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:
Jan. 18, 1983
Filed:
Sep. 22, 1980
Applicant:
Inventor:
Charles Soulliard, Tucson, AZ (US);
Assignee:
Midian Electronics, Inc., Tucson, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 328 75 ; 455 38 ;
Abstract
A tone decoder for the sixteen standard Bell System DTMF tone pairs is presented which is comprised of first and second tone detectors adapted to provide logic signals in response to detection of predetermined frequencies. The logic signals are processed by a counter which is incremented by simultaneous logic signals from the first and second tone detectors and which controls a switch adapted to change the frequencies to which the tone detectors are responsive.