Integral switched capacitor FIR filter/digital-to-analog converter for sigma-delta encoded digital audio
US5012245A · kind A · utility
129Cited by
5References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 4, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Oct 4, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2021/0096
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A combined finite impulse response filter and digital-to-analog converter for converting sigma-delta over-sampled data into analog form. The filter removes out-of-band noise energy from the reconstructed analog signal resulting from the sigma-delta encoding process. The filter/converter is implemented in switched-capacitor technology. Further, a method of designing the optimum number of taps and the tap weight coefficients of the filter is given.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.