Digital device for correcting the image formed on the screen of a cathode ray tube

摘要

Device for correcting the line and/or frame fields of a deflector for cathode ray tube comprising: a current sensor for evaluating the value of a line current Il a series of comparators intended to compare the value of the line current Il with reference values a current sensor for evaluating the value of the frame current It an analogue/digital converter for converting the analogue value of the frame current a programmed correction memory which is addressed by the output signals from the comparators and from the analogue/digital converter so as to deliver to at least one digital/analogue converter, data which are dependent on the addressing signals a low-pass filter for filtering the output of the digital/analogue converter at least one correction coil for correcting the deflection fields of the deflector, and generating a correction field as a function of the output value from the low-pass filter.