In sound recording, talkback refers to the intercom system used in recording studios to enable personnel in the control room to speak or give instructions to personnel in the recording area or booth. While the control room can hear the booth over the studio microphones, the booth hears the control room over a PA or monitor speaker, or in their headphones.
For communicating the instructions of the director instantly to all those concerned in making the programme; these include presenters, interviewers, cameramen, sound operators, lighting operators and engineers. A number of talk-back channels may be in simultaneous use to cover those different activities. Talk-back usually employs constant transmission.
Source: ECC REPORT 2 [730 KB]