TWI805145B - Automatic accompaniment system for percussion instruments - Google Patents

Abstract

An automatic accompaniment system for percussion musical instruments includes a sound wave receiving element, an audio processing module and an automatic percussion device. The sound wave receiving element is used for receiving a musical instrument performance sound wave, and converting the musical instrument performance sound wave into a musical instrument performance audio signal. The audio processing module is used to analyze the beat information from the musical instrument performance. The automatic percussion device includes a control module and a percussion module. The control module is communicatively connected to the audio processing module for generating a tap control signal according to the beat information. The percussion module includes a percussion assembly and a driving assembly. The percussion assembly is arranged on a percussion path passing through the percussion instrument. The driving assembly is electrically connected to the control module for receiving the percussion control signal, and accordingly drives the percussion element to alternately strike and move away from the percussion instrument along the percussion path.

Description

Automatic accompaniment system for percussion instruments

The present invention relates to an automatic accompaniment system, in particular to an automatic accompaniment system for percussion musical instruments.

Generally speaking, in the orchestra performances that everyone is familiar with, people from different musical instrument fields usually play various instruments, such as jazz drums, guitars or BASS, etc. Sometimes some problems are prone to occur. For example, it is necessary to arrange a time in advance or exclude some external factors to get together for practice. When some people cannot overcome all difficulties, they cannot practice or rehearse.

Continuing from the above, when learning music for the first time, most music teachers will first use hand clapping to capture the beat of the music as the first step in understanding music, and the beat plays a very important role in the presentation of a piece of music . During the music ensemble, if the speed of the music is fast or slow, it is easy to seriously affect the performance of the song, so when learning music, usually the teacher will first ask everyone to have an accurate rhythm, and at the same time they will use a metronome to assist practise.

From the above description, we can see that the rhythm of music is very important to the performance of music. During group practice or rehearsal, you can use the rhythm of other people to play music to correct your own rhythm. Strong, otherwise it is easy to let the rhythm of the performance run away, and then it is impossible to practice effectively.

In view of the fact that in the prior art, most of the existing musical instrument performance exercises are carried out by many people at the same time, so it is relatively easy to grasp the rhythm, but the disadvantage is that multiple people are required to play at the same time. Therefore, it is very likely that the rhythm of the performance will run away without knowing it; therefore, the main purpose of the present invention is to provide an automatic accompaniment system for percussion-type musical instruments, which can be based on the user's performance when playing the musical instrument. Beat the percussion instrument with the beat to achieve the effect of accompaniment.

In order to solve the problems of the prior art, the necessary technical means adopted by the present invention is to provide an automatic accompaniment system for a percussion-type musical instrument, which is based on a musical instrument playing sound waves and percussing a percussion-type musical instrument for accompaniment, including sound wave receiving elements, An audio processing module and an automatic percussion device.

The sound wave receiving element is used for receiving the sound wave of the performance of the musical instrument, and converting the sound wave of the performance of the musical instrument into an audio signal of the performance of the musical instrument. The audio processing module is electrically connected to the sound wave receiving element, and is used to analyze a beat information from the performance audio of the musical instrument.

The automatic knocking device includes a control module and a knocking module. The control module is communicatively connected with the audio processing module to receive beat information and generate a tapping control signal according to the beat information.

The percussion module includes a percussion component and a driving component. The percussion component is arranged on a percussion path passing through the percussion instrument. The driving component is electrically connected to the control module to receive the percussion control signal, so as to drive the percussion component to alternately strike and move away from the percussion instrument along the percussion path.

In one of the auxiliary technical means derived from the above-mentioned necessary technical means, the audio processing module uses wavelet functions (Wavelet Functions) to perform wavelet transform on the musical instrument performance audio to calculate the tempo information. Preferably, the wavelet function is a Daubechies Wavelet.

In an auxiliary technical means derived from the above necessary technical means, the control module further includes a transmission element and a management element. The transmission element is communicatively connected to the audio processing module for receiving beat information and sending out the beat information. The management element is communicatively connected to the transmission element for receiving beat information and generating a tapping control signal according to the beat information.

In an auxiliary technical means derived from the above necessary technical means, the percussion module further includes a bracket for fixing the percussion component and the driving component, and the bracket is fixed on one percussion side of the percussion instrument.

Preferably, the driving assembly further includes a motor, a pushing element and a sensing element. The motor is fixed on the bracket and electrically connected to the control module. The pushing element is connected with the motor and driven by the motor to move along a circulation path, and the circulation path includes an idle stroke and a push stroke. The sensing element is arranged on the circulation path and electrically connected to the control module to sense the push element, and when the push element is sensed, a trigger signal is sent to the control module, so that the control module follows the trigger signal A single-turn rotation time is calculated, and then the control module generates a tapping control signal at a tapping frequency according to the beat information and the single-turn rotation time.

