The simple video signal we started with has turned into a video signal which is really complex. The variations of current strength conveying the picture content are here interwoven with a dense system of pulses, Fig. 30.15(a), all working towards a common aim. If this train of pulses has to be transmitted, a method that suggests itself is to modulate the amplitude of the carrier wave in the rhythm of the pulses.

There will have to be an amplitude detector in the receiver to recover this pulse train from the modulated carrier wave. The detector consists of a simple network that transforms high-frequency electrical waves into a direct voltage. The magnitude of the direct voltage produced always corresponds exactly to the ...

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