；获取所述N个滤波器中每一个滤波器的频响曲线与所述误差频响曲线之间的平均绝对误差值；将所述N个滤波器中对应的平均绝对误差值最小的第一滤波器，添加到用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合中。
为了筛选出合适的滤波器，所述利用所述滤波器参数从待选滤波器集合包括的M个滤波器中确定出N个滤波器，可以包括：将所述滤波器参数中的截止频率和所述预设频点进行比较，得到比较结果，根据所述比较结果从待选滤波器集合包括的M个滤波器中确定出N个滤波器。例如，将f c和f l_thr进行比较，当f c小于或等于f l_thr时，从待选滤波器集合包括的M个滤波器中确定出包括低通滤波器的N个滤波器；当f c大于或等于f h_thr，从待选滤波器集合包括的M个滤波器中确定出包括高通滤波器的N个滤波器。
在一个实施例中，可以根据滤波器参数计算这N个滤波器中每个滤波器在f i下的增益值g ji(j＝1,...,Ni＝1,...,n)，其中，N为滤波器个数，n为频率点的个数。针对已计算出的这N个滤波器的频响曲线g ji(j＝1,...,Ni＝1,...,n)，分别计算每个滤波器的频响曲线与误差频响曲线
Figure PCTCN2019113685-appb-000044
之间的平均绝对误差值。假设第j个滤波器的频响曲线与误差频响曲线
Figure PCTCN2019113685-appb-000045
之间的平均绝对误差值为h j，则h j可以通过如下公式计算得到：
Figure PCTCN2019113685-appb-000046
从得到的N个平均绝对误差值中，确定出最小的平均绝对误差值，设该最小的平均绝对误差值的序号为j min，其中，j min＝arg min(h j)，将该最小的平均绝对误差值所对应的滤波器确定为第一滤波器以添加到目标滤波器集合F中。
在一个实施例中，为了减小从待匹配音频匹配到参考音频的匹配误差，可以对误差频响曲线进行更新以进行误差判断。具体地，可以利用所述第一滤波器的频响曲线对所述误差频响曲线进行更新，得到更新后的误差频响曲线；若更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值不满足预设条件，则根据更新后的误差频响曲线重新确定滤波器参数；利用重新确定的滤波器参数向所述目标滤波器集合中添加滤波器，直到更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值满足所述预设条件，所述预设条件包括平均绝对误差值小于或等于第一预设阈值，且最大绝对误差值小于或等于第二预设阈值，满足所述预设条件后意味着待匹配音频匹配到参考音频的匹配误差已经趋于稳定的收敛，即可将此时的目标滤波器集合作为待匹配音频到参考音频的匹配规则。例如，该预设条件的公式如下：
Figure PCTCN2019113685-appb-000047
其中，aver_value为更新后的误差频响曲线对应的平均绝对误差值，aver_value_thr为第一预设阈值，max_value为更新后的误差频响曲线对应的最大平均绝对误差值，max_value_thr为第二预设阈值。
在一个实施例中，利用所述第一滤波器的频响曲线对所述误差频响曲线进行更新，得到更新后的误差频响曲线，可以包括：利用误差频响曲线和第一滤波器的频响曲线进行差值运算，得到更新后的误差频响曲线。例如，该第一滤波器的频响曲线为g ji，则更新后的误差频响曲线
Figure PCTCN2019113685-appb-000048
当该更新后的误差频响曲线
Figure PCTCN2019113685-appb-000049
对应的aver_value和max_value不满足预设条件时，需根据更新后的误差频响曲线
Figure PCTCN2019113685-appb-000050
重新确定滤波器参数；利用重新确定的滤波器参数向目标滤波器集合中添加滤波器，直到更新后的误差频响曲线
Figure PCTCN2019113685-appb-000051
对应的aver_value和max_value满足式1.5。
S306、利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
S307、通过补偿后的音频播放设备播放音频。
利用匹配规则对音频播放设备进行补偿的过程，可以理解为利用该匹配规则对该音频播放设备所播放出来的音频进行均衡处理的过程。
在一个实施例中，由图3可知，本发明实施例能够通过均衡匹配算法得到模拟待匹配音频到参考音频均衡过程的目标滤波器集合，进而利用该目标滤波器集合对音频播放设备进行补偿。其中，该均衡匹配算法能够通过已有的滤波器去模拟原始均衡的过程。
本发明实施例中，终端可以获取待匹配音频到参考音频的匹配规则，所述匹配规则是根据所述待匹配音频和所述参考音频之间的频谱差异得到的；利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；通过补偿后的音频播放设备播放音频，从而有效地提升了音频播放效果的调节效率，使得音频播放设备能够呈现较优的音频播放效果。
