Communication method and equipment for freeze-frame video phone
US5199061A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jan 16, 1992 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Jan 16, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/33371
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention comprises a system bus performing control and data transmission function among modules, a system control means, connected to the system bus, performing system control and interrupt control function, a modem and DTMF signal processing means, connected to the system bus, performing modulation and demodulation in the transmission rate of 9,600 bps, 4,800 bps, and 2,400 bps, and transmission and reception of DTMF signal, a standard telephone line connection means connecting the modem and DTMF signal processing means and a telephone to a standard telephone line, a program ROM, connected to the system bus, storing a program which controls communication through the modem and DTMF signal processing means, and a RAM, connected to the system bus, retaining current data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.