CN108882115B - Loudness adjustment method and device and terminal - Google Patents
Loudness adjustment method and device and terminal Download PDFInfo
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- CN108882115B CN108882115B CN201710333279.9A CN201710333279A CN108882115B CN 108882115 B CN108882115 B CN 108882115B CN 201710333279 A CN201710333279 A CN 201710333279A CN 108882115 B CN108882115 B CN 108882115B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The application discloses a loudness adjustment method, a loudness adjustment device and a terminal, and belongs to the field of loudness adjustment. The method comprises the following steps: the terminal calculates a first average loudness of a first audio signal, wherein the first audio signal is an audio signal being played by a playing device; the terminal calculates a second average loudness of a second audio signal, wherein the second audio signal is obtained by collecting sound played by the playing device when the playing device plays the first audio signal; the terminal calculates a loudness difference value of the first average loudness and the second average loudness; the terminal determines an adjusting factor according to the loudness difference value; and the terminal adjusts the loudness of the first audio signal according to the adjusting factor. The problem of because playback devices's broadcast ability is different, need the manual volume of adjusting of user to lead to complex operation, regulation inefficiency has been solved to this application, has reached and has adjusted first audio signal according to the sound automation that playback devices broadcast to obtain the effect of suitable loudness.
Description
Technical Field
The present application relates to the field of loudness adjustment, and in particular, to a loudness adjustment method, apparatus, and terminal.
Background
The volume level played by the playing device is related to the amplitude of the audio signal and the playing capability of the playing device.
In the prior art, the volume is adjusted by using Automatic Gain Control (AGC), and the adjusting method includes: the playing device carries out certain time delay on the input audio signals, collects the amplitude of the input audio signals according to a preset sampling rate while delaying the time, calculates average input energy according to the amplitude of each collected audio signal, obtains a corresponding energy value according to a volume value set by a user, compares the average input energy with the obtained energy value, adjusts the amplitude of the input audio signals according to a comparison result, and finally outputs the adjusted audio signals.
Because the volume is not only related to the amplitude of the audio signal, but also related to the playing capability of the playing device, and different playing devices have different playing capabilities, even if the same audio signal is played, the played sound effect is different, for example, the volume is normal when the same audio signal is played on the playing device a, but the volume may be too large or too small when the same audio signal is played on the playing device B, in this case, the volume needs to be manually adjusted by the user, the operation is cumbersome, and the adjustment efficiency is low.
Disclosure of Invention
In order to solve the problems that in the prior art, due to different playing capabilities of different playing devices, even if the same audio signal is played, played sound effects are different, and therefore a user needs to manually adjust the volume, the operation is complicated, and the adjusting efficiency is low, embodiments of the present invention provide a loudness adjusting method, device, and terminal. The technical scheme is as follows:
in a first aspect, a loudness adjusting method is provided, where the method is applied to a system including a terminal, a playing device, and a sound receiving device, the terminal outputs a first audio signal, the first audio signal is an audio signal being played by the playing device, the terminal calculates a first average loudness of the first audio signal, when the playing device plays the first audio signal, the sound receiving device collects sounds played by the playing device when the playing device plays the first audio signal, to obtain a second audio signal, the terminal calculates a second average loudness of the second audio signal, after calculating a loudness difference between the first average loudness and the second average loudness, the terminal determines an adjustment factor according to the loudness difference, and adjusts the loudness of the first audio signal according to the adjustment factor.
Through when playing first audio signal at playback devices, the sound played when gathering playback devices through sound receiving equipment and playing first audio signal obtains the second audio signal, through the difference of comparison first audio signal and second audio signal, make the terminal can adjust first audio signal according to the actual sound that playback devices played, thereby including playback devices ' playing ability is considered, adjust first audio signal according to the sound effect that the people's ear actually heard, make the sound that first audio signal after the regulation played satisfy actual loudness demand through playback devices, thereby realize the automatic control to the loudness, do not need user's oneself to adjust, simplify user operation, the efficiency of adjusting is improved.
In a first possible implementation manner of the first aspect, when determining the adjustment factor according to the loudness difference, the terminal further needs to first obtain the sensitivity of the sound receiving device, and then determine the adjustment factor according to the loudness difference and the sensitivity of the sound receiving device.
Since the sensitivity of the sound receiving device is different due to the different specifications and positions of the sound receiving device, the influence of the specifications and positions of the sound receiving device on sound collection can be eliminated by taking the sensitivity of the sound receiving device as a part of the factors for determining the adjustment factor.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, when determining the adjustment factor according to the loudness difference and the sensitivity of the sound receiving device, the terminal first calculates a first adjustment coefficient according to the loudness difference, determines a second adjustment coefficient according to the sound receiving device, and then multiplies the first adjustment coefficient and the second adjustment coefficient to obtain the adjustment factor, where the sensitivity of the sound receiving device and the second adjustment coefficient have a corresponding relationship, and the larger the sensitivity of the sound receiving device is, the smaller the second adjustment coefficient is.
