Electronic Drum Sensor Threshold Adjustment for Rebound Noise
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Solution Overview
Problem
Electronic percussion instruments generate unintended sounds due to object rebounds on struck heads, as vibrations from one struck head can cause a hand or object to rebound on another, leading to unwanted sound production.
Innovation Solution
A sound source control information generating apparatus that uses sensors to detect striking and object placement on multiple struck heads, adjusting threshold values based on sensor output to differentiate intended and unintended vibrations, thereby preventing unintended sound generation by varying the sound generation process accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hand is placed on one struck head and another struck head is struck, then vibration is transmitted causing the hand to rebound on the first struck head, but this generates unintended sounds
Solution Approach 1:
The system performs preliminary detection of object placement on struck heads before actual striking occurs. By monitoring sensor outputs in advance and identifying when an object (hand) is placed on a struck head, the system prepares to suppress rebound vibrations that would cause unintended sounds, thereby preventing the harmful effect before it occurs
Solution Approach 2:
The system continuously monitors sensor outputs from multiple struck heads and uses this feedback to determine whether an object is placed on a struck head. Based on this feedback, the system dynamically adjusts the threshold values for detecting striking, allowing it to distinguish between intentional striking and rebound vibrations, thereby preventing unintended sound generation
2Productivity
If threshold values are used to detect striking, then sound generation is controlled, but rebound vibrations from placed objects can trigger unintended sound generation
Solution Approach 1:
The system dynamically adjusts threshold values based on the detection state of object placement on struck heads. When an object is detected to be placed on a struck head, the system changes the threshold value used for detecting striking on that head, allowing the same sensor system to adapt its sensitivity in real-time and prevent false triggering of sound generation during rebound phases
Solution Approach 2:
The system changes the parameter (threshold value) for striking detection based on the operational state (object placement detection). By modifying the threshold parameter according to whether an object is placed on the struck head, the system can differentiate between intentional striking events and unwanted rebound vibrations, improving sound generation accuracy without sacrificing productivity
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
Effectively prevents unintended sound production by accurately distinguishing between intended and unintended vibrations, ensuring that only desired sounds are generated, thus enhancing the playing experience by minimizing noise from object rebounds.
Implementation Method 1
a pressure sensor disposed on a back side of each struck head
Implementation Method 2
a piezoelectric sensor disposed on a back side of a case
Data Source
AI summary
A sound source control information generating apparatus, an electronic percussion instrument, and a sound source control information generating method, adapted for preventing generation of an unintended sound caused by a rebound of an object placed on one struck head, are provided. According to the present invention, if a first output value with respect to one struck head is obtained, the one struck head serves as a target struck head, and information is generated for controlling a sound source means such that a sound generation process performed by the sound source means differs according to whether the first output value obtained with respect to the target struck head or a value corresponding to the first output value is greater than a predetermined threshold value.