CN111698629B - Calibration method and apparatus for audio playback device, and computer storage medium - Google Patents
Calibration method and apparatus for audio playback device, and computer storage medium Download PDFInfo
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- CN111698629B CN111698629B CN201910196156.4A CN201910196156A CN111698629B CN 111698629 B CN111698629 B CN 111698629B CN 201910196156 A CN201910196156 A CN 201910196156A CN 111698629 B CN111698629 B CN 111698629B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention discloses a calibration method, a calibration device and a computer storage medium of audio playback equipment, wherein the method comprises the following steps: controlling a loudspeaker to play an audio signal; acquiring a plurality of first sound signals picked up by a plurality of microphones when an audio signal is played by an audio playback device; for each microphone in the plurality of microphones, respectively obtaining a first time domain transfer function of a corresponding first sound signal relative to the audio signal; obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling values of the plurality of first time domain transfer functions at a plurality of set sampling points; and determining the sound effect compensation parameter of the audio playback equipment according to the characteristic parameter value.
Description
Technical Field
The present invention relates to the field of acoustic technologies, and in particular, to a method and an apparatus for calibrating an audio playback device, and a computer storage medium.
Background
An audio reproducing apparatus is an apparatus that converts an audio signal into a sound signal and radiates the sound signal into a space in the form of a sound wave, and has been widely used in daily life and work of people.
When an audio playback device is radiating sound signals into space in the form of sound waves, some items in the environment in which the audio playback device is located may reflect or absorb the sound waves. For example, when the environment in which the audio playback device is located is a room, walls, windows, floors, furniture, and the like in the room absorb and reflect sound waves radiated by the audio playback device. This results in a sound signal received by the human ear that differs significantly from the sound signal emitted by the audio playback device, i.e. the human ear hears distorted sound.
Currently, to solve the above distortion problem, an external calibration device is generally used to calibrate the sound signal emitted from the audio playback device. However, this calibration method is cumbersome and has low flexibility. For example, when the external calibration device is a mobile phone, the mobile phone needs to be placed at the ear of the listener, a microphone on the mobile phone is used to collect an audio signal played by the audio playback device, and then a special application program on the mobile phone is used to calibrate the sound signal emitted by the audio playback device according to the collected audio signal, so that the whole calibration process takes 2-3 minutes. Meanwhile, when the location of the listener changes, the above steps need to be re-executed to re-perform the calibration.
Disclosure of Invention
It is an object of the present invention to provide a new method of calibrating an audio playback device.
According to a first aspect of the present invention, there is provided a calibration method of an audio playback apparatus including a speaker and a plurality of microphones, wherein the calibration method includes:
controlling the loudspeaker to play an audio signal;
acquiring a plurality of first sound signals picked up by the plurality of microphones when the audio playback device plays the audio signal;
for each microphone of the plurality of microphones, obtaining a corresponding first time-domain transfer function of the first sound signal relative to the audio signal;
obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling values of the first time domain transfer functions at a plurality of set sampling points;
and determining a sound effect compensation parameter of the audio playback equipment according to the characteristic parameter value.
Optionally, before obtaining a characteristic parameter value representing a reflection characteristic of an environment in which the audio playback device is located according to a plurality of sampling values of the first time-domain transfer function at a plurality of set sampling points, the method further includes:
acquiring a reflection characteristic function, wherein the reflection characteristic function represents a mapping relation between a plurality of first time domain transfer functions and the characteristic parameter value; and
the obtaining of the characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback device according to the sampling values of the first time domain transfer function at a plurality of set sampling points comprises:
and obtaining the characteristic parameter value according to the reflection characteristic function and the sampling values of the plurality of first time domain transfer functions at a plurality of set sampling points.
Optionally, before obtaining a characteristic parameter value representing a reflection characteristic of a reflection environment in which the audio playback device is located according to a plurality of sampling values of the first time-domain transfer function at a plurality of set sampling points, the method further includes:
for each microphone of the plurality of microphones, obtaining a second time-domain transfer function of the corresponding second sound signal relative to the audio signal; the second sound signal is a sound signal picked up by each microphone of the plurality of microphones when the audio playback device is playing the audio signal in a reflection-free environment; and
the obtaining of the characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback device according to the sampling values of the first time domain transfer function at the set sampling points further comprises:
and obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling values of each first time domain transfer function and each second time domain transfer function at a plurality of set sampling points.
Optionally, the method, for each of the plurality of microphones, obtaining a first time-domain transfer function of the corresponding first sound signal relative to the audio signal, includes:
for each microphone of the plurality of microphones, obtaining an original frequency-domain transfer function of the corresponding first sound signal relative to the audio signal;
according to a preset cut-off frequency, performing low-pass filtering on each original frequency domain transfer function to obtain a filtered frequency domain transfer function;
and according to each filtered frequency domain transfer function, respectively obtaining a first time domain transfer function of the corresponding first sound signal relative to the audio signal by utilizing inverse Fourier transform.
