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:
Sep. 24, 2002
Filed:
Mar. 14, 2000
Yu Wan, Haerbin City, Heilongjiang Province, 150036, CN;
Other;
Abstract
A controlling method and apparatus of constant-frequency sound-production for an electric horn are described. These are achieved. And comprised by a monolithic-processor. It's characterized in that frequency pulse output from constant-frequency oscillator is collected as base resonant frequency of each horn (accuracy at least +0.05 HZ), thereby the horns can operate in optimum condition driven by electric driving signal, duty cycle of the driving signal can be arbitrarily adjusted in the range of 1-99% based on sound production feature of different horns. It overcomes the shortcomings that sound changing and sound level descending may arise under the influence of environmental temperature and motor vehicle's voltage variation in the horn with contact and various present electric horns. It also can be used as a signal source having adjustable frequency and pulse width.