CN111933161A - Method for generating filter parameter of equalizer, audio signal filtering method and equalizer - Google Patents
Method for generating filter parameter of equalizer, audio signal filtering method and equalizer Download PDFInfo
- Publication number
- CN111933161A CN111933161A CN202010685668.XA CN202010685668A CN111933161A CN 111933161 A CN111933161 A CN 111933161A CN 202010685668 A CN202010685668 A CN 202010685668A CN 111933161 A CN111933161 A CN 111933161A
- Authority
- CN
- China
- Prior art keywords
- frequency
- amplitude
- value
- curve
- response
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 118
- 230000005236 sound signal Effects 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000004044 response Effects 0.000 claims abstract description 231
- 238000001228 spectrum Methods 0.000 claims description 34
- 238000005070 sampling Methods 0.000 claims description 33
- 239000013598 vector Substances 0.000 claims description 31
- 238000004364 calculation method Methods 0.000 claims description 17
- 230000000694 effects Effects 0.000 description 20
- 230000008859 change Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/27—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the analysis technique
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
Abstract
The invention discloses a method for generating filter parameters of an equalizer, which comprises the following steps: receiving an operation that a user carries out curve drawing on the amplitude value of the frequency parameter in a preset area of a displayed interface, and acquiring the amplitude value of the curve and a target frequency point corresponding to the amplitude value; generating frequency response curve information containing amplitude values of target frequency points; acquiring an amplitude response value of a frequency response curve represented by frequency response curve information; determining a phase response value; and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value. The frequency that the user can draw the range is not limited in this application, that is to say the user can draw the range of arbitrary frequency point, and the actual demand that can be abundant like this for the precision of the frequency response curve that obtains has obtained promotion, and the filtering parameter for carrying out audio frequency processing based on through the frequency response curve generation then accords with user's requirement more.
Description
Technical Field
The present invention relates to the field of data processing, and in particular, to a method for generating filter parameters of an equalizer, a method for filtering an audio signal, and an equalizer.
Background
When playing music, in order to hear more ideal sound effect, the user can set the playing effect of the music by using an equalizer.
In the prior art, a graphic equalizer is usually used to set the playing effect of music, the graphic equalizer usually divides the frequency into several controllable frequency bands, each frequency band sets a center frequency, and a user can set the amplitude of the center frequency of each frequency band. Based on the principle of the illustrated equalizer, the inventor finds that the illustrated equalizer has at least the following technical problems that the controllable frequency range of the illustrated equalizer is relatively fixed, the number of the controllable frequency ranges of the illustrated equalizer is relatively limited, the frequency set by a user is limited, in this case, the actual requirement of the user cannot be met, and the filtering effect of the generated filtering parameters on audio is not ideal.
Disclosure of Invention
In view of this, the embodiment of the present invention discloses a method for generating filter parameters of an equalizer, where a user may draw the amplitude of any frequency point based on a requirement, so as to meet the actual requirement of the user, improve the accuracy of a frequency response curve, and further obtain a more ideal filtering effect from the filter parameters obtained from the frequency response curve.
In a first aspect, an embodiment of the present invention provides a method for generating filter parameters of an equalizer, including:
receiving the operation of drawing a curve on the amplitude value of the frequency parameter in a preset area of a displayed interface by a user;
acquiring an amplitude value of the curve and a target frequency point corresponding to the amplitude value;
generating frequency response curve information containing the amplitude value of the target frequency point, wherein the frequency response curve information is used for representing a frequency response curve;
acquiring an amplitude response value of a frequency response curve represented by the frequency response curve information;
determining a phase response value;
and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value.
Optionally, the obtaining the amplitude value of the curve and the target frequency point corresponding to the amplitude value includes:
acquiring an amplitude value on the curve;
and acquiring a target frequency point corresponding to each amplitude value on the curve.
Optionally, the generating frequency response curve information including the amplitude value of the target frequency point includes:
under the condition that the target frequency point covers all frequency points in a preset frequency range, generating frequency response curve information based on the corresponding relation between the target frequency point and the amplitude value;
under the condition that the target frequency point does not cover all frequency points in a preset frequency range, determining other frequency points in the preset frequency range except the target frequency point;
determining corresponding amplitude values of other frequency points;
and generating frequency response curve information by utilizing the corresponding relation between other frequency points and the amplitude value and the corresponding relation between the target frequency point and the amplitude value.
Optionally, the obtaining an amplitude response value of the frequency response curve represented by the frequency response curve information includes:
determining the number of sampling frequency and frequency domain control points;
setting sampling intervals based on the sampling frequency and the number of the frequency domain control points;
under the condition that the direction of indicating the frequency in the frequency response curve is represented by a logarithmic axis, determining a sampling frequency point through a sampling interval and a mark point of the logarithmic axis;
and acquiring the amplitude value of the sampled frequency point on the frequency response curve.
Optionally, the determining the phase response value includes:
detecting whether a linear phase curve set by a user exists or not;
if the linear phase curve set by the user does not exist, the phase response value is a preset minimum phase value;
and if the linear phase curve set by the user exists, determining a phase response value based on the linear phase curve set by the user.
Optionally, the generating a filtering parameter for performing filtering processing on the audio signal by using the amplitude response value and the phase response value includes:
in the case that the existence of the linear phase curve set by the user is detected, calculating a frequency response vector based on the amplitude response value and the phase response value;
and obtaining the filter parameters corresponding to the frequency response vectors.
In a second aspect, an embodiment of the present invention provides an audio signal filtering method, including:
determining an audio signal to be processed and a filtering parameter; the filtering parameters are obtained by any one of the filtering methods; the audio signal to be processed is an audio signal which is in a playing state when the filtering parameter is generated or an audio signal obtained after the filtering parameter is generated;
and carrying out filtering processing on the audio signal to be processed by utilizing the filtering parameters.
