The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2007
Filed:
Nov. 14, 2005
Chris Adam, Norderstedt, DE;
Chris Adam, Norderstedt, DE;
Apple Computer, Inc., Cupertino, CA (US);
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.