CN117354676A - Sound superposition amplifying method based on long distance - Google Patents
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Abstract
The invention relates to the technical field of sound processing, in particular to a sound superposition amplifying method based on long distance, which comprises the following steps of S1, respectively converting acoustic signals into audio signals; s2, performing Fourier transform to obtain a plurality of audio frequency spectrums; s3, dividing an audio frequency spectrum, and filtering the high-frequency audio frequency spectrum to form a specific audio frequency spectrum; s4, amplifying the amplitude values of the low-frequency audio frequency spectrum and the medium-frequency audio frequency spectrum; s5, performing inverse Fourier transform to obtain a preprocessed audio signal; s6, signal superposition is carried out, power amplification is carried out, and then the signals are transmitted to a loudspeaker array unit; and S7, the central control module detects the corresponding sound information and adjusts the corresponding parameters to the corresponding values, so that the sound amplification effect is ensured and the sound amplification quality is ensured.
Description
Technical Field
The invention relates to the technical field of sound processing, in particular to a sound superposition amplifying method based on long distance.
Background
Sound amplification in a sound system generally refers to amplifying a weak electrical signal from a signal source to drive a speaker to emit sound, and generating a current large enough to push the speaker to play back the sound after amplifying the weak signal input by a sound source device, so that the sound is effectively transmitted. The current sound power amplification method of balanced amplification mainly carries out sound amplification by converting received sound source signals through an equalizer and then inputting the converted sound source signals into a power amplifier.
Chinese patent publication No.: CN115866487a discloses an acoustic power amplification method based on balanced amplification, comprising: acquiring an original sound source signal, performing sound source signal preprocessing on the original sound source signal to obtain a target sound source signal, and performing signal amplification on the target sound source signal to obtain an amplified sound source signal; respectively searching a low-frequency signal and a high-frequency signal in the amplified sound source signal, carrying out emphasis processing on the low-frequency signal to obtain an enhanced sound source signal, and carrying out weight reduction processing on the high-frequency signal to obtain an enhanced sound source signal; the method comprises the steps of carrying out sound source unification on an emphasis-added sound source signal and a stress-reduced sound source signal to obtain an equalization sound source signal, carrying out tone correction on the equalization sound source signal to obtain a tone correction sound source signal, and carrying out sound channel balance on the tone correction sound source signal to obtain a sound channel balance sound source signal; electroacoustic conversion is carried out on the sound channel balance sound source signals to obtain electroacoustic signals, and the electroacoustic signals are played. It can be seen that the low-frequency signal and the high-frequency signal in the amplified sound source signal are not detected and adjusted in a targeted manner, so that the sound quality cannot be optimized in a targeted manner.
Disclosure of Invention
Therefore, the invention provides a long-distance-based sound superposition amplification method which can be used for carrying out targeted detection and adjustment on sound signals, so that the sound amplification effect is ensured and the sound amplification quality is ensured.
To achieve the above object, the present invention provides a method comprising:
step S1, respectively converting a plurality of input acoustic signals into corresponding audio signals;
s2, carrying out Fourier transform on the single audio signal to obtain a plurality of audio frequency spectrums;
s3, dividing the audio frequency spectrums into a low-frequency audio frequency spectrum, a medium-frequency audio frequency spectrum and a high-frequency audio frequency spectrum, and filtering the high-frequency audio frequency spectrum to form a specific audio frequency spectrum;
step S4, respectively amplifying the amplitudes of the low-frequency audio frequency spectrum and the medium-frequency audio frequency spectrum in the specific audio frequency spectrum to corresponding values;
s5, performing inverse Fourier transform on the adjusted specific audio frequency spectrum to obtain a preprocessed audio signal;
s6, superposing a plurality of preprocessing audio signals, amplifying the power of the superposed audio signals, and then transmitting the amplified power to a loudspeaker array unit;
and S7, the central control module controls the detection module to detect the regulation mode of the power amplification of the audio signal when the loudness of the sound played by the loudspeaker array unit does not meet the preset standard, determines the judgment of the filtering range of the high-frequency audio frequency spectrum according to the sound quality evaluation value or determines the judgment mode of the amplitude amplification of the specific audio frequency spectrum according to the signal-to-noise ratio, and regulates the corresponding parameter to the corresponding value according to the judgment.