Optionally, before obtaining the corresponding first time-domain transfer functions of the first sound signals relative to the audio signals, the method further includes:
intercepting a first time domain transfer function of each of the first sound signals relative to the audio signal;
and modifying the corresponding first time domain transfer function into the intercepted first time domain transfer function.
Optionally, the step of obtaining a characteristic parameter value representing a reflection characteristic of a reflection environment in which the audio playback apparatus is located according to sampling values of a plurality of set sampling points of the plurality of first time-domain transfer functions includes:
according to sampling frequencies corresponding to the set sampling points, filtering sampling values of the first time domain transfer functions at the set sampling points;
and obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling value after the filtering processing.
Optionally, the step of determining a sound effect compensation parameter of the audio playback device according to the characteristic parameter value includes:
determining the type of the reflection environment corresponding to the characteristic parameter value according to the characteristic parameter value;
determining a sound effect compensation parameter corresponding to the reflection environment type according to the reflection environment type;
and taking the sound effect compensation parameter corresponding to the reflection environment type as the sound effect compensation parameter of the audio playback equipment.
Optionally, the reflective environment type is one of a non-reflective surface environment, a single-reflective surface environment, a double-reflective surface environment, a triple-reflective surface environment, and other reflective surface environments.
Optionally, the method further includes:
compensating the audio signal played by a loudspeaker in the audio playback equipment according to the sound effect compensation parameter;
or outputting a compensation prompt representing whether compensation is carried out or not according to the sound effect compensation parameter, and compensating the audio signal played by a loudspeaker in the audio playback equipment according to the sound effect compensation parameter when the compensation prompt representing compensation is received.
According to a second aspect of the present invention, there is provided a calibration apparatus for an audio playback device, comprising a memory for storing computer instructions and a processor for retrieving the computer instructions from the memory to perform the method as any one of the first aspect provides.
According to a third aspect of the present invention, there is provided a computer storage medium storing computer instructions which, when executed by a processor, implement the method as any one of the first aspect provides.
In the calibration method of the audio playback equipment provided by the invention, on one hand, the audio playback equipment can calibrate the audio signal played by the loudspeaker of the audio playback equipment without depending on external calibration equipment. This may reduce the operational complexity during calibration. On the other hand, the acoustics compensation parameter of the audio playback device is determined according to the characteristic parameter value representing the reflection characteristic of the environment where the audio playback device is located, that is, the whole reflection environment where the audio playback device is located is considered in the calibration process, not only the reflection environment in the direction from the loudspeaker of the audio playback device to the listening position of the listener, so that even if the listening position of the listener changes, the acoustics compensation parameter of the audio playback device does not need to be determined again. This increases the flexibility of the calibration of the audio playback device, increases the efficiency of the calibration, and improves the listening experience for the user.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart illustrating a calibration method of an audio playback apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a first time domain transfer function of an audio playback device including 6 microphones in a desktop environment according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a second mapping relationship, according to an embodiment of the invention;
fig. 4 is a schematic diagram of a first time domain transfer function of an audio playback device including 6 microphones in a wall proximity environment according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a calibration apparatus of an audio playback device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
< calibration method of Audio playback apparatus >
The execution subject of the calibration method of the audio playback equipment provided by the invention is the calibration device of the audio playback equipment, and the device can be arranged inside various audio playback equipment (such as a smart sound box). The apparatus may also be a variety of electronic devices including an audio playback device. Alternatively, the apparatus may also be a hardware module and/or a software module in an audio playback device or the aforementioned electronic device. In the following embodiments, the method provided in the present application will be described by taking an audio playback apparatus as an example of an execution subject of the calibration method for the audio playback apparatus.
An embodiment of the present application provides a calibration method for an audio playback device, where the audio playback device includes a speaker and a plurality of microphones, as shown in fig. 1, the method includes the following steps S101 to S105:
and S101, controlling a loudspeaker to play an audio signal.
Specifically, the audio playback device in this embodiment may be a smart speaker, an earphone, or the like. When the calibration method of the audio playback device provided by the present invention is implemented, the audio signal played by the speaker of the audio playback device itself may be an audio signal selected by a user, or may be a segment of audio signal for calibration stored by the audio playback device before shipment. Wherein the audio signal may be a piece of music or a piece of broadcast, etc.
It should be noted that, in the embodiments of the present application, the reference to "a plurality" means at least two. Meanwhile, the plurality of microphones included in the audio playback apparatus may be independent microphones, and the microphones work together to constitute a microphone array.
S102, when the audio playback equipment plays the audio signals, a plurality of first sound signals picked up by a plurality of microphones are acquired.
Specifically, the acquired plurality of first sound signals are acquired in a reflection environment. The reflection environment refers to the current playing environment of the audio playback device, and is also the environment in which the calibration method provided by the present embodiment is performed. In one example, the reflective environment may be: a suspended environment without a reflecting surface, a ground with only one reflecting surface, and the like.
It should be noted that the first sound signal is a sound signal picked up by each microphone, and includes: the audio signal played by the loudspeaker passes through the reflection environment and then is transmitted to the sound signal of the microphone, and the sound signal which is not passed through the reflection environment by the loudspeaker and then reaches the microphone is transmitted to the microphone.
And S103, respectively obtaining a first time domain transfer function of the corresponding first sound signal relative to the audio signal for each microphone.
It should be noted that how to calculate the first time-domain transfer function of the first sound signal relative to the audio signal in this embodiment is well known to those skilled in the art, and therefore, the relevant content of how to calculate the first time-domain transfer function is not described herein again.
And S104, obtaining a characteristic parameter value representing the reflection characteristic of the environment where the audio playback equipment is located according to the sampling values of the plurality of first time domain transfer functions at the plurality of set sampling points.
Specifically, when the above-mentioned S104 is executed, the sampling values of the plurality of first time domain transfer functions at the plurality of set sampling points need to be determined first. Specifically, the method comprises the following steps: and respectively bringing the time value corresponding to each sampling point in the plurality of set sampling points into each first time domain transfer function in the plurality of first time domain transfer functions to obtain the sampling value.
In the implementation of S104, all the sampled values are substituted into the pre-constructed reflection characteristic function, so as to obtain a characteristic parameter value representing the reflection characteristic of the environment where the audio playback apparatus is located. That is, before S104, the method further includes:
s1041, obtaining a reflection characteristic function, wherein the reflection characteristic function represents a mapping relation between a plurality of first time domain transfer functions and characteristic parameter values.
Further, S104 described above may be replaced with: and obtaining characteristic parameter values according to the reflection characteristic functions and the sampling values of the plurality of first time domain transfer functions at the plurality of set sampling points.
In one embodiment, an expression of the reflection characteristic function may be:
wherein M in the above expression refers to the number of microphones; n refers to the number of sampling points; k refers to the serial number of the microphone; n refers to the order of sampling point correspondences; h isak(n) refers to the sampling value of the microphone with the sequence number k when the order of the sampling points is n for the first time domain transfer function; h isk(n) refers to the sample value of the microphone with sequence number k at the time when the order of the sample points is n for the second time-domain transfer function. Wherein the second time domain transfer function is: under the non-reflection environment, the audio playback device has a time domain transfer function corresponding to the audio signal played by the loudspeaker and the sound signal picked up by each microphone when the loudspeaker plays the audio signal. f is the characteristic parameter value.
Specifically, the principle of constructing the reflection characteristic function is as follows:
for an audio playback device, it is possible to acquire an audio signal played by a speaker of the audio playback device, a sound signal picked up by each microphone during the playing of the audio signal by the speaker, and a time-domain transfer function (denoted as h) of the audio signal with respect to each sound signalak). Moreover, for each microphone, the sound signal picked up by the microphone includes the sound signal that is transmitted to the microphone after the audio signal played by the speaker passes through the reflection environment. That is, hakCan reflect the reflection characteristics of the environment in which the audio playback device is emitted. I.e. can be according to hakThe above-described reflection characteristic function is constructed.
Meanwhile, for each microphone, the sound signals picked up by the microphone include the sound signals of the audio signals played by the loudspeaker which are transmitted to the microphone after passing through the reflection environment and the sound signals of the microphones which are directly transmitted from the loudspeaker to the microphone without passing through the reflection environment, so that h isakThe time-domain transfer function (recorded as h) of the sound signal transferred to the microphone after passing through the reflection environment relative to the audio signalak-hk) And the sound signal of the direct microphone is relative to the soundTime domain transfer function (denoted as h) of the frequency signalk) Is expressed by the sum of (1). Also, when the reflection environment does not absorb the reflection of the aforementioned audio signal, it is known that the microphone in the audio reproducing apparatus will hardly receive the sound signal transmitted to the microphone through the reflection environment, and at this time, hakAnd hkAre close to, in particular, hakAnd hkThe sample values at the same sample point are close. Conversely, when the reflection environment is more complicated, such as the more reflection surfaces, the larger transmission distance and the larger reflectivity, the microphone can receive more and more sound signals transmitted to the microphone after passing through the reflection environment, and then hakAnd hkMore and more widely differing, in particular, hakAnd hkThe sampled values at the same sampling point are more and more different. Therefore, h can be corresponding to each microphoneakAnd hkThe difference between the sampled values at the same sample point (denoted as Δ h)k(n)) to quantify a characteristic parameter value of a reflection characteristic of the reflection environment in which the audio playback device is located. Meanwhile, it can be obtained that Δ h is more complicated as the reflection environment is more complicatedkThe larger the value of the characteristic parameter is reflected by (n).
It will be appreciated that the above may be:
the deformation is as follows:
based on the above, h needs to be determined before S104k(n) of (a). That is, the calibration method of the audio playback device according to the present embodiment further includes, before S104, the following S1042:
and S1042, for each microphone in the plurality of microphones, respectively obtaining a second time-domain transfer function of the corresponding second sound signal relative to the audio signal. Wherein the second sound signal is a sound signal picked up by each of the plurality of microphones when the audio playback device is playing the audio signal in a reflection-free environment.
