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. 07, 2001
Filed:
Sep. 24, 1998
Hiroaki Yanagisawa, Tokyo, JP;
Temco Japan Co, Ltd, Tokyo, JP;
Abstract
The apparatus eliminates howls to permit a received sound to increase in sound volume to enable the apparatus to be used in high-noise areas, and comprises: a transceived sound volume control circuit,for controlling in sound volume a transceived sound, the circuit,being interposed between: an ear microphone,containing a microphone,and a speaker,and, a communication system,such as PHS. The circuit,comprises: a communication switching means,for performing a switching operation in communications; high-frequency-signal cutting means,which attenuate a received sound signal in a transmission mode and then cut a high-frequency component of the signal; and, a transmitted-sound-signal attenuating means,for attenuating a transmitted-sound signal in a reception mode. The apparatus comprises a means,for cutting energy in the vicinity of a resonance point of the microphone,and a means,for detecting energy in the vicinity of the first formant of a sound to prevent the switching operation from being initiated due to extraneous noises.