The first adjusting coefficient calculated according to the loudness difference value is multiplied by the second adjusting coefficient determined according to the sensitivity to obtain the adjusting factor, so that the adjusting factor is influenced by the loudness difference value and the sensitivity, the loudness difference value is calculated according to the first audio signal and the second audio signal collected by the sound receiving equipment, the actual sound effect of the sound played by the playing equipment can be reflected through the second audio signal and the sensitivity, and the adjusting factor can adjust the first audio signal more in combination with the actual playing effect.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner, when the terminal calculates the first adjustment coefficient according to the loudness difference value, the loudness difference value is divided by the first predetermined value to obtain a first value, then the second predetermined value is used as a base number, the first value is used as an index, and a second value is calculated, where the second value is the calculated second adjustment coefficient.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, or the third possible implementation manner of the first aspect, in a fourth possible implementation manner, when the terminal calculates the first average loudness of the first audio signal, the terminal performs framing processing on the first audio signal to obtain n signal frames, where n is a positive integer, and for each of the signal frames, the terminal detects whether the signal frame is an active audio signal frame containing a speech signal by Voice Activity Detection (VAD), and for each of the detected active audio signal frames, the terminal calculates frame energy of each active audio signal frame, converts the frame energy into loudness, and then calculates an average value of each loudness to obtain the first average loudness.
In addition, the loudness of the second audio signal is calculated in a manner consistent with the calculation of the loudness of the first audio signal.
Because the first audio signal and the second audio signal may not always have a voice signal, the VAD detects the active audio signal frame containing the voice signal, so as to remove the influence of the non-voice signal on the signal frame energy, thereby enabling the calculated frame energy to be more accurate.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, or the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, when calculating frame energy of an active audio signal frame and converting the frame energy into loudness, the terminal first obtains an average amplitude of the active audio signal frame, then calculates frame energy of the active audio signal frame according to the average amplitude, where the frame energy is equal to a square of the average amplitude, then calculates a first logarithm by taking frame energy as a true number, and multiplies the first logarithm by a fourth predetermined value to obtain the loudness of the active audio signal frame.
By converting the frame energy into the loudness, the terminal can convert the parameters directly obtained from the audio signal into the parameters capable of directly reflecting the sound size.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, the fourth possible implementation manner of the first aspect, or the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, when the terminal adjusts the loudness of the first audio signal according to the adjustment factor, the amplitude of the first audio signal is multiplied by the adjustment factor to obtain a target amplitude of the first audio signal, where the target amplitude, that is, the amplitude at which the loudness of sound emitted by the adjusted first audio signal through the playing device can reach the original loudness of sound expected by the first audio signal.
The amplitude of the first audio signal is multiplied by the determined adjusting factor, so that the loudness of sound played by the adjusted first audio signal through the playing device can reach the original expected loudness of sound of the first audio signal.
In a second aspect, a loudness adjustment apparatus is provided, where the loudness adjustment apparatus includes at least one unit, and each unit is respectively used to implement the corresponding step in the loudness adjustment method of the first aspect or any one of the possible implementations of the first aspect.
In a third aspect, a terminal is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the computer program is executed by the processor, the loudness adjustment method provided by the first aspect or any one of the possible implementations of the first aspect is implemented.
In a fourth aspect, a computer-readable medium is provided that stores instructions for implementing the loudness adjustment method provided in the first aspect above or any one of the possible implementations of the first aspect.
Drawings
FIG. 1 is a schematic diagram of a system provided by one embodiment of the present application;
FIG. 2 is a schematic block diagram of a system provided by an embodiment of the present application;
FIG. 3 is a schematic block diagram of a system provided in accordance with another embodiment of the present application;
FIG. 4 is a schematic block diagram of a system according to yet another embodiment of the present application;
fig. 5 is a flow chart of a method of loudness adjustment provided by an embodiment of the present application;
fig. 6 is a flow chart of a method of loudness adjustment according to another embodiment of the present application;
fig. 7 is a flow chart of a method of loudness adjustment according to yet another embodiment of the present application;
fig. 8 is a correspondence relationship between the sensitivity of the sound receiving apparatus and the second adjustment coefficient provided by an embodiment of the present application;
fig. 9 is a schematic diagram of a loudness adjustment method provided by an embodiment of the present application;
fig. 10 is a block diagram illustrating a structure of a loudness adjustment apparatus according to an embodiment of the present application;
fig. 11 is a block diagram illustrating a terminal according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a system provided by one embodiment of the present application. As shown in fig. 1, the system 100 includes a terminal 110, a playback device 120, and a sound receiving device 130.
The terminal 110 is used to calculate and condition the audio signal.
For example, in the embodiments of the present application, the terminal 110 adjusts the amplitude of the audio signal, and the larger the amplitude of the audio signal is, the larger the energy corresponding to the audio signal is, the larger the loudness corresponding to the audio signal is, and the larger the volume of the sound emitted according to the audio signal is, the loudness is equivalent to the volume. The amplitude, the energy and the loudness can be mutually converted, and if the amplitude is A, the energy is E and the loudness is V, the E is A2，V＝20lgE，V＝10lgA。
The playing device 120 is used for playing the audio signal, that is, for converting the electric energy corresponding to the audio signal into sound energy, and the sound energy drives the air to vibrate, so as to transmit the sound.
The sound receiving device 130 is configured to receive sound in a sound receiving range, generate an audio signal, that is, receive sound in the sound receiving range, and convert sound energy into electric energy to obtain the audio signal.
The terminal 110 is connected to the playing device 120, and the terminal 110 transmits the adjusted audio signal to the playing device 120 for playing; the terminal 110 is also connected to the sound receiving apparatus 130, and the terminal 110 receives the audio signal generated by the sound receiving apparatus 130 and performs calculation analysis.
