Preface
Broadcast television reception uses the radio spectrum. In the days before digital TV, spots, hash, snowstorms, colour and vision distortion and occasionally complete loss of picture were all symptoms of the same cause – electromagnetic interference. Interference still occurs, but its manifestation on digital pictures is different – pixellation, “blocking” in parts, and complete freezing of the picture are the modern curse, and might perhaps be regarded as more annoying than the analogue effects.
It is irritating for the viewer when the picture flickers or is wiped out during a crucial programme, just as it is irritating for a music lover who has carefully taped an important radio broadcast only to find that the quiet passages are ruined ...
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