| 摘要 |
Electrical waveforms of arbitrary shape are generated by pulsing a delay line and taking a signal from the line via conductive strips of varying width mounted parallel to the line and capacitively coupled to it. The signal variation with time corresponds to the variation of effective capacitance as the energizing pulse is propagated along the delay line. With strips suitably contoured, the waveforms may be applied to the orthogonal deflecting electrodes of a cathode ray tube to trace any desired character on the tube screen. For example, a font of 96 characters can be made available with three delay lines carrying strips formed by printed circuit techniques and controlled by relatively simple selection circuits. Described sampling techniques permit indefinite expansion of the time base of developed waveforms.
|
