Drum Head Sensor Placement for Native Sound Detection
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Solution Overview
Problem
Existing drum heads cannot output a signal representing the native sound produced by a drum, as the pulse signals generated are not indicative of the drum's vibration waveform, making it impossible to obtain the actual sound produced by the drum.
Innovation Solution
A drum head design featuring a sensor placed between two films, where the sensor is not secured to either film, allowing it to detect the vibration of the drum head without interfering with its natural vibration, thereby outputting a signal that represents the native sound produced by the drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is secured to the drum head films, then the sensor is firmly fixed and stable, but the sensor interferes with the natural vibration of the drum head, preventing accurate detection of native sound
Solution Approach 1:
The patent introduces a release paper as an intermediary between the sensor and the drum head films. The release paper allows the sensor to be temporarily held in position during assembly while permitting the drum head films to vibrate naturally against the sensor surface without direct bonding, thus resolving the contradiction between fixation stability and vibration detection accuracy
Solution Approach 2:
The patent employs thin film structures for both the drum head (first and second films) and the release paper. These flexible thin films allow the drum head to vibrate freely while maintaining close contact with the sensor, enabling accurate vibration detection without the need for rigid bonding that would interfere with natural vibration
2Measurement precision
If a force sensing register is disposed on the entire drum head to detect strike timing, then the timing detection is accurate, but the output signal does not represent the actual vibration waveform of the drum head
Solution Approach 1:
The patent replaces the force sensing register (electrical resistance-based detection) with a piezoelectric sensor that directly converts mechanical vibration into electrical signals. This substitution enables the sensor to capture the actual vibration waveform of the drum head while maintaining accurate strike timing detection, thus preserving the vibration waveform information that was lost in the force sensing register approach
Solution Approach 2:
The patent changes the detection parameter from resistance value changes (in force sensing register) to piezoelectric charge generation (in piezoelectric sensor). This parameter change allows the system to output signals that represent the actual vibration waveform of the drum head while maintaining the ability to detect strike timing accurately
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
This configuration enables the drum head to produce a signal that accurately represents the native sound of the drum, maintaining the tone color of the sound produced by a common drum and allowing for the conversion of the signal into audible sound, similar to an electric acoustic musical instrument.
Implementation Method 1
the sensor is a piezoelectric sensor including a piezoelectric element
Data Source
AI summary
A drum head includes: a first film including a striking surface; a second film disposed opposed to a back surface of the first film which is back from the striking surface; and a sensor disposed between the first film and the second film and configured to output a signal related to vibration. The sensor includes: a first contact surface configured to contact the back surface of the first film without being secured to the back surface; and a second contact surface configured to contact a front surface of the second film without being secured to the front surface. A sensor tail of the sensor is secured to at least one of the first film and the second film located outside the shell when the first film and the second film are stretched over an open end of a shell.