| 摘要 |
A waveform correction system using inductance-controllable inductors suitable for use in the horizontal sweep circuits of televisions and computer displays includes a linearity correction coil (18) that is connected in parallel to the horizontal linearity coil (12) of the sweep circuit and used to selectively alter the inductance of the horizontal linearity coil (12) to correct for non-linearities in the horizontal sweep waveform. The linearity correction coil (18) has an input coil (20) cross-coupled to an output coil (22) through a core (24) with the output coil (22) connected in parallel with the horizontal linearity coil (12). The input coil (20) is connected between a control node (26) and circuit ground. A controller (28), in the form of a programmed microprocessor, PLA, or similar device, includes a memory (32) into which digital correction factors are stored as a function of the forward left-to-right scan position of the electron beam as it sweeps from the left side to the right side of the display screen. As the electron beam sweeps left to right, a control current through the input coil (20) of the linearity correction coil (18) effects waveform correction.
|