Optionally, the terminal 110, the playing device 120, and the sound receiving device 130 are independent devices, the terminal 110 and the playing device 120 are connected in a wired or wireless manner, and the terminal 110 and the sound receiving device 130 are connected in a wired or wireless manner.
Referring to fig. 2 in combination, the terminal 110, the microphone 150 and the speaker 160 are separate devices, the terminal 110 is connected to the microphone 150, and the terminal 110 is connected to the speaker 160. The terminal 110 is configured to perform calculation and analysis on the audio signal collected by the microphone 150, and is further configured to send the audio signal to the sound box 160 for playing. The enclosure 160 includes two separate enclosure devices, corresponding to the left and right channels, respectively. The microphone 150 is the sound receiving device 130 in fig. 1, and the speaker 160 is the playing device 120 in fig. 1.
Optionally, any two of the terminal 110, the playing device 120 and the sound receiving device 130 are integrated on the same device.
It is assumed that the terminal 110 and the sound receiving device 130 are integrated on the same device, that is, the sound receiving device 130 is a part of the terminal 110, the playing device 120 is a separate device, and the terminal 110 and the playing device 120 are connected in a wired or wireless manner.
Referring to fig. 3 in combination, the terminal 110 and the microphone 150 are integrated in the same device, the speaker 160 is a separate device, and the terminal 110 is connected to the speaker 160. The terminal 110 is configured to perform calculation and analysis on the audio signal collected by the microphone 150, and is further configured to send the audio signal to the sound box 160 for playing. The microphone 150 is disposed inside the terminal 110, and a small hole is formed in the housing of the terminal 110 at a position corresponding to the microphone 150, through which external sound is transmitted to the microphone 150. The microphone 150 is the sound receiving device 130 in fig. 1, and the speaker 160 is the playing device 120 in fig. 1.
Optionally, the terminal 110, the playing device 120, and the sound receiving device 130 are integrated on the same device, that is, the playing device 120 is a part of the terminal 110, and the sound receiving device 130 is a part of the terminal 110.
Referring to fig. 4 in combination, the terminal 110, the microphone 150, and the sound box 160 are integrated on the same device, and the terminal 110 is configured to perform calculation analysis on the audio signal collected by the microphone 150 and further configured to send the audio signal to the sound box 160 for playing. The speaker box 160 is a speaker inside the terminal 110, a small hole is provided on the housing of the terminal 110 at a position corresponding to the speaker box 160 (speaker), and the speaker box 160 (speaker) transmits sound through the small hole. The microphone 150 is disposed inside the terminal 110, and a small hole is formed in the housing of the terminal 110 at a position corresponding to the microphone 150, through which external sound is transmitted to the microphone 150. The microphone 150 is the sound receiving device 130 in fig. 1, and the speaker 160 is the playing device 120 in fig. 1.
Optionally, the system is a conference system. The terminal 110, the playing device 120 and the sound receiving device 130 in the conference system are independent devices; or, the sound receiving device 130 is integrated on the terminal 110 in the conference system, and the playing device 120 is an independent device; or, the terminal 110 in the conference system is integrated with the playing device 120, and the sound receiving device 130 is an independent device; or, the terminal 110 in the conference system is an independent device, and the playing device 120 and the sound receiving device 130 are integrated into the same audio device; alternatively, the terminal 110 in the conference system is integrated with the playback device 120 and the sound receiving device 130.
In practical applications, the terminal 110 may also be a mobile phone, a computer, a tablet computer, or the like, and if the terminal 110 is a mobile phone, a computer, a tablet computer, or the like, the terminal 110 is integrated with the playing device 120 and the sound receiving device 130, where the playing device 120 is a speaker on the terminal 110, and the sound receiving device 130 is a microphone on the terminal 110.
Optionally, when the playing device 120 is an independent device, the playing device 120 is a sound box.
Alternatively, when the sound receiving apparatus 130 is a stand-alone apparatus, the sound receiving apparatus 130 is a microphone.
Optionally, the sound receiving device 130 is an omnidirectional microphone, and the omnidirectional microphone is used for collecting sounds in various directions.
Fig. 5 is a flowchart of a method of loudness adjustment, which is illustrated in the system 100 shown in fig. 1 and provided by an embodiment of the present application, and as shown in fig. 5, the method of loudness adjustment may include:
the terminal calculates a first average loudness of a first audio signal, which is an audio signal being played by the playing device.
The first average loudness is capable of reflecting a loudness level of the first audio signal.
202, the terminal calculates a second average loudness of a second audio signal, where the second audio signal is obtained by collecting, by a sound receiving device, a sound played by a playing device when the playing device plays the first audio signal.
The first audio signal is played out sound through the playing equipment, the sound is spread in the air, the sound receiving equipment collects the sound in the sound receiving range, and the collected sound is converted into a second audio signal. Due to the different playing capabilities of the playing devices themselves, the loudness of the actual sound played out may differ from the loudness of the first audio signal.
And the terminal calculates the second average loudness of the second audio signal, namely the loudness of the actual sound played by the playing equipment.
And 203, the terminal calculates the loudness difference value of the first average loudness and the second average loudness.
By calculating the loudness difference between the first average loudness and the second average loudness, the difference between the loudness of the sound emitted by the first audio signal after being played by the playing device and the loudness of the sound which the first audio signal should reach can be determined, so that the playing capability of the playing device can be determined.
And 204, the terminal determines an adjusting factor according to the loudness difference value.
Determining the adjustment factor according to the loudness difference may enable the terminal to adjust the first audio signal according to the playing capability of the playing device.
The adjustment factor is a parameter for adjusting the first audio signal.
The terminal adjusts the loudness of the first audio signal according to the adjustment factor 205.
The terminal adjusts the loudness of the first audio signal according to the adjusting factor, so that the loudness of the sound played by the adjusted first audio signal through the playing device can accord with the loudness that the original first audio signal can reach.
The first audio signal after adjustment can cancel the influence of the playing capability of the playing device by taking the playing capability of the playing device into consideration.
To sum up, the loudness adjusting method provided by the embodiment of the application obtains the second audio signal by collecting the sound played when the playing device plays the first audio signal through the sound receiving device when the playing device plays the first audio signal, and adjusts the first audio signal according to the actual sound played by the playing device by comparing the difference between the first audio signal and the second audio signal, so that the terminal can adjust the first audio signal according to the actual sound played by the playing device, thereby taking the playing capability of the playing device into consideration, adjust the first audio signal according to the actual sound effect heard by human ears, and make the adjusted sound played by the first audio signal through the playing device meet the actual loudness requirement, thereby realizing automatic control of loudness, not requiring the user to adjust himself, simplifying user operation, and improving adjusting efficiency.
Fig. 6 is a flowchart of a method of loudness adjustment, which is illustrated in the system 100 shown in fig. 1 and provided by another embodiment of the present application, and as shown in fig. 6, the method of loudness adjustment may include:
301, the terminal adjusts the input audio signal through AGC to obtain a first audio signal.
The terminal adjusts the audio signal input into the terminal through the AGC, namely, the amplitude of the input source audio signal is adjusted according to the volume value (loudness value) set by the user, so that the situation that the loudness of the input source audio signal is too large or too small can be avoided.
The terminal calculates 302a first average loudness of the first audio signal.
The first average loudness can reflect the loudness level of the first audio signal after being adjusted by the AGC.
Alternatively, step 302 may be replaced with the step shown in FIG. 7:
302a, the terminal performs framing processing on the first audio signal to obtain n signal frames, where n is a positive integer.
Such as: a segment of the first audio signal having a duration of 5 seconds is divided in the time domain into 625 signal frames having a duration of 8 milliseconds.
302b, for each signal frame, the terminal detects whether the signal frame is an active audio signal frame by voice activity detection, VAD.
The active audio signal frames are signal frames in which a speech signal is present.
Since human speech is not continuous and there may be intervals, the audio signal may not be continuously voiced, and the middle portion may include a segment without voice, and if the segment without voice is not excluded, the calculated average loudness may not accurately reflect the loudness level of the entire audio signal, so that it is necessary to detect the active audio signal frames including the voice signal through VAD.
302c, the terminal calculates the frame energy of the active audio signal frame and converts the frame energy to loudness.
Loudness represents the degree of the energy of frames in an audio signal.
Energy and loudness can be converted, and the conversion mode can be realized by the following steps:
s1, the terminal obtains the average amplitude of the active audio signal frames.
s2, the terminal squares the average amplitude to obtain the frame energy of the active audio signal frame.
s3, the terminal calculates the first logarithm based on the third predetermined value and the frame energy as the true number.
s4, the terminal multiplies the first logarithm by a fourth predetermined value to obtain the loudness of the active audio signal frame.
Steps s1 to s4 may be described by formula (1):
V＝20lgA2formula (1)
Where V denotes loudness, A denotes average amplitude2Representing the frame energy, the third predetermined value is 10 and the fourth predetermined value is 20.
Optionally, in a possible implementation manner, for each active audio signal frame, the amplitude of each sampling point is obtained according to a predetermined sampling rate, for example, for an active audio signal frame with a duration of 8 milliseconds, the amplitude of each sampling point is determined according to a sampling rate of every 1 millisecond, the amplitude of each sampling point is converted into loudness, then the loudness sum of all sampling points is calculated, and the loudness sum of all sampling points is used as the loudness of the active audio signal frame.
302d, the terminal calculates the average value of each loudness obtained by conversion to obtain the first average loudness.
The loudness level of the first audio signal is determined by calculating an average of the loudness of each active audio signal frame.
303, the terminal sends the first audio signal to the playing device.
And the terminal sends the first audio signal after AGC adjustment to a playing device for playing.
304, the playing device plays the first audio signal.
After the playing equipment receives the first audio signal, the electric energy corresponding to the first audio signal is converted into sound energy, the sound energy generated by the playing equipment drives the air to vibrate, and the sound generated by the first audio signal through the playing equipment is transmitted out through the air.
305, the sound receiving device collects the sound played by the playing device when playing the first audio signal, and obtains a second audio signal.
The first audio signal is played out sound through the playing equipment, the sound is spread in the air, the sound receiving equipment collects the sound in the sound receiving range, and the collected sound is converted into a second audio signal. Due to the playing capability of the playing device itself, the loudness of the actual sound played out may differ from the loudness of the first audio signal.
And 306, the sound receiving equipment sends the collected second audio signal to the terminal.
307, the terminal calculates a second average loudness of the second audio signal.
The second average loudness is calculated in the same way as the first average loudness.
The second average loudness is used to reflect the loudness level of the actual sound played by the playback device.
308, the terminal calculates a loudness difference between the first average loudness and the second average loudness.
By calculating the loudness difference between the first average loudness and the second average loudness, the difference between the loudness of the sound emitted by the first audio signal after being played by the playing device and the loudness of the sound which the first audio signal should reach can be determined, so that the playing capability of the playing device can be determined.
