Synchronisation
The television picture is scanned systematically in a series of parallel lines. Each picture is actually covered in two successive scanning patterns (odd and even fields), which are automatically interlaced to form a fully scanned picture (frame).
The television pick-up device generates the picture information on a line-by-line basis. At the end of each line, the scanning spot flies back to begin the next. This continues until a complete field has been scanned, when the scanning spot returns quickly to the top of the picture to commence the next field. To ensure that this scanning process is carried out with precision, and the entire TV system is synchronised from camera to receiver, special ‘sync’ pulses are generated to initiate ...
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