Further, in the step S3, the audio spectrum comparison manner of the central control module is determined by the frequency of the corresponding audio spectrum, where if the frequency of the audio spectrum is smaller than a first preset frequency, it is determined that the audio spectrum belongs to a low-frequency audio spectrum; if the frequency of the audio frequency spectrum is larger than or equal to the first preset frequency and smaller than the second preset frequency, judging that the audio frequency spectrum belongs to an intermediate frequency audio frequency spectrum; and if the frequency of the audio frequency spectrum is greater than or equal to the second preset frequency, judging that the audio frequency spectrum belongs to a high-frequency audio frequency spectrum.
Further, in the step S7, when the central control module determines the determination mode of power amplification of the audio signal after superposition in the step S6 according to the loudness of the sound played by the speaker array unit, the central control module determines the adjustment mode of power amplification of the audio signal after superposition according to the difference between the preset loudness set in the central control module and the loudness of the sound played by the speaker array unit measured by the detection module, or determines the determination mode of power amplification of the preprocessed audio signal according to the sound quality evaluation value C.
Further, the central control module sets the sound quality evaluationWherein k (j, α) is an amplitude value at a j-th frequency point of the α -th detection of the sound, i=0, 1,2..α, α is a total frame number of the sound fragment; if the preprocessed audio signal does not meet the preset standard, the second preset frequency corresponding to the high-frequency audio spectrum in the step S3 is reduced to a corresponding value according to the difference between the first preset sound quality evaluation value and the sound quality evaluation value, or a control detection module detects the signal-to-noise ratio of the preprocessed audio signal and determines a determination mode for amplifying the amplitude of the specific audio spectrum according to the detected signal-to-noise ratio.
Further, the pre-processed audio signal comparison is determined by a sound quality evaluation value, wherein,
if the sound quality evaluation value is smaller than a first preset sound quality evaluation value, judging that the second preset frequency is reduced to a corresponding value;
and if the sound quality evaluation value is greater than or equal to the first preset sound quality evaluation value and less than or equal to the second preset sound quality evaluation value, determining a judging mode aiming at the amplification of the specific audio frequency spectrum amplitude according to the measured signal-to-noise ratio.
Further, when the second preset frequency of the central control module is reduced to a corresponding value, a plurality of adjusting modes for reducing the second preset frequency are arranged in the central control module, wherein each adjusting mode is different in the amount of adjustment for reducing the second preset frequency.
Further, when the central control module determines the determination mode of the amplitude amplification of the specific audio frequency spectrum according to the measured signal-to-noise ratio, if the central control module determines that the amplitude amplification of the specific audio frequency spectrum does not meet a preset standard, the first preset frequency is increased to a corresponding value according to a difference value between a first preset signal-to-noise ratio and the signal-to-noise ratio of the pre-processed audio signal, or the amplitude of the low frequency audio frequency spectrum is increased to a corresponding value according to a difference value between the signal-to-noise ratio of the pre-processed audio signal and the first preset signal-to-noise ratio, or the amplitude of the intermediate frequency audio frequency spectrum is increased to a corresponding value according to a difference value between the signal-to-noise ratio of the pre-processed audio signal and the second preset signal-to-noise ratio.
Further, the comparison of the amplification decision of the specific audio frequency spectrum amplitude of the central control module is determined by the corresponding signal-to-noise ratio, wherein,
if the signal-to-noise ratio of the preprocessed audio signal is smaller than the first preset signal-to-noise ratio, the central control module increases the first preset frequency to a corresponding value;
if the signal-to-noise ratio of the preprocessed audio signal is greater than or equal to the first preset signal-to-noise ratio and smaller than the second preset signal-to-noise ratio, the central control module increases the amplitude of the low-frequency audio frequency spectrum to a corresponding value;
and if the signal-to-noise ratio of the preprocessed audio signal is greater than or equal to the second preset signal-to-noise ratio, the central control module increases the amplitude of the intermediate frequency audio frequency spectrum to a corresponding value.
