The TalkBox as acoustic signal generator provides two major advantages for STI-PA measurements: An extended test coverage and an easy to handle test signal injection. Sampling frequency deviations - a dangerous trap when using portable CD players - are completely eliminated.

The human head sized NTi Audio TalkBox replaces and simulates a real speaker when measuring speech intelligibility. This setup considers the entire signal path for an accurate STI-PA measurement. It includes all effects of the speaker‘s microphone and environment.

Alternatively the signal generator Minirator MR-PRO serves closed evacuation systems without any speaker‘s microphone.

A human speaker commonly repeats the familiar phrases "one, two, test" or "check - check" at setting up microphones for reinforcement- or conference systems. This stimulates the audio system for level checking.

The NTi Audio TalkBox simplifies and improves the setup of microphones. It generates a reference human speech signal or other standard audio test signals, so only one person is required to quickly adjust complete conference systems. Additional test signals support the determination of system flatness and response effects e.g. in teleconference applications.

The TalkBox generates all test signals for professional conference room setup. Typically the TalkBox is positioned at a measured reference point near each speaking position.