Music – Instruments – Electrical musical tone generation
Reexamination Certificate
2005-10-25
2005-10-25
Fletcher, Marlon (Department: 2837)
Music
Instruments
Electrical musical tone generation
C084S609000, C084S619000, C084S649000, C084S657000
Reexamination Certificate
active
06958442
ABSTRACT:
A software solution to the pitch limitations inherent in the MIDI standard. The invention uses the Polyphonic Aftertouch (also known as “Key Aftertouch”) messages available in the basic MIDI standard to retune selected notes, according to the following process: First, a standard note lying on the Western scale is played. Then, a Polyphonic Aftertouch signal is immediately sent to shift the pitch of the standard note to transform it into a non-standard note. The Polyphonic Aftertouch message follows immediately behind the Note On message and pitch value creating the standard note. Thus, the standard note only sounds for about 960 microseconds. The shortest temporal resolution of the human ear is approximately 2–3 milliseconds. As a result, the human ear does not hear the first standard note, since it does not sound for a sufficient length of time. The human ear only perceives the pitch shifted note.
REFERENCES:
patent: 5412153 (1995-05-01), Saito
patent: 5501130 (1996-03-01), Gannon et al.
patent: 5949012 (1999-09-01), Ishii
patent: 6087578 (2000-07-01), Kay
patent: 6323408 (2001-11-01), Liu
Fletcher Marlon
Florida State University Research Foundation
Horton J. Wiley
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