Further, when the central control module judges that the amplitude of the low-frequency audio frequency spectrum is increased to a corresponding value, a plurality of adjustment modes for increasing the amplitude of the low-frequency audio frequency spectrum are arranged in the central control module, wherein the adjustment modes are different in adjustment magnitude for increasing the amplitude; and a plurality of correction modes for reducing the amplitude of the low-frequency audio frequency spectrum are further arranged in the central control module, wherein the correction of the amplitude reduction by each correction mode is different.
Further, when the central control module determines that the power of the superimposed audio signal is amplified, a plurality of adjustment modes for the power of the superimposed audio signal are arranged in the central control module, wherein each adjustment mode is different in adjustment magnitude for the power of the superimposed audio signal.
Compared with the prior art, the method has the beneficial effects that by detecting the adjusting mode of the power amplification of the audio signal when the loudness of the sound played by the loudspeaker array unit does not meet the preset standard, determining the judgment of the filtering range of the high-frequency audio frequency spectrum according to the sound quality evaluation value or determining the judgment mode of the amplitude amplification of the specific audio frequency spectrum according to the signal to noise ratio, and adjusting the corresponding parameters to the corresponding values according to the judgment, the quality of the sound amplification is ensured while the sound amplification effect is ensured.
Further, the invention carries out Fourier transform on the single audio signal to obtain a plurality of audio frequency spectrums, divides the audio frequency spectrums into a low-frequency audio frequency spectrum, a medium-frequency audio frequency spectrum and a high-frequency audio frequency spectrum, filters the high-frequency audio frequency spectrum to form a specific audio frequency spectrum, and ensures the denoising effect of tone quality.
Further, the central control module controls the detection module to detect the loudness of the sound played by the speaker array unit to determine whether the power amplification of the superimposed audio signal meets the requirement, if not, the power amplification of the audio signal is carried out, and if not, the sound quality evaluation value is further detected, so that the problem of the loudness of the sound played by the speaker array unit is solved.
Furthermore, the invention fits the calculated sound quality evaluation value, thereby accurately quantifying the evaluation mode of sound amplification and solving the problem that no scalar is used for evaluating and amplifying the effect.
Further, the central control module determines a decision mode for the pre-processed audio signal according to the sound quality evaluation value, and when the pre-processed audio signal is determined to not meet the preset standard, a solution is further provided, wherein the second preset frequency corresponding to the high-frequency audio spectrum in the step S3 is reduced to a corresponding value according to the difference between the first preset sound quality evaluation value and the sound quality evaluation value or the signal-to-noise ratio of the pre-processed audio signal is detected by the control detection module, and the central control module determines the decision mode for the amplification of the amplitude of the specific audio spectrum according to the measured signal-to-noise ratio, so that the solution when the pre-processed audio signal does not meet the preset requirement is solved.
Further, when the sound quality evaluation value is lower, the central control module determines that the high-frequency audio frequency spectrum is filtered to form a specific audio frequency spectrum, and when the high-frequency noise signals in the filtered sound signals are more, the central control module reduces the second preset frequency to achieve a better noise filtering effect.
Further, the central control module detects the signal-to-noise ratio of the preprocessed audio signal, and determines a judging mode for amplifying the specific audio frequency spectrum amplitude according to the detected signal-to-noise ratio, so that the problem in the amplifying process of the specific audio frequency spectrum amplitude is accurately judged.
Further, when the central control module judges that the amplitude of the low-frequency audio frequency spectrum is lower, the central control module increases the amplitude of the low-frequency audio frequency spectrum, so that the problem that the signal-to-noise ratio of the preprocessed audio signal does not reach the standard is solved.
