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数字视频与模拟电视 电视是多维信息,对于黑白电视,是三维信息f(x,y,t),而且,它在垂直方向取样(用行频取样),在时间轴方向取样(用场或帧频率取样)把连续信息变成离散信息。用周期性的电视扫描实现把三维信息变成一维时间信息。这个一维连续的电视信号是以行频为周期的时间信号。其幅度反映每行扫描线上黑白亮度的变化。由于幅度值在0V到1V之间连续变化。我们把这种信号叫模拟电视信号,传送和处理模拟电视信号的电视叫模拟电视。如果对电
Digital television and analog television television are multidimensional information and, for black and white television, are three-dimensional information f (x, y, t) and are sampled vertically (sampled with line frequency) and sampled in the time axis direction Sampling) turns continuous messages into discrete messages. Using periodic television scanning to achieve the three-dimensional information into one-dimensional time information. This one-dimensional continuous television signal is a time signal with a cycle frequency. The magnitude of each line of scanning black and white brightness changes. As the amplitude value continuously varies from 0V to 1V. We call this signal analog TV signals, analog TV transmission and processing of television signals analog TV. If the electricity