CN112634814B - Rhythm control method of LED three-dimensional stereoscopic display following music - Google Patents
Rhythm control method of LED three-dimensional stereoscopic display following music Download PDFInfo
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- CN112634814B CN112634814B CN202011380070.6A CN202011380070A CN112634814B CN 112634814 B CN112634814 B CN 112634814B CN 202011380070 A CN202011380070 A CN 202011380070A CN 112634814 B CN112634814 B CN 112634814B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a rhythm control method of an LED three-dimensional stereoscopic display following music, and belongs to the technical field of three-dimensional LED stereoscopic display. The rhythm control method comprises the following steps: step one, music sampling is carried out on a sound signal; performing FFT (fast Fourier transform) on the sampling content, extracting the frequency spectrum of the signal, and further obtaining the rhythm of the music; setting a rhythm timer of the singlechip according to the rhythm of the music, realizing that the timer is interrupted at the accent position of the music, executing a specified LED display effect, and realizing that the LED displays or changes along with the rhythm of the music; and step four, returning to the step one after a section of music. The method can automatically identify strong and weak sounds in music, can identify that each beat is composed of a plurality of n minutes of notes, and changes the effect according to the flexible rhythm change of the n minutes of notes, thereby presenting the music lamp effects of abundant, hierarchical, surge and surge.
Description
Technical Field
The invention relates to a rhythm control method of an LED three-dimensional stereoscopic display following music, and belongs to the technical field of three-dimensional LED stereoscopic display.
Background
The music light show is that a music control system is added on the basis of program control light, a computer decodes and codes audio signals by identifying the audio signals, and finally outputs the signals to the control system, so that the layout change of the light and the music rhythm change are kept synchronous, the perfect combination of the change of the light and the color and the music emotion is achieved, the music connotation and theme are reflected, the unification of the music and the light is realized, and the light performance is more vivid and more artistic.
The music light show is mainly applied to the performance places such as large squares, malls, theme parks, playgrounds and the like, adds beautiful visual and auditory feast for people, and is a romantic and leisure entertainment item in fast-paced urban life at night.
The current music rhythm recognition algorithm for the music light show can only calculate the rhythm, and reckon the emotion of the music to be expressed by a large probability, such as shocking, thinking, expressing, joying, exciting, sadness, joy, hot and the like. No algorithm can provide an easily understood mode for a user at present, sets a three-dimensional display light show in a song, and changes the effect according to the flexible n minutes note rhythm, thereby presenting more abundant, more hierarchical, more surge-excited music light effects.
Disclosure of Invention
The invention aims to provide a rhythm control method of an LED three-dimensional stereoscopic display following music, and aims to solve the problem in the prior art.
A rhythm control method of an LED three-dimensional stereoscopic display following music comprises the following steps:
step one, music sampling is carried out on a sound signal;
performing FFT (fast Fourier transform) on the sampling content, extracting the frequency spectrum of the signal, and further obtaining the rhythm of the music;
setting a rhythm timer of the singlechip according to the rhythm of the music, realizing that the timer is interrupted at the accent position of the music, executing a specified LED display effect, and realizing that the LED displays or changes along with the rhythm of the music;
and step four, returning to the step one after a section of music.
Further, in the step one, the method specifically comprises the following steps:
step one, converting a received sound signal into a digital signal through an ADC (analog-to-digital converter);
and step two, setting the total sampling time length as T and the number of sampling points as N, and calculating to obtain a sampling time interval T as T/N, namely, sampling the music sound intensity once every T, and sampling for N times in total.
Further, in the second step, the method specifically comprises the following steps:
performing FFT (fast Fourier transform) on the sampling content, transforming a time domain signal to a frequency domain, and extracting a frequency spectrum of the signal;
and step two, obtaining the frequency spectrum, comparing to obtain a peak frequency, and obtaining a time interval between two adjacent accents, namely the rhythm of the music according to the sampling frequency f which is equal to T/N.