It should be noted that, since the sound signal picked up by each microphone only includes the sound signal from the speaker directly to the microphone when the audio playback apparatus is in the non-reflection environment, the second time-domain transfer function can be taken as hk. In addition, the non-reflective environment may be a floating environment without a reflective surface.
Based on this, the above S104 may also be replaced by: and obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling values of each first time domain transfer function and each second time domain transfer function at a plurality of set sampling points.
It is further noted that in implementing S1042 as described above, in one embodiment, the audio playback device may be placed in a reflection-free environment to determine the second time-domain transfer function as described above.
In another embodiment, when the audio signal to be played by the speaker is a segment of the audio signal stored by the audio playback device before the factory shipment for calibration, the second time-domain transfer function may be tested and stored in the audio playback device before the factory shipment of the audio playback device. When the audio playback apparatus implements S1042 described above, the second time-domain transfer function described above may be directly read. This eliminates the need for the user to first place the audio playback device in a reflection-free environment.
In one embodiment, an expression of the reflection characteristic function may be further:
wherein M in the above expression refers to the number of microphones; n refers to the number of sampling points; k refers to the serial number of the microphone; n refers to the order of sampling point correspondences; h isak(n) refers to the sampling value of the microphone with the sequence number k when the order of the sampling points is n for the first time domain transfer function; h isk(n) refers to the sampling of a microphone with sequence number k at the order of the sampling points n for the second time-domain transfer functionA value; λ is a parameter greater than 0. Wherein the second time domain transfer function is: under the non-reflection environment, the audio playback device has a time domain transfer function corresponding to the audio signal played by the loudspeaker and the sound signal picked up by each microphone when the loudspeaker plays the audio signal. f is the characteristic parameter value.
Specifically, based on the construction principle of the previous reflection feature function, the construction principle of the reflection feature function in this embodiment is as follows:
specifically, in general, when the orientations of each microphone in the audio playback device are not all the same, this will result in that the specific reflection environments (a part of the reflection environments in which the audio playback device is located) corresponding to different microphones are not all the same, and further result in that the sound signals picked up by different microphones, including the sound signals that are passed to the microphones after passing through the reflection environments, are not all the same. Correspondingly, the time-domain transfer functions of the sound signals transferred to the microphones after passing through the reflection environment, which correspond to different microphones, are not completely the same relative to the audio signals. Therefore, the corresponding delta h of different microphones can be determinedk(n) to quantify the difference in the specific reflection environment at different orientations. Meanwhile, as can be seen from the above, Δ h is larger when the difference of the specific reflection environments in different directions is largerkThe greater the difference between (n). Wherein the aforementioned differences may be quantified by standard deviation, variance, or euclidean distance. In the reflection characteristic function in the present embodiment, the foregoing difference is expressed by a variance.
It will be appreciated that the above may be:
in one embodiment, the reflection characteristic function may be further transformed according to the above into the following expression:
wherein, the above-mentioned S1And S2Is a monotonically increasing function in the time domain. For example, S1＝x，S2＝x2Wherein x is greater than 0.
In one embodiment, an expression of the reflection characteristic function may be further:
specifically, the principle of constructing the reflection characteristic function is as follows: typically, each microphone in an audio playback device is located at the same distance from the respective loudspeaker. Therefore, the sound signals picked up by the microphones include the same sound signals which are directly transmitted to the microphones from the loudspeaker without passing through the reflection environment, and therefore, h corresponds to each microphonek(n) are all the same. Based on this, Δ h in any of the reflection characteristic functions described above can be setk(n) deformation of hak(n) of (a). Taking the last expression as the reflection characteristic function, h may not be neededkThe measurement is performed. That is, it should be understood that according to one embodiment of the present disclosure, the first time domain transfer function may be directly utilized to obtain the required characteristic parameter value without the second time domain transfer function.
And S105, determining a sound effect compensation parameter of the audio reproduction equipment according to the characteristic parameter value.
In one example, the above S105 can be implemented by the following S1051-S1053:
s1051, according to the characteristic parameter value, determining the reflection environment type corresponding to the characteristic parameter value.
In one embodiment, S1051 may be implemented according to a first mapping relationship created in advance to reflect a correspondence relationship between the characteristic parameter value and the reflection environment type. The specific creation process of the first mapping relation is as follows:
step one, creating a plurality of different reflection environments, illustratively, creating 5 different types of reflection environments, which are: non-reflective environments (e.g., overhead), single reflective environments (e.g., flat table top or flat wall), dual reflective environments (e.g., flat table top against wall), triple reflective environments (e.g., corner), other reflective environments (e.g., bookshelf).
Step two, in each reflection environment, controlling an audio playback device to play audio signals, and simultaneously acquiring sound signals picked up by each microphone; for each microphone, respectively obtaining a time domain transfer function of the corresponding sound signal relative to the audio signal; and calculating a corresponding characteristic parameter value by using the reflection characteristic function in the step S104 according to the sampling value of each time domain transfer function at the set sampling point, and taking the characteristic parameter value as a corresponding preset characteristic parameter value in the reflection environment.
