CN110853673A - Drum stick pairing method based on resonance spectrum identification - Google Patents

Drum stick pairing method based on resonance spectrum identification Download PDF

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CN110853673A
CN110853673A CN201810815432.6A CN201810815432A CN110853673A CN 110853673 A CN110853673 A CN 110853673A CN 201810815432 A CN201810815432 A CN 201810815432A CN 110853673 A CN110853673 A CN 110853673A
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林天福
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Zhangzhou Sino Flag Musical Instrument Co Ltd
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    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
    • G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band

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Abstract

The invention relates to a drumstick pairing method based on resonance spectrum recognition, which comprises the steps of obtaining an audio signal which is shot by a single drumstick, converting the audio signal into an audio digital signal and transmitting the audio digital signal to a computer; performing fast Fourier transform on the audio digital signal to obtain the frequency spectrum of the audio digital signal, and omitting a low-frequency interference signal; the method comprises the following steps of (1) completing the tone acquisition and recording of an n-order resonance frequency point fn of a single drum stick; and matching the two drumsticks with the highest coincidence degree of the score acquisition values. According to the method, the audio frequency generated by knocking of a single drumstick is collected and analyzed, a comparison database is established, the audio frequency information of the drumsticks is compared one by one, accurate pairing of the two drumsticks in a batch of drumsticks is finally achieved, the paired drumsticks are high in tone color conformity, and the pursuit of the percussion enthusiasts on high quality of music is greatly improved.

