Helen Chau

US Patent:

8306134, Nov 6, 2012

Filed:

Jul 17, 2009

Appl. No.:

12/505413

Inventors:

Jon S. Martens - San Jose CA, US
Helen Chau - San Jose CA, US
Peter A. Kapetanic - Morgan Hill CA, US
Dan Levassuer - Milpitas CA, US

Assignee:

Anritsu Company - Morgan Hill CA

International Classification:

H04K 1/10
G10L 19/14
G10L 11/06

US Classification:

375260, 704205, 704208

Abstract:

A high speed receiver is provided using two parallel processing paths to enable rapid variable gain control. The parallel processing paths include a first processing path using a high resolution Discrete Fourier Transform (DFT), and a second processing path using a reduced DFT requiring fewer samples than the high resolution DFT. An initial sample of the data is processed using the second processing path with the reduced DFT by comparing a Fourier transform of the initial sample with predetermined threshold values. As a result of the comparison of the Fourier transform of the initial sample with the predetermined threshold values, a gain determination block determines whether a requirement exists for gain ranging. If gain ranging is needed, the gain of the data signal is adjusted and the gain ranging process repeats.