Further, in the third step, the following contents are specifically included,
setting a rhythm array:
the rhythm array takes a beat as a bar, if the music has b bars, the number of the digital elements in the rhythm array is a multiplied by b, the sum of the animation change times of the LED three-dimensional display screen is the sum of all the digital element contents in the rhythm array, wherein, a certain element value in the rhythm array is set as n, when n is not 0, the appointed beat is composed of n 1/n beat symbols, and the picture of the LED three-dimensional display screen changes along with the change of the note; when n is 0, the shooting is interrupted, and the picture of the LED three-dimensional display screen is kept unchanged;
the implementation method comprises the following steps:
executing a Modify _ pSpeed _ By _ BeatArray function when a timer for controlling the animation of the LED three-dimensional display screen is interrupted, wherein the function is used for calculating the time difference between the next animation effect and the current animation effect and then modifying the interruption time length of the timer into the time difference, and the calculation process involves the following important variables:
pArray: a rhythm array address specified by the animation effect; pArray [ i ] refers to the content of the ith element of the array;
iArrayNum: the number of beats in the tempo array;
and (ii) iSum: numbering the steps of the current animation;
iStandSpeed: the standard rhythm value is the interval duration of strong sound and weak sound in the music;
PiSpeed: under the calculated current iSum serial number, the time interval value between the next animation change and the current change,
the function is executed as follows:
step three, traversing the rhythm array elements, and summing the first i array elements from the beginning in sequence until the sum value iSUMBeform is greater than or equal to the step number iSum of the current animation, wherein the value i at the moment is the element number to be further calculated;
step two, if the requirement of isumBeform > iSum at the moment, the stopping calculation of a certain element which is not 0 in the rhythm array is represented, and at the moment, the speed value is only required to be set as a quotient obtained by dividing the standard interval value by the element of the current array, namely speed ═ iStandspeed/pArray [ i ];
step three, if the requirement of isumBeform ═ iSum at this time is met, the sum of the first i elements of the rhythm array is represented, and is exactly equal to the step value, at this time, whether elements 0 still exist between the value of the element behind the ith element of the rhythm array and the value of the next element which is not 0 needs to be calculated, the number of the elements 0 is set to be iZeroNum, and the calculation is considered in two cases:
if iezeronum is 0, i.e. the i +1 th element of the rhythm array is not 0, then the velocity value is calculated in the same step 2, i.e. pireed is iostandspeed/par ray;
i.e. the tempo array from the i +1 th element to the i + i zeronum elements are all 0, then the next change needs to go through i zeronum beats, i.e. piseed i standard speed i zeronum.
The main advantages of the invention are: the rhythm control method of the LED three-dimensional stereoscopic display following the music does not need to manually arrange the light and color changes of the three-dimensional LED lamp according to the music, can automatically identify the strong and weak sounds in the music, can identify that each beat consists of a plurality of n minutes of notes, automatically sets a three-dimensional display light show in a song according to the identification result, and performs effect change according to the flexible n minutes of rhythm note change, thereby presenting richer, more layered and more enthusiastic music lamp effects.
Drawings
Fig. 1 is a flow chart of a method of rhythm control of an LED three-dimensional stereoscopic display following music according to the present invention;
fig. 2 is a schematic diagram of the time domain to frequency domain variation of a fourier signal.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fourier transform algorithms are capable of transforming the sound signal into the frequency domain. The signals are very difficult to see characteristics in a time domain, corresponding regular information can be mined if the signals are converted into a frequency domain, and the signal frequency with the maximum modulus in the frequency domain is the beat frequency in music. The acquired audio signals are subjected to Fourier transform through the single chip microcomputer, and envelope signals corresponding to the audio signals are generated, so that the position and the rhythm of the starting point of music stress are determined. The music rhythm identification process comprises the following steps:
referring to fig. 1, a rhythm control method of an LED three-dimensional stereoscopic display following music, the rhythm control method comprising the steps of:
step one, music sampling is carried out on a sound signal;
step two, referring to fig. 2, performing FFT discrete fourier transform on the sampled content, extracting the frequency spectrum of the signal, and further obtaining the rhythm of the music;
setting a rhythm timer of the singlechip according to the rhythm of the music, realizing that the timer is interrupted at the accent position of the music, executing a specified LED display effect, and realizing that the LED displays or changes along with the rhythm of the music;
and step four, returning to the step one after a section of music to prevent the music from being changed and calculate the rhythm in real time.
Further, in the step one, the method specifically comprises the following steps:
step one, converting a received sound signal into a digital signal through an ADC (analog-to-digital converter);
and step two, setting the total sampling time length as T and the number of sampling points as N, and calculating to obtain a sampling time interval T as T/N, namely, sampling the music sound intensity once every T, and sampling for N times in total.
Specifically, the accent in music is mainly the sound with higher intensity in music, and is the main note forming the rhythm, most commonly the drum sound. For music with more pronounced accents, the time interval between the loud (dong) and the sub-loud (Da) is about 0.5-1 second, and in this embodiment, the sampling time is selected to be 4 beats, about 2-4 seconds. Because the tempo needs to be calculated as soon as possible, the algorithm sets the total sampling duration T to be 2 seconds, the number of sampling points N to be 128 points, and calculates the sampling time interval T to be T/N to be 2 seconds/128 to be 15.625 milliseconds, that is, music intensity sampling is performed every 15.625 milliseconds, and the sampling is performed 128 times in total.
Further, in the second step, the method specifically comprises the following steps:
performing FFT (fast Fourier transform) on the sampling content, transforming a time domain signal to a frequency domain, and extracting a frequency spectrum of the signal;
and step two, obtaining the frequency spectrum, comparing to obtain a peak frequency, and obtaining a time interval between two adjacent accents, namely the rhythm of the music according to the sampling frequency f which is equal to T/N.
