| 摘要 |
PURPOSE:To eliminate the need for signal capacity normalization circuits and to vary easily the coefficients of a coefficient multiplier by obtaining a circulating delay signal input from the output of the coefficient multiplier. CONSTITUTION:If the signal of a video signal input terminal 1 is Vi; the input signal of the coefficient multiplier 5 is V1; the output signal of its coefficient multiplier 5 is V2; the output of a signal output terminal 9 is V0; the feedback coefficient of the coefficient multiplier 5 is K; the transfer function of 1H delay circuit 3 is G, two equations are established as follows; V0=V1-V2=(1-K)V1, V1=Vi+GV2=Vi+KGV1. If V1 is eliminated from the above equation, the relation of the equation 1 is established between an input and output. Equation 2 shows a comb-line filter which has a venter at the integer magnification portion of a horizontal frequency. At this time, the signal level of the venter is 1 irrespective of the value of K.
|