Description

Drum stick pairing method based on resonance spectrum identification
Technical Field
The invention belongs to the field of resonance spectrum detection, and particularly relates to a drumstick pairing method based on resonance spectrum identification.
Background
One drummer is excellent not only in that they have a skilled striking skill, but also in that they have a good quality drumstick that is comfortable. Beginners can be confused when choosing drum sticks when beginning to learn the drum set, the brands, models and materials of the drum sticks are various and are unsmooth, and the quality of the drum sticks can not be judged from the aspects of appearance and weight. A pair of drum sticks is randomly selected, so that beginners can eat up the drum sticks when practicing. The head shape, material, specification and color of each drum stick are consistent, but the hit high and low sounds are different, so that the hitting effect on music cannot be mastered, and the interest on the hitting music is eliminated. Actually, what really determines the quality of the drumsticks is the timbre of the drumsticks, and if one pair of drumsticks has a difference in pitch, the timbre of the same beating in playing will be different, which is a great taboo for the drummers to play. Therefore, before each pair of drum sticks leaves the factory, a producer of the drum sticks needs to ensure that the head type, the material, the specification and the color of each drum stick in each pair of drum sticks are consistent, and also needs to ensure that the pitches of the two drum sticks are matched and the tone is harmonious, so that the producer needs to match the pitches of the drum sticks before the drum sticks come into the market, and the producer can ensure that a drummer is combined with the drum sticks when playing, so that the drummers and the drum sticks are fused into a whole and the best effect is achieved.
At present, only a few large and dignifiable companies have the same kind of technology internationally, but the technology belongs to commercial confidentiality, so that relevant information is not disclosed. Other drum stick manufacturers in China do not master pitch matching technology, and the match is only carried out on the weight of the drum stick through weighing by an electronic scale before the drum stick leaves a factory, so that the hand feeling of the drum stick in a hand of a batter is consistent, but the most important part for determining the mass of the drum stick, namely the tone, is ignored. The invention relates to a drum stick pairing method based on resonance spectrum identification, which is used for pairing a plurality of independent pitches emitted by each drum stick when the drum stick is struck with a plurality of independent pitches emitted by the other drum stick when the drum stick is struck, so that the pitch difference between the two drum sticks is minimized, the problem of unpaired high and low pitches between the two drum sticks is solved, and the effect of beautiful and harmonious tone is achieved.
Disclosure of Invention
The invention aims to solve the technical problem that a drum stick pairing method based on resonance spectrum recognition is provided for the current situation, and the accurate pairing of two drum sticks in batch of drum sticks is finally realized by collecting and analyzing the pitch generated by knocking of a single drum stick.
In order to solve the technical problem, the invention is realized as follows: the invention discloses a drumstick pairing method based on resonance spectrum identification, which comprises the following steps:
1) acquiring an audio signal generated by knocking a single drumstick, converting the audio signal into an audio digital signal and transmitting the audio digital signal to a computer;
2) performing fast Fourier transform on the audio digital signal to obtain the frequency spectrum of the audio digital signal, and omitting a low-frequency interference signal;
3) n-order resonance frequency point f of single drum rodnCollecting and recording the sound score;
4) and matching the two drumsticks with the highest coincidence degree of the score acquisition values.
Wherein the content of the first and second substances,
the audio signal sent by the knocking of a single drum stick is obtained by continuously picking up an external audio signal through a non-contact acoustic sensor in communication connection with a computing mechanism, and when the amplitude of the obtained audio signal exceeds a preset value, a recording system is triggered and the audio signal with a fixed period is recorded.
Furthermore, the non-contact acoustic sensor inputs the recorded audio signal into an analog-to-digital conversion card after gain, converts the audio signal into a digital signal at a set sampling rate, and transmits the digital signal to a computer.
Further, the fundamental frequency point f of the resonance of a single drum rod1For obtaining the maximum amplitude point of the frequency spectrum in a set range and then according to the nth order resonance frequency point fnAnd fundamental frequency point f1The relationship between the two is used for judging the position of the nth order resonance frequency point:
Figure BSA0000167638290000021
wherein, βnIs the nth order resonance mode coefficient, β1Is the 1 st order resonance mode coefficient, wherein βn＝(π/2)×(2n-1)；
Then, at the nth order resonance frequency fnExtracting the maximum value of the frequency signal as f within +/-100 HznA numerical value;
further, by fnNumerical calculation of the score CnAnd storing the numerical values in the form of a numerical sequence in a computer:
Figure BSA0000167638290000031
wherein f isr＝216.6Hz；
Further, the pairing of the two drumsticks with the highest coincidence degree of the score acquisition values can be realized by the following two ways:
the batch pairing method comprises the following steps:
1) extracting the pitch value C of two adjacent resonance frequency points of the same stage of each drum rodnAnd Cn+1As a matching reference value;
2) collecting a certain number of drum rods at one time, and collecting C of all the drum rods in the batchn±CerrGenerating a set and adding C in the setnTemporarily pairing the two drum rods with the highest value coincidence degree; wherein, CerrThe error range of the score value set by the user;
3) judging C of the paired drum sticksn+1±CerrIf the two are overlapped, determining the pairing; if not, the pairing is abandoned;
4) after the pairing algorithm is completed, the system gives the serial number, the score and the frequency information of the paired drumsticks.