309, the terminal acquires the sensitivity of the sound receiving apparatus.
The sound receiving devices have different specifications and different placement positions, which may cause different sensitivities of the microphones for sound collection, and therefore, the terminal needs to acquire the sensitivity of the sound receiving device.
Optionally, the terminal obtains a sensitivity of the sound receiving device stored in advance. When the terminal leaves the factory, the terminal may store the sensitivity of the sound receiving device of the specification in advance, or, assuming that the terminal, the playing device, and the sound receiving device in the system are independent devices, when the system is installed, an installer tests the sensitivity of the sound receiving device according to the position set by the sound receiving device, and stores the sensitivity of the sound receiving device in the terminal.
Optionally, the terminal may collect the sensitivity of the sound receiving device by itself. Such as: the sensitivity of a microphone is typically measured at a sound pressure level of 94 db, or at a pressure of 1 pa, using a 1kHz sine wave, with the sine wave as an input, and the amplitude of the analog or digital signal output by the microphone is used as a measure of the sensitivity of the microphone. The unit of sensitivity determined by the above method is dBV (decibels with respect to 1V), which represents the number of volts of the output signal at a given sound pressure level.
Optionally, the sound receiving device is an omnidirectional microphone, and the omnidirectional microphone can prevent the sound emitted by the playing device from being out of the sound collection range of the microphone.
Optionally, in a possible scenario, the system is a conference system, in a conference room, the terminal, the playing device, and the sound receiving device of the conference system are independently arranged, and when adjusting, the sound receiving device may be placed at a position of ears of a listener, so that a listening experience of a human can be simulated, and the terminal adjusts the first audio signal according to a loudness of sound heard at the ears of the human.
The terminal determines an adjustment factor based on the loudness difference and the sensitivity of the sound receiving device 310.
The adjusting factor is determined according to the loudness difference value and the sensitivity of the sound receiving device, so that the terminal can adjust the first audio signal according to the playing capability of the playing device and the sensitivity of the sound receiving device for collecting sound.
Optionally, step 310 may be replaced by the steps shown in FIG. 7:
and 310a, the terminal calculates a first adjusting coefficient according to the loudness difference value.
Optionally, the calculation of the first adjustment coefficient may be implemented by:
s1, the terminal divides the loudness difference by the first predetermined value to obtain a first value.
And S2, calculating to obtain a second value by taking the second preset value as a base number and the first value as an index number.
S3, the terminal determines the second value as the first adjustment factor.
Steps S1 to S3 may be described by formula (2):
wherein α denotes a first adjustment factor, V1Representing a first average loudness, V2Representing a second average loudness, V2-V1The first predetermined value is 20 and the second predetermined value is 10, representing the loudness difference.
And 310b, the terminal determines a second adjusting coefficient according to the sensitivity of the sound receiving equipment.
Wherein the second adjustment coefficient is smaller when the sensitivity of the sound receiving apparatus is larger, or the second adjustment coefficient is larger when the sensitivity of the sound receiving apparatus is smaller, that is, the sensitivity of the sound receiving apparatus is negatively correlated with the second adjustment coefficient.
Referring to fig. 8 in combination, fig. 8 exemplarily shows the correspondence between the sensitivity of the sound receiving apparatus and the second adjustment coefficient β, for example, the sensitivity S1Corresponding to the second adjustment coefficient β1Sensitivity S2Corresponding to the second adjustment coefficient β2Sensitivity S3Corresponding to the second adjustment coefficient β3Sensitivity S4Corresponding to the second adjustment coefficient β4Sensitivity SnCorresponding to the second adjustment coefficient βn。
And 310c, the terminal multiplies the first adjusting coefficient by the second adjusting coefficient to obtain an adjusting factor.
The first adjusting coefficient calculated according to the loudness difference value is multiplied by the second adjusting coefficient determined according to the sensitivity to obtain the adjusting factor, so that the adjusting factor is influenced by the loudness difference value and the sensitivity.
The calculation of the adjustment factor can be described by equation (3):
gamma-alpha x-beta formula (3)
Where γ denotes an adjustment factor, α denotes a first adjustment coefficient, and β denotes a second adjustment coefficient.
And 311, the terminal multiplies the amplitude of the first audio signal by the adjusting factor to obtain a target amplitude of the first audio signal.
The terminal adjusts the loudness of the first audio signal according to the adjusting factor, so that the loudness of the sound played by the adjusted first audio signal through the playing device can meet the loudness expected to be achieved by the original first audio signal.
The playing capability of the playing device is taken into consideration, so that the influence of the playing device can be offset by the adjusted first audio signal.
In practical applications, the loudness level of the first audio signal adjusted by the AGC is satisfactory, but the playing capability of the playing device may be limited, for example: the loudness of the first audio signal is appropriate, but the loudness of the sound played by the playing device is small, and usually, a user can manually adjust a loudness adjusting device (volume adjusting device) on the playing device, but even if the loudness adjusting device on the playing device is manually adjusted to the maximum value, the loudness of the sound played by the playing device is still small, and at the moment, by adjusting the first audio signal, the loudness of the first audio signal is adjusted to be large, so that the problem of insufficient playing capacity of the playing device can be solved.
And 312, the terminal sends the adjusted first audio signal to the playing device.
313, the playing device plays the adjusted first audio signal.