基于上述音频处理方法实施例的描述，本发明实施例还提供了一种音频处理装置。请参阅图6，为本发明实施例提供的一种音频处理装置的结构示意图。该装置可以应用于终端。具体地，该装置可以运行如下单元：
获取单元601，用于获取待匹配音频和参考音频，并获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；
确定单元602，用于根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异，并利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；
处理单元603，用于利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
播放单元604，用于通过补偿后的音频播放设备播放音频。
在一种实施方式中，所述频谱差异为所述待匹配音频和所述参考音频之间的误差频响曲线，确定单元602利用频谱差异确定出用于将所述待匹配音频匹 配到所述参考音频的目标滤波器集合，具体为根据所述误差频响曲线确定滤波器参数；利用所述滤波器参数从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，所述待选滤波器集合包括M个滤波器，所述M为大于或等于1的正整数。
在一种实施方式中，确定单元602根据所述误差频响曲线确定滤波器参数，具体为获取所述误差频响曲线上的最大幅度值和目标频点，所述目标频点对应的幅度值为所述最大幅度值的二分之一，或者，所述目标频点为预设频点；利用所述最大幅度值和所述目标频点确定滤波器参数，所述滤波器参数包括截止频率、增益值和品质因数。
在一种实施方式中，确定单元602利用所述滤波器参数从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，具体为利用所述滤波器参数从待选滤波器集合包括的M个滤波器中确定出N个滤波器，所述N为小于或等于所述M的正整数；获取所述N个滤波器中每一个滤波器的频响曲线与所述误差频响曲线之间的平均绝对误差值；将所述N个滤波器中对应的平均绝对误差值最小的第一滤波器，添加到用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合中。
在一种实施方式中，确定单元602，还用于利用所述第一滤波器的频响曲线对所述误差频响曲线进行更新，得到更新后的误差频响曲线；若更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值不满足预设条件，则根据更新后的误差频响曲线重新确定滤波器参数；利用重新确定的滤波器参数向所述目标滤波器集合中添加滤波器，直到更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值满足所述预设条件，所述预设条件包括平均绝对误差值小于或等于第一预设阈值，且最大绝对误差值小于或等于第二预设阈值。
根据本发明的一个实施例，图3所示的音频处理方法涉及的步骤S301-S307可以由图6实施例中的各个单元来执行。例如，图3中所示的步骤S301和步骤S302可由图6所示的获取单元601来执行，步骤S303-S305可由图6所示的确定单元602来执行，步骤S306和步骤S307可分别由处理单元603和播放单元604来执行。
根据本发明的另一个实施例，图6所示的音频处理装置中的各个单元可 以分别或全部合并为一个或若干个另外的单元来构成，或者其中的某个(些)单元还可以再拆分为功能上更小的多个单元来构成，这可以实现同样的操作，而不影响本发明的实施例的技术效果的实现。上述单元是基于逻辑功能划分的，在实际应用中，一个单元的功能也可以由多个单元来实现，或者多个单元的功能由一个单元实现。在本发明的其它实施例中，图像处理装置也可以包括其它单元，在实际应用中，这些功能也可以由其它单元协助实现，并且可以由多个单元协作实现。
根据本发明的另一个实施例，可以通过在包括中央处理单元(CPU)、随机存取存储介质(RAM)、只读存储介质(ROM)等处理元件和存储元件的例如计算机的通用计算设备上运行能够执行如图3中所示的音频处理方法涉及的各步骤的计算机程序(包括程序代码)，来构造如图6中所示的音频处理装置，以及来实现本发明实施例的音频处理方法。所述计算机程序可以记载于例如计算机可读记录介质上，并通过计算机可读记录介质装载于上述计算设备中，并在其中运行。
本发明实施例中，音频处理装置可以获取待匹配音频到参考音频的匹配规则，所述匹配规则是根据所述待匹配音频和所述参考音频之间的频谱差异得到的；利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；通过补偿后的音频播放设备播放音频，从而有效地提升了音频播放效果的调节效率，使得音频播放设备能够呈现较优的音频播放效果。