(II) a cycle pairing mode:
1) collecting the score C of the resonance frequency point of the 1 st drum stick1Then, the data D is stored in the memory of the computer1；
2) Collecting the tone scale C of the resonance frequency point of the 2 nd drum stick2Then, C is judged2±CerrC with No. 1 drumstick1±CerrWhether the two are overlapped;
3) if C2±CerrAnd C1±CerrThe matching can be performed, and the system prompts that the matching is successful;
4) if C2±CerrAnd C1±CerrThe pitch value C of the resonance frequency point of the second drum rod is collected without overlapping2Stored in the memory of the computer as data D2；
5) Repeating the steps, and establishing an unpaired data set in the system as Ds；
6) Recording the new pitch value C of the nth drum rod resonance frequency pointnAfter the information, judging C one by onen±CerrAnd set DsWhether the data are overlapped or not is judged, if so, the system prompts that the pairing is successful and outputs pairing information; if the sound score values do not coincide with each other, the new sound score value C of the nth drum rod resonance frequency point is calculatednInformation joining set DsIn (1).
The invention has the following positive effects: according to the drumstick pairing method based on resonance spectrum recognition, audio frequency emitted by knocking of a single drumstick is collected and analyzed, a comparison database is established, the audio frequency information of the drumsticks is compared one by one, accurate pairing of the two drumsticks in a batch of drumsticks is finally achieved, the matched drumsticks are high in tone color conformity, and pursuit of percussion music enthusiasts for high quality of music is greatly improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic workflow diagram of the present invention.
Detailed Description
As shown in fig. 1, as a specific embodiment, the method for pairing a drumstick based on resonance spectrum identification mainly includes the following steps:
firstly, a computer pickup interface is turned on, the system starts to continuously pick up external audio signals through a non-contact acoustic sensor (Shure SM57), but the system does not record any audio signals;
secondly, knocking a single drum stick, capturing an audio signal emitted by the drum stick by a non-contact acoustic sensor, and triggering a recording system to record the audio signal 0.5 second later when the amplitude of the audio signal exceeds the amplitude of a background audio signal by 180%;
and thirdly, the non-contact acoustic sensor inputs the recorded audio signal into an analog-to-digital conversion card after gain, converts the audio signal into a digital signal at a sampling rate of 48/96khz, and transmits the digital signal to a computer.
Fourthly, performing fast Fourier transform on the recorded audio digital signal of the drumstick to obtain the frequency spectrum of the audio digital signal, and omitting low-frequency interference signals below 500 Hz;
fifthly, extracting the maximum frequency spectrum value point within the range of 800-1200Hz as the basic frequency point f of the vibration of the drum stick1For a single-side constrained vibrator, the resonance frequency f is determined according to the nth ordernAnd fundamental frequency point f1The relationship between the two is used for judging the position of the nth order resonance frequency point:
Figure BSA0000167638290000041
wherein, βnIs the nth order resonance mode coefficient, β1Is the 1 st order resonance mode coefficient, wherein βn(pi/2) × (2n-1), e.g.: β1＝1.875、β2＝4.699、β3＝7.854、……；
Sixth, at nth order resonance frequency fnExtracting the maximum value of the frequency signal as f within +/-100 HznA numerical value; will f isnNumerical value of and f1Are assigned to the same scale in each scale CnConversion of formula into minutes CnAnd storing the data in a computer memory in a number sequence form to finish the tone acquisition and recording of the resonance frequency point of a single drumstick:
Figure BSA0000167638290000051
wherein f isr＝216.6Hz。
Pairing two drums rods can be achieved in two ways:
the batch pairing method comprises the following steps:
1) extracting fundamental frequency point f of each drum stick1Score of C1And a second order resonance frequency point f2Score of C2As a matching reference value;
2) collecting a certain number of drum rods at one time, and collecting C of all the drum rods in the batch1±CerrGenerating a set and adding C in the set1Temporarily pairing the two drum rods with the highest value coincidence degree;
3) judging C of the paired drum sticks2±CerrIf so, determining the configurationCarrying out pairing; if not, the pairing is abandoned;
4) after the pairing algorithm is completed, the system gives the serial number, the score and the frequency information of the paired drumsticks.
(II) a cycle pairing mode:
1) collecting the score C of the resonance frequency point of the 1 st drum stick1Then, the data D is stored in the memory of the computer1；
2) Collecting the tone scale C of the resonance frequency point of the 2 nd drum stick2Then, C is judged2±CerrC with No. 1 drumstick1±CerrWhether the two are overlapped;
3) if C2±CerrAnd C1±CerrThe matching can be performed, and the system prompts that the matching is successful;
4) if C2±CerrAnd C1±CerrThe pitch value C of the resonance frequency point of the second drum rod is collected without overlapping2Stored in the memory of the computer as data D2；
5) Repeating the above steps, based on the data D of the stick where the proper matching object is not found temporarilynThe system will establish unpaired datasets as Ds；
6) Recording the new pitch value C of the ith drum rod resonance frequency pointiAfter the information, judging C one by onei±CerrAnd set DsWhether the data are overlapped or not is judged, if so, the system prompts that the pairing is successful and outputs pairing information; if the sound score values do not coincide with each other, the new sound score value C of the ith drum rod resonance frequency point is calculatediInformation joining set DsIn (1).
Through the two drum stick matching modes, two drum sticks with similar timbres can be successfully matched.
While the foregoing is directed to embodiments of the resonance spectrum identification-based drumstick pairing method, it will be appreciated by those skilled in the art that various changes may be made therein without departing from the spirit and scope of the invention, and that all changes and modifications that come within the spirit and scope of the invention are desired to be protected by the following claims.

