Patent ID: 6292235
Filing Date: 2001-09-18
Classification: H04N

Abstract:
A distortion correction system, comprising:a switchable digital filter for interpolating distortion correction values, said distortion correction values together with interpolated distortion correction values being supplied as an output, proper operation of said digital filter being disturbed by transient signals occurring near the beginning of horizontal trace;a digital to analog converter for converting said supplied output to an analog convergence correction signal, said digital to analog converter having an operating frequency and generating a transient signal during horizontal retrace as said operating frequency increases due to an increased horizontal scanning rate;a low pass filter coupled for receiving said analog convergence correction signal and generating an analog deflection signal;an auxiliary deflection coil driven by said analog deflection signal; and,means for switching said digital filter off during said horizontal retrace,whereby said digital filter is protected from disturbance by said transient signal and said digital to analog converter is protected from exceeding a maximum operating frequency.