Patent ID: 6272227
Filing Date: 2001-08-07
Classification: H03G

Abstract:
A simultaneous two-way communication apparatus using an ear microphone, comprising:a transceived sound volume control circuit, which controls in sound volume a sound being transceived, and is interposed between: an ear microphone containing both a microphone and a speaker unit; and, a communication system such as a PHS communication system and like communication systems;said transceived sound volume control circuit comprising:a communication switching means for performing a switching operation in communications; a high-frequency signal cutting means, which attenuates a received sound signal in a transmission mode and then cuts a high-frequency signal contained in said received sound signal thus attenuated; and, a transmitted-sound-signal attenuating means for attenuating a transmitted-sound signal in a reception mode; and whereinsaid simultaneous two-way communication apparatus further comprises a means for detecting energy in the vicinity of the first formant of a sound in order to prevent said switching operation from being initiated due to extraneous noises and like extraneous factors.