Percussion Sensor Segmentation for Slapping Technique Detection
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Solution Overview
Problem
Electronic percussion instruments cannot distinguish between the slapping technique, which uses the inertia of the housing to strike the struck head, and normal striking, due to the inability to differentiate the striking patterns detected by existing sensors.
Innovation Solution
A sound source control information generating apparatus that uses a first sensor to detect striking on the housing and a second sensor to detect striking on the struck head, with stored output values determining whether the housing is struck within a predetermined time interval, allowing for distinct musical sound control based on the playing technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor and piezoelectric sensor are used to detect striking on the struck head and housing, then the striking detection function is achieved, but the ability to distinguish slapping technique from normal striking is lost
Solution Approach 1:
The sensor system is segmented into two independent sensors: a first sensor (piezoelectric sensor) mounted on the housing to detect housing striking, and a second sensor (pressure sensor) mounted on the struck head to detect head striking. This segmentation allows independent detection of housing vibration and head impact, enabling distinction between slapping technique (housing struck first) and normal striking (head struck directly).
Solution Approach 2:
The first sensor detects housing striking in advance before the second sensor detects struck head striking. By recording the timing of housing vibration and comparing it with subsequent head striking timing, the system can identify slapping technique where the housing is struck preliminarily and the head follows within a predetermined time interval.
2Device complexity
If only a pressure sensor on the struck head is used, then the device structure is simple, but the slapping technique cannot be distinguished from normal striking
Solution Approach 1:
The detection function is segmented between two sensors with different locations and functions: the first sensor on the housing detects housing vibration from slapping motion, while the second sensor on the struck head detects the actual strike. This segmentation enables technique differentiation without excessive complexity.
Solution Approach 2:
The first sensor acts as an intermediary that detects the intermediate state (housing vibration) between the player's hand and the struck head. This intermediary detection provides critical information about slapping technique that would otherwise be invisible to a head-mounted sensor alone.
3Adaptability or versatility
If the housing vibration is detected and used to control musical sound, then the slapping technique can be performed, but the device complexity increases
Solution Approach 1:
The control system performs preliminary detection and timing comparison between housing vibration and struck head striking. By establishing a predetermined time interval threshold, the system automatically identifies slapping technique and selects appropriate musical sound parameters without complex real-time analysis.
Solution Approach 2:
The system uses feedback from the first sensor to adjust musical sound parameters. When housing vibration is detected within the predetermined time interval before struck head striking, the system feeds back control information to generate different musical sounds, enabling slapping technique expression.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the electronic device to generate different musical sounds for slapping and normal striking techniques, effectively allowing the slapping technique to be performed by distinguishing the striking patterns and adjusting tone or volume accordingly.
Implementation Method 1
a piezoelectric sensor, disposed on the back side of a case (housing), to detect the striking and the struck point when the struck head is struck
Data Source
AI summary
Provided is a sound source control information generating apparatus, adapted for performing slapping techniques. According to the present invention, information based on an output value of a first sensor that detects striking on the housing is stored in a memory means. If striking on the struck head of a percussion instrument is detected based on an output value of a second sensor that detects striking on the struck head, whether an output value equal to or greater than a predetermined value is obtained from the first sensor in a predetermined time interval before a timing of detecting the striking on the struck head is determined based on the information stored in the memory means.