Further, in the third step, the following contents are specifically included,
setting a rhythm array:
the rhythm array takes a element numbers, namely a beats as a bar, if the music has b bars, the number of the digital elements in the rhythm array is a multiplied by b, the sum of the animation change times of the LED three-dimensional display screen is the sum of all the digital element contents in the rhythm array, wherein, a certain element value in the rhythm array is set as n, when n is not 0, the appointed beats are composed of n 1/n beat symbols, and the picture of the LED three-dimensional display screen changes along with the change of the notes; when n is 0, the shooting is interrupted, and the picture of the LED three-dimensional display screen is kept unchanged;
in the present embodiment of the present invention,
the implementation method comprises the following steps: the invention innovatively adopts the control array to control the animation rhythm change of the three-dimensional stereoscopic display. The basic tempo interval of the melody music, i.e., the time period between a strong sound and a weak sound in the music, is calculated, and the time period is designated as a "standard interval", i.e., "one beat".
Dividing the beat value by n to obtain 1/n beat, wherein the larger the n value is, the faster the change speed is. For example, the common beat values are as follows: divide by 2 to obtain 1/2 beats, divide by 3 to obtain 1/3 beats, divide by 4 to obtain 1/4 beats, divide by 8 to obtain 1/8 beats, and divide by 16 to obtain 1/16 beats.
The rhythm array of the embodiment takes 8 numbers (namely 8 beats) as a bar, and the length of the array can be flexibly set according to different bar amounts of the music bar. For example, music is composed of 16 bars, i.e., 16 beats and 8 beats, the number elements of the array are 16 × 8 — 128, and the sum of the number of elements of the array is the sum of animation change times of the three-dimensional stereoscopic display. Each number n in the array represents that the bar is split into n 1/n notes, for example, a bar in a rhythm array is taken, each "clang" or "clang" is an animation change time point of the three-dimensional display, and the values and corresponding contents are as follows:
{1,1,1,2,1,1,1,2}, wherein the animation change rhythm is 'clang, Da, dong, and Da';
{1,1,2,1,2,2,2,1}, wherein the animation change rhythm is 'clang, Da, dong-dong, and Da';
{3,1,3,1,2,2,3, 1}, wherein the animation change rhythm is 'clattering-clattering, pyridazing, clattering-clattering, and clattering'.
If the value of a certain array element is 0, the beat is not animated, namely, a beat-breaking process is performed, and the pause process of a certain point in the rhythm on a certain picture is realized to enhance the visual impact.
For example, if the interval duration of one beat is calculated to be 1 second, the values of the array and the corresponding contents are as follows:
{4,0,4,0,4,0,0,0}, with animation change tempo: the first beat (first 1 second) is cut into 4 1/4 notes, the second beat is cut off (picture is still for 1 second), the third beat is cut into 4 1/4 notes, the fourth beat is cut off, the fifth beat is cut into 4 1/4 notes, and the 6 th, 7 th and 8 th beats are cut off (picture is still for 3 seconds). The method comprises the following specific steps: changing every 1/4 seconds, and after changing 4 times, still picture for 1 second; changing every 1/4 seconds, and after changing 4 times, still picture for 1 second; the picture was changed every 1/4 seconds, and after changing 4 times, the picture was still for 3 seconds.
The implementation method comprises the following steps:
executing a Modify _ pSpeed _ By _ BeatArray function when a timer for controlling the animation of the LED three-dimensional display screen is interrupted, wherein the function is used for calculating the time difference between the next animation effect and the current animation effect and then modifying the interruption time length of the timer into the time difference, and the calculation process involves the following important variables:
pArray: a rhythm array address specified by the animation effect; pArray [ i ] refers to the content of the ith element of the array;
iArrayNum: the number of beats in the tempo array;
and (ii) iSum: numbering the steps of the current animation;
iStandSpeed: the standard rhythm value is the interval duration of strong sound and weak sound in the music;
PiSpeed: under the calculated current iSum serial number, the time interval value between the next animation change and the current change,
the function is executed as follows:
step three, traversing the rhythm array elements, and summing the first i array elements from the beginning in sequence until the sum value iSUMBeform is greater than or equal to the step number iSum of the current animation, wherein the value i at the moment is the element number to be further calculated;
step two, if the isumberofe > iSum is satisfied at this time, the calculation of the current stay of a certain element other than 0 in the rhythm array is represented, for example, in the {4,0,0,0} array, i ═ 1, i ═ 2, i ═ 3, at this time, only the speed value needs to be set as the quotient of the standard interval value divided by the current array element, that is, speed ═ iStandSpeed/par [ i ];
step three, if the requirement of isumBeform ═ iSum at this time is met, the sum of the first i elements of the rhythm array is represented, and is exactly equal to the step value, at this time, whether elements 0 still exist between the value of the element behind the ith element of the rhythm array and the value of the next element which is not 0 needs to be calculated, the number of the elements 0 is set to be iZeroNum, and the calculation is considered in two cases:
if iezeronum is 0, i.e. the i +1 th element of the rhythm array is not 0, then the velocity value is calculated in the same step 2, i.e. pireed is iostandspeed/par ray;
i.e. the tempo array from the i +1 th element to the i + i zeronum elements are all 0, then the next change needs to go through i zeronum beats, i.e. piseed i standard speed i zeronum.
