CLAMP CIRCUIT

摘要

PURPOSE:To improve the elimination ratio of an energy spread signal without deteriorating the elimination ratio of low frequency noise by providing plural stage clamp means whose time constant differs and setting the elimination ratio of the low frequency noise and a dispersal signal independently. CONSTITUTION:The time constant represented by a capacitance of a 1st clamp capacitor 31 and a resistance of a resistor 32 is set to a value sufficiently eliminating low frequency noise and the time constant represented by a capacitance of a 2nd clamp capacitor 33 and a resistance of a resistor 34 is set to a value sufficiently eliminating a dispersal signal. Through the constitution above, the low frequency noise included in a MUSE signal is eliminated by the actin of the capacitor 31 and the resistor 32 and the dispersal signal is eliminated by the action of the capacitor 33 and the resistor 34 thereby obtaining the MUSE signal, from which both the low frequency noise and the dispersal signal are sufficiently eliminated.