The theory and the design of a logarithmically