And step three, respectively placing the audio playback equipment in the 5 different types of reflection environments, and repeating the process of the step two to finally obtain a plurality of preset characteristic parameter values corresponding to the plurality of reflection environments, and taking the corresponding relation between each reflection environment and the corresponding preset characteristic parameter value as the first mapping relation in the step S1051.
Based on the above, the specific implementation manner of S1051 may be: and searching a preset characteristic parameter value closest to the characteristic parameter value obtained after S104 is executed from the first mapping relation, and taking the reflection environment type corresponding to the searched preset characteristic parameter value as the reflection environment type corresponding to the characteristic parameter value.
Illustratively, the third step can be replaced by the following steps: and (3) respectively placing the audio playback equipment in the 5 different types of reflection environments, and repeating the process of the step two to finally obtain a plurality of preset characteristic parameter values corresponding to the plurality of reflection environments. And establishing preset ranges for a plurality of preset characteristic parameter values corresponding to a plurality of reflection environments according to a clustering algorithm, and corresponding each preset range to the corresponding reflection environment type to obtain a first mapping relation.
For example, it is assumed that the boundary values of the preset ranges sequentially corresponding to the above-mentioned 5 types of reflection environments are a, b, c, d, and e sequentially. The first mapping relationship may be expressed as:
| preset range | Type of |
| 0≤X≤a | Non-reflecting surface environment |
| a<X≤b | Single reflector environment |
| b<X≤c | Dual reflector environment |
| c<X≤d | Three reflecting surface environment |
| d<X≤e | Other reflecting surface environments |
Based on the above, the specific implementation manner of S1051 may be as follows: and searching a preset range in which the characteristic parameter value obtained after the step S104 is executed from the first mapping relation, and taking the reflection environment type corresponding to the searched preset range as the reflection environment type corresponding to the characteristic parameter value.
And S1052, determining a sound effect compensation parameter corresponding to the reflection environment type according to the reflection environment type.
In an embodiment, S1052 may be implemented according to a second mapping relationship created in advance for reflecting a corresponding relationship between the reflection environment type and the sound effect compensation parameter. The specific creation process of the second mapping relationship is as follows:
step one, continuing to take the 5 types of reflection environments as an example, for each of the 5 types of reflection environments, placing the audio playback device in the preset reflection environment, controlling a speaker of the audio playback device to play an audio signal, and acquiring a sound signal picked up by each microphone.
And step two, compensating the audio signal played by the loudspeaker according to the preset sound effect compensation parameter.
And step three, comparing the difference between the sound signal picked up by each microphone and the audio signal played by the loudspeaker after compensation, and if the difference is within the allowable error range, taking the sound effect compensation parameter preset in the step two as the sound effect compensation parameter in the reflection environment. And conversely, changing the preset sound effect compensation parameter, repeating the second step and the third step until the difference is within the allowable error range, and taking the final sound effect compensation parameter as the sound effect compensation parameter under the reflection environment.
And step four, taking the corresponding relation between each reflection environment and the corresponding sound effect compensation parameter as a second mapping relation.
Based on the above, the implementation manner of the foregoing S1052 is to search, in the second mapping relationship, a reflection environment having the same type as the reflection environment determined after the foregoing S1051 is executed, and determine the sound effect compensation parameter corresponding to the searched reflection environment as the sound effect compensation parameter corresponding to the reflection environment type.
And S1053, using the sound effect compensation parameter corresponding to the reflection environment type as the sound effect compensation parameter of the audio playback equipment.
In another embodiment, the second mapping relationship may be created based on empirical values.
For example, when the reflection environment is a corner environment having three reflection surfaces, it may be determined that the loudness of the low-frequency signal in the sound signal picked up by the microphone is greatly increased, and therefore, the loudness of the audio signal played by the speaker in the low-frequency band may be reduced (for example, the loudness of the audio signal played by the speaker in the low-frequency band is reduced by 5 dB). And the adjustment parameters for adjusting the audio signals played by the loudspeaker at the moment are used as sound effect compensation parameters corresponding to the corner environment.
For example, when the reflection environment is a flat desktop environment with two reflection surfaces near a wall, it may be determined that the loudness of the low-frequency signal in the sound signal picked up by the microphone is increased, and therefore, the loudness of the audio signal played by the speaker in the low-frequency band may be reduced by a small amplitude (for example, the loudness of the audio signal played by the speaker in the low-frequency band is reduced by 2 dB). And the adjustment parameters for adjusting the audio signals played by the loudspeaker at the moment are used as sound effect compensation parameters corresponding to the corner environment.
For example, in a floating environment, it may be determined that the loudness of the low-frequency signal in the sound signal picked up by the microphone is reduced, and therefore, the loudness of the audio signal played by the speaker in the low-frequency band may be increased (for example, the loudness of the audio signal played by the speaker in the low-frequency band is increased by 2 dB). And the adjustment parameters for adjusting the audio signals played by the loudspeaker at the moment are used as the sound effect compensation parameters corresponding to the suspension environment.
