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:
Oct. 10, 1995
Filed:
Dec. 08, 1994
Robert A Valley, Branford, CT (US);
Earmark, Inc., Hamden, CT (US);
Abstract
The presence of human voice signals in audio signals is detected by a method and apparatus based on the recognition that fundamental frequency components of human voice signals are separated from one another by a characteristic frequency difference ranging from about 120 hertz to about 180 hertz. A limited frequency band portion of the audio signals is mixed and filtered to produce a signal containing the difference frequencies of the frequency components included in the limited frequency band portion of the audio signals, and the latter signal is processed to determine whether it contains a component of significant magnitude representing the human voice characteristic difference frequency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile