Wind Instrument Resonant Chamber Sensing for Real-Time Note ID
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Solution Overview
Problem
Existing note identification methods for musical instruments, particularly larger reed woodwind instruments, face challenges due to lower acoustic wavelengths and acoustic interference, making them unsuitable for performance purposes.
Innovation Solution
A system using a transmitted electromagnetic signal to determine the configuration of a resonant chamber in a musical instrument from a sensed reflected wave, providing real-time note identification with immunity to acoustic interference for instruments with electrically conductive surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic signals are used for note identification in larger reed woodwind instruments, then the system can identify notes, but the lower acoustic wavelengths require stimulation at lower frequencies and longer analysis frames, reducing real-time performance
Solution Approach 1:
The patent replaces the acoustic measurement system with an electromagnetic measurement system. Instead of using microphones to detect acoustic waves and analyze them in time-domain frames, the system uses electromagnetic signals to probe the resonant chamber and extract note information from the reflected electromagnetic waves. This substitution eliminates the need for long acoustic analysis frames while maintaining measurement precision.
Solution Approach 2:
The patent changes the physical parameter domain from acoustic frequency to electromagnetic frequency. By operating at electromagnetic frequencies (microwave range), the system achieves much higher resolution and faster response times compared to acoustic frequencies. The electromagnetic wavelength is much shorter than acoustic wavelength, enabling precise measurement without requiring long observation frames.
2Measurement precision
If acoustic signals are used for note identification, then the system can determine note configuration, but the method is not immune to acoustic interference, making it unsuitable for performance purposes
Solution Approach 1:
The patent replaces the acoustic field with an electromagnetic field for measurement purposes. Electromagnetic waves operate independently of acoustic interference, allowing the system to detect note configurations accurately even in noisy acoustic environments such as live performances. The electromagnetic probe signal reflects off the resonant chamber configuration and returns information about the current note being played, unaffected by external acoustic disturbances.
3Reliability
If electromagnetic signals are used for note identification, then the system achieves immunity to acoustic interference and real-time performance, but the instrument surface must be electrically conductive, limiting applicability
Solution Approach 1:
The patent changes the surface property parameter from acoustic reflection to electrical conductivity. By requiring an electrically conductive surface, the system enables electromagnetic signal interaction with the instrument. For instruments without naturally conductive surfaces, a conductive coating can be applied, or a conductive component (such as a metal plate or wire) can be attached to the resonant chamber to provide the necessary electromagnetic interaction interface.
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
The system enables real-time, accurate note identification for a wide range of musical instruments, including those with conical and cylindrical bore profiles, while completely eliminating acoustic interference, making it suitable for performance environments.
Implementation Method 1
transmitted electromagnetic signal to determine a configuration of a resonant chamber in the musical instrument from a sensed reflected wave
Data Source
AI summary
A system and method is disclosed for identification of a musical note played by a musical wind instrument with a resonant chamber having a plurality of configurations selectable by a player of the musical wind instrument and an electrically conductive surface in the resonant chamber. The system and method include a stimulation signal generator for generating a stimulation signal and antenna means mountable on the musical instrument for broadcasting the stimulation signal as an electromagnetic signal within the resonant chamber and for receiving a reflected electromagnetic signal from the resonant chamber The system and method also include an electronic processing unit for processing the reflected electromagnetic signal and determining therefrom a configuration of the resonant chamber selected by the player and indicative of a musical note that is or would be output by the instrument when played at the time of the received reflected signal.