In addition, the knocking assembly further includes a linkage rod, a knocking rod and an elastic element. The linkage rod system has a pivoting end and a free end which are oppositely arranged. The pivoting end is pivotally connected to the bracket. The end system moves from a first position to a second position along a swing path, and disengages from the pushing element at the second position.

The percussion rod is arranged between the pivotal end and the free end, and is used to contact the percussion instrument when the free end is at the first position, and gradually move away from it when the free end moves from the first position to the second position. percussion instrument.

The elastic element is connected to the bracket and the linkage rod, and is used to produce an elastic restoring force when the free end moves along the swing path, and utilizes the elastic restoring force when the free end moves to the second position and separates from the pushing element. The linkage rod is reversely oscillated along the oscillating path to drive the percussion rod to strike the percussion-type instrument.

In an auxiliary technical means derived from the above necessary technical means, the sensing element further includes a light emitting plate, a light receiving plate and a light shielding plate. The light emitting board is fixed on the bracket. The light-receiving board is fixed on the bracket, and is spaced apart from the light-emitting board. The light-shielding plate is fixed on the pushing element and is used for correspondingly passing between the light-emitting plate and the light-receiving plate when the pushing element moves along the circulation path, so as to make the light-receiving plate generate a trigger signal.

As mentioned above, the present invention mainly uses the sound wave receiving element to receive the sound wave of musical instruments, then uses the audio processing module to analyze the beat information, and then controls the percussion module to hit the percussion instrument according to the beat information, so it can effectively accompany The percussion-type musical instrument is automatically hit with the sound wave of the musical instrument to generate the percussion sound corresponding to the beat information. By this, even if the user only has one person playing the musical instrument, the automatic accompaniment system of the percussion-type musical instrument of the present invention can provide The user's automatic accompaniment effectively allows the user to perform precise musical instrument performance exercises alone.

The specific embodiments adopted by the present invention will be further described by the following embodiments and drawings.

Please refer to the first figure to the fifth figure, the first figure shows the schematic diagram of the automatic accompaniment system of the percussion instrument provided by the preferred embodiment of the present invention; the second figure shows the percussion instrument provided by the preferred embodiment of the present invention. The system block diagram of the automatic accompaniment system of the percussion instrument; the third figure is a perspective view showing the automatic percussion device of the automatic accompaniment system of the percussion instrument provided by the preferred embodiment of the present invention; the fourth A figure is a display of this A schematic plan view of the automatic percussion device of the automatic accompaniment system of the percussion-type musical instrument provided by the preferred embodiment of the invention; the fourth B figure is an enlarged schematic diagram of the circle A in the fourth A figure; the fifth figure shows the preferred implementation of the present invention A schematic plan view of another perspective of the automatic percussion device of the automatic accompaniment system of the percussion instrument provided by the example.

As shown in FIGS. 1 to 5 , an automatic accompaniment system 100 for a percussion instrument includes a sound wave receiving element 1 , an audio processing module 2 and an automatic percussion device 3 . Wherein, the automatic accompaniment system 100 of the percussion type musical instrument of this creation is to strike a percussion type musical instrument PC for accompaniment according to a musical instrument performance sound wave MS produced by a musical instrument MI, and in this embodiment, the musical instrument MI is a guitar, and the percussion-type musical instrument PC is a bass drum of a jazz drum, but it is not limited thereto in other embodiments.

The sound wave receiving element 1 is used for receiving a musical instrument performance sound wave MS, and converting the musical instrument performance sound wave MS into a musical instrument performance audio signal S1. In this embodiment, the sound wave receiving element 1 is a microphone.

The audio processing module 2 is electrically connected to the sound wave receiving element 1 for analyzing a beat information BI from the musical instrument performance audio S1. In this embodiment, the audio processing module 2 is a computer host, and the audio processing module 2 uses wavelet functions to perform wavelet transform on the musical instrument performance audio to calculate the beat information BI. Wherein, the wavelet function used in this embodiment is a Daubechies Wavelet.

In practice, since the main structure of music is composed of melody, harmony and rhythm, and rhythm is the speed of the song, also known as beat, generally defined as how many beats per minute, that is, BPM (Best Per Minute); among them , Most of the songs can be divided into broad board (40-60BPM), small slow board (60-66BPM), adagio (66-76BPM), andante (76-108BPM), medium board (108-120BPM) according to the music speed , Allegro (120-168BPM), Presto (168-200BPM) and Presto (above 200BPM).