Optionally, the method further includes:
performing spectrum calculation on the audio signal to be processed to obtain a first spectrogram;
performing spectrum calculation on the audio signal obtained after the filtering processing to obtain a second spectrogram;
and simultaneously displaying the first spectrogram and the second spectrogram in a distinguishing manner.
In a third aspect, an embodiment of the present invention further provides an equalizer, including:
the input interface is used for receiving the operation of drawing a curve on the amplitude value of the frequency parameter in a preset area of the displayed interface by a user;
the first acquisition unit is used for acquiring the amplitude value of the curve and a target frequency point corresponding to the amplitude value;
the frequency response curve information generating unit is used for generating frequency response curve information containing the amplitude value of the target frequency point;
the amplitude response value acquisition unit is used for acquiring the amplitude response value of the frequency response curve represented by the frequency response curve information;
a phase response value determination unit for determining a phase response value;
a filter parameter generating unit configured to generate a filter parameter for performing filter processing on the audio signal using the amplitude response value and the phase response value;
the filtering unit is used for carrying out filtering processing on the audio signal to be processed by utilizing the filtering parameters;
the display interface is used for distinguishing and simultaneously displaying the first frequency spectrum and the second frequency spectrum; the first frequency spectrum is obtained by performing frequency spectrum calculation on the audio signal to be processed; the second frequency spectrum is obtained by performing frequency spectrum calculation on the audio signal obtained after the filtering processing.
Optionally, the frequency response curve information generating unit is configured to generate frequency response curve information including the amplitude value of the target frequency point, and includes:
the frequency response curve information generating unit is specifically configured to generate frequency response curve information based on a corresponding relationship between the target frequency point and the amplitude value when the target frequency point covers all frequency points in a preset frequency range;
under the condition that the target frequency point does not cover all frequency points in a preset frequency range, determining other frequency points in the preset frequency range except the target frequency point;
determining corresponding amplitude values of other frequency points;
and generating frequency response curve information by utilizing the corresponding relation between other frequency points and the amplitude value and the corresponding relation between the target frequency point and the amplitude value.
The embodiment of the invention discloses a method for generating filter parameters of an equalizer, which comprises the following steps: receiving an operation that a user carries out curve drawing on the amplitude value of the frequency parameter in a preset area of a displayed interface, and acquiring the amplitude value of the curve and a target frequency point corresponding to the amplitude value; generating frequency response curve information containing amplitude values of target frequency points; acquiring an amplitude response value of a frequency response curve represented by frequency response curve information; determining a phase response value; and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value. Therefore, in the application, a user can draw a curve, and frequency points which can be included by the curve drawn by the user are not limited, that is, the user can draw the amplitude of any frequency point, so that the actual requirements of the user can be fully met, and the frequency response curve information obtained based on the frequency response curve information contains frequency points with more user requirements, so that the precision of the frequency response curve is improved, and the filtering parameters which are generated through the frequency response curve and used for audio processing better meet the requirements of the user.
In addition, the user only needs to draw a curve for reflecting the relation between the frequency and the amplitude, so that the accuracy of the frequency response curve is improved, the operation is simple for the user, and the complexity of the operation is not increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating a method for generating filter parameters of an equalizer according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a user plotted curve characterizing amplitude variation within a preset region;
fig. 3 is a flow chart illustrating an audio signal filtering method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a comparison of frequency spectra before and after processing an audio signal according to an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of an equalizer provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The applicant has found that the controllable frequency range of the graphic equalizer commonly used in the prior art is relatively fixed and the number of the graphic equalizer is relatively limited, in this case, the practical requirements of users cannot be met, and the filtering effect of the filtering parameters of the audio obtained based on the controllable frequency range is also poor.
In order to obtain more efficient filtering parameters, the applicant has found that it is possible to provide parameters that affect the efficiency of the audio processing, including for example: the center frequency, the quality factor, the descending slope of the cut-off frequency, the number of cascaded filters, etc., for example, the user of the existing parameter equalizer can set the provided parameters according to the requirement.
However, the applicant finds that the application range of the parameter equalizer is not wide, and based on the problem, the applicant finds that the parameters set by the parameter equalizer are very strange to ordinary users through research, and the users cannot effectively control the audio effect by setting the parameters without knowing the meanings of the parameters, so that the users need to fully know the meaning of each parameter before using the parameter equalizer and know the influence of the numerical value corresponding to each parameter on the audio processing effect, and the operation difficulty of the users is greatly increased, so that the parameter equalizer cannot be widely used.
Therefore, how to improve the filtering effect of the filtering parameters under the condition of meeting the actual requirements of the user and not increasing the complexity of the user operation becomes a great problem.
Based on the above problems, the applicant finds that if the frequency which can be set by the user is not limited any more, that is, if the user can draw a curve for reflecting the relationship between the amplitude and the frequency at will without considering the frequency limitation, the actual requirements of the user can be greatly met, and because the user can draw the amplitude value of any frequency point, the precision of a frequency response curve obtained based on the operation of the drawn curve of the user is greatly improved, the filtering effect of the filtering parameter generated by the frequency response curve can better reflect the requirements of the user, and the processing effect of the audio is improved.
In addition, the user only needs to draw a curve reflecting the relation between the frequency point and the amplitude value, and does not need to set many strange parameters, so that the complexity of user operation is simplified compared with a parameter equalizer.
In summary, to solve the above mentioned technical problem, an embodiment of the present invention discloses a method for generating filter parameters of an equalizer, including: receiving an operation that a user carries out curve drawing on the amplitude value of the frequency parameter in a preset area of a displayed interface, and acquiring the amplitude value of the curve and a target frequency point corresponding to the amplitude value; generating frequency response curve information containing amplitude values of target frequency points; acquiring an amplitude response value of a frequency response curve represented by frequency response curve information; determining a phase response value; and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value. Therefore, in the application, the frequency that the user can draw the amplitude is not limited, that is, the user can draw the amplitude of any frequency point, so that the actual requirements of the user can be fully met, and the frequency response curve obtained based on the frequency response curve contains frequency points with more user requirements, so that the precision of the frequency response curve is improved, and the filtering parameters generated based on the frequency response curve and used for audio processing better meet the requirements of the user.
