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:
Nov. 28, 1989
Filed:
Feb. 26, 1988
Fujio Inagami, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A portable cordless telephone set for outputting various types of discrimination sounds, in radio communication with a base unit, and having a telephone transmission and reception portion. The portable cordless telephone set includes a sound generation control circuit having at least one microcomputer and receiving a discrimination sound request from the telephone transmission and reception portion; a clock generation circuit generating an operation clock of the sound generation control circuit; a sound generator generating sound having different sound pressures in response to different resonant frequencies, one of the resonant frequencies being adjacent to a frequency of the operation clock; a frequency divider circuit providing at least one divided frequency signal; a switch circuit selectively outputting a signal from the clock generation circuit and the frequency divider circuit; and a timing control circuit outputting an ON/OFF timing signal of the frequency signal received from the switch circuit to the sound generator. The sound generation control circuit energizes the switch circuit and sends a command to the timing control circuit in response to the received discrimination sound request.