MOBILE PHONE LOUDSPEAKER COMMUNICATION DEVICE Russian patent published in 2003 - IPC

FIELD: communications engineering. SUBSTANCE: proposed device that has receiving channel of series-connected controlled electronic attenuator, amplifier, and loudspeaker, transmitting channel of series-connected microphone and amplifier, as well as electric signal detector and controlled electronic switch uses in addition comparator and timer; electric signal detector input is connected to output of controlled electronic attenuator; timer input is connected through comparator to output of electric signal detector; timer output is connected to control inputs of electronic switch and controlled electronic attenuator; electronic switch is also connected to amplifier input and to controlled electronic attenuator output. EFFECT: enhanced quality of communications. 1 cl, 1 dwg