Digital signal processing apparatus for converting a digital signal from one transmission rate to another transmission rate
US5400024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Feb 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/48
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Base station equipment of a digital mobile communication system includes a digital audio signal processing apparatus provided for each message channel for low bit rate coding and decoding a digital audio signal. Each digital audio signal processing apparatus includes a plurality of memories that store a plurality of low bit rate coding/decoding programs differing from each other to comply with different low bit rate coding/decoding methods. A system control circuit determines the low bit rate coding/decoding method of an applied digital signal for controlling a selector to select a memory that stores the corresponding low bit rate coding/decoding program. As a result, the digital audio signal processing apparatus perform digital to digital conversion of the applied digital signal according to the low bit rate coding/decoding program stored in the selected memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.