Method and circuit for recovering a logic signal from a band limited signal channel

DETAILED DESCRIPTION The foregoing objects are achieved by passing the VITC or other distorted bi-level logic signal through an appropriate high pass (differentiated) filter to remove all but the narrow spectrum associated with the rising and falling edges of the NRZ modulated VITC signal.
Optionally, the signal may be low-pass filtered to improve noise immunity and remove any chroma or burst frequency components.
The signals are amplified in a differential amplifier which provides separate series of positive and negative pulses with an average DC value of zero.
These pulses correspond to the rising and falling edges of the original signal with the positive pulses corresponding in time to the rising leading edge and the negative pulses to the falling trailing edge.
These pulses are detected and used to reconstruct the original signal by employing the positive pulses to set a flip-flop while the negative pulses reset the flip-flop.