In addition, the user only needs to draw the curve reflecting the relationship between the frequency and the amplitude, so that the accuracy of the frequency response curve is improved, the operation is simple for the user, and the complexity of the operation is not increased.
Referring to fig. 1, a flowchart of a method for generating filter parameters of an equalizer according to an embodiment of the present invention is shown, where in this embodiment, the method includes:
s101: and receiving the operation of drawing a curve on the amplitude value of the frequency parameter in the preset area of the displayed interface by the user.
In this embodiment, the preset area may be represented as an area where a user performs a curve drawing operation, where the preset area includes an amplitude parameter and a frequency parameter, the amplitude parameter may indicate a direction in which the amplitude is drawn to the user, and the frequency parameter may indicate, to the user, a frequency corresponding to the amplitude drawn by the user, that is, the preset area includes the amplitude parameter indicating a direction in which the amplitude value changes and the frequency parameter indicating a direction in which the frequency changes.
For example, the following steps are carried out: the preset area can be represented in a coordinate axis mode, the abscissa of the coordinate axis represents frequency, and the ordinate represents an amplitude value, wherein the unit of the amplitude value can be dB, the value range can be plus or minus 12dB, and 0dB can represent that the amplitude value of the frequency point is not changed. In order to adapt to the auditory characteristics of human ears, the coordinate axis representing the frequency can be a logarithmic axis, and the interval between each frequency point in the logarithmic axis is a logarithmic interval.
It should be noted that, in this embodiment, the user may perform the amplitude plotting operation without considering the limitation of the frequency, and it is understood that the user may perform the plotting operation on the amplitude value at any frequency point in the preset area.
In this embodiment, the user performs the operation of drawing the amplitude without considering the limitation of the frequency, and based on this condition, the embodiment of the present invention provides the following implementation manner to implement the operation of drawing the amplitude by the user: and drawing a curve representing the amplitude change in the preset area by the user.
The preset area can be a circled canvas range, and a user can draw a curve representing amplitude change on the canvas to realize amplitude gain or suppression on any frequency point.
For example, the following steps are carried out: the user can draw a curve representing amplitude change by using a mouse as a brush pen at the PC end or draw a curve representing amplitude change by using a finger as the brush pen at the moving end.
In this embodiment, the preset region for drawing the amplitude variation curve includes not only the amplitude parameter but also the frequency parameter. The user-drawn curve characterizing the amplitude variation may indicate, in addition to representing the amplitude variation, the frequency point corresponding to each amplitude value on the curve. For example, the preset region may be a region including an abscissa axis indicating a frequency and an ordinate axis indicating a magnitude.
For example, the following steps are carried out: referring to fig. 2, a user plots a curve representing a change in amplitude within a preset region, where the abscissa is frequency and the ordinate is amplitude.
It should be noted that the curve drawn by the user needs to satisfy the definition of the function, that is, one frequency point on the curve can only correspond to one amplitude value. For example, if the abscissa is frequency and the ordinate is amplitude, only one point on the curve can correspond to one point on the abscissa, and no one frequency point can correspond to more than two amplitude values.
S102: and acquiring an amplitude value of the curve and a target frequency point corresponding to the amplitude value.
In this step, the amplitude values on the curve are acquired, and the target frequency corresponding to each amplitude on the curve is acquired.
S103: and generating frequency response curve information containing the amplitude value of the target frequency point.
In this embodiment, the generated frequency response curve information is used to represent a frequency response curve, where a relationship between a frequency and an amplitude value represented by the frequency response curve includes a relationship between a frequency point and an amplitude value included in a preset frequency range, and the preset frequency range is a preset frequency range.
In this embodiment, the preset frequency range may be embodied in a preset region displayed for a user to perform an amplitude curve drawing operation, for example, if the preset region is displayed in a form of a coordinate system, a range of a coordinate axis representing a frequency may be set as the preset frequency range.
The frequency points in the curve drawn by the user may include a part of frequency points or all of frequency points within the preset range, that is, the target frequency point may cover a part of or all of the frequency points within the preset frequency range.
In this embodiment, a frequency response curve including the amplitude value of the target frequency point may be generated based on a relationship between the target frequency point and a frequency point included in a preset frequency range, specifically, S103 may include:
and under the condition that the target frequency point covers all frequency points in a preset frequency range, generating frequency response curve information based on the corresponding relation between the target frequency point and the amplitude.
And under the condition that the target frequency point does not cover all frequency points in a preset frequency range, determining other frequency points in the preset frequency range except the target frequency point, determining corresponding amplitude values of the other frequency points, and generating frequency response curve information by utilizing the corresponding relation between the other frequency points and the amplitude and the corresponding relation between the target frequency point and the amplitude.
In this embodiment, for other frequency points not covered by the target frequency point, the amplitude values of the other frequency points may adopt default amplitude values, and the default amplitude values are preset by a technician.
In this embodiment, as can be seen from the above description, the preset region used by the user for the curve drawing operation may be embodied in the form of a coordinate system, and in order to be more suitable for the auditory characteristics of human ears, the coordinate axis representing the frequency in the coordinate system may be a logarithmic axis, and the interval between each frequency point in the logarithmic axis is a logarithmic interval. The frequency response curve information is generated based on the operation result of the user for drawing the curve, and the frequency response curve represented by the generated frequency response curve information can also be embodied in the form of a coordinate system, wherein the coordinate axis representing the frequency can be a logarithmic axis.
S104: and acquiring the amplitude response value of the frequency response curve represented by the frequency response curve information.
