PURPOSE: To increase the efficiency for the transmission of signal, by giving a parallel-series conversion and modulation to the signal operated by a logical signal, transmitting a carrier wave to receive it via a repeater, converting the carrier received wave signal into an electric signal and detecting the modulated component to give a series-parallel conversion to this component.
CONSTITUTION: An operation signal circuit 1 converts a switch signal or a code signal into a logic signal and gives a parallel-series conversion 2 to the logic signal to obtain a series signal. This series signal is modulated 3 and amplified 5, and a carrier wave is transmitted into the air by a converter 6. At a repeating part the carrier wave propagating in the air is detected, and this detected carrier wave is converted into an electric signal to be amplified 8. Then the output of the amplifying circuit 8 is transmitted again into the air. On the other hand, at a receiving part the desired carrier wave is converted into an electric signal by a receiving transducer 10 and then amplified 11. Then the modulated wave component under the transport is detected to obtain a series signal equivalent to that of the transmitting part. This series signal receives a series-parallel conversion 13 to be changed again to a parallel signal. Then a prescribed form signal is delivered through a logical circuit 14.
KAMIYAMA YASUSHI
YOSHIKAWA YOSHIKAZU
NAKAMURA OSAMU
