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:
Aug. 16, 1977
Filed:
May. 17, 1976
Applicant:
Inventor:
Glenn L Richards, Rochester, NY (US);
Assignee:
Stromberg-Carlson Corporation, Rochester, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ;
Abstract
A digital tone detector is of the period detection type employing a digital counter which is stepped by means of a high speed clock. The counter is reset by zero-crossings of an analog tone signal. A set of period range decoder gates indicate the presence of any of a set of predetermined frequency tones. A .div. 4 counter is introduced between the terminal which receives the zero-crossing signal and the reset input of the counter. Sequence control circuits are provided to coordinate the timed relationship of readout and initiation of a new detection period such that the speed of response is minimally degraded by the .div. 4 counter.