In another embodiment, in order to reduce the operation load of the audio playback device, the above S105 may also be implemented by a preset mapping relationship. The mapping relation is a corresponding relation between a characteristic parameter value and a sound effect compensation parameter obtained by combining the first mapping relation and the second mapping relation.
In an example, the calibration method for an audio playback device provided in the embodiment of the present application further includes the following S106 a:
s106, compensating the audio signal played by the loudspeaker in the audio playback equipment according to the sound effect compensation parameter.
Or further comprising either S106 b:
s106, 106b, according to the sound effect compensation parameters, outputting a compensation prompt representing whether compensation is carried out, and when the compensation prompt representing compensation is received, compensating the audio signals played by the loudspeaker in the audio playback equipment according to the sound effect compensation parameters.
The compensation prompt can be realized by voice, light flashing or lights with different colors.
It should be noted that, based on the above manner, the personalized requirements of the user can be satisfied.
In the calibration method of the audio playback equipment provided by the invention, on one hand, the audio playback equipment can calibrate the audio signal played by the loudspeaker of the audio playback equipment without depending on external calibration equipment. This may reduce the operational complexity during calibration. On the other hand, the acoustics compensation parameter of the audio playback device is determined according to the characteristic parameter value representing the reflection characteristic of the environment where the audio playback device is located, that is, the reflection environment of the whole environment where the audio playback device is located is considered in the calibration process, not only the reflection environment in the direction from the loudspeaker of the audio playback device to the listening position of the listener, so that even if the listening position of the listener changes, the acoustics compensation parameter of the audio playback device does not need to be determined again. This increases the flexibility of calibration of the audio playback device, increases the efficiency of calibration, and improves the listening experience for the user.
In one embodiment, some decoration or handle is often provided for the appearance of the audio playback device, and the thickness of the device of these parts is typically 2cm or less. Moreover, these components do not affect the frequency domain transfer function of the sound signal with a wavelength 10 times lower than the thickness thereof, that is, 0.2m or less, with respect to the audio signal. Correspondingly, the frequency domain transfer function of the sound signal relative to the audio signal above 0.2m is affected. Therefore, in order to obtain a first time domain transfer function capable of accurately reflecting the characteristic parameter value of the reflection characteristic of the emission environment of the audio playback device, the part affecting the frequency domain transfer function corresponding to the first time domain transfer function may be eliminated, and based on this, the step S103 specifically includes the following steps S1031 to S1033:
and S1031, respectively obtaining the original frequency domain transfer function of the corresponding first sound signal relative to the audio signal for each microphone in the plurality of microphones.
And S1032, according to a preset cut-off frequency, performing low-pass filtering on each original frequency domain transfer function to obtain a filtered frequency domain transfer function.
Specifically, the original frequency-domain transfer function may be input to the low-pass filtering with the cutoff frequency being the preset cutoff frequency, so as to implement the low-pass filtering in S1032.
And 1033, respectively obtaining a first time domain transfer function of the corresponding first sound signal relative to the audio signal by using inverse fourier transform according to each filtered frequency domain transfer function.
Based on the above, when the original frequency domain transfer function is recorded as hk(f) The first time domain transfer function may be expressed as: h isak(n)＝ifft[hk(f)]Wherein f is less than the cut-off frequency.
It should be noted that the preset cut-off frequency is a ratio of sound velocity to the wavelength, i.e. a ratio of 340m/s to 0.2m, i.e. the cut-off frequency is 1700 Hz. And when the wavelength is greater than 0.2m, the frequency in the frequency domain transfer function is greater than 1700 Hz.
Of course, when the thicknesses of the parts provided on the appearance of the audio playback apparatus are different, the cutoff frequencies are also different. In actual use, the cutoff frequency may be determined according to the thickness of the part provided on the appearance of the audio playback apparatus.
In addition, determining an implementation manner of the original frequency domain transfer function and performing inverse fourier transform on each filtered frequency domain transfer function are operations well known to those skilled in the art, and a detailed description of the implementation manner is omitted here.
In one embodiment, a reflection surface may be considered to have no effect on an audio signal played by a speaker when the distance between the audio playback device and the reflection surface exceeds 100cm, i.e., the reflection distance exceeds 200cm, and the transmission time period of a sound signal picked up by a microphone exceeds 6 ms. Therefore, in order to enable the first time domain transfer function to accurately reflect the characteristic parameter value of the reflection environment characteristic, the part of the first time domain transfer function which has no influence on the audio signal played by the loudspeaker, namely the part of the sound signal picked up by the microphone and having the transmission time length longer than 6ms, can be disregarded. Or, the sampling value of the sampling point corresponding to the moment greater than 6ms in the sampling values of the plurality of set sampling points of each first time domain transfer function is not considered.