In this embodiment, the amplitude response values represent a one-to-one correspondence of frequency and amplitude, where the difference from the frequency response curve is that the frequency response curve is a continuous curve, i.e., the frequency of the frequency response curve is continuous, but the amplitude response values are discrete points.
For example, the following steps are carried out: the amplitude response value may be represented as (amplitude value 1, frequency point 1), (amplitude value 2, frequency point 2), …, (amplitude value n, frequency point n).
The amplitude response value may be obtained by sampling a frequency response curve, specifically, the method includes:
determining the number of sampling frequency and frequency domain control points;
determining sampling intervals corresponding to the sampling frequency and the number of the frequency domain control points;
and sampling on the frequency response curve according to the sampling interval.
For example, the following steps are carried out: assume a sampling rate of fsIf the number of the frequency domain control points is N, the sampling interval deltaFS of the frequency axis is fsand/N, the sampling frequency points can include: 0. deltaFS, 2 deltaFS, …, k deltaFS, …, fs/2。
It should be noted that the sampling intervals in this example are equally spaced, and not logarithmically spaced. According to the sampling interval and the plotted curve, a magnitude response vector obtained by reading the magnitude response value can be represented by Habs (w), and the length of the magnitude response vector is N/2+ 1.
When the coordinate axis of the frequency response curve is a logarithmic axis, the sampling frequency point needs to be determined based on the sampling interval and the frequency marking point of the logarithmic axis.
Specifically, under the condition that the coordinate axis of the frequency response curve is a logarithmic axis, obtaining the amplitude response value of the frequency response curve includes:
determining the number of sampling frequency and frequency domain control points;
setting sampling intervals based on the sampling frequency and the number of the frequency domain control points;
determining sampling frequency points through sampling intervals and mark points of a logarithmic axis;
and acquiring the amplitude value of the sampled frequency point on the frequency response curve.
S105: a phase response value is determined.
In this embodiment, since the human ear is not sensitive to the phase response of music, two alternative processes are generally performed on the phase response curve of the equalizer: minimum phase values and plotted phase curves. In general, the phase response value may adopt a minimum phase value in the case where the user has no requirement for the phase.
However, in the present application, in order to meet the requirements of the user and obtain a better processing effect, in the embodiment, the requirements of the user on the phase are considered, and specifically, the method further includes:
a linear phase curve set by a user is received.
For example, the following steps are carried out: a user may set a linear phase curve in a coordinate system including a frequency and a phase, and if an abscissa axis of the coordinate system is the frequency and an ordinate axis of the coordinate system is the phase angle, the phase may be plotted from an origin in a direction of the ordinate axis representing a change of the phase angle, for example, a straight line in a lower right corner direction is plotted from the origin.
Based on this, the process of determining the phase response value may include:
detecting whether a linear phase curve set by a user exists or not;
if the linear phase curve set by the user does not exist, the phase response value is a preset minimum phase value;
and if the linear phase curve set by the user exists, determining a phase response value based on the linear phase curve set by the user. The phase response value corresponding to the linear phase curve may be a slope of the linear phase curve.
Specifically, the phase response value corresponding to the abscissa coordinate point may be read with reference to a reading manner of the response amplitude value to obtain a phase response vector, where the phase response vector may be represented by hphase (w), and the length of the phase response vector is N/2+ 1.
S106: and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value.
In this embodiment, the generated parameter for filtering the audio signal may be a time domain pulse vector, and the calculation of the time domain pulse vector is related to an amplitude response value and a phase response value, and it can be known from the above description that the phase response value may be a minimum phase value or may be obtained by a linear phase curve set by a user, so that different phase response values correspond to different calculation methods of the time domain pulse vector, specifically, the method includes:
in a first way,
In the case where the phase response value is the minimum phase, the time domain pulse vector may be calculated by the following equations 1) -3):
1)hy(n)＝real(ifft([Habs(w)/20,clip(Habs'(w)/20)]))；
2)weight＝[1；2*ones(N/2-1,1)；1；zeros(N/2-1,1)]；
3)h(n)＝real(ifft(exp(fft(weight.*hy(n)))))；
where h (n) represents a time-domain pulse vector, Habs' (w) represents a vector Habs (w) with the first two elements removed, functions ons (m, n) represent a matrix formed by elements 1 that generates m rows and n columns, functions zeros (m, n) represent a matrix formed by elements 0 that generates m rows and n columns, functions real represent taking real numbers, and symbols represent point-by-point multiplication of vectors.
The second way,
In the case where the phase response value is obtained based on a linear phase curve set by a user, the time-domain pulse vector calculation method may include:
in the case that the existence of the linear phase curve set by the user is detected, calculating a frequency response vector based on the amplitude response value and the phase response value; and calculating a time domain pulse vector by using the frequency response vector.
For example, the following steps are carried out: the frequency response vector can be calculated by equation 4) as follows:
4)H(w)＝Habs(w)*exp(jHphase(w))；
where h (w) represents a frequency response vector, exp represents a natural logarithm, and j is an imaginary number.
And (3) calculating a time domain pulse vector by using the conjugate symmetry of the real number vector in a frequency domain and adopting the following formula 5):
5)h(n)＝ifft([H(w),clip(conj(H'(w)))])；
where ifft denotes the inverse fourier transform, clip denotes the inverse order of the vector, conj denotes the conjugate of the complex number, and H' (w) denotes H (w) with the first two elements removed.
In addition, the applicant has found that since music signals can be regarded as infinitely long time domain signals, the time domain pulse vector h (N) of the equalizer has a length N. In principle, time-domain filtering requires that the music signal and the time-domain pulse vector of the equalizer are convolved with each other. However, this method requires N multiplication and N-1 addition operations per output point, making the method computationally expensive.
