Apparatus and method of additive synthesis of digital audio signals using a recursive digital oscillator
US7317958B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2000 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Mar 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2250/635
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method of performing additive synthesis of digital audio signals using a novel recursive digital oscillator includes the step of receiving digital audio signal frames wherein each digital audio signal frame includes a set of frequency, amplitude, and phase components represented as coefficients of variables in a mathematical expression. Each digital audio signal frame thereby includes a frequency coefficient representation. Converted frequency coefficients are formed by linearly re-mapping the bits of the frequency coefficient representation and adding range extension via a shift amount in order to bias audio reproduction accuracy toward low frequency signals. Additive synthesis is then performed with the converted frequency coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.