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,...http://www.google.nl/patents/US5657379?utm_source=gb-gplus-sharePatent US5657379 - Data communication apparatus and method for performing noiseless data communication using a spread spectrum system
Data communication apparatus and method for performing noiseless data ...
