Data communication apparatus and method for performing noiseless data communication using a spread spectrum system
US5657379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Jun 1, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/062
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A data communication system by which simultaneous communication of voice and data is possible without disturbing voice communication. During communication between a first telephone and a second telephone through a telephone line, when a data signal from a computer is fed to a data communication system, the data signal is modulated according to a spread spectrum system by a spread spectrum modem, mixed with the voice signal, and transmitted from a line interface to the telephone line. The signal including the spread spectrum modulated data signal and the voice signal is received in the second telephone. The voice mixed with spread spectrum modulated data signal is heard at the second telephone with only slight noise. Thus, talking can continue undisturbed, because energy of the data signal is spread to a wider band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.