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:
Feb. 09, 1982
Filed:
Nov. 20, 1979
Applicant:
Inventor:
Sava Jacobson, Van Nuys, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ;
Abstract
This electronic ring sounder utilizes the loudspeaker and audio amplifier present in a speaker telephone to accomplish the bell sounding function. To this end, the amplifier is provided with a feedback circuit which, when enabled, causes the amplifier to oscillate in the audio frequency range. The feedback path includes a gate which is enabled in response to presence of the ring tone on the telephone line. Advantageously, the oscillation frequency is on the order of 1,000 Hz, and is gated on each half cycle of the ring signal. This produces a sound which closely simulates that of a conventional telephone bell.