The automatic tapping device 3 includes a control module 31 and a tapping module 32 . The control module 31 further includes a transmission element 311 and a management element 312 . The transmission element 311 is communicatively connected to the audio processing module 2 for receiving the beat information BI and sending out the beat information BI. The management component 312 is communicatively connected to the transmission component 311 for receiving beat information BI and generating a tapping control signal S2 according to the beat information BI.

The knocking module 32 includes a bracket 321 , a knocking component 322 and a driving component 323 . The bracket 321 is fixedly arranged on one percussion side of the percussion instrument PC (not shown), and the bracket 321 includes a base 3211, a pillar 3212, an elastic element setting frame 3213, a motor fixing seat 3214 and a Sensor mounting rack 3215.

The base 3211 is disposed on the side of the percussion instrument PC, and the pillar 3212 is fixed on the base 3211 and extends upward from the base 3211 . The elastic component mounting frame 3213 is fixed on one side of the pillar 3212 adjacent to the percussion instrument PC. The motor fixing base 3214 is fixed on the top of the pillar 3212 . The sensor installation frame 3215 is fixed on the motor fixing base 3214 . Among them, the base 3211, the pillar 3212, the elastic element installation frame 3213, the motor fixing seat 3214, and the sensor installation frame 3215 in this embodiment can be locked by screws, but not limited thereto, and can also be locked by welding. etc. for fastening.

The knocking assembly 322 includes a linkage rod 3221 , a knocking rod 3222 and an elastic element 3223 . The linkage rod 3221 has a pivot end 32211 and a free end 32212 oppositely disposed. The pivot end 32211 is pivotally connected to the end of the pillar 3212 adjacent to the base 3211 .

The percussion rod 3222 is fixedly connected to the linkage rod 3221, and is located between the pivotal end 32211 and the free end 32212, and the percussion rod 3222 is arranged on a percussion path (not shown) passing through the percussion instrument PC. Wherein, the end of the percussion stick 3222 adjacent to the percussion instrument PC is a drumstick head covered with soft or elastic material in this embodiment. The elastic element 3223 is connected to the bracket 321 and the linkage rod 3221, and is used for deforming when the free end 32212 is away from the percussion instrument PC to generate an elastic restoring force.

The driving assembly 323 includes a motor driver 3231 , a motor 3232 , a pushing element 3233 and a sensing element 3234 . The motor driver 3231 is electrically connected to the management element 312 of the control module 31 for receiving the tapping control signal S2. The motor 3232 is embedded and fixed on the motor fixing seat 3214, and is electrically connected to the motor driver 3231, so as to be electrically connected to the control module 31 through the motor driver 3231, and the motor 3232 is also provided with a turntable 32321; wherein, The turntable 32321 is connected to the rotating shaft of the motor 3232, and the motor driver 3231 drives the motor 3232 to drive the turntable 32321 to rotate according to the knocking control signal S2.

The pushing element 3233 is connected to the turntable 32321 of the motor 3232, so as to be driven by the motor 3232 to move along a circular path (not shown in the figure, which is equivalent to the combination of the pushing stroke PP in the fifth figure and the idling stroke IP in the sixth figure), The cycle path includes an idle stroke IP (marked in the sixth figure) and a push stroke PP (marked in the fifth figure). The pushing element 3233 is a column structure in this embodiment.

The sensing element 3234 is arranged on the circulation path and is electrically connected to the management element 312 of the control module 31 to sense the push element 3233 and send a trigger signal S3 to the management element when the push element 3233 is sensed 312, so that the management component 312 calculates a single-turn rotation time according to the trigger signal S3, and then generates a tapping control signal S2 with a tapping frequency according to the beat information BI and the single-turn rotation time.

In this embodiment, the sensing element 3234 includes a light-emitting plate 32341, a light-receiving plate 32342, and a light-shielding plate 32343. The light-emitting plate 32341 and the light-receiving plate 32342 are spaced apart from each other and fixed on the sensor device. frame 3215, and the shading plate 32343 is fixed on the pushing element 3233, and when the pushing element 3233 is driven by the turntable 32321 and moves along the circulation path, the shading plate 32343 passes between the light emitting plate 32341 and the light receiving plate 32342 correspondingly , and when the light-shielding plate 32343 passes between the light-emitting plate 32341 and the light-receiving plate 32342, the light-shielding plate 32343 will block the light emitted by the light-emitting plate 32341, and then the light-receiving plate 32342 will stop receiving light to generate a trigger The signal S3 is sent to the management element 312 .

