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. 14, 2011
Filed:
Nov. 04, 2005
James M. Jensen, Columbia, MD (US);
Wendell D. Lynch, Silver Spring, MD (US);
Michael M. Perelshteyn, Gaithersburg, MD (US);
Robert B. Graybill, Woodstock, MD (US);
Sayed Hassan, Clarksville, MD (US);
Wayne Sabin, Baldwin, MD (US);
James M. Jensen, Columbia, MD (US);
Wendell D. Lynch, Silver Spring, MD (US);
Michael M. Perelshteyn, Gaithersburg, MD (US);
Robert B. Graybill, Woodstock, MD (US);
Sayed Hassan, Clarksville, MD (US);
Wayne Sabin, Baldwin, MD (US);
Arbitron Inc., Columbia, MD (US);
Abstract
Apparatus and methods for including a code having at least one code frequency component in an audio signal are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated and based on these evaluations an amplitude is assigned to the code frequency component. Methods and apparatus for detecting a code in an encoded audio signal are also provided. A code frequency component in the encoded audio signal is detected based on an expected code amplitude or on a noise amplitude within a range of audio frequencies including the frequency of the code component.