| 摘要 |
PURPOSE:To speed up a titled data transmitter and to make it highly reliable, by phase-modulating transmission data into long and short pulses, transmitting signals corresponding to the pulses with different peaks, and detecting and demodulating the signals at the reception side. CONSTITUTION:Transmission data of H, L is inputted from a terminal 3 at a transmission circuit 1, a modulating circuit 4 outputs pulses of one period corresponding to 1-bit of this data and changes the phase of a pulse signal outputted only at the change to L. This phase-modulated signal becomes a long and short pulse signal on the other hand, and this signal is applied to a driving circuit 5. The circuit 5 converts the signal into a signal with a low and high peak value corresponding to the length of pulses and outputs the signal from a transformer T. A reception circuit 2 detects the presence/absence of a reception data signal inputted from the transformer T at a signal detecting circuit 6, this detecting signal demodulates the reception data into an original data at a demodulation circuit 7 and outputs the data signal from a terminal 8. Since one pulse is enough for one bit, the redundancy is less and high-speed transmission can be attained. |