Further, when the central control module completes the adjustment of the amplitude of the low-frequency audio frequency spectrum and the signal-to-noise ratio of the adjusted preprocessed audio signal is larger than the preset signal-to-noise ratio, the central control module further corrects the amplitude of the low-frequency audio frequency spectrum, and the adjustment accuracy is ensured.
Further, when the loudness of the sound played by the speaker array unit is low, the central control module amplifies the power of the superimposed audio signal to a corresponding value by using a corresponding preset loudness adjustment coefficient, so that the loudness of the amplified sound played by the speaker array unit is increased.
Drawings
FIG. 1 is a flow chart of a sound superposition amplifying method based on long distance according to the invention;
FIG. 2 is a flow chart of a decision method for the audio spectrum according to the present invention;
FIG. 3 is a flow chart of a decision method for the pre-processed audio signal according to the present invention;
fig. 4 is a flowchart of a method for determining the amplification of the specific audio spectrum according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, the data in this embodiment are obtained by comprehensively analyzing and evaluating the historical collected data and the corresponding historical collected results of half a year of operation by the long-distance-based sound superposition amplification method.
According to the sound superposition amplification method based on long distance, the numerical value of each preset parameter standard calculated in the current sound amplification is determined according to the frequency of 1448 audio frequency spectrums accumulated and collected in the first half year, the loudness of sound played by a loudspeaker array unit, a sound quality evaluation value and a signal to noise ratio. It will be understood by those skilled in the art that the determination manner of the system according to the present invention for the parameters mentioned above may be that the value with the highest duty ratio is selected as the preset standard parameter according to the data distribution, the weighted summation is used to take the obtained value as the preset standard parameter, each history data is substituted into a specific formula, and the value obtained by using the formula is taken as the preset standard parameter or other selection manner, as long as different specific conditions in the single item determination process can be definitely defined by the obtained value by the system according to the present invention are satisfied.
Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, which are respectively flowcharts of the long-distance-based sound superposition amplifying method according to the present invention; the invention discloses a judging mode flow chart aiming at an audio frequency spectrum; the invention discloses a flow chart aiming at a judging mode of the preprocessing audio signal; the invention provides a flow chart of a judging mode aiming at the amplification of the specific audio frequency spectrum amplitude.
In an embodiment of the present invention,
the input sound is set to 5 groups:
the long-distance-based sound superposition amplification method comprises the following steps:
step S1, respectively converting 5 groups of input acoustic signals into corresponding audio signals;
s2, carrying out Fourier transform on the single audio signal to obtain a plurality of audio frequency spectrums;
s3, the central control module divides the plurality of audio frequency spectrums into a low-frequency audio frequency spectrum, a medium-frequency audio frequency spectrum and a high-frequency audio frequency spectrum, and filters the high-frequency audio frequency spectrum to form a specific audio frequency spectrum;
step S4, the central control module amplifies the amplitude values of the low-frequency audio frequency spectrum and the medium-frequency audio frequency spectrum in the specific audio frequency spectrum to corresponding values respectively;
s5, performing inverse Fourier transform on the adjusted specific audio frequency spectrum to obtain a preprocessed audio signal;
s6, superposing a plurality of preprocessing audio signals, amplifying the power of the superposed audio signals, and then transmitting the amplified power to a loudspeaker array unit;
and S7, the central control module controls the detection module to detect the regulation mode of the power amplification of the audio signal when the loudness of the sound played by the loudspeaker array unit does not meet the preset standard, determines the judgment of the filtering range of the high-frequency audio frequency spectrum according to the sound quality evaluation value or determines the judgment mode of the amplitude amplification of the specific audio frequency spectrum according to the signal-to-noise ratio, and regulates the corresponding parameter to the corresponding value according to the judgment.
