The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 1997
Filed:
Jun. 01, 1995
Hitachi, Ltd., Tokyo, JP;
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.