| 摘要 |
<p>PURPOSE:To surely control reverberation without delaying timing even at the time of long distance communication concerning the non-contact communication equipment for intermitting a high frequency signal at a fixed duty ratio and for transmitting signals corresponding to the presence/absence of its reverberation. CONSTITUTION:A counter 50 counts the number of pulses in a carrier from a signal, which carrier is intermitted, to be transmitted from a write/read control unit. When the count-up output of the counter 50 is set at the number of pulses at a time point to stop oscillation, the count-up output can be provided at that stop time point. Therefore, by generating a shant pulse based on this output, echo can be controlled without delaying timing.</p> |
