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:
Apr. 18, 2000
Filed:
Oct. 17, 1997
Ryoji Okita, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A transmission apparatus applied as a modem connected to a private branch exchange discriminates coordinates of an analog signal inputted thereto on a two-dimensional coordinate plane and transmits the signal, whose coordinates have been discriminated, as a digital signal. The transmission apparatus includes a frequency shifting section for performing frequency shifting for the inputted analog signal so that a tone signal of a single frequency may be a dc signal, and a coordinate discrimination section for discriminating coordinates on the two-dimensional coordinate plane of the analog signal for which the frequency shifting by the frequency shifting section has been performed. By the transmission apparatus, a single tone signal is transmitted without suffering from deterioration of the S/N ratio and so forth.