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(一)概论和假设 在电视扫描设备中,通常采用指数规律交化的电压(或电流)来代替绝对直线上升的中压(或电流)作扫描电压(电流)。当使用这种电压(或电流,下略)作垂直扫描时,电子射束在垂直方面的移动(偏转)规律即遵守指数规律,因此拍描各行的行距也将相应改交。 在隔行扫描系统中,
(A) Introduction and Assumptions In TV-scanning equipment, exponentially increasing voltage (or current) is usually used instead of an absolute linear rise of medium voltage (or current) as the scanning voltage (current). When using this voltage (or current, omitted) for vertical scanning, the law of the vertical movement (deflection) of the electron beam obeys the exponential law, so the line spacing of the scanning lines will be switched accordingly. In the interlaced system,