Apparatus for differential interpolation pulse width modulation digital-to-analog conversion and output signal coding method thereof
US9161122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jan 18, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A differential interpolation pulse width modulation (iPWM) digital to analog converter is provided, including an iPWM module for generating differential pulses from an input digital audio data stream, a power driver for providing energy to a terminal load and a filter for removing unwanted harmonic signals to reconstruct an analog signal, wherein the iPWM module further includes a PWM pulse generator to convert the digital input numerical code to a series of time domain pulses; an interpolation unit to increase the time domain resolution of the pulses; a self-calibration unit to maintain the pulse-width accuracy of the interpolation unit; a differential pulse width generator to convert the series of time domain pulses into voltage and time domain differential form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.