Conversion of a PCM signal into a UPWM signal
US6657566B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1998 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Oct 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M5/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
To correct non-linearity and noise in the conversion of a pulse code modulated signal (PCM) into a uniform pulse width modulated signal (UPWM), a model is made of the known non-linearity in the conversion by dividing a plurality of non-linearity components in the model, where the polynomial components are separately weighed with filter coefficients. The model is used as a basis for the construction of a filter of the Hammerstein type whose non-linear parts consist of a division of the PCM signal into a plurality of powers, and whose linear parts are approximated by means of the model made. With the circuit of the invention it is now possible to construct a purely digital amplifier which has a great efficiency, low weight, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.