Interpretation
Although Close Talk Conference System is primarily a one-language system, it is possible to do dual language, so called 1+1 language, using an external PA system:
The microphone signals from the Delegate Units are sent to the PA and the interpreter where the PA is the main sound reinforcement for the users. The interpreter language is sent to the Central Unit Line In audio input and then out to the Delegate Unit receivers. Only the interpreter signal is sent so the delegates can listen to the interpreted language using the headphones outputs on the Delegate Unit and the main language via the PA sound.