Processor based linked compressor-expander telecommucications system
Abstract
A digital linked compressor-expander telecommunications system (Lincompex), is implemented using a general purpose digital signal processor (20) wherein the compression and expansion functions are performed by blocks of programmed code. Input audio analog signals are converted to parallel data digital signals whereupon the digital signals are input for processing. After processing, the resultant signals are passed to a 16-bit digital-to-analog converter where either the compressed or expanded digital voice data signal is converted back into an audio frequency analog signal for either transmission or communication on an output device.

Term
Term ended
Projected expiry passed 19 May 2009, 17.3 years ago.
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1 sheet
Sheet 1
Every citation, both ways
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| US4090145A | Cites | United States of America | A | Search report |
| US4123711A | Cites | United States of America | A | Search report |
| US4271499A | Cites | United States of America | AD | Search report |
8 members in 6 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 196235 | United States of America | – | |
| 19623588 | United States of America | A | |
| 19623588 | United States of America | A | |
| US19880196235 | – | – | – |
Members8
| Document | Office | Kind | |
|---|---|---|---|
| US4839906A | United States of America | A | |
| AU3493589A | Australia | A | |
| EP0342686A2 | European Patent Office (EPO) | A2 | |
| CN1038732A | China | A | |
| JPH0278334A | Japan | A | |
| EP0342686A3This record | European Patent Office (EPO) | A3 | |
| CA1287376C | Canada | C | |
| JPH06103842B2 | Japan | B2 |
6 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Application deemed to be withdrawnWithdrawn18D | 18D | |
| Information on the status of an ep patent application or granted ep patentGrantedSTAA | STAA | |
| Designated contracting statesAK | AK | |
| Search report despatchedPUAL | PUAL | |
| Designated contracting statesAK | AK | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phasePUAI | PUAI |
Numbers
- Publication
- 0342686
- Publication, DOCDB
- 0342686
- Publication, EPODOC
- EP0342686
- Application
- 109021
- Application, DOCDB
- 89109021
- Application, EPODOC
- EP19890109021
Titles3
- German
- Telekommunikationssystem mit prozessorgestütztem Kompander
- English
- Processor based linked compressor-expander telecommucications system
- French
- Système de télécommunication à compresseur-expanseur relié assisté par un processeur
Classification
- CPC, 2
- H04J3/18
- H03M7/30
- IPC, 4
- H04B14 00
- H03M7 30
- H04B1 64
- H04J3 18
Designated states9
- Contracting states, 9
- Belgium
- Switzerland
- Germany
- France
- United Kingdom
- Italy
- Liechtenstein
- Netherlands (Kingdom of the)
- Sweden