| 摘要 |
PURPOSE: A hands-free device using radio signals is provided to call in every place without holding a cellular phone, and call with a car audio system of vehicles in driving, and with radio receiver of an audio system in home without using hands. CONSTITUTION: A hands-free device using radio signals comprises a hands-free device(2) and a radio receiving device(3). The hands-free device(2) has a microphone(21), a first/second amplifier(22,24), a receiver(23), a frequency generator(25), a variable switch(26), and a modulator(27). The microphone(21) converts user voice into voice signals. The first amplifier(22) transmits amplified voice signals to cellular phones. The receiver(23) receives voice signals of opposite sides inputted from cellular phones. The second amplifier(24) amplifies received voice signals. The frequency generator(25) generates predetermined frequency signals. The variable switch(26) varies a frequency value generated in the frequency generator according to user operations. The modulator(27) modulates voice signals output from the second amplifier, according to a high frequency signal output from the frequency generator, to transmit via an antenna. The radio receiving device(3) has a tuner(31), a third amplifier(32), and a signal processor(54). The tuner(31) varies a tuning frequency according to user operations, detecting voice signals received from the hands-free device among received signals. The third amplifier(32) amplifies the detected voice signals. The signal processor(33) processes the amplified voice signals, to output via a speaker.
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