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TBU
Telephone Balance Unit. This is a unit that connects the telco unit to the
telphone line ( a two wire to four wire convertor ).
T/B
Talk-back ( and reverse talk-back ). This is the ability for two or more
studios to communicate with each other off-air.
Telco
Telephone Communication. The telco module is used by the presenter to
talk to telephone callers.
THD
The Total Harmonic Distortion is the percentage presence of signals outside
the measured reference frequency.