The adjusted first audio signal passes through the playing device, and the playing device can play sound with proper loudness.
The loudness adjustment method described in this embodiment can also be illustrated by the schematic diagram in fig. 9. The audio signal 401 is input into the terminal 110, the terminal 110 adjusts the audio signal 401 to obtain a first audio signal 402, the terminal 110 sends the first audio signal 402 to the playing device 120, the playing device 120 plays the sound 403, the sound 403 propagates through the air 404, the sound receiving device 130 collects the sound 405 from the air 404, the sound receiving device 130 converts the sound 405 into a second audio signal 406, and then sends the second audio signal 406 to the terminal 110, and the terminal 110 analyzes the difference between the first audio signal 402 and the second audio signal 406 to adjust the first audio signal 402.
To sum up, the loudness adjusting method provided by the embodiment of the application obtains the second audio signal by collecting the sound played when the playing device plays the first audio signal through the sound receiving device when the playing device plays the first audio signal, and adjusts the first audio signal according to the actual sound played by the playing device by comparing the difference between the first audio signal and the second audio signal, so that the terminal can adjust the first audio signal according to the actual sound played by the playing device, thereby taking the playing capability of the playing device into consideration, adjust the first audio signal according to the actual sound effect heard by human ears, and make the adjusted sound played by the first audio signal through the playing device meet the actual loudness requirement, thereby realizing automatic control of loudness, not requiring the user to adjust himself, simplifying user operation, and improving adjusting efficiency.
Regarding steps 309 to 310, since the sensitivity of the sound receiving apparatus varies due to the difference in the specification and the position of the sound receiving apparatus, the influence of the specification and the position of the sound receiving apparatus on sound collection can be excluded by using the sensitivity of the sound receiving apparatus as a part of the factor for determining the adjustment factor.
Aiming at the steps 310a to 310c, a first adjusting coefficient calculated according to a loudness difference value is multiplied by a second adjusting coefficient determined according to sensitivity to obtain an adjusting factor, so that the adjusting factor is influenced by the loudness difference value and the sensitivity, the loudness difference value is calculated according to a first audio signal and a second audio signal collected by a sound receiving device, and the actual sound effect of sound played by a playing device can be reflected through the second audio signal and the sensitivity, so that the adjusting factor can adjust the first audio signal more in combination with the actual playing effect.
For steps 302a to 302d, since there may not always be a speech signal in the first audio signal and the second audio signal, the VAD is used to detect the active audio signal frame containing the speech signal, so as to remove the influence of the non-speech signal on the signal frame energy, thereby making the calculated frame energy more accurate.
In addition, by converting the frame energy into loudness, the terminal can convert the frame energy into parameters capable of directly reflecting the sound size according to the parameters directly acquired from the audio signal.
For steps 311 to 313, the amplitude of the first audio signal is multiplied by the determined adjustment factor, so that the loudness of sound played by the adjusted first audio signal through the playing device can reach the loudness of sound expected by the original first audio signal.
Fig. 10 is a block diagram of a loudness adjustment apparatus provided in an embodiment of the present application, which is illustrated in the terminal 110 shown in fig. 1, and which may be implemented as part or all of the terminal 110 through software, hardware, or a combination of the two. The loudness adjustment apparatus may include: a first calculation unit 510, a second calculation unit 520, a third calculation unit 530, a determination unit 540, and an adjustment unit 550.
A first computing unit 510, configured to implement the above-mentioned step 201, step 301, step 302a, step 302b, step 302c, step 302d, step s1, step s2, step s3, step s4, and any other implicit or public computing-related functions.
A second computing unit 520, configured to implement the above-mentioned step 202, step 305, step 307, and any other implicit or disclosed computing-related functions.
A third calculating unit 530 for implementing the above-mentioned steps 203, 308 and any other implicit or disclosed calculation-related functions.
A determination unit 540, configured to implement the above-mentioned steps 204, 309, 310a, 310b, 310c, S1, S2, S3, and any other implicit or disclosed functions related to determination.
An adjusting unit 550, configured to implement the above step 205, step 311, and any other implicit or disclosed adjusting related functions.
To sum up, the loudness adjusting device that this application embodiment provided, through when playback devices broadcast first audio signal, the sound played when gathering playback devices through sound receiving equipment and broadcasting first audio signal obtains the second audio signal, through the difference of comparison first audio signal and second audio signal, make the terminal can adjust first audio signal according to the actual sound that playback devices broadcast, thereby including playback devices ' broadcast ability, adjust first audio signal according to the sound effect that people's ear actually heard, make the sound that first audio signal after the regulation played satisfy actual loudness demand through playback devices, thereby realize the automatic control to the loudness, do not need user's oneself to adjust, simplify user operation, the efficiency of adjusting is improved.
In addition, since the sensitivity of the sound receiving apparatus varies due to the variation in the specification and position of the sound receiving apparatus, the influence of the specification and position of the sound receiving apparatus on sound collection can be eliminated by using the sensitivity of the sound receiving apparatus as a part of the factor for determining the adjustment factor.
In addition, the first adjusting coefficient calculated according to the loudness difference value is multiplied by the second adjusting coefficient determined according to the sensitivity to obtain the adjusting factor, so that the adjusting factor is influenced by the loudness difference value and the sensitivity, the loudness difference value is calculated according to the first audio signal and the second audio signal collected by the sound receiving equipment, the actual sound effect of the sound played by the playing equipment can be reflected through the second audio signal and the sensitivity, and the adjusting factor can adjust the first audio signal in combination with the actual playing effect.