Claims (7)

1. A drumstick pairing method based on resonance spectrum identification is characterized by comprising the following steps: the method comprises the following steps:
1) acquiring an audio signal generated by knocking a single drumstick, converting the audio signal into an audio digital signal and transmitting the audio digital signal to a computer;
2) performing fast Fourier transform on the audio digital signal to obtain the frequency spectrum of the audio digital signal, and omitting a low-frequency interference signal;
3) n-order resonance frequency point f of single drum rodnCollecting and recording the sound score;
4) and matching the two drumsticks with the highest coincidence degree of the score acquisition values.
2. The drumstick audio recognition pairing method of claim 1, wherein: the audio signal sent by the knocking of a single drum stick is obtained by continuously picking up an external audio signal through a non-contact acoustic sensor in communication connection with a computing mechanism, and when the amplitude of the obtained audio signal exceeds a preset value, a recording system is triggered and the audio signal with a fixed period is recorded.
3. The drumstick audio recognition pairing method of claim 1, wherein: the non-contact acoustic sensor inputs the recorded audio signal into an analog-to-digital conversion card after gain, converts the audio signal into a digital signal at a set sampling rate, and transmits the digital signal to a computer.
4. The drumstick audio recognition pairing method of claim 1, wherein: fundamental frequency point f of single drum resonance1For obtaining the maximum amplitude point of the frequency spectrum in a set range and then according to the nth order resonance frequency point fnAnd fundamental frequency point f1The relation between the two is used to judge the position of the nth order resonance frequency point,
Figure FSA0000167638280000011
wherein, βnIs the nth order resonance mode coefficient, β1Is the 1 st order resonance mode coefficient, wherein βn＝(π/2)×(2n-1)；
Then, at the nth order resonance frequency fnExtracting the maximum value of the frequency signal as f within +/-100 HznNumerical values.
5. The drumstick audio recognition pairing method of claim 4, wherein: through fnNumerically calculating the score value CnAnd the numerical values are stored in the computer in the form of numerical arrays,
Figure FSA0000167638280000021
wherein f isr＝216.6Hz。
6. The drumstick audio recognition pairing method of claim 5, wherein: the pairing of the two drumsticks with the highest coincidence degree of the score acquisition values can be realized by the following modes:
1) extracting the pitch value C of two adjacent resonance frequency points of the same stage of each drum rodnAnd Cn+1As a matching reference value;
2) collecting a certain number of drum rods at one time, and collecting C of all the drum rods in the batchn±CerrGenerating a set and adding C in the setnTemporarily pairing the two drum rods with the highest value coincidence degree;
3) judging C of the paired drum sticksn+1±CerrIf the two are overlapped, determining the pairing; if not, the pairing is abandoned;
after the pairing algorithm is completed, the system gives the serial number, the score and the frequency information of the paired drumsticks.
7. The drumstick audio recognition pairing method of claim 1, wherein: the pairing of the two drumsticks with the highest coincidence degree of the score acquisition values can be realized by the following modes:
1) collecting the score C of the resonance frequency point of the 1 st drum stick1Then, the data D is stored in the memory of the computer1；
2) Collecting the tone scale C of the resonance frequency point of the 2 nd drum stick2Then, C is judged2±CerrC with No. 1 drumstick1±CerrWhether the two are overlapped;
3) if C2±CerrAnd C1±CerrThe matching can be performed, and the system prompts that the matching is successful;
4) if C2±CerrAnd C1±CerrThe pitch value C of the resonance frequency point of the second drum rod is collected without overlapping2Stored in the memory of the computer as data D2；
5) Repeating the steps, and establishing an unpaired data set in the system as Ds；
6) Recording the new pitch value C of the nth drum rod resonance frequency pointnAfter the information, judging C one by onen±CerrAnd set DsWhether the data are overlapped or not is judged, if so, the system prompts that the pairing is successful and outputs pairing information; if the sound score values do not coincide with each other, the new sound score value C of the nth drum rod resonance frequency point is calculatednInformation joining set DsIn (1).
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112911767A (en) * 2021-01-29 2021-06-04 深圳市凯润智能照明有限公司 Audio-based light control system and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300438A (en) * 1980-08-29 1981-11-17 Handal Richard A Resinous drumstick
US20060283233A1 (en) * 2003-06-24 2006-12-21 Andrew Cordani Resonance and/or vibration measurement device
WO2010031135A1 (en) * 2008-09-18 2010-03-25 William White A reinforced drumstick
US20110162511A1 (en) * 2009-08-24 2011-07-07 Richard Gary P Kinetic energy enhanced drumstick
US20130025433A1 (en) * 2011-07-29 2013-01-31 Gatti Robert P Cradle for holding two drumsticks together
US20140102284A1 (en) * 2012-10-16 2014-04-17 Alexander RAMIREZ Device for the retention of matched sets of drumsticks
CN208357262U (en) * 2018-04-27 2019-01-11 漳州汉旗乐器有限公司 A kind of automatic weighing sorting device of bulging stick

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300438A (en) * 1980-08-29 1981-11-17 Handal Richard A Resinous drumstick
US20060283233A1 (en) * 2003-06-24 2006-12-21 Andrew Cordani Resonance and/or vibration measurement device
WO2010031135A1 (en) * 2008-09-18 2010-03-25 William White A reinforced drumstick
US20110162511A1 (en) * 2009-08-24 2011-07-07 Richard Gary P Kinetic energy enhanced drumstick
US20130025433A1 (en) * 2011-07-29 2013-01-31 Gatti Robert P Cradle for holding two drumsticks together
US20140102284A1 (en) * 2012-10-16 2014-04-17 Alexander RAMIREZ Device for the retention of matched sets of drumsticks
CN208357262U (en) * 2018-04-27 2019-01-11 漳州汉旗乐器有限公司 A kind of automatic weighing sorting device of bulging stick

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112911767A (en) * 2021-01-29 2021-06-04 深圳市凯润智能照明有限公司 Audio-based light control system and method

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