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:
Oct. 02, 1990
Filed:
Sep. 20, 1989
Applicant:
Inventors:
Barry G Maufe, London, GB;
Nicholas A Young, Worcester, GB;
Assignee:
EMI Limited, Hayes, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04K / ;
U.S. Cl.
CPC ...
375-1 ; 331 78 ; 364726 ;
Abstract
A signal generator produces a spread-spectrum bandwidth signal in the frequency range 40 to 90 KHz for use in a domestic mains signalling system. In the generator, sixteen individual frequencies, equi-spaced in that range, pass to samplers operating at a clock frequency of 204.8 KHz and then to quantisers before storage. The resulting signals are then assembled in appropriate manner by selector switch before being filtered when (temporarily) in the frequency domain. The resultant signals duly reach catalogue store, whose output can be used for programming an EPROM in a mains signalling interface unit.