| 摘要 |
<p>PURPOSE:To reduce the number of times for operating a switching circuit and to reduce energy consumption by making a transmission carrier intermittent by the modulation pulse of a frequency which is lower that of the transmission carrier and higher than that of transmission data. CONSTITUTION:When transmission data (a) of 9,600bps are modulated and transmitted by a carrier (b) of 1MHz, the carrier (b) is made transmittent by a modulation pulse (c) of 62.5kHz and the transmission data (a) are loaded to this carrier and transmitted as a transmission signal (d). By suitably selecting the time constant of a filter in a reception circuit, a detection waveform (e) is obtained and by inputting the waveform to a comparator for which a thresh old level is defined as VTH, a transmission waveform can be reproduced as an output (f). Since the number of times for operating the switching circuit of a transmitter is decreased, the energy consumption is reduced.</p> |
