Apparatus and method for direct digital frequency synthesis
US6587862B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1999 |
| Grant date | Jul 1, 2003 |
| Priority date | — |
| Expiry date | Sep 7, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/0356
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method are provided for synthesizing a variable frequency sinusoidal waveform. The apparatus and method exploit octant symmetry properties of sine and cosine waveforms, when taken together. The digital frequency synthesis apparatus includes a phase signal and a phase-to-amplitude converter. The phase signal indicates a desired phase angle of the sinusoidal waveform. The phase-to-amplitude converter is coupled to the phase signal. The phase-to-amplitude converter provides a desired amplitude sample corresponding to the desired phase angle, where the desired amplitude sample is derived from amplitude samples corresponding to an octant of the sinusoidal waveform. The phase-to-amplitude converter includes a Haar Transform-based coarse octant amplitude sample generator that computes Haar coefficients corresponding to the phase signal and transforms the Haar coefficients into the desired amplitude sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.