Sound and Vibration Instrument Hire and Calibration
NTi Audio : TalkBox - STIPA Reference
|NTi Audio : TalkBox - STIPA Reference Acoustic Generator||£ 6 a day *|
The TalkBox is an acoustic signal generator for Speech Intelligibility Measurements in evacuation and announcement systems, as well as for level alignment of teleconference or other audio systems. It allows performing the complete end-to-end evaluation of the speech intelligibility STIPA from the talker’s microphone to the listener’s ears.
Individually Equalised : NTi Audio TalkBox includes a high-precision broadband loudspeaker. Perfect flatness of ±1 dB over the relevant frequency range and highest quality requirements are guaranteed by an individual equalisation 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 BS EN 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.
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 STIPA 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 equalised at the speaker.
Different Test Signals : The TalkBox also generates additional wave forms: White noise, pink noise, sine wave, reference speech signals and the delay time measurement chirp. Custom designed signals may be loaded onto the CF Card and are seamlessly looped.
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 cell phone controlled ON/OFF functionality. Thus the STIPA test signal might be muted between measurements.
Universal Power Supply : The TalkBox supports a power supply range 10 - 18 VDC. An external power supply for worldwide operation is included. Alternatively the optional battery pack might be used.