In order to further reduce the amount of filtering operations, the applicant has found that the filtering parameters for frequency domain filtering may be generated by an indirect frequency domain filtering method, i.e. by first using the magnitude response value and the phase response value, and filtering the audio signal based on the filtering parameters. The method for filtering the audio signal by frequency domain filtering may include multiple methods, which are not limited in this embodiment, and for example, an overlap-add method or an overlap-save method may be used.
The embodiment has the following beneficial effects:
the beneficial effects are that:
in the embodiment, an operation that a user draws a curve on the amplitude of a frequency vector in a preset area is received, and an amplitude value corresponding to the curve and a target frequency point corresponding to the amplitude value are obtained; generating frequency response curve information containing amplitude values of target frequency points; acquiring an amplitude response value of a frequency response curve represented by frequency response curve information; determining a phase response value; and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value. Therefore, in the present application, the frequency that the user-drawn curve can include is not limited, that is, the user-drawn curve may include any frequency point. Therefore, the frequency response curve obtained based on the method contains frequency points required by more users, so that the precision of the frequency response curve is improved, and the filtering parameters generated based on the frequency response curve and used for audio processing better meet the requirements of the users. Therefore, compared with the graphic equalizer in the prior art, the method and the device overcome the problems that the graphic equalizer has simple parameter setting and the equalization effect is not fine enough.
The beneficial effects are that:
because the user only needs to draw a curve reflecting the relation between the amplitude and the frequency, on one hand, compared with the parameter equalizer in the prior art, the method overcomes the problems that the parameter setting of the parameter equalizer is complicated and the user needs to have a certain professional background of digital signal processing. The method and the device improve the precision of the frequency response curve, are simple to operate for a user, and do not increase the complexity of operation. On the other hand, the curve with good balancing effect in other scenes is convenient for the user to apply to the needed scene, and then the good balancing effect is obtained.
The beneficial effects are three:
in the embodiment, methods such as minimum phase, frequency domain conjugate symmetry, inverse Fourier transform and the like are adopted, and a time domain pulse vector is reversely calculated from a frequency domain to a time domain, so that the problem that a filtering process is complicated because a plurality of filters are required to be cascaded respectively in a traditional graphic equalizer and a parametric equalizer is solved.
Referring to fig. 3, a flow chart of an audio signal filtering method according to an embodiment of the present invention is shown, where the method includes:
s301: the audio signal to be processed and the filter parameters are determined.
The filtering parameter is obtained by the method of S101 to S106, and the specific implementation manner is shown in the embodiment corresponding to fig. 1, which is not limited in this embodiment.
The audio signal to be processed is the audio signal which is in a playing state when the filtering parameter is generated, or the audio signal which is acquired after the filtering parameter is generated.
In this embodiment, the filtering parameters are obtained by adjusting the relevant parameters according to the needs of the user, the user can adjust the relevant parameters to generate the filtering parameters in the audio playing process, and the audio signal in the playing state is filtered after the filtering parameters are generated; or adjusting the related parameters in advance before the audio signal is played to generate filtering parameters, and when the audio signal needs to be played, calling the generated filtering parameters and processing the audio signal based on the filtering parameters.
S302: and carrying out filtering processing on the audio signal to be processed by utilizing the filtering parameters.
In this embodiment, it can be known from the above description that the audio signal may be processed in the time domain, or may be processed in the frequency domain.
In this embodiment, the filtering parameter is obtained based on a result of a curve drawing operation performed by the user on the amplitude of the frequency parameter, where a curve drawn by the user may include all frequency points or a part of frequency points, and frequency response curve information obtained based on the curve may include frequency points required by more users. Therefore, the precision of the frequency response curve represented by the frequency response curve information is improved, and the generated filtering parameters for audio processing better meet the requirements of users. Then, the audio signal is processed based on the filtering parameter, so that the effect which is more ideal and more in line with the user requirement can be obtained.
The applicant has further found that, after the audio signal is processed by the filtering parameter, the user can only perceive whether the audio signal has changed in an audible manner, and to perceive the change, the user needs to know the playing condition of the audio signal before the filtering process is performed, so that the user cannot intuitively perceive what the audio signal has changed after the filtering process, in which case, if the user wants to adjust the audio signal again, the user cannot adjust the filtering parameter again with reference to the previous change.
In order to solve the above problem, in this embodiment, the change of the audio signal before and after the filtering is shown in a spectral manner, specifically, referring to fig. 4, the method further includes:
s401: and carrying out spectrum calculation on the audio signal to be processed to obtain a first spectrogram.
S402: and carrying out spectrum calculation on the audio signal obtained after the filtering processing to obtain a second spectrogram.
S403: and simultaneously displaying the first spectrogram and the second spectrogram in a distinguishing manner.
In this embodiment, the spectrum calculation may be performed on the audio signal by a plurality of methods, which are not limited in this embodiment, and for example, the spectrum calculation may be performed by using a welch spectrum estimation method.
In this embodiment, the first frequency spectrum and the second frequency spectrum may be distinguished by different colors, in practice, in addition to the way of adopting two colors to distinguish the first frequency spectrum from the second frequency spectrum, the way of adopting a solid line and a dotted line may also be adopted to distinguish, and this embodiment does not limit the specific distinguishing way.
Since the embodiment simultaneously distinguishes and shows the changes of the audio signals before and after filtering in a frequency spectrum mode, the instant changes of images and sounds can be intuitively felt by the equalizer, and reference is provided for the user to adjust the relevant parameters for generating the filtering parameters.
It should be noted that, in this embodiment, the user may also use the real-time filtering effect of the equalizer, and specifically, may dynamically adjust the required equalization effect. By drawing a specific pattern, a certain frequency range is extracted (or removed) independently, and music signal components contained in the frequency range can be felt quickly and intuitively.
In this embodiment, the spectrum characteristics of the music signal before and after filtering are displayed differently, and the equalization effect of the music signal is modified by the user. Through instant effect feedback, a user can easily and quickly know the music characteristics corresponding to different frequency ranges, and can also quickly adjust the drawn curve.
