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. 20, 1999
Filed:
May. 08, 1997
Kenji Irie, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method and apparatus to avoid wrong detection when detecting signals including CAS (Call Alert Signal) formed by specific frequencies in the audio range, wherein frequency components forming a specific signal are detected from an input signal, and it is judged whether any signal component other than that of specified frequency range is included or not in entered audio range signal by comparing the energy level of the entered audio range signal with the energy level of only the specified frequency components extracted from the input signal. If any signal component other than that of the specified frequency range is judged to be included as a result of the energy level comparison, the signal is judged not to be the CAS signal.