Further, in the step S3, the central control module controls the detection module to detect the frequency of the audio spectrum and determines a determination mode for the audio spectrum according to the detected frequency, wherein,
the first judging mode is that the central control module judges that the audio frequency spectrum belongs to a low-frequency audio frequency spectrum; the first judging mode meets the condition that the frequency of the audio frequency spectrum is smaller than a first preset frequency of 500Hz;
the second judging mode is that the central control module judges that the audio frequency spectrum belongs to an intermediate frequency audio frequency spectrum; the first judging mode meets the condition that the frequency of the audio frequency spectrum is larger than or equal to a first preset frequency and smaller than 4000Hz of a second preset frequency;
the third judging mode is that the central control module judges that the audio frequency spectrum belongs to a high-frequency audio frequency spectrum; the first judging mode meets the condition that the frequency of the audio frequency spectrum is larger than or equal to a first preset frequency and smaller than a second preset frequency.
Further, in step S7, the central control module controls the detection module to detect the loudness of the sound played by the speaker array unit, and determines a determination mode for amplifying the power of the audio signal superimposed in step S6 according to the loudness of the collected sound, where:
the first judging mode is that the central control module judges that the power amplification of the superimposed audio signal does not meet a preset standard, and determines an adjusting mode for the power amplification of the superimposed audio signal according to the difference between the preset loudness set in the central control module and the loudness of the sound played by the loudspeaker array unit measured by the detection module; the first judging mode meets the condition that the loudness of sound played by the loudspeaker array unit is smaller than the preset loudness by 130dB;
the second judging mode is that the central control module judges that the power amplification of the superimposed audio signal meets a preset standard, and determines the judging mode aiming at the preprocessed audio signal according to a sound quality evaluation value; the second judging mode meets the condition that the loudness of the sound played by the loudspeaker array unit is larger than or equal to the preset loudness.
Further, the central control module controls the detection module to detect the parameters of the sound played by the speaker array unit in the second determination mode, calculates the sound quality evaluation value C according to the detected parameters of the sound, and setsWhere k (j, α) is an amplitude value at a j-th frequency point of the α -th detection of the sound, i=0, 1,2.
Further, the central control module determines a decision mode for the preprocessed audio signal according to the sound quality evaluation value under a first preset condition, wherein,
the first pre-processing audio signal judging mode is that the central control module judges that the pre-processing audio signal does not accord with a preset standard, and the second preset frequency corresponding to the high-frequency audio frequency spectrum in the step S3 is reduced to a corresponding value according to a difference value between a first preset sound quality evaluation value and the sound quality evaluation value; the first preprocessing audio signal judging mode meets the condition that the sound quality evaluation value is smaller than a first preset sound quality evaluation value of 45.50;
the second pretreatment audio signal judging mode is that the central control module judges that the pretreatment audio signal does not accord with a preset standard, and controls the detection module to detect the signal-to-noise ratio of the pretreatment audio signal, and the central control module determines the judging mode aiming at the amplification of the specific audio frequency spectrum amplitude according to the detected signal-to-noise ratio; the second pre-processing audio signal judging mode meets the condition that the sound quality evaluation value is greater than or equal to the first preset sound quality evaluation value and less than or equal to a second preset sound quality evaluation value 88.30;
the third pretreatment audio signal judging mode is that the central control module judges that the pretreatment audio signals accord with preset standards, and the pretreatment audio signals accord with the preset standards are overlapped, then power amplification is carried out, and the power amplification is carried out and is transmitted to the loudspeaker array unit; the third preprocessing audio signal judgment mode satisfies that the sound quality evaluation value is larger than the second preset sound quality evaluation value;
and the first preset condition meets the requirement that the central control module meets the requirement of completing the calculation of the sound quality evaluation value.
Further, the central control module calculates a difference between the first preset sound quality evaluation value and the sound quality evaluation value in a first pre-processing audio signal judgment mode, marks the difference as a sound quality difference, and determines an adjustment mode for the second preset frequency according to the sound quality difference, wherein,
the first adjusting mode is that the central control module uses a first preset frequency adjusting coefficient of 0.96 to reduce the second preset frequency to a corresponding value; the first adjustment mode satisfies that the sound quality difference is less than a first preset sound quality difference of 8.55;
the second adjusting mode is that the central control module uses a second preset frequency adjusting coefficient of 0.92 to reduce the second preset frequency to a corresponding value; the second adjusting mode meets the condition that the sound quality difference value is more than or equal to the first preset sound quality difference value and less than a second preset sound quality difference value by 16.23;
the third adjusting mode is that the central control module uses a third preset frequency adjusting coefficient of 0.85 to reduce the second preset frequency to a corresponding value; the third adjustment mode satisfies that the sound quality difference value is greater than or equal to the second preset sound quality difference value.
