| 摘要 |
A low level television transition signal booster offsets low level video transitions by a predetermined amplitude pedestal prior to the passage of the video through a path in a television system characterized by the unwanted loss of small detail information in order to correct in advance this expected loss of details. The low level signal booster includes a linear signal main path from an input to an output and a low level signal expansion circuit connected in parallel to the linear signal path which generates and adds a nonlinear signal complement which when combined in proper time relationship with a low level video transition signal below a predetermined value increases the instantaneous amplitude thereof generally by the amount corresponding to the pedestal. The signal complement is generated from the low level video transition signal, yet it is not generated for any video transition signals lying above the predetermined value. The invention embraces a low level transition signal booster system which operates either in one dimension only or simultaneously in the horizontal and vertical dimensions.
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