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:
Jul. 19, 2005
Filed:
Nov. 16, 2000
James Terrell Walker, Palo Alto, CA (US);
Kamran Khorram Abadi, Memlo Park, CA (US);
Robert Gustav Lorenz, Menlo Park, CA (US);
James Terrell Walker, Palo Alto, CA (US);
Kamran Khorram Abadi, Memlo Park, CA (US);
Robert Gustav Lorenz, Menlo Park, CA (US);
Piradian, Inc., Menlo Park, CA (US);
Abstract
An apparatus is provided for processing a wide dynamic range analog signal which comprises multiple components such as a signal with an in-phase component and a quadrature-phase component in for example separate I and Q data channels, wherein each channel has a dynamic range compressor stage and an operator stage which processes the compressed signals. Optionally the apparatus has a dynamic range expander stage following the operator stage. A method according to the invention involves processing I and Q information after first independently compressing the dynamic range of the signal according to a logarithmic transfer characteristic over a frequency range of interest. A mathematical operation through a F(i,q) function (corresponding to the operator stage) is performed on the compressed components, thereby producing normalized components. The operating transfer function F(i,q) cross links the data channels to effect normalization based on amplitude of information in each of the channels. Dynamic range expansion provides expanded components in an expanded domain. The invention is applicable to any analog signal system having a plurality of channels carrying related signal information.