In addition, because the first audio signal and the second audio signal may not always have voice signals, the VAD detects the active audio signal frame containing the voice signals, so that the influence of non-voice signals on the signal frame energy can be removed, and the calculated frame energy is more accurate.
In addition, by converting the frame energy into loudness, the terminal can convert the frame energy into parameters capable of directly reflecting the sound size according to the parameters directly acquired from the audio signal.
In addition, the amplitude of the first audio signal is multiplied by the determined adjusting factor, so that the loudness of sound played by the adjusted first audio signal through the playing device can reach the expected loudness of sound of the original first audio signal.
It should be noted that: when the loudness adjusting device provided in the above embodiment adjusts loudness, only the division of the above functional modules is used for illustration, in practical applications, the above function allocation may be completed by different functional modules according to needs, that is, the internal structure of the terminal is divided into different functional modules, so as to complete all or part of the above described functions. In addition, the loudness adjustment device and the loudness adjustment method provided by the above embodiments belong to the same concept, and the specific implementation process thereof is described in the method embodiments in detail, which is not described herein again.
Fig. 11 is a block diagram of a terminal according to an embodiment of the present application, where a playing device and a sound receiving device are integrated on the terminal in this embodiment. In the embodiment of the application, the terminal may be an electronic device with audio acquisition, audio signal processing and audio playing functions, such as a mobile phone, a tablet computer, a laptop portable computer, a desktop computer, a bluetooth sound box, a recording pen, and a wearable device.
As shown in fig. 11, terminal 600 may include one or more of the following components: a processor 610, a memory 620, a playback device 630, a sound receiving device 640, and a bus 650.
The processor 610 includes one or more processing cores, the memory 620 is coupled to the processor 610 by a bus 650, the memory 620 is used to store computer program instructions and data, and the steps of the loudness adjustment method in the method embodiments shown in fig. 5, 6 and 7 are implemented when the processor 610 executes the computer program instructions in the memory 620.
The playing device 630 is connected to the processor 610 and the memory 620 via the bus 650. The playing device 630 is used to play audio signals. Optionally, the playing device 630 is composed of at least one speaker or loudspeaker, and each speaker or loudspeaker is used for playing the mono audio signal.
The sound receiving device 640 is connected to the processor 610 and the memory 620 via the bus 650, respectively. The sound receiving apparatus 640 serves to collect an audio signal. Optionally, the sound receiving device 640 is composed of at least one microphone, each microphone for picking up a mono audio signal.
Optionally, the playing device 630 and the sound receiving device 640 are two separate components.
Optionally, the playing device 630 and the sound receiving device 640 are integrated into the same audio component. The audio component comprises an audio circuit, a loudspeaker and a microphone. On one hand, the audio component can transmit the electrical signal converted from the received audio signal to a loudspeaker, and the electrical signal is converted into a sound signal by the loudspeaker to be output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit and converted into an audio signal, and then the audio signal is output to the processor 610 for processing, or the audio signal is output to the memory 620 for further processing.
In addition, the Memory 620 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as a Static Random Access Memory (SRAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), an Erasable Programmable Read-Only Memory (EPROM), a Programmable Read-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic Memory, a flash Memory, a magnetic disk, or an optical disk.
The above structural illustration is only an illustrative illustration of the terminal 600, and the terminal 600 may include more or fewer components, for example, the terminal 600 may not include a transmitter, or the terminal 600 further includes other components such as a sensor, a display screen, and a power supply, and details of this embodiment are not repeated.
In other possible embodiments, the playing device 630 and the sound receiving device 640 may be devices external to the terminal 600.
Embodiments of the present application also provide a computer readable medium having stored thereon computer program instructions, which when executed by the processor 610, implement the steps of the loudness adjustment method in the method embodiments shown in fig. 5, 6 and 7.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (12)
1. A method of loudness adjustment, the method comprising:
the terminal calculates a first average loudness of a first audio signal, wherein the first audio signal is an audio signal being played by a playing device;
the terminal calculates a second average loudness of a second audio signal, wherein the second audio signal is obtained by collecting sound played by the playing device when the playing device plays the first audio signal through a sound receiving device;
the terminal calculates a loudness difference value of the first average loudness and the second average loudness;
the terminal acquires the sensitivity of the sound receiving equipment;
the terminal calculates a first adjusting coefficient according to the loudness difference value;
the terminal determines a second adjusting coefficient according to the sensitivity of the sound receiving equipment;
the terminal obtains an adjusting factor according to the first adjusting coefficient and the second adjusting coefficient;
and the terminal adjusts the loudness of the first audio signal according to the adjusting factor.
2. The method of claim 1, wherein the terminal calculates a first adjustment factor based on the loudness difference, comprising:
the terminal divides the loudness difference value by a first preset value to obtain a first numerical value;
the terminal takes a second preset value as a base number and the first numerical value as an index, and a second numerical value is obtained through calculation;
and the terminal determines the second numerical value as the first adjusting coefficient.
3. The method of claim 1, wherein the terminal calculating a first average loudness of the first audio signal comprises:
the terminal performs framing processing on the first audio signal to obtain n signal frames, wherein n is a positive integer;
for each signal frame, the terminal detects whether the signal frame is an active audio signal frame through voice activity detection VAD, wherein the active audio signal frame is a signal frame with a voice signal;
the terminal calculates the frame energy of the active audio signal frame and converts the frame energy into loudness;
and the terminal calculates the average value of the loudness obtained by conversion to obtain a first average loudness.