Further, the central control module controls the detection module to detect the signal-to-noise ratio of the preprocessed audio signal in a second preprocessed audio signal judging mode, and determines a judging mode for amplifying the specific audio frequency spectrum amplitude according to the detected signal-to-noise ratio, wherein,
the first amplitude judging mode is that the central control module judges that the specific audio frequency spectrum amplitude amplification does not accord with a preset standard, and the first preset frequency is increased to a corresponding value according to the difference value between a first preset signal-to-noise ratio and the signal-to-noise ratio of the preprocessed audio signal; the first judging mode meets the condition that the signal to noise ratio of the preprocessed audio signal is smaller than a first preset signal to noise ratio by 23.25dB;
the second amplitude value judging mode is that the central control module judges that the amplitude value amplification of the specific audio frequency spectrum does not meet a preset standard, and the amplitude value of the low-frequency audio frequency spectrum is increased to a corresponding value according to the difference value between the signal-to-noise ratio of the preprocessed audio signal and the first preset signal-to-noise ratio; the second judging mode meets the condition that the signal-to-noise ratio of the preprocessed audio signal is larger than or equal to the first preset signal-to-noise ratio and smaller than 34.58dB of a second preset signal-to-noise ratio;
the third amplitude value judging mode is that the central control module judges that the amplitude value amplification of the specific audio frequency spectrum does not meet a preset standard, and the amplitude value of the intermediate frequency audio frequency spectrum is increased to a corresponding value according to the difference value between the signal-to-noise ratio of the preprocessed audio signal and the second preset signal-to-noise ratio; the third judging mode meets the condition that the signal to noise ratio of the preprocessed audio signal is larger than or equal to the second preset signal to noise ratio.
Further, the central control module calculates the difference between the signal-to-noise ratio of the preprocessed audio signal and the first preset signal-to-noise ratio in a second amplitude judgment mode and defines the difference as an amplitude difference, and the central control module determines an adjustment mode for the amplitude of the low-frequency audio frequency spectrum according to the amplitude difference, wherein,
the first amplitude adjustment mode is that the central control module increases the amplitude of the low-frequency audio frequency spectrum to a corresponding value by using a first preset amplitude adjustment coefficient 1.02; the first amplitude adjustment mode satisfies that the amplitude difference is smaller than a first preset amplitude difference of 2.56;
the second amplitude adjustment mode is that the central control module increases the amplitude of the low-frequency audio frequency spectrum to a corresponding value by using a second preset amplitude adjustment coefficient 1.04; the second amplitude adjustment mode meets the condition that the amplitude difference value is larger than or equal to the first preset amplitude difference value and smaller than a second preset amplitude difference value by 8.32;
the third amplitude adjustment mode is that the central control module increases the amplitude of the low-frequency audio frequency spectrum to a corresponding value by using a third preset amplitude adjustment coefficient of 1.09; the third amplitude adjustment mode meets the condition that the amplitude difference value is larger than or equal to the second preset amplitude difference value;
further, the central control module calculates the difference between the signal-to-noise ratio of the preprocessed audio signal and the preset signal-to-noise ratio under a second preset condition, marks the difference as a correction difference, and determines a correction mode for the amplitude of the low-frequency audio frequency spectrum according to the correction difference,
the first correction mode is that the central control module uses a first preset correction coefficient of 0.998 to reduce the amplitude of the low-frequency audio frequency spectrum to a corresponding value; the first correction mode meets the condition that the correction difference value is smaller than a first preset correction difference value of 1.02;
the second correction mode is that the central control module uses a second preset correction coefficient of 0.996 to reduce the amplitude of the low-frequency audio frequency spectrum to a corresponding value; the second correction mode meets the condition that the correction difference is more than or equal to the first preset correction difference and less than the second preset correction difference by 2.44;
the third correction mode is that the central control module uses a third preset correction coefficient of 0.992 to reduce the amplitude of the low-frequency audio frequency spectrum to a corresponding value; the third correction mode meets the condition that the correction difference value is larger than or equal to the second preset correction difference value;
the second preset condition satisfies that the central control module completes the adjustment of the amplitude of the low-frequency audio frequency spectrum, and the signal to noise ratio of the adjusted preprocessed audio signal is greater than 24.32 of a preset signal to noise ratio.
