CMOS-compander
US5293139A · kind A · utility
5Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Oct 13, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a compressor and an expander for use in a compander realized in CMOS-technology which is used to improve speech quality in mobile phone systems AMPS (NAMPS), NMT and TACS (JTACS, ETACS, NTACS). The compander is integrated with other functions of the mobile phone. The compressor and expander have SC-amplifiers controlled by a control logic. A double comparator XOR-block is used in the control of the amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.