| 摘要 |
A circuit of high and low frequency quadrature networks and additive amplifiers for generating an annular scansion pattern in a CRT employed in a closed circuit television system; the scan pattern being generated by combining alternate quadrature components of two voltages of different frequencies for application to the horizontal and vertical deflection plates of the CRT, the scan pattern being characteristic of a spring coil bent along the path of a base frame frequency circle.
|
