Master control

A transmission control room (TCR) is usually smaller in size and is a scaled down version of centralcasting.

Television master control rooms include banks of video monitors, satellite receivers, videotape machines, video servers, transmission equipment, and, more recently, computer broadcast automation equipment for recording and playback of television programming.

Master control operators are responsible for monitoring the quality and accuracy of the on-air product, ensuring the transmission meets government regulations, troubleshooting equipment malfunctions, and preparing programming for playout.

Regulations include both technical ones (such as those against over-modulation and dead air), as well as content ones (such as indecency and station ID).

An example of this centralized broadcast programming system on a large scale is NBC's "hub-spoke project" that enables a single "hub" to have control of dozens of stations' automation systems and to monitor their air signals, thus reducing or eliminating some responsibilities of local employees at their owned-and-operated stations.