video corpo

sound source
4720 Bruel and Kjaer

Add to MyDirectIndustry favorites
sound source sound source - 4720


A sound source delivering a calibrated signal to measure a range of speech intelligibility parameters.

In combination with DIRAC 6, the Echo Speech Source quickly and easily performs speech intelligibility measurements in accordance with IEC 60268-16. Impulse response and background noise are measured in one pass using intermittent MLS (Maximum Length Sequence) stimulus followed by an equally long period of silence.

Speech intelligibility measurements with DIRAC
Measurements including background noise

With a calibrated speech source there is no need for external equalizers or speech level adjustment. The signal can be set at an elevated level, making STI (speech transmission index) measurements possible even if the background noise is significant. DIRAC 6 recognizes the output level and corrects calculations appropriately.

Echo Speech Source can be used to set the volume of PA systems using a male speech signal with a standard level of 60 dB(A) at 1 meter. For STI measurements, it contains pink MLS signals. The MLS is far less intrusive than an e-sweep signal.

Wireless sound source for DIRAC 6
Calibrated speech levels and spectra
Mouth directivity
Five built-in stimulus signals
Intermittent stimulus accounting for background noise
External input and output
Compact and lightweight (10x10x17 cm, 1 kg)
Mounts on standard tripods
Battery powered
External power supply included

Other Bruel and Kjaer products

Acoustic Transducers