Further, the central control module calculates the difference between the preset loudness and the loudness of the sound played by the speaker array unit measured by the detection module, defines the difference as a loudness difference, and determines an adjustment mode for the power of the superimposed audio signal according to the loudness difference, wherein,
the first loudness adjustment mode is that the central control module amplifies the power of the superimposed audio signal to a corresponding value by using a first preset loudness adjustment coefficient 1.02; the first loudness adjustment mode satisfies that the loudness difference is smaller than a first preset loudness difference 11.02;
the second loudness adjustment mode is that the central control module amplifies the power of the superimposed audio signal to a corresponding value by using a second preset loudness adjustment coefficient of 1.05; the second loudness adjustment mode meets the condition that the loudness difference is greater than or equal to the first preset loudness difference and less than a second preset loudness difference of 18.25;
the third loudness adjustment mode is that the central control module amplifies the power of the superimposed audio signal to a corresponding value by using a third preset loudness adjustment coefficient of 1.08; the third loudness adjustment mode meets the condition that the loudness difference value is larger than or equal to the second preset loudness difference value.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The long-distance-based sound superposition amplification method is characterized by comprising the following steps of:
step S1, respectively converting a plurality of input acoustic signals into corresponding audio signals;
s2, carrying out Fourier transform on the single audio signal to obtain a plurality of audio frequency spectrums;
s3, dividing the audio frequency spectrums into a low-frequency audio frequency spectrum, a medium-frequency audio frequency spectrum and a high-frequency audio frequency spectrum, and filtering the high-frequency audio frequency spectrum to form a specific audio frequency spectrum;
step S4, respectively amplifying the amplitudes of the low-frequency audio frequency spectrum and the medium-frequency audio frequency spectrum in the specific audio frequency spectrum to corresponding values;
s5, performing inverse Fourier transform on the adjusted specific audio frequency spectrum to obtain a preprocessed audio signal;
s6, superposing a plurality of preprocessing audio signals, amplifying the power of the superposed audio signals, and then transmitting the amplified power to a loudspeaker array unit;
and S7, the central control module controls the detection module to detect the regulation mode of the power amplification of the audio signal when the loudness of the sound played by the loudspeaker array unit does not meet the preset standard, determines the judgment of the filtering range of the high-frequency audio frequency spectrum according to the sound quality evaluation value or determines the judgment mode of the amplitude amplification of the specific audio frequency spectrum according to the signal-to-noise ratio, and regulates the corresponding parameter to the corresponding value according to the judgment.
2. The method of claim 1, wherein in step S3, the audio spectrum comparison mode of the central control module is determined by the frequency of the corresponding audio spectrum, and if the frequency of the audio spectrum is smaller than a first preset frequency, it is determined that the audio spectrum belongs to a low-frequency audio spectrum; if the frequency of the audio frequency spectrum is larger than or equal to the first preset frequency and smaller than the second preset frequency, judging that the audio frequency spectrum belongs to an intermediate frequency audio frequency spectrum; and if the frequency of the audio frequency spectrum is greater than or equal to the second preset frequency, judging that the audio frequency spectrum belongs to a high-frequency audio frequency spectrum.
3. The method according to claim 2, wherein in the step S7, when the central control module determines the mode of determining the power amplification of the audio signal after the superposition in the step S6 according to the loudness of the sound played by the speaker array unit, the central control module determines the mode of adjusting the power amplification of the audio signal after the superposition according to the difference between the preset loudness set in the central control module and the loudness of the sound played by the speaker array unit measured by the detection module, or determines the mode of determining the pre-processed audio signal according to the sound quality evaluation value C.
