Digital communication device
US5818870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1991 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Aug 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/297
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital communication device of the present invention is provided with a modulation circuit for modulating a digital transmit signal, a first interpolater for converting the modulated signal in frequency, a coding circuit for coding the signal converted in frequency into an audio PCM transmission code with reference to a voice companding code table, a decoding circuit for decoding a coded audio PCM receive code into a digital signal with reference to the voice companding code table, a second interpolater for converting the decoded digital signal in frequency, and a demodulation circuit for demodulating the converted signal, and digitally performs modem modulation/demodulation and voice codec processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.