Television signal transition booster.

摘要

A transition level signal booster (10) decreases transition time of low level transitions within a video signal without creating artifacts incident to high level transitions within the video signal. The booster includes an input (12) for receiving the video signal, an output (20) for delivering a main path video signal in which transition times of low level transitions have been decreased, a main path (14) for the video signal extending between the input and the output, the main path including a main path adder means (18) for adding a transition boost signal to the video signal, a transition boost signal generator including a connection to said input for receiving the video and for generating the transition boost signal, the generator comprising: a high frequency transition signal generator (22) for generating a high frequency transition signal incident to the detection of a transition level in the video signal, a wave shaper (28) including a first path having a delay match (32) in series therein for putting out a first signal and a second path in parallel with the first path, the second path including sign removal and shaper means (34) therein for generating a second control signal having a decreasing amplitude for each video transition having a magnitude above a predetermined amount, a multiplier (36) for multiplying the first signal by the second signal to generate the transition boost signal, the multiplier being connected to the main path adder means so that the transition boost signal may be added to the main path video signal, thereby to decrease the transition times of low transition levels.