Music – Instruments – Electrical musical tone generation
Reexamination Certificate
2007-02-13
2007-02-13
Donels, Jeffrey W (Department: 2837)
Music
Instruments
Electrical musical tone generation
Reexamination Certificate
active
11274784
ABSTRACT:
Prior art synthesizers often select a small interval d to detune. For example, if the nominal oscillator frequency was 1000 Hz, then applying a detune parameter of 10 cent would result in a detuned oscillator frequency of 1006 Hz. However, at the next octave, the nominal frequency would be 2000 Hz with the detuned oscillator frequency of 2012 Hz. Accordingly, a detuned oscillator has a frequency deviation which is proportional to its nominal frequency. Hence, when mixing detuned oscillators, the resulting signal has a beat frequency which varies with the pitch and doubles with each octave.An aim of the present invention is to provide a music synthesizer whereby sounds are generated with a constant optimum beat across a large range of tones.The present invention relates to a music synthesizer comprising a first and second oscillator and a signal generator which applies a constant beat parameter to a pitch signal to derive the input for said second oscillator, thereby enabling a synthesizer output to be generated at a substantially constant beat.
REFERENCES:
patent: 1823724 (1931-09-01), Carlson
patent: 1940093 (1933-12-01), Lindridge
patent: 3136949 (1964-06-01), Firestone
Apple Computer Inc.
Blakely , Sokoloff, Taylor & Zafman LLP
Donels Jeffrey W
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