Modem
US6118857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 1998 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Aug 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The data transmission apparatus has a subscriber connection for a telephone subscriber line and a data connection for connection to a computer. A modulator section converts the digital data received from the computer into a transmission signal which is suitable for transmission via the telephone subscriber line. A demodulator section converts the signal received from the telephone subscriber line into a digital data stream. The data transmission apparatus has a device for detecting a special signal that is contained in the received signal at times. The special signal may be, in particular, a call-waiting signal injected into the subscriber line at an exchange while a call is waiting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.