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. 28, 1995
Filed:
Dec. 17, 1992
Norman T Rollins, Sunrise, FL (US);
King F Lee, Ft. Lauderdale, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A volume control circuit comprises a variable gain stage (306), having a variable gain, and an up/down counter (324) for counting. The counter (324) has a counter input (321) and a counter output (333) for providing a first word (333) for controlling the gain of the gain stage. A microprocessor interface (326) includes an interface output (323) for providing a second word. A digital magnitude comparator (333) compares the first (323) and second (333) words. The comparator having a first input (333) connected to the counter output, a second input connected to the interface output (323), and a comparator output connected to the counter input (321), provides a count signal (329) if the words do not match and for providing a non-count signal (329) if the words match. Thus, responsive to the count signal (329), the up/down counter (324), counts from the first word, in a direction approaching the second word by a least significant bit to form a new first word, for controlling the gain of the gain stage.