Bruel & Kjaer UK Ltd. - PRODUCT NEWS

Brüel & Kjær launches wireless echo speech sound source

Improved speech intelligibility measurements with DIRAC 6 and Echo - performing speech intelligibility measurements is quicker and easier with Bruel & Kjaer’s new, battery-powered speech sound source.

Used in combination with the DIRAC 6 room acoustics software, the new Echo Speech Source Type 4720 enables users to perform speech intelligibility measurements, which meet standards IEC 60268-16 and ISO 3382-3 (open plan offices).

The echo speech source works as a standalone tool with five in-built calibrated signals, which are used by the DIRAC room acoustics software to calculate a range of speech intelligibility parameters, such as STI, STIPA and RASTI based on the impulse response of the room being measured.

Users can measure the speech intelligibility of a sound reinforcement system using an excitation signal, played directly from DIRAC, through the sound device output or from an external device such as a CD or MP3 player.

The Echo/DIRAC combination copes well with high levels of background noise, as the echo speech source uses an intermittent stimulus. The intermittent stimulus consists of a Maximum Length Sequence (MLS) sequence followed by an equally long period of silence. The full stimulus (MLS and silence) is measured in one go. DIRAC then extracts the impulse response and the background noise into two separate channels of a .wav file.

DIRAC is a valuable tool for field and laboratory acoustics engineers interested in measuring room acoustics - and also for researchers and educational institutions. As well as measuring acoustics within any room or space, users can make comparisons between one room and another, validate sound systems and perform scale model measurements.

About Bruel & Kjaer
Brüel & Kjær is a world-leading manufacturer and supplier of sound and vibration solutions for use in a wide range of applications including environmental noise measurements, building acoustics, vibration measurements and quality control for use in the automotive, aerospace and consumer industries, as well as by local authorities. Today Brüel & Kjær has 900 employees and sales offices in 55 countries. Brüel & Kjær is a subsidiary of UK-based Spectris plc. ( Spectris has annual sales of approximately £656m and employs around 6000 people worldwide in its 15 business units.

July 2014

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