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. 28, 1996
Filed:
Aug. 19, 1993
Robert D Morrison, Star, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A propagation-delay-transparent, video-signal interface suitable for use in a laser printer to carry a video signal from a formatter to a laser driver with minimal distortion. The interface includes two transmission paths, one for carrying the video signal produced by the formatter and another for carrying an inverted video signal or complement of the video signal. A differential circuit is included in the interface to determine a difference between the signals transmitted by the two transmission paths so that common-mode noise introduced along the transmission paths is substantially eliminated. The transmission paths include buffers, which restore pulses in the video signal to appropriate digital levels. The differential circuit includes hysteresis circuitry that, in combination with the differential function of the differential circuit, eliminates pulse width distortion of the video signal caused by delays of the buffers. The buffers are formed in pairs on common substrates so that the two transmission paths have nearly identical propagation delays, to further minimize pulse width distortion.