Optical electric guitar transducer and midi guitar controller
OwnerNathan Hilbish, Afroditi Vennie Filippas +2inventors
InventorsNathan Hilbish, Afroditi Vennie Filippas, Lee Stewart, Andrew Good
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Abstract
Photodiodes in combination with an amplifier of transimpedance configuration provides an optical vibration detector having a linear frequency response with a light emitter and sensor of sufficiently small size to be inserted between strings of a musical instrument in order to provide signals suitable for amplification. The frequencies of vibrating strings of a musical instrument can be converted in accordance with either of two converter embodiments to control a music synthesizer, an automatic music transcription arrangement or the like.
Claims17
A vibration transducer comprising
- a source of substantially collimated light,
- a photodiode having a limited light reception angle corresponding to width of a light beam emitted from said source of substantially collimated light,
- a board for mounting said light source and said photodiode in a generally coaxial orientation, and
- an amplifier circuit having a transimpedance configuration.
A converter for converting a pitch frequency to a MIDI control signal, said converter comprising
- an analog to digital converter,
- a fast Fourier transform processor,
- a peak detector, and
- a look-up table for correlating a frequency of a peak detected by said peak detector to an identification of a musical note.
A converter as recited in claim 12, wherein said look-up table is constituted by a field programmable gate array.
A signal converter for converting an analog waveform into a digital code, said signal converter comprising
- a plurality of neural networks connected in cascade and receiving a spectrum of said waveform as an input, wherein each of said plurality of neural networks provides a binary classification of a frequency component of said spectrum of said waveform.
Dependencies are inferred from the claim text.