TalkBox

Individually Equalized

The NTi Audio TalkBox includes a high-precision broadband loudspeaker, with characteristic little distortion even at low frequencies. 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 corresponds broadly to the human mouth as defined in the ITU-T P.51 standard.

Adjusted Output Level

The IEC 60268-16 standard specifies a sound pressure level for a speaker simulator of 60 dBA at a distance of 1 meter. The TalkBox output is fixed at these levels to comply with this standard. Thus the TalkBox has no volume control.

Lombard Effect

In an emergency situation, the person making the announcements will tend to talk louder. This is known as the Lombard Effect. The system must be tested at this increased level. All TalkBox STIPA-related signals are thus additionally available at a level of 70 dBA at a distance of 1 meter.

Different Test Signals

The TalkBox also generates additional test signals: a reference spoken sentence, white noise, pink noise, 1 kHz sine wave and the chirp for delay time measurement. Custom-designed signals may be loaded onto the CF Card and are seamlessly looped.

Balanced Line In / Out

Using the balanced line output, the TalkBox can also be operated as an audio signal generator. Frequency deviations while sampling – a dangerous trap when using portable CD players for STIPA measurements – are completely eliminated.

Further, any external signal can be connected to the system using the balanced line input. The applied signal is seamlessly looped to the line output and simultaneously processed in the internal DSP in real-time and played through the speaker.

Remote Mute

For measuring speech intelligibility in large buildings the remote mute functionality of the TalkBox is of great help. Any external switching device may be connected to the mute input, allowing e.g. a mobile phone to control ON/OFF functionality. Thus the STIPA test signal might be muted between measurements.

Mic Stand Mount

Typically the NTi Audio TalkBox is positioned on a conventional mic stand in front of the talker’s microphone; exactly at the position of the actual talking person during the announcements. For this purpose there is a tripod mount on the bottom plate of the TalkBox.