Digital processing of pilot-tone amplitudes
US6590733B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1999 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Dec 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5921
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system having an input signal set with at least two signals having mutually exclusive frequencies f1 and f2 being part of the input signal set, whose amplitude is represented in an input digital representation, the amplitudes of each of the at least two signals are digitally represented. A digital representation of the frequency of each of the signals is derived. A digital representation of the sine function and of the cosine function of the frequency of each of the signals is derived based on the digital representation of the frequency. The digital representations of each of the sine and cosine functions is mixed with the input digital representation to derive digital representations of the sine and cosine functions of each of the signals. The digital representations of the sine and cosine functions of each of the signals are processed to derive a digital representation of the amplitude of each of the signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.