Digital Noise Filter
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
Noise pulses are sometimes imposed on digital signals transmitted on a transmission line. To avoid propagation of errors it is essential that these noise pulses be filtered out of the transmission. This can be readily accomplished by a simple latching network, as shown above. In operation, the latch 1 (Fig. 1) receives the digital input signal on 4. For purposes of illustration, noise pulses 9 and 10 are shown. A free-running clock signal on 8 is provided to latches 1 and 3. The clock signal transmits the input to the output of each latch with a one-cycle delay. Output 5 of latch 1 is provided to compare and alter circuit 2 along with the output of latch 3 and the input signal to latch 1. As shown by the signal diagrams (Fig.