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:
Dec. 20, 1994
Filed:
Aug. 17, 1992
David P Owen, Dunstable, GB;
Marconi Instruments Limited, Hertfordshire, GB;
Abstract
A waveform generator suitable for use in the testing of instrument landing systems comprising: a first generator (1) for generating digitally a first waveform comprising the superposition of a second waveform (19) of a first frequency and a third waveform (21) of a second frequency; a second generator (3) for generating digitally a fourth waveform comprising the superposition of a fifth waveform (25 or 27) comprising a phase reversed version of one (19 or 21) of said second (19) and third (21) waveforms of the frequency of said one waveform (19 or 21) and a sixth waveform (23 or 29) in phase with and of the frequency of the other one (19 or 21) of said second (19) and third (21) waveforms; and a circuit (7) for combining said first and fourth waveforms thereby to produce a waveform suitable for said use.