In addition, the management component 312 can also calculate whether the actual tapping frequency of the percussion stick 3222 conforms to the beat of the beat information BI through the time of receiving multiple trigger signals S3, and then correct the rotation speed of the motor 3232 so that the percussion stick 3222 can strike The beat is more accurate when playing percussion instruments PC.

It should be noted that, in practice, the transmission element 311 is, for example, a Raspberry Pi (Raspberry Pi) miniature single-board computer, and the management element 312 is, for example, an Arduino UNO microcontroller development board, so that the audio processing module Group 2 (computer host) can serve as a communication bridge between the sensing element 3234 and the motor driver 3231 through the transmission element 311 and the management element 312 . In addition, in this embodiment, the communication between the audio processing module 2 , the transmission component 311 and the management component 312 is based on a Robot Operating System.

Please continue to refer to the sixth figure. The sixth figure is a schematic plan view of the connecting rod in the fifth figure being pushed by the pushing element and moving away from the musical instrument. As shown in Figures 1 to 6, the automatic accompaniment system 100 for percussion musical instruments of this embodiment first uses the sound wave receiving element 1 to receive the musical instrument performance sound waves MS generated by the user playing the musical instrument MI. Then send the musical instrument performance audio S1 to the audio processing module 2 according to the musical instrument performance sound wave MS, and the audio processing module 2 will analyze the beat information BI from the musical instrument performance audio S1, and then the control module 31 controls the driving component according to the beat information BI 323 drives the percussion assembly 322 to strike the percussion instrument PC.

Based on the above, in more detail, the motor driver 3231 will drive the motor 3232 through the turntable 32321 to drive the pushing element 3233 to rotate along the circulation path according to the knocking control signal S2. Since the free end 32212 is located on the circulation path, when pushing When the element 3233 moves to the push stroke PP, it will first push against the free end 32212, and when the push element 3233 moves along the push stroke PP and switches the idling stroke IP, the free end 32212 will be pushed against from the first position (such as the fifth The position of the linkage rod 3221 shown in the figure) moves to the second position (as the position of the linkage rod 3221a shown in the sixth figure) along the swing path (not shown), at this time the knocking rod 3222 will be pushed by the pushing element 3233 When the free end 32212 moves from the first position to the second position, it gradually moves away from the percussion instrument PC, and then when the pushing element 3233 enters the idling stroke IP, the free end 32212 will break away from the pushing element at the second position 3233, and then use the elastic restoring force generated by the elastic element 3223 driven by the pushing element 3233 to make the linkage rod 3221 reversely swing along the swing path to drive the percussion rod 3222 to hit the percussion instrument PC.

In addition, the management component 312 can judge whether the percussion frequency of the percussion instrument PC by the percussion stick 3222 conforms to the beat information BI by the per-rotation time of the push component 3233 sensed by the sensing component 3234, for example, when the audio When the beat information BI analyzed by the processing module 2 is 100BPM (beats per minute), the management element 312 will judge whether the rotation speed of the motor 3232 is 0.6 seconds through the sensing element 3234 to detect whether the driving element 3233 rotates for 0.6 seconds or not. raise or lower.

To sum up, since the present invention uses the sound wave receiving element to receive the sound waves played by musical instruments, then uses the audio processing module to analyze the beat information, and then controls the percussion module to hit the percussion instrument according to the beat information, so it can effectively Accompanied by the musical instrument playing sound waves, the percussion instrument is automatically struck to generate the percussion sound corresponding to the beat information. Thus, even if only one user is playing the instrument, the automatic accompaniment system of the percussion instrument of the present invention can Automatic accompaniment for the user, effectively allowing the user to perform precise musical instrument performance exercises alone.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the claimed patent scope of the present invention.

100: Automatic accompaniment system for percussion instruments 1: Acoustic wave receiving element 2: Audio processing module 3: Automatic knocking device 31: Control module 311: transmission element 312: Manage components 32: Percussion module 321: Bracket 3211: base 3212: pillar 3213: elastic element setting frame 3214:Motor mount 3215: Sensor Setting Rack 322: Percussion components 3221,3221a: linkage rod 32211: Pivot end 32212: free end 3222: Percussion stick 3223: elastic element 323: Drive components 3231: motor driver 3232: motor 32321: turntable 3233: push element 3234: sensing element 32341: light emitting board 32342: Light receiving board 32343: visor MI: musical instrument MS: Instrumental Performance Sonic PC: percussion instrument S1: Instrument performance audio S2: Knock control signal S3: trigger signal BI: Beat Information IP: idling stroke PP: push stroke

