7841 DIRAC

Measuring Room Acoustics

Brüel & Kjær is the sole worldwide distributor of DIRAC, an acoustics measurement software tool, developed by Acoustics Engineering.

DIRAC Room Acoustics Software Type 7841 is used for measuring a wide range of room acoustical parameters. Based on the measurement and analysis of impulse responses, DIRAC supports a variety of measurement configurations.

For accurate measurements according to the ISO 3382 standard, you can use the internally generated MLS (maximum-length sequence) or sweep signals through a loudspeaker sound source. Survey measurements are easily carried out using a small impulsive sound source, such as a blank pistol or even a balloon.

Speech measurements can be carried out in compliance with the IEC 60268-16 standard, for male and female voices, through an artificial mouth-directional loudspeaker sound source or through direct injection into a sound system, taking into account the impact of background noise.

DIRAC is not only a valuable tool for field and laboratory acoustics engineers, but also for researchers and educational institutions.

Uses

• Measurement of the acoustical properties of an enclosure
• Measurement of the speech intelligibility of a sound system
• Characterisation of room acoustics before and after modification
• Comparison of acoustical quality of different rooms
• Modelling room acoustics using measurements taken in a scale model
• Research and education on acoustics
• Troubleshooting room acoustics

Features

• Measures reverberation, spaciousness, speech intelligibility and many other parameters
• Dual input
• Conforms to ISO3382 (room acoustics) and IEC 60268–16 (speech intelligibility) standards
• User-friendly and fast
• Impulse Response editing
• Supports many different types of sources and receivers
• Reverse filtering technique enables accurate short reverberation time measurement
• Multiple time and/or frequency views of the impulse response
• Statistics calculation (mean, standard deviation, min-max)
• Supports scale model measurements
• Soundcard test and validation
• Auto Measure enables a single person to quickly measure large rooms
• Export to ODEON enables convenient comparison of measurement and modelling results
• Multiple groups of measurements can be displayed in a single graph or table