Referring to fig. 5, a schematic structural diagram of an equalizer provided in an embodiment of the present invention is shown, and in this embodiment, the equalizer may include: an input interface 501, a first acquisition unit 502, a frequency response curve information generation unit 503, an amplitude response value acquisition unit 504, a phase response value determination unit 505, a filtering parameter generation unit 506, a filtering unit 507, and a display interface 508, wherein,
the input interface 501 is configured to receive an operation of a user for drawing a curve on the amplitude value of the frequency parameter in a preset area of the displayed interface.
A first obtaining unit 502, configured to obtain an amplitude value of the curve and a target frequency point corresponding to the amplitude value.
A frequency response curve information generating unit 503, configured to generate frequency response curve information including the amplitude value of the target frequency point.
An amplitude response value obtaining unit 504, configured to obtain an amplitude response value of a frequency response curve represented by the frequency response curve information.
A phase response value determination unit 505 for determining a phase response value.
A filtering parameter generating unit 506, configured to generate a filtering parameter for performing filtering processing on the audio signal by using the amplitude response value and the phase response value.
The filtering unit 507 is configured to perform filtering processing on the audio signal to be processed by using the filtering parameter.
A display interface 508 for distinguishing between displaying the first spectrum and the second spectrum simultaneously; the first frequency spectrum is obtained by performing frequency spectrum calculation on the audio signal to be processed; the second frequency spectrum is obtained by performing frequency spectrum calculation on the audio signal obtained after the filtering processing.
Optionally, the first obtaining unit 502 is configured to obtain the amplitude value of the curve and the target frequency point corresponding to the amplitude value, and includes:
a first obtaining unit 502, specifically configured to obtain an amplitude value on the curve; and acquiring a target frequency point corresponding to each amplitude value on the curve.
Optionally, the frequency response curve information generating unit 503 is configured to generate frequency response curve information including an amplitude value of the target frequency point, and includes:
the frequency response curve information generating unit 503 is specifically configured to generate frequency response curve information based on a corresponding relationship between the target frequency point and the amplitude value when the target frequency point covers all frequency points in a preset frequency range; under the condition that the target frequency point does not cover all frequency points in a preset frequency range, determining other frequency points in the preset frequency range except the target frequency point; determining corresponding amplitude values of other frequency points; and generating frequency response curve information by utilizing the corresponding relation between other frequency points and the amplitude value and the corresponding relation between the target frequency point and the amplitude value.
Optionally, the amplitude response value obtaining unit 504 is configured to obtain an amplitude response value of a frequency response curve represented by the frequency response curve information, and includes:
an amplitude response value obtaining unit 504, specifically configured to determine a sampling frequency and the number of frequency domain control points; setting sampling intervals based on the sampling frequency and the number of the frequency domain control points; under the condition that the direction of indicating the frequency in the frequency response curve is represented by a logarithmic axis, determining a sampling frequency point through a sampling interval and a mark point of the logarithmic axis; and acquiring the amplitude value of the sampled frequency point on the frequency response curve.
Optionally, the phase response value determining unit 505 is configured to determine a phase response value, and includes:
a phase response value determining unit 505, specifically configured to detect whether a linear phase curve set by a user exists; if the linear phase curve set by the user does not exist, the phase response value is a preset minimum phase value; and if the linear phase curve set by the user exists, determining a phase response value based on the linear phase curve set by the user.
Optionally, the filtering parameter generating unit 506 is configured to generate a filtering parameter for performing filtering processing on the audio signal by using the amplitude response value and the phase response value, and includes:
a filtering parameter generating unit 506, configured to calculate a frequency response vector based on the amplitude response value and the phase response value when it is detected that a linear phase curve set by a user exists; and obtaining the filter parameters corresponding to the frequency response vectors.
Optionally, the filtering unit 507 is configured to perform filtering processing on the audio signal to be processed by using the filtering parameter, and includes:
a filtering unit 507, specifically configured to determine an audio signal to be processed and a filtering parameter; the filter parameters are obtained by any one of the filter parameter generation methods; the audio signal to be processed is an audio signal which is in a playing state when the filtering parameter is generated or an audio signal obtained after the filtering parameter is generated; and carrying out filtering processing on the audio signal to be processed by utilizing the filtering parameters.
In this embodiment, based on the equalizer, a user can draw the amplitude of any frequency point, so that the actual requirements of the user can be fully met, and the frequency response curve obtained based on the equalizer contains frequency points with more user requirements, so that the precision of the frequency response curve is improved, and the filtering parameters generated through the frequency response curve and used for audio processing better meet the requirements of the user.
Those skilled in the art will appreciate that all or part of the steps in the method of implementing the above embodiments may be implemented by hardware instructions associated with a program, which may be stored in a computer-readable storage medium, and when executed, the program includes the following steps (method steps): the storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for generating filter parameters of an equalizer, comprising:
receiving the operation of drawing a curve on the amplitude value of the frequency parameter in a preset area of a displayed interface by a user;
acquiring an amplitude value of the curve and a target frequency point corresponding to the amplitude value;
generating frequency response curve information containing the amplitude value of the target frequency point, wherein the frequency response curve information is used for representing a frequency response curve;
acquiring an amplitude response value of a frequency response curve represented by the frequency response curve information;
determining a phase response value;
and generating a filtering parameter for filtering the audio signal by using the amplitude response value and the phase response value.
2. The method according to claim 1, wherein the obtaining of the amplitude value of the curve and the target frequency point corresponding to the amplitude value comprises:
acquiring an amplitude value on the curve;
and acquiring a target frequency point corresponding to each amplitude value on the curve.
