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:
May. 03, 1988
Filed:
May. 08, 1986
Harold R Walker, Edison, NJ (US);
Other;
Abstract
There is disclosed a high speed data transmission system for transmitting a binary data signal over a communications path. The binary data signal is clocked at a given period. The system comprises encoded means responsive to a binary NRZ input data signal to provide at an output an encoded digital signal having time periods greater than multiples of the clock period, whereby the encoded signal occupies a lesser effective bandwidth than the NRZ signal would occupy. There are balanced modulator means having an input responsive to the encoded signal and another input adapted to receive a carrier frequency to provide at an output a double sideband suppressed carrier signal. Coupled to the output of the balanced modulator are narrow bandwidth filtering means including first low pass and second high pass parallel filter paths each having a common input terminal coupled to the output of the modulator. The ouputs of the low and high pass filters are symmetrically combined to provide a narrow single sideband signal for transmission characterized in that transitions between binary levels in said encoded signal are manifested by distinct phase changes in said single sideband signal.