Gamma correction circuit for video signals - derives video output signal with positive gamma coefficient from signal with negative gamma coefficient (NL080277)

摘要

The circuit comprises an input to which the negative gamma coefficient input signal (Vx) is applied. There is a first reference signal source (VB). A combination device (100) is connected to the input for the input signal (Vx) and for the first reference signal source (VB), and delivering a sum signal (Vx + Vb) a second reference signal source (Vz). A deliver (300) divides the second reference signal (Vx) by the sum signal (Vx + Vb) and delivers corresponding quotient signal (VO). A third reference signal source (P) is connected to the divider output.