Circuit for PCM conversion of an analog signal, with improvement in gain-tracking
US5287106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1988 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Apr 28, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The circuit includes a filter to which an analog signal is applied, a quantizer driven by the filter, a sampler at a desired frequency driven by the quantizer and a PCM encoder driven by the sampler. The quantizer generates a quantize signal according to the received analog signal and further generates a difference signal according to the difference between a quantized signal and the analog signal. A feedback circuit feeds back the difference signal from the quantizer to a stage of the filter so that the overall transfer function from the input of the feedback circuit to the output of the filter is equivalent to a low pass filtering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.