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. 24, 2012
Filed:
Jun. 24, 2008
Wilhelm Ernst Riedl, Indianapolis, IN (US);
Joel David Sawaski, Indianapolis, IN (US);
Kent Joseph Nysewander, Mooresville, IN (US);
Hung Chi Lai, Fishers, IN (US);
Frank Alan Nardelli, Indianapolis, IN (US);
Wilhelm Ernst Riedl, Indianapolis, IN (US);
Joel David Sawaski, Indianapolis, IN (US);
Kent Joseph Nysewander, Mooresville, IN (US);
Hung Chi Lai, Fishers, IN (US);
Frank Alan Nardelli, Indianapolis, IN (US);
Thomson Licensing, Boulogne-Billacourt, FR;
Abstract
Audio processing systems, such as full duplex digital telephone systems, are provided in which analog automatic level control (ALC) circuitry is employed to automatically control and stabilize the microphone output audio signal levels to a constant level for optimal digital signal processing. For example, an audio communication device () includes a microphone () to generate an audio signal, an analog automatic level control (ALC) circuit (), coupled to an output of the microphone (), to control a level of the audio signal output from the microphone () and output a level-controlled audio signal, and a DSP (digital signal processing) circuit () to process the level-controlled audio signal output from the ALC circuit (). The ALC () allows audio signals to be captured by the microphone () with wide dynamic range, while stabilizing the microphone output level within a reduced dynamic range compatible with the limited dynamic range of the DSP circuitry () for enhanced performance.