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:
Jun. 25, 2002
Filed:
May. 26, 1999
Infineon Technologies Ag I. Gr., Munich, DE;
Abstract
A processor for performing a block floating point Fast Fourier Transform having improved signal to quantization noise ratio performance. In the radix-2 Decimation In Time algorithm, overflow between stages is prevented by a scale down by two invoked by comparison with a fixed comparison constant. Unfortunately, the fixed comparison constant is not always optimum for maximizing the signal to quantization noise ratio, which is degraded by excessive scale down. Moreover, current mechanisms are limited to the radix-2 block floating point FFT. The processor of the present invention provides the programmer with a FFT compare register which is loadable under program control, thus allowing the programmer to adjust the threshold at which scale down of the stage output is activated for better control over the signal to quantization noise ratio. In addition, the present invention supports other FFT structures besides the radix-2 block floating point FFT.