基于上述实施例所示的音频处理方法及音频处理装置，本发明实施例还提供了一种终端。请参见图7，该终端的内部结构至少包括一个或多个处理器701和存储器702。其中，终端内的处理器701和存储器702可通过总线或其他方式连接，在本发明实施例所示图7中以通过总线连接为例。可选地，该终端的内部结构还可以包括一个或多个输入设备703和一个或多个输出设备704。上述处理器701、存储设备702、输入设备703和输出设备704通过总线或其它方式连接，在本发明实施例所示图7中以通过总线连接为例。存储器702用于存储计算机程序，所述计算机程序包括程序指令，处理器701用于执行所述存储器702存储的程序指令。在本发明实施例中，由处理器701 加载并执行计算机可读存储介质中存放的一条或一条以上指令，以实现上述相应实施例中的方法的相应步骤；具体实现中，计算机可读存储介质中的至少一条指令由处理器701加载并执行如下步骤：
获取待匹配音频和参考音频；
获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；
根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异；
利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合；
将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；
利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
通过补偿后的音频播放设备播放音频。
在一个实施例中，所述频谱差异为所述待匹配音频和所述参考音频之间的误差频响曲线，相应地，该至少一条程序指令由该处理器701加载，还用于执行：
根据所述误差频响曲线确定滤波器参数；
利用所述滤波器参数从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，所述待选滤波器集合包括M个滤波器，所述M为大于或等于1的正整数。
在一个实施例中，该至少一条程序指令由该处理器701加载，还用于执行：
获取所述误差频响曲线上的最大幅度值和目标频点，所述目标频点对应的幅度值为所述最大幅度值的二分之一，或者，所述目标频点为预设频点；
利用所述最大幅度值和所述目标频点确定滤波器参数，所述滤波器参数包括截止频率、增益值和品质因数。
在一个实施例中，该至少一条程序指令由该处理器701加载，还用于执行：
利用所述滤波器参数从待选滤波器集合包括的M个滤波器中确定出N个 滤波器，所述N为小于或等于所述M的正整数；
获取所述N个滤波器中每一个滤波器的频响曲线与所述误差频响曲线之间的平均绝对误差值；
将所述N个滤波器中对应的平均绝对误差值最小的第一滤波器，添加到用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合中。
在一个实施例中，该至少一条程序指令由该处理器701加载，还用于执行：
将所述滤波器参数中的截止频率与所述预设频点进行比较，得到比较结果；
根据所述比较结果从待选滤波器集合包括的M个滤波器中确定出N个滤波器。
在一个实施例中，该至少一条程序指令由该处理器701加载，还用于执行：
利用所述第一滤波器的频响曲线对所述误差频响曲线进行更新，得到更新后的误差频响曲线；
若更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值不满足预设条件，则根据更新后的误差频响曲线重新确定滤波器参数；
利用重新确定的滤波器参数向所述目标滤波器集合中添加滤波器，直到更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值满足所述预设条件，所述预设条件包括平均绝对误差值小于或等于第一预设阈值，且最大绝对误差值小于或等于第二预设阈值。
在一个实施例中，所述预设频点包括低频阈值和高频阈值。
该处理器701可以是中央处理单元(Central Processing Unit，CPU)，该处理器还可以是其他通用处理器，即微处理器或者任何常规的处理器。该存储器702可以包括只读存储器和随机存取存储器，并向处理器701提供指令和数据。因此，在此对于处理器701和存储器702不作限定。该输入设备703可以包括音频采集设备，如录音器，或还可以包括触控屏。该输出设备704可以包括音频播放设备，如扬声器，或还可以包括显示屏。其中，该触控屏和显示屏可以集成为触摸显示屏。可选地，该输入设备703和输出设备704，还 可以包括标准的有线接口和/或无线接口。
上述描述的终端和单元的具体工作过程，可以参考前述各个实施例中的相关描述，在此不再赘述。本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明的部分实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (10)

  1. 一种音频处理方法，其特征在于，包括：
    获取待匹配音频和参考音频；
    获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；
    根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异；
    利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合；
    将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；
    利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
    通过补偿后的音频播放设备播放音频。
  2. 根据权利要求1所述的方法，其特征在于，所述频谱差异为所述待匹配音频和所述参考音频之间的误差频响曲线，所述利用频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，包括：
    根据所述误差频响曲线确定滤波器参数；
    利用所述滤波器参数从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，所述待选滤波器集合包括M个滤波器，所述M为大于或等于1的正整数。
  3. 根据权利要求2所述的方法，其特征在于，所述根据所述误差频响曲线确定滤波器参数，包括：
    获取所述误差频响曲线上的最大幅度值和目标频点，所述目标频点对应的幅度值为所述最大幅度值的二分之一，或者，所述目标频点为预设频点；
    利用所述最大幅度值和所述目标频点确定滤波器参数，所述滤波器参数包括截止频率、增益值和品质因数。
  4. 根据权利要求3所述的方法，其特征在于，所述利用所述滤波器参数 从待选滤波器集合中确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，包括：
    利用所述滤波器参数从待选滤波器集合包括的M个滤波器中确定出N个滤波器，所述N为小于或等于所述M的正整数；
    获取所述N个滤波器中每一个滤波器的频响曲线与所述误差频响曲线之间的平均绝对误差值；
    将所述N个滤波器中对应的平均绝对误差值最小的第一滤波器，添加到用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合中。
  5. 根据权利要求1所述的方法，其特征在于，所述利用所述滤波器参数从待选滤波器集合包括的M个滤波器中确定出N个滤波器，包括：
    将所述滤波器参数中的截止频率与所述预设频点进行比较，得到比较结果；
    根据所述比较结果从待选滤波器集合包括的M个滤波器中确定出N个滤波器。
  6. 根据权利要求4或5所述的方法，其特征在于，所述方法还包括：
    利用所述第一滤波器的频响曲线对所述误差频响曲线进行更新，得到更新后的误差频响曲线；
    若更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值不满足预设条件，则根据更新后的误差频响曲线重新确定滤波器参数；
    利用重新确定的滤波器参数向所述目标滤波器集合中添加滤波器，直到更新后的误差频响曲线对应的平均绝对误差值和最大绝对误差值满足所述预设条件，所述预设条件包括平均绝对误差值小于或等于第一预设阈值，且最大绝对误差值小于或等于第二预设阈值。
  7. 根据权利要求3-5任一项所述的方法，其特征在于，所述预设频点包括低频阈值和高频阈值。
  8. 一种音频处理装置，其特征在于，包括：
    获取单元，用于获取待匹配音频和参考音频，并获取所述待匹配音频的频谱分布以及所述参考音频的频谱分布；
    确定单元，用于根据所述待匹配音频的频谱分布以及所述参考音频的频谱分布确定所述待匹配音频和所述参考音频之间的频谱差异，并利用所述频谱差异确定出用于将所述待匹配音频匹配到所述参考音频的目标滤波器集合，将所述目标滤波器集合作为所述待匹配音频到所述参考音频的匹配规则；
    处理单元，用于利用所述匹配规则对音频播放设备进行补偿，以调节所述音频播放设备的音频播放效果；
    播放单元，用于通过补偿后的音频播放设备播放音频。
  9. 一种终端，其特征在于，包括处理器和存储器，所述处理器和存储器相互连接，其中，所述存储器用于存储计算机程序，所述计算机程序包括程序指令，所述处理器被配置用于调用所述程序指令，执行如权利要求1～7任意一项权利要求所述的音频处理方法。
  10. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，所述计算机程序包括程序指令，所述程序指令当被处理器执行时使所述处理器执行如权利要求1～7任意一项所述的音频处理方法。
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