Fast find fundamental method
US6766288B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1999 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Oct 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2250/161
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention contains three methods for quickly deducing the fundamental frequency of a complex wave form or signal. One method uses the relationships among the frequencies of higher harmonics including ratios of frequencies, differences between frequencies, ratios of frequency differences, and relationships stemming from the fact that harmonic frequencies are modeled by functions of an integer variable whose values represent harmonic ranking numbers. Another method depicts the predicted/modeled relationships of the harmonics of selected frequency registers on logarithmic scales, records the frequencies of detected partials on like scales, and moves the scales searching for a match of harmonics. Possible harmonic ranking numbers and the implied fundamental frequency can be extracted directly from a match. By still another method, harmonic frequencies for a plurality of fundamentals are compared to partials linked to an unknown fundamental, and the unknown fundamental is deduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.