4. The long-distance-based sound superposition amplification method according to claim 3, wherein said central control module sets said sound quality evaluationWherein k (j, α) is an amplitude value at a j-th frequency point of the α -th detection of the sound, i=0, 1,2..α, α is a total frame number of the sound fragment; if the pre-processed audio signal does not meet the preset standard, the high-frequency audio spectrum in the step S3 is corresponding to the difference between the first preset sound quality evaluation value and the sound quality evaluation valueAnd the second preset frequency is reduced to a corresponding value, or the control detection module detects the signal-to-noise ratio of the preprocessed audio signal and determines a judging mode aiming at the amplification of the specific audio frequency spectrum amplitude according to the detected signal-to-noise ratio.
5. The long-range-based sound superposition amplification method according to claim 4, wherein said preprocessed audio signal comparison is determined by a sound quality evaluation value, wherein,
if the sound quality evaluation value is smaller than a first preset sound quality evaluation value, judging that the second preset frequency is reduced to a corresponding value;
and if the sound quality evaluation value is greater than or equal to the first preset sound quality evaluation value and less than or equal to the second preset sound quality evaluation value, determining a judging mode aiming at the amplification of the specific audio frequency spectrum amplitude according to the measured signal-to-noise ratio.
6. The method according to claim 5, wherein when the second preset frequency is reduced to a corresponding value, a plurality of adjustment modes for reducing the second preset frequency are set in the central control module, wherein each adjustment mode is different in adjustment for reducing the second preset frequency.
7. The long-distance-based sound superposition amplification method according to claim 5, wherein said central control module increases said first preset frequency to a corresponding value according to a difference between a first preset signal-to-noise ratio and a signal-to-noise ratio of said pre-processed audio signal, increases said amplitude of said low-frequency audio spectrum to a corresponding value according to a difference between a signal-to-noise ratio of said pre-processed audio signal and said first preset signal-to-noise ratio, or increases said amplitude of said intermediate-frequency audio spectrum to a corresponding value according to a difference between a signal-to-noise ratio of said pre-processed audio signal and said second preset signal-to-noise ratio, when said central control module determines that said specific audio spectrum amplitude amplification does not meet a preset criterion, according to a measured signal-to-noise ratio.
8. The method of claim 7, wherein the comparison of the amplification decisions of the central control module specific audio spectrum amplitude is determined by the corresponding signal to noise ratio,
if the signal-to-noise ratio of the preprocessed audio signal is smaller than the first preset signal-to-noise ratio, the central control module increases the first preset frequency to a corresponding value;
if the signal-to-noise ratio of the preprocessed audio signal is greater than or equal to the first preset signal-to-noise ratio and smaller than the second preset signal-to-noise ratio, the central control module increases the amplitude of the low-frequency audio frequency spectrum to a corresponding value;
and if the signal-to-noise ratio of the preprocessed audio signal is greater than or equal to the second preset signal-to-noise ratio, the central control module increases the amplitude of the intermediate frequency audio frequency spectrum to a corresponding value.
9. The long-distance-based sound superposition amplification method according to claim 8, wherein when said central control module determines to increase the amplitude of said low-frequency audio spectrum to a corresponding value, a plurality of adjustment modes for increasing the amplitude of the low-frequency audio spectrum are provided in said central control module, wherein each adjustment mode has a different adjustment magnitude for increasing the amplitude; and a plurality of correction modes for reducing the amplitude of the low-frequency audio frequency spectrum are further arranged in the central control module, wherein the correction of the amplitude reduction by each correction mode is different.
10. A long distance based sound superposition amplifying method according to claim 3 and wherein when said central control module determines that the power of the superimposed audio signal is amplified, a plurality of adjustment modes for the power of the superimposed audio signal are provided in said central control module, wherein each adjustment mode is different in the adjustment of the power of the superimposed audio signal.
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