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:
Dec. 23, 1997
Filed:
Jul. 14, 1994
William A Williamson, III, Stone Mountain, GA (US);
BellSouth Corporation, Atlanta, GA (US);
Abstract
An improved automatic gain control circuit for a telephonic headset having a gain control stage in the audio signal path to attenuate tones, in which the gain is controlled by a control signal. A peak filter and an average filter generate signals proportional to the peak and average levels of the input signal, respectively. The signals are compared and a control signal is generated based on the relative signal levels. When the average signal exceeds a predetermined fraction of the peak signal, the circuit recognizes the signal as a tone and generates a control signal that causes the gain control stage to increase attenuation of the input signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile