| 摘要 |
PURPOSE:To change a data transmitting speed by varying just the clock frequency by using a digital circuit to constitute an LPF. CONSTITUTION:An MSK signal is delayed by an amount equivalent to a bit of the transmission data through a shift register SR1, and the coincidence is obtained between the input and the output of the register SR1 by a coincidence circuit EOR. An LPF' is provided with the 2nd shift register SR, a 1-level continuously detecting circuit AND, a 0-level continuously detecting circuit NOR and a flip-flop FF. Then the 2nd shift register SR is driven by the same clock as the register SR1, and a demodulated signal is obtained from the FF. |