3. The method of claim 1, wherein generating frequency response curve information including the amplitude values of the target frequency points comprises:
under the condition that the target frequency point covers all frequency points in a preset frequency range, generating frequency response curve information based on the corresponding relation between the target frequency point and the amplitude value;
under the condition that the target frequency point does not cover all frequency points in a preset frequency range, determining other frequency points in the preset frequency range except the target frequency point;
determining corresponding amplitude values of other frequency points;
and generating frequency response curve information by utilizing the corresponding relation between other frequency points and the amplitude value and the corresponding relation between the target frequency point and the amplitude value.
4. The method of claim 1, wherein obtaining the magnitude response value of the frequency response curve characterized by the frequency response curve information comprises:
determining the number of sampling frequency and frequency domain control points;
setting sampling intervals based on the sampling frequency and the number of the frequency domain control points;
under the condition that the direction of indicating the frequency in the frequency response curve is represented by a logarithmic axis, determining a sampling frequency point through a sampling interval and a mark point of the logarithmic axis;
and acquiring the amplitude value of the sampled frequency point on the frequency response curve.
5. The method of claim 1, wherein determining the phase response value comprises:
detecting whether a linear phase curve set by a user exists or not;
if the linear phase curve set by the user does not exist, the phase response value is a preset minimum phase value;
and if the linear phase curve set by the user exists, determining a phase response value based on the linear phase curve set by the user.
6. The method of claim 1, wherein generating filter parameters for filtering the audio signal using the magnitude response value and the phase response value comprises:
in the case that the existence of the linear phase curve set by the user is detected, calculating a frequency response vector based on the amplitude response value and the phase response value;
and obtaining the filter parameters corresponding to the frequency response vectors.
7. A method of filtering an audio signal, comprising:
determining an audio signal to be processed and a filtering parameter; the filter parameters are obtained by the method of any one of the preceding claims 1-6; the audio signal to be processed is an audio signal which is in a playing state when the filtering parameter is generated or an audio signal obtained after the filtering parameter is generated;
and carrying out filtering processing on the audio signal to be processed by utilizing the filtering parameters.
8. The method of claim 7, further comprising:
performing spectrum calculation on the audio signal to be processed to obtain a first spectrogram;
performing spectrum calculation on the audio signal obtained after the filtering processing to obtain a second spectrogram;
and simultaneously displaying the first spectrogram and the second spectrogram in a distinguishing manner.
9. An equalizer, comprising:
the input interface is used for receiving the operation of drawing a curve on the amplitude value of the frequency parameter in a preset area of the displayed interface by a user;
the first acquisition unit is used for acquiring the amplitude value of the curve and a target frequency point corresponding to the amplitude value;
the frequency response curve information generating unit is used for generating frequency response curve information containing the amplitude value of the target frequency point;
the amplitude response value acquisition unit is used for acquiring the amplitude response value of the frequency response curve represented by the frequency response curve information;
a phase response value determination unit for determining a phase response value;
a filter parameter generating unit configured to generate a filter parameter for performing filter processing on the audio signal using the amplitude response value and the phase response value;
the filtering unit is used for carrying out filtering processing on the audio signal to be processed by utilizing the filtering parameters;
the display interface is used for distinguishing and simultaneously displaying the first frequency spectrum and the second frequency spectrum; the first frequency spectrum is obtained by performing frequency spectrum calculation on the audio signal to be processed; the second frequency spectrum is obtained by performing frequency spectrum calculation on the audio signal obtained after the filtering processing.
10. The equalizer of claim 9, wherein the frequency response curve information generating unit is configured to generate frequency response curve information including the amplitude value of the target frequency point, and includes:
the frequency response curve information generating unit is specifically configured to generate frequency response curve information based on a corresponding relationship between the target frequency point and the amplitude value when the target frequency point covers all frequency points in a preset frequency range;
under the condition that the target frequency point does not cover all frequency points in a preset frequency range, determining other frequency points in the preset frequency range except the target frequency point;
determining corresponding amplitude values of other frequency points;
and generating frequency response curve information by utilizing the corresponding relation between other frequency points and the amplitude value and the corresponding relation between the target frequency point and the amplitude value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010685668.XA CN111933161A (en) | 2020-07-16 | 2020-07-16 | Method for generating filter parameter of equalizer, audio signal filtering method and equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010685668.XA CN111933161A (en) | 2020-07-16 | 2020-07-16 | Method for generating filter parameter of equalizer, audio signal filtering method and equalizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111933161A true CN111933161A (en) | 2020-11-13 |
Family