The first figure shows the schematic diagram of the automatic accompaniment system of the percussion instrument provided by the preferred embodiment of the present invention; The second figure shows the system block diagram of the automatic accompaniment system of the percussion type musical instrument provided by the preferred embodiment of the present invention; The third figure is a perspective view showing the automatic percussion device of the automatic accompaniment system of the percussion instrument provided by the preferred embodiment of the present invention; The 4th A figure shows the plan view of the automatic percussion device of the automatic accompaniment system of the percussion type musical instrument provided by the preferred embodiment of the present invention; The fourth picture B is an enlarged schematic diagram of circle A in the fourth picture A; The fifth figure is a schematic plan view showing another perspective of the automatic percussion device of the automatic accompaniment system of the percussion instrument provided by the preferred embodiment of the present invention; and Figure 6 is a schematic plan view of the connecting rod in Figure 5 being pushed by the pushing element to move away from the musical instrument.

100: Automatic accompaniment system for percussion instruments

1: Acoustic wave receiving element

2: Audio processing module

3: Automatic knocking device

31: Control module

32: Percussion module

MI: musical instrument

MS: Instrumental Performance Sonic

PC: percussion instrument

S1: Instrument performance audio

BI: Beat Information

Claims (6)

An automatic accompaniment system for a percussion musical instrument, which is based on the sound wave of a musical instrument to strike a percussion musical instrument for accompaniment, including: a sound wave receiving element, which is used to receive the sound wave of the musical instrument and convert the sound wave Playing audio for a musical instrument; an audio processing module, which is electrically connected to the sound wave receiving element, and is used to analyze a beat information from the playing audio of the musical instrument; and an automatic percussion device, including; a control module, which is The communication link is connected to the audio processing module, which is used to receive the beat information and generate a percussion control signal according to the beat information; and a percussion module, including: a bracket, which is fixed on one of the percussion instruments The percussion side; a percussion component is fixed on the bracket and arranged on a percussion path passing through the percussion instrument; and a driving component includes: a motor, which is fixed on the bracket and electrically connected The control module is used to receive the percussion control signal, so as to drive the percussion component to alternately percussion and away from the percussion instrument along the percussion path; a pushing element is connected to the motor, and driven by the motor to move along a circulation path, and the circulation path includes an idle stroke and a push stroke; and a sensing element is arranged on the circulation path and electrically connected to the control module for to sense the push element, and in the sense When the push element is detected, a trigger signal is sent to the control module, so that the control module calculates a single-turn rotation time according to the trigger signal, and then the control module calculates a single-turn rotation time according to the beat information and the single-turn rotation time The tapping control signal is generated at a tapping frequency. The automatic accompaniment system for percussion-type musical instruments as described in Claim 1, wherein the audio processing module uses wavelet functions (Wavelet Functions) to perform wavelet transform on the performance audio of the musical instrument, so as to calculate the beat Information. The automatic accompaniment system for a percussion instrument according to Claim 2, wherein the wavelet function is a Daubechies Wavelet. The automatic accompaniment system for percussion-type musical instruments as described in Claim 1, wherein the control module further includes: a transmission element, which is communicatively connected to the audio processing module, to receive the tempo information and convert the tempo The information is sent out; and a controller is communicatively connected to the transmission element for receiving the tempo information and generating the tapping control signal according to the tempo information. The automatic accompaniment system for percussion-type musical instruments as described in Claim 1, wherein the percussion component further includes: a linkage rod with a pivot end and a free end oppositely arranged, the The pivoting end is pivotally connected to the bracket, the free end is located on the circulation path, and when the pushing element moves to the pushing stroke, it pushes against the free end, so that the free end moves from a first position along a The swinging path moves to a second position and disengages from the push member at the second position; a knock rod is arranged between the pivotal end and the free end for being located at the first position at the free end contact with the percussion instrument when the free end moves from the first position to the second position; and an elastic element is connected to the bracket and the linkage rod , used to generate deformation during the movement of the free end along the swing path to generate an elastic restoring force, and when the free end moves to the second position and breaks away from the pushing element, the linkage is made use of the elastic restoring force The rod reversely swings along the swing path to drive the percussion stick to strike the percussion-type musical instrument. The automatic accompaniment system for percussion-type musical instruments as described in Claim 1, wherein the sensing element further includes: a light emitting board fixed on the bracket; a light receiving board fixed on the bracket and connected to the bracket The light-emitting plates are arranged at intervals; and a light-shielding plate is fixed on the pushing element and used to pass between the light-emitting plate and the light-receiving plate correspondingly when the pushing element moves along the circulation path, so that the light-shielding plate The light receiving board generates the trigger signal.

Images