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adjusted amplitude applies approximately Assume audio signal beam blanking block diagram brightness burst cable camera tube capacitance capacitor carrier channel characteristic impedance chroma circuit coil colour component connected control desk correction deflection difference diode disadvantage distortion electron emitter erase error feedback film filter flux gate genlock head wheel helical scan high frequencies horizontal impedance input lamp length light line sync luminance luminous flux luminous intensity magnetic metres microphone mirror modulation monitor noise objective lens obtained opto-isolator oscillator oscilloscope output phase detector picture pulse picture sync picture tube playback plumbicon position possible potentiometer printed circuit board problem putse resistance resistor result Section shown in Figure shows signal-to-noise ratio sound square wave switching sync pulse synchronisation tape speed target television transistor tuner U-matic velocity vertical video amplifier video disc video recorder video signal vidicon voltage