Electroacoustic measurements

ISVR Consulting has extensive test facilities including Anechoic rooms and a Loudspeaker Listening Room. We also have a well equipped laboratory for electroacoustic test measurements on loudspeakers, microphones, headsets, headphones, telephones, handsets, alarm sounders, electronic sirens, pagers, ear-inserts and hearing aids. We also carry out direct speech intelligibility measurements of communications systems, and determine objective measures of intelligibility such as Articulation Index and the Rapid Speech Transmission Index (RASTI).

Loudspeaker tests

Sensitivity
Swept-tone frequency response
Harmonic and Intermodulation distortion
Pink noise / third octave frequency response
Polar responses and directivity
Electrical Impedance plots

Microphone tests

Sensitivity
Noise floor
Swept-tone frequency response
Harmonic and Intermodulation distortion
Pink noise / third octave frequency response
Polar response and directivity
Electrical Impedance plots
Noise-discrimination of close-talking microphones
Specialist measurements for cockpit voice recorder microphones to Eurocae specification

Headset tests

Earphone frequency response, sensitivity and distortion measurements on artificial ears, ear simulators or a Kemar manikin..
Undisturbed field equivalent levels of earphone output for estimation of noise exposure and hearing damage risk. See our page Headphones and noise exposures
Microphone frequency response, sensitivity, distortion, noise discrimination and electrical impedance measurements.

Communications systems

Measurement of speech intelligibility, using panels of volunteer listeners. Previous projects include the assessment of interference to Private Mobile Radio, assessment of military communications systems
Assessment of Articulation Index, eg for aircraft or helicopter PA systems
RASTI (Rapid Sound Transmission Index) measurements for aircraft passenger public address and other PA systems.
Measurement of the noise reduction from Active Noise Reduction (ANR) headsets and helmets

If you require any further information please contact:

Mike Lower
ISVR Consulting
University of Southampton
Highfield
Southampton
SO17 1BJ
UK

Email consultancy@isvr.co.uk