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:
Mar. 02, 2004
Filed:
Nov. 02, 1999
Peter Neil Moss, West Drayton, GB;
British Broadcasting Corporation, London, GB;
Abstract
A digital audio broadcasting (DAB) receiver designed for receiving a signal with 1536 active carriers generated by an inverse fast Fourier transform (FFT) with 2048 points, includes the usual RF stage ( ), an IF filter ( ), and a demodulator ( ) providing baseband I and Q signals. This is followed by an anti-aliasing filter ( ), a sampler ( ), and an FFT ( ). The FFT is a 4096-point FFT, and is thus twice as long as required, and gathers twice as many points during each symbol period. However this is found to substantially simplify the construction of the IF filter ( ) and, more particularly, the anti-aliasing filter ( ). For use with real signals rather than quadrature demodulated signals, an 8192-point FFT is employed.