Further, when the audio playback apparatus is in a noise-free environment, the sound signal that is picked up by the microphone at the earliest time is the sound signal that is played by the speaker and transmitted to the microphone via the shortest straight line. The moment when the sound signal is first picked up by the microphone when the audio playback apparatus is in a noise-free environment is denoted as t. The sound signals picked up by the microphone before the time t are all external noise signals. Furthermore, in order to enable the first time domain transfer function to further accurately reflect the characteristic parameter value of the reflection environment characteristic, the external noise signal in the first time domain transfer function may be eliminated, that is, the part of the sound signal picked up by the microphone, the transmission time of which is less than t, is not considered. Or, the sampling value of the sampling point with the corresponding time less than t in the sampling values of the plurality of set sampling points of each first time domain transfer function is not considered.
Illustratively, the shortest straight-line distance between a speaker and a microphone in an audio playback device is 0.25 (i.e., the distance between the speaker and the microphone closest to the speaker in the audio playback device), and correspondingly, t is 0.25/340 ═ 0.71 ms.
Based on this, in an embodiment, before the above S103, the following S1034 and S1035 are further included:
s1034, truncating a first time domain transfer function of each first sound signal relative to the audio signal.
S1035, modifying the corresponding first time domain transfer function into the truncated first time domain transfer function.
Specifically, when executing S1034 above, first, an intercept parameter for intercepting the first time domain transfer function needs to be determined. The interception parameter may be a transmission duration of a sound signal picked up by the microphone when the reflection surface has no influence on the audio signal played by the speaker. The intercept parameter may be set to 6 ms. It should be noted that, when the clipping parameter is that the reflection surface has no influence on the audio signal played by the speaker, the transmission time length of the sound signal picked up by the microphone is, and the specific implementation manner of S1034 is to set the upper time limit of the first time domain transfer function as the clipping parameter.
Optionally, the above interception parameter may also be: the moment when the microphone first picks up the sound signal when the audio playback device is in a noise-free environment. The intercept parameter may be set to 0.71 ms. Based on this, a specific implementation manner of the above S1034 is to set the time lower limit of the first time domain transfer function as the above truncation parameter.
It should be noted that, when the clipping parameter is a time when the audio playback apparatus is in a noise-free environment and the microphone picks up the sound signal at the earliest, the clipping parameter may be determined according to a distance between the speaker and the microphone closest to the speaker in the audio playback apparatus.
It should be further noted that, after the corresponding first time domain transfer function is modified into the truncated first time domain transfer function, when the above-mentioned S104 is executed, the characteristic parameter value representing the reflection characteristic of the reflection environment where the audio playback device is located is not obtained according to the sampling values of all the set sampling points of each first time domain transfer function. But rather a characteristic parameter value representing the reflection characteristic of the reflection environment in which the audio playback device is located is obtained from the sampling value corresponding to each first time domain transfer function at the sampling point within the time range of the first time domain transfer function at the time point.
Based on the above, in another embodiment, the above S104 may include the following S1036 and S1037:
and S1036, filtering the sampling values of the plurality of first time domain transfer functions at the plurality of set sampling points according to the sampling frequencies corresponding to the plurality of set sampling points.
And S1037, obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment where the audio playback equipment is located according to the sampling value after the filtering processing.
Specifically, based on the above, it is necessary to filter out the sampling points corresponding to the time greater than 6ms and less than 0.71ms from the plurality of sampling points. If the sampling frequency corresponding to the plurality of set sampling points is 16KHz, the sampling points with the sequence of the sampling points larger than 96 need to be filtered, and the sampling points with the sequence of the sampling points smaller than 12 need to be filtered.
< example >
See fig. 2 for a schematic diagram of a first time domain transfer function when an audio playback device comprising 6 microphones is in a desktop environment. The sampling values of a plurality of set sampling points in the first time domain transfer function are brought into the reflection characteristic function, and the characteristic parameter value of 0.12 can be obtained. Referring to the second mapping diagram shown in fig. 3, when the characteristic parameter value is 0.12, the corresponding reflective environment type is a reflective environment having a reflective surface.
See fig. 4 for a schematic diagram of a first time domain transfer function when an audio playback device comprising 6 microphones is in a wall environment. And substituting the sampling values of a plurality of set sampling points in the first time domain transfer function into the reflection characteristic function to obtain a characteristic parameter value of 0.2. Referring to the second mapping diagram shown in fig. 3, when the characteristic parameter value is 0.2, the corresponding reflective environment type is a reflective environment having two reflective surfaces.
< calibration apparatus for Audio playback device >
In this embodiment, there is further provided a calibration apparatus 50 for an audio playback device, configured to implement the calibration method for an audio playback device provided in any one of the embodiments of the present application, as shown in fig. 5, the apparatus includes:
a memory 51 for storing computer instructions;
a processor 52 for calling computer instructions from the memory 51 to execute the calibration method of any one of the audio playback devices provided by the above embodiments.
In this embodiment, the calibration means 50 of the audio retransmission apparatus can be disposed inside various audio playback apparatuses (e.g., smart speakers). The apparatus may also be a variety of electronic devices including an audio playback device. Alternatively, the apparatus may also be a hardware module and/or a software module in an audio playback device or the aforementioned electronic device.
< computer storage Medium >
In the present embodiment, there is also provided a computer storage medium storing computer instructions which, when executed by a processor, implement the calibration method of any one of the audio playback devices provided in the above embodiments.