4. The method of claim 3, wherein the terminal calculates a frame energy of the active audio signal frame, converts the frame energy to a loudness, comprising:
the terminal acquires the average amplitude of the active audio signal frame;
the terminal calculates the square of the average amplitude to obtain the frame energy of the active audio signal frame;
the terminal calculates to obtain a first logarithm by taking a third preset value as a base number and the frame energy as a true number;
and the terminal multiplies the first logarithm by a fourth preset value to obtain the loudness of the active audio signal frame.
5. The method according to any one of claims 1 to 4, wherein the terminal adjusting the loudness of the first audio signal according to the adjustment factor comprises:
and the terminal multiplies the amplitude of the first audio signal by the adjusting factor to obtain a target amplitude of the first audio signal.
6. A loudness adjustment apparatus, characterized in that the apparatus comprises:
a first calculating unit, configured to calculate a first average loudness of a first audio signal, where the first audio signal is an audio signal being played by a playing device;
the second calculating unit is used for calculating a second average loudness of a second audio signal, wherein the second audio signal is obtained by collecting sound played by the playing device when the playing device plays the first audio signal;
a third calculation unit configured to calculate a loudness difference between the first average loudness calculated by the first calculation unit and the second average loudness calculated by the second calculation unit;
a determination unit configured to acquire a sensitivity of the sound receiving apparatus; calculating a first adjusting coefficient according to the loudness difference calculated by the third calculating unit, and determining a second adjusting coefficient according to the sensitivity of the sound receiving equipment; obtaining an adjusting factor according to the first adjusting coefficient and the second adjusting coefficient;
and the adjusting unit is used for adjusting the loudness of the first audio signal according to the adjusting factor determined by the determining unit.
7. The apparatus of claim 6, wherein the determining unit is further configured to:
dividing the loudness difference value by a first preset value to obtain a first numerical value;
calculating to obtain a second numerical value by taking a second preset value as a base number and the first numerical value as an index;
determining the second value as the first adjustment factor.
8. The apparatus of claim 6, wherein the first computing unit is further configured to:
performing framing processing on the first audio signal to obtain n signal frames, wherein n is a positive integer;
for each signal frame, detecting whether the signal frame is an active audio signal frame through Voice Activity Detection (VAD), wherein the active audio signal frame is a signal frame with a voice signal;
calculating the frame energy of the active audio signal frame, and converting the frame energy into loudness;
and calculating the average value of the loudness obtained by conversion to obtain a first average loudness.
9. The apparatus of claim 8, wherein the first computing unit is further configured to:
obtaining an average amplitude of the active audio signal frame;
calculating the square of the average amplitude to obtain the frame energy of the active audio signal frame;
calculating to obtain a first logarithm by taking a third preset value as a base number and the frame energy as a true number;
and multiplying the first logarithm by a fourth preset value to obtain the loudness of the active audio signal frame.
10. The apparatus according to any one of claims 6 to 9, wherein the adjusting unit is further configured to:
and multiplying the amplitude of the first audio signal by the adjusting factor to obtain a target amplitude of the first audio signal.
11. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program performs the steps of:
calculating a first average loudness of a first audio signal, wherein the first audio signal is an audio signal being played by a playing device;
calculating a second average loudness of a second audio signal, wherein the second audio signal is obtained by collecting sound played by the playing device when the playing device plays the first audio signal by a sound receiving device;
calculating a loudness difference of the first average loudness and the second average loudness;
acquiring the sensitivity of the sound receiving equipment;
calculating a first adjusting coefficient according to the loudness difference value;
determining a second adjustment coefficient according to the sensitivity of the sound receiving device;
obtaining an adjusting factor according to the first adjusting coefficient and the second adjusting coefficient;
adjusting the loudness of the first audio signal according to the adjustment factor.
12. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of:
calculating a first average loudness of a first audio signal, wherein the first audio signal is an audio signal being played by a playing device;
calculating a second average loudness of a second audio signal, wherein the second audio signal is obtained by collecting sound played by the playing device when the playing device plays the first audio signal by a sound receiving device;
calculating a loudness difference of the first average loudness and the second average loudness;
acquiring the sensitivity of the sound receiving equipment;
calculating a first adjusting coefficient according to the loudness difference value;
determining a second adjustment coefficient according to the sensitivity of the sound receiving device;
obtaining an adjusting factor according to the first adjusting coefficient and the second adjusting coefficient;
adjusting the loudness of the first audio signal according to the adjustment factor.
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| CN110457002B (en) * | 2019-07-03 | 2023-07-25 | 平安科技（深圳）有限公司 | Multimedia file processing method, device and computer storage medium |
| CN111048063A (en) * | 2019-12-13 | 2020-04-21 | 集奥聚合(北京)人工智能科技有限公司 | Audio synthesis method and device |
| CN113096694B (en) * | 2019-12-23 | 2023-02-21 | 北京声智科技有限公司 | Electronic terminal and play quality detection method thereof |
| CN111508520A (en) * | 2020-04-01 | 2020-08-07 | 成都德芯数字科技股份有限公司 | Audio gain control method and device, broadcasting terminal and storage medium |
| CN114615599A (en) * | 2022-03-11 | 2022-06-10 | 游密科技(深圳)有限公司 | Audio processing method, apparatus, computer device, storage medium, and program product |
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