Sequencing scheme for reducing low frequency tone generation in an analogue output signal
US6232903A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1995 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Dec 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/66
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A noise cancellation circuit for use with a digital signal includes a plurality of equally weighted cells (53) for providing an analogue output signal (35) in dependence upon the value of the digital signal. A switching arrangement (51) dynamically switches a number of the plurality of cells according to a sequencing scheme, which comprises a first sequence arranged to switch each of the plurality of cells (53) an equal number of times, and a second sequence arranged to define one of the plurality of cells (53) as a starting position for the first sequence. In this way low frequency tone generation within the analogue output signal is substantially eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.