The present invention may be a system, method and/or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied therewith for causing a processor to implement various aspects of the present invention.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present invention may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present invention are implemented by personalizing an electronic circuit, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), with state information of computer-readable program instructions, which can execute the computer-readable program instructions.
Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, by software, and by a combination of software and hardware are equivalent.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.
Claims (10)
1. A calibration method of an audio playback device comprising a speaker and a plurality of microphones, wherein the calibration method comprises:
controlling the loudspeaker to play an audio signal;
acquiring a plurality of first sound signals picked up by the plurality of microphones when the audio playback device plays the audio signal;
for each microphone of the plurality of microphones, obtaining a corresponding first time-domain transfer function of the first sound signal relative to the audio signal;
obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling values of the first time domain transfer functions at a plurality of set sampling points;
determining a sound effect compensation parameter of the audio playback device according to the characteristic parameter value,
wherein, before obtaining a characteristic parameter value representing a reflection characteristic of an environment in which the audio playback apparatus is located according to a sampling value of a plurality of set sampling points of a plurality of the first time-domain transfer functions, the method further comprises:
acquiring a reflection characteristic function, wherein the reflection characteristic function represents a mapping relation between a plurality of first time domain transfer functions and the characteristic parameter value; and
the obtaining of the characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback device according to the sampling values of the first time domain transfer function at a plurality of set sampling points comprises:
and obtaining the characteristic parameter value according to the reflection characteristic function and the sampling values of the plurality of first time domain transfer functions at a plurality of set sampling points.
2. The method according to claim 1, before obtaining a characteristic parameter value representing a reflection characteristic of a reflection environment in which the audio playback apparatus is located, from sample values of a plurality of set sample points according to a plurality of the first time-domain transfer functions, further comprising:
for each microphone of the plurality of microphones, obtaining a second time-domain transfer function of the corresponding second sound signal relative to the audio signal; the second sound signal is a sound signal picked up by each microphone of the plurality of microphones when the audio playback device is playing the audio signal in a reflection-free environment; and
the obtaining of the characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback device according to the sampling values of the first time domain transfer function at the set sampling points further comprises:
and obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling values of each first time domain transfer function and each second time domain transfer function at a plurality of set sampling points.
3. The method according to claim 1, said method at the step of obtaining, for each microphone of said plurality of microphones, a corresponding first time-domain transfer function of said first sound signal with respect to said audio signal, respectively, comprising:
for each microphone of the plurality of microphones, obtaining an original frequency-domain transfer function of the corresponding first sound signal relative to the audio signal;
according to a preset cut-off frequency, performing low-pass filtering on each original frequency domain transfer function to obtain a filtered frequency domain transfer function;
and according to each filtered frequency domain transfer function, respectively obtaining a first time domain transfer function of the corresponding first sound signal relative to the audio signal by utilizing inverse Fourier transform.
4. The method according to claim 1 or 3, further comprising, before obtaining the corresponding first time-domain transfer function of the first sound signal relative to the audio signal, respectively:
intercepting a first time domain transfer function of each of the first sound signals relative to the audio signal;
and modifying the corresponding first time domain transfer function into the intercepted first time domain transfer function.
5. The method according to claim 1 or 3, wherein the step of obtaining a characteristic parameter value representing a reflection characteristic of a reflection environment in which the audio playback apparatus is located according to a plurality of sampling values of the first time-domain transfer function at a plurality of set sampling points comprises:
according to sampling frequencies corresponding to the set sampling points, filtering sampling values of the first time domain transfer functions at the set sampling points;
and obtaining a characteristic parameter value representing the reflection characteristic of the reflection environment of the audio playback equipment according to the sampling value after the filtering processing.
6. The method of claim 1, wherein determining the prominence compensation parameter for the audio playback device based on the characteristic parameter value comprises:
determining the type of the reflection environment corresponding to the characteristic parameter value according to the characteristic parameter value;
determining a sound effect compensation parameter corresponding to the reflection environment type according to the reflection environment type;
and taking the sound effect compensation parameter corresponding to the reflection environment type as the sound effect compensation parameter of the audio playback equipment.
7. The method of claim 6, wherein the reflective environment type is one of a non-reflective surface environment, a single reflective surface environment, a double reflective surface environment, a triple reflective surface environment, and other reflective surface environments.
8. The method of claim 1, further comprising:
compensating the audio signal played by a loudspeaker in the audio playback equipment according to the sound effect compensation parameter;
or outputting a compensation prompt representing whether compensation is carried out or not according to the sound effect compensation parameter, and compensating the audio signal played by a loudspeaker in the audio playback equipment according to the sound effect compensation parameter when the compensation prompt representing compensation is received.
9. Calibration apparatus for an audio playback device, comprising a memory for storing computer instructions and a processor for retrieving the computer instructions from the memory to perform the method of any one of claims 1 to 8.
10. A computer storage medium storing computer instructions which, when executed by a processor, implement the method of any one of claims 1-8.
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