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. 15, 1986
Filed:
Mar. 07, 1983
Charles R Barrows, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
A transmission path is monitored for its suitability for transmission of digital data by transmitting over the transmission path a video test signal which includes a horizontal sync pulse and at least one half-cycle of a generally sinusoidal pulse occurring at a predetermined time after the sync pulse, the generally sinusoidal pulses being inverted in alternate lines or alternate fields of the video test signal. The signal received at the other end of the transmission path is displayed on an oscilloscope-type CRT device having its horizontal sweep triggered by the horizontal sync pulse, so as to superimpose the alternate generally sinusoidal pulses. The configuration of the generally eye-shaped area resulting from such superimposition depends on the suitability of the transmission path for transmission of digital data.