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NTi Audio TalkBox

The TalkBox is an acoustic signal generator for speech intelligibility measurements in evacuation and announcement systems, as well as for level alignment of teleconference and other audio systems. It allows for the complete end-to-end evaluation of the speech intelligibility STI-PA from the talker’s microphone to the listener’s ears. The TalkBox provides the test signal simulating a human talker at 60 dBA @ 1 meter according to IEC 60268-16.

The TalkBox features human head-like dimensions and is based on a solid-state-generator. It replays the STI-PA test signal at the precisely correct playback sampling rate, also ensuring best performance through the internal amplifier and the precision loudspeaker. A variety of supplied or user-defined test signals may be precisely output for different alignment applications.


NTi Audio TalkBox Features


Individually Equalized

NTi Audio TalkBox includes a precise broadband loudspeaker. Perfect flatness of ±1 dB over the relevant frequency range and highest quality requirements are guaranteed by an individual equalization and calibration using advanced FIR filtering and DSP technology. The radiation characteristic complies with ITU-T P.51 in wide ranges.


Adjusted Output Level

The IEC 60268-16 standard specifies a sound pressure level for a speaker simulator of 60 dBA in 1 meter distance. The TalkBox output levels are calibrated to comply with this standard. To avoid operating failures the TalkBox has no volume control.


Lombard Effect

The human voice tends to be raised in level in emergency situations. In order to cope with this so called Lombard effect, all STI-PA related signals are additionally offered at an increased level of 70 dBA at 1 meter.


Balanced Line In / Out

Using the balanced line out, the TalkBox operates as a signal generator. Sampling frequency deviations - a dangerous trap when using portable CD players for STI-PA measurements - are completely eliminated.

Any external signal can be connected to the system using the balanced line input. The applied signal is transparently looped to the line output and processed in the internal DSP in real-time to appear equalized at the speaker.

NTi Audio TalkBox

Head Office - Soseaua Cristianului nr. 11, 500053, Brasov, Romania
Mobil: 0728 289 289 / 0755070939
Tel/fax: +4 0268 331 410 / +4 0268 332 230

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