Specifically, there are several important parameters to be used in the implementation algorithm:
Claims (3)
1. a rhythm control method of an LED three-dimensional stereoscopic display following music is characterized by comprising the following steps:
step one, music sampling is carried out on a sound signal;
performing FFT (fast Fourier transform) on the sampling content, extracting the frequency spectrum of the signal, and further obtaining the rhythm of the music;
setting a rhythm timer of the singlechip according to the rhythm of the music, realizing that the timer is interrupted at the accent position of the music, executing a specified LED display effect, and realizing that the LED displays or changes along with the rhythm of the music;
step four, returning to the step one after a section of music,
in the third step, the following contents are specifically included,
setting a rhythm array:
the rhythm array takes a beat as a bar, if the music has b bars, the number of the digital elements in the rhythm array is a multiplied by b, the sum of the animation change times of the LED three-dimensional display screen is the sum of all the digital element contents in the rhythm array, wherein, a certain element value in the rhythm array is set as n, when n is not 0, the appointed beat is composed of n 1/n beat symbols, and the picture of the LED three-dimensional display screen changes along with the change of the note; when n is 0, the shooting is interrupted, and the picture of the LED three-dimensional display screen is kept unchanged;
the implementation method comprises the following steps:
executing a Modify _ pSpeed _ By _ BeatArray function when a timer for controlling the animation of the LED three-dimensional display screen is interrupted, wherein the function is used for calculating the time difference between the next animation effect and the current animation effect, and then modifying the interruption time length of the timer into the time difference, and the calculation process involves the following important variables:
pArray: a rhythm array address specified by the animation effect; pArray [ i ] refers to the content of the ith element of the array;
iArrayNum: the number of beats in the tempo array;
and (ii) iSum: numbering the steps of the current animation;
iStandSpeed: the standard rhythm value is the interval duration of strong sound and weak sound in the music;
PiSpeed: under the calculated current iSum serial number, the time interval value between the next animation change and the current change,
the function is executed as follows:
step three, traversing the rhythm array elements, and summing the first i array elements from the beginning in sequence until the sum value iSUMBeform is greater than or equal to the step number iSum of the current animation, wherein the value i at the moment is the element number to be further calculated;
step two, if the requirement of isumBeform > iSum at the moment, the stopping calculation of a certain element which is not 0 in the rhythm array is represented, and at the moment, the speed value is only required to be set as a quotient obtained by dividing the standard interval value by the element of the current array, namely speed ═ iStandspeed/pArray [ i ];
step three, if the requirement of isumBeform ═ iSum at this time is met, the sum of the first i elements of the rhythm array is represented, and is exactly equal to the step value, at this time, whether elements 0 still exist between the value of the element behind the ith element of the rhythm array and the value of the next element which is not 0 needs to be calculated, the number of the elements 0 is set to be iZeroNum, and the calculation is considered in two cases:
if iezeronum is 0, i.e. the i +1 th element of the rhythm array is not 0, then the velocity value is calculated in the same step 2, i.e. pireed is iostandspeed/par ray;
i.e. the tempo array from the i +1 th element to the i + i zeronum elements are all 0, then the next change needs to go through i zeronum beats, i.e. piseed i standard speed i zeronum.
2. The method as claimed in claim 1, wherein the first step comprises the following steps:
step one, converting a received sound signal into a digital signal through an ADC (analog-to-digital converter);
and step two, setting the total sampling time length as T and the number of sampling points as N, and calculating to obtain a sampling time interval T as T/N, namely, sampling the music sound intensity once every T, and sampling for N times in total.
3. The method for controlling the rhythm of the LED three-dimensional stereoscopic display following music according to claim 1, wherein in the step two, the method specifically comprises the following steps:
performing FFT (fast Fourier transform) on the sampling content, transforming a time domain signal to a frequency domain, and extracting a frequency spectrum of the signal;
and step two, obtaining the frequency spectrum, comparing to obtain a peak frequency, and obtaining a time interval between two adjacent accents, namely the rhythm of the music according to the sampling frequency f which is equal to T/N.
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