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. 06, 1988
Filed:
May. 02, 1986
Ing. C. Olivetti & Co., S.p.A., Turin, IT;
Abstract
The line of a document is focused onto a series of reading elements, such as the cells of a charge coupled device, from which a serial output signal is obtained and applied to an analogue-to-digital converter. In order to compensate for the fall-off in the transfer function of the objective and the said elements at high spatial frequencies, the signal is processed, before A/D conversion, by a multi-stage filter (27), comprising an adjustable band pass stage (36) for setting the zero level, an adjustable band pass stage (41) for setting the output level and an intermediate band pass stage (38) with unity gain, which eliminates sampling noise. Matching is provided by an input, low pass filter, emitter follower stage (33) and an output, high pass filter, emitter follower stage (43).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile