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Phantom circuit
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==Carrier circuit phantoms== From the 1950s to around the 1980s, using phantoms on [[Balanced line#Star-quad|star-quad]] trunk carrier circuits was a popular method of deriving a high quality broadcast audio circuit. The multiplexed [[Frequency division multiplexing|FDM]] telecommunications carrier system usually did not use the [[baseband]] of the cable because it was inconvenient to separate low frequencies with filters. On the other hand, a one-way audio phantom could be formed from the two pairs (go and return signals) making up the star-quad cable.
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