ID=73313090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010685668.XA Pending CN111933161A (en) | 2020-07-16 | 2020-07-16 | Method for generating filter parameter of equalizer, audio signal filtering method and equalizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111933161A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113079452A (en) * | 2021-03-30 | 2021-07-06 | 腾讯音乐娱乐科技（深圳）有限公司 | Audio processing method, audio direction information generating method, electronic device, and medium |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7031474B1 (en) * | 1999-10-04 | 2006-04-18 | Srs Labs, Inc. | Acoustic correction apparatus |
| CN101296529A (en) * | 2007-04-25 | 2008-10-29 | 哈曼贝克自动系统股份有限公司 | Sound tuning method and apparatus |
| US20090164905A1 (en) * | 2007-12-21 | 2009-06-25 | Lg Electronics Inc. | Mobile terminal and equalizer controlling method thereof |
| CN102270454A (en) * | 2010-06-07 | 2011-12-07 | 宇达电脑（上海）有限公司 | method and device for improving audio output |
| CN102801444A (en) * | 2012-07-06 | 2012-11-28 | 华为技术有限公司 | Analogue balancing device and method |
| CN102881283A (en) * | 2011-07-13 | 2013-01-16 | 三星电子（中国）研发中心 | Method and system for processing voice |
| CN105992100A (en) * | 2015-02-12 | 2016-10-05 | 电信科学技术研究院 | Method and device for determining preset parameter set of audio equalizer (AEQ) |
| US20170126194A1 (en) * | 2015-10-28 | 2017-05-04 | Jean-Marc Jot | Spectral correction of audio signals |
| CN107615651A (en) * | 2015-03-20 | 2018-01-19 | 因诺沃Ip有限责任公司 | System and method for improved audio perception |
| CN109314499A (en) * | 2016-06-07 | 2019-02-05 | 杜比实验室特许公司 | Audio balance system and method |
| CN110191396A (en) * | 2019-05-24 | 2019-08-30 | 腾讯音乐娱乐科技（深圳）有限公司 | A kind of audio-frequency processing method, device, terminal and computer readable storage medium |
| WO2020078237A1 (en) * | 2018-10-15 | 2020-04-23 | 华为技术有限公司 | Audio processing method and electronic device |
-
2020
- 2020-07-16 CN CN202010685668.XA patent/CN111933161A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7031474B1 (en) * | 1999-10-04 | 2006-04-18 | Srs Labs, Inc. | Acoustic correction apparatus |
| CN101296529A (en) * | 2007-04-25 | 2008-10-29 | 哈曼贝克自动系统股份有限公司 | Sound tuning method and apparatus |
| US20090164905A1 (en) * | 2007-12-21 | 2009-06-25 | Lg Electronics Inc. | Mobile terminal and equalizer controlling method thereof |
| CN102270454A (en) * | 2010-06-07 | 2011-12-07 | 宇达电脑（上海）有限公司 | method and device for improving audio output |
| CN102881283A (en) * | 2011-07-13 | 2013-01-16 | 三星电子（中国）研发中心 | Method and system for processing voice |
| CN102801444A (en) * | 2012-07-06 | 2012-11-28 | 华为技术有限公司 | Analogue balancing device and method |
| CN105992100A (en) * | 2015-02-12 | 2016-10-05 | 电信科学技术研究院 | Method and device for determining preset parameter set of audio equalizer (AEQ) |
| CN107615651A (en) * | 2015-03-20 | 2018-01-19 | 因诺沃Ip有限责任公司 | System and method for improved audio perception |
| US20170126194A1 (en) * | 2015-10-28 | 2017-05-04 | Jean-Marc Jot | Spectral correction of audio signals |
| CN109314499A (en) * | 2016-06-07 | 2019-02-05 | 杜比实验室特许公司 | Audio balance system and method |
| WO2020078237A1 (en) * | 2018-10-15 | 2020-04-23 | 华为技术有限公司 | Audio processing method and electronic device |
| CN110191396A (en) * | 2019-05-24 | 2019-08-30 | 腾讯音乐娱乐科技（深圳）有限公司 | A kind of audio-frequency processing method, device, terminal and computer readable storage medium |
Non-Patent Citations (3)
| Title |
|---|
| ARNAB GHOSH ET AL.: "Prefilter-Equalizer Based Structure : A New Design Strategy for Narrow-band FIR Filters", 《ASPCON》, 31 December 2018 (2018-12-31) * |
| 彭仕玉;张国云;李宏民;: "一类可变参数数字均衡器的设计", 现代电子技术, no. 07, 1 April 2011 (2011-04-01) * |
| 赵碧杉;曾攀;谢桂辉;黄根春;张望先;: "数字幅频均衡功率放大器设计", 电子制作, no. 01, 1 January 2010 (2010-01-01) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113079452A (en) * | 2021-03-30 | 2021-07-06 | 腾讯音乐娱乐科技（深圳）有限公司 | Audio processing method, audio direction information generating method, electronic device, and medium |
| CN113079452B (en) * | 2021-03-30 | 2022-11-15 | 腾讯音乐娱乐科技（深圳）有限公司 | Audio processing method, audio direction information generating method, electronic device, and medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8321206B2 (en) | Transient detection and modification in audio signals | |
| US9307322B2 (en) | Systems and methods of frequency response correction for consumer electronic devices | |
| JP4262597B2 (en) | Sound system | |
| US7508948B2 (en) | Reverberation removal | |
| US8103020B2 (en) | Enhancing audio signals by nonlinear spectral operations | |
| EP1956865A2 (en) | Filter coefficient calculation device, filter coefficient calculation method, control program, computer-readable storage medium and audio signal processing apparatus | |
| KR20150128753A (en) | Equalization filter coefficient determinator, apparatus, equalization filter coefficient processor, system and methods | |
| CN101868823A (en) | High range interpolation device and high range interpolation method | |
| US9559658B2 (en) | Filter coefficient group computation device and filter coefficient group computation method | |
| US10753965B2 (en) | Spectral-dynamics of an audio signal | |
| CN112565981B (en) | Howling suppression method, howling suppression device, hearing aid, and storage medium | |
| EP3980994A1 (en) | Sound modification based on frequency composition | |
| CN105792072A (en) | Sound effect processing method and device and terminal | |
| EP2689419B1 (en) | Method and arrangement for damping dominant frequencies in an audio signal | |
| JP6556463B2 (en) | Filter generation device, filter generation method, and filter generation program | |
| CN111933161A (en) | Method for generating filter parameter of equalizer, audio signal filtering method and equalizer | |
| CN106941006B (en) | Method, apparatus and system for separation and bass enhancement of audio signals | |
| US8223990B1 (en) | Audio noise attenuation | |
| WO2023016208A1 (en) | Audio signal compensation method and apparatus, earbud, and storage medium | |
| US11594241B2 (en) | Method and electronic device for formant attenuation/amplification | |
| CN103580630A (en) | Automatic loudness control | |
| Mecklenburg et al. | subjEQt: Controlling an equalizer through subjective terms | |
| CN110580912B (en) | Music visualization method, device and system | |
| US9680437B2 (en) | Equalization contouring by a control curve | |
| US20170236529A1 (en) | Audio signal processing device, audio signal processing method, and audio signal processing program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |