While working as a postdoc at Bell Laboratories, Lucent Technologies and, later, Media Signal Processing Research, Agere Systems I made a number of acoustical measurements in the varechoic chamber, which is a unique facility at Bell Labs. As there has been many requests, a fraction of the data is now available on these pages.

A picture of the room and the set up is shown below. The linear uniform 22-channel microphone array is placed close to the north wall of the varechoic chamber in front of the pink fiber glass pillow. More pictures can be seen here.



 In this data we have impulse responses measured from 31 loudspeaker positions to all the microphones. In this subset of data the percentage of open panels on the walls of the chamber was 89% which corresponds to a T60 reverberation time of 0.28 seconds. The positions are illustrated below in a figure which was produced in Matlab using the script var89.m. This script also gives detailed locations of loudspeakers and microphones in millimeters so that the origin is north-west floor corner of the chamber and also tells more about transducers used in the measurement.
 

All impulse responses were computed using a logarithmic sweep excitation (65536 samples) at the sampling rate of 48kHz. Impulse responses are stored as 22-channel WAVE files. The whole set of 31 22-ch. wave files is available as a tarred and gzipped archive here .

I would like to thank Mr. Bob Kubli for help in building the array and wiring it to the Lake Huron measurement system.