NICAM STEREO SOUND
Two alternative systems are available in the UK for sound with analogue terrestrial TV transmissions. The longest established is f.m. mono, with a single sound channel on a 6 MHz (system I, UK) or 5.5 MHz (systems B, G) carrier, intercepted by a narrowband ceramic filter and treated the same as in an f.m. radio receiver. An alternative and better system, Nicam, is available with many transmissions, carried alongside the mono f.m. signal which is retained for compatibility.
OVERVIEW
The Nicam system is a digital one, with data conveyed in phase modulation of a low-level carrier, spaced for system I at 6.552 MHz above the vision carrier. The modulation system adopted is DQPSK (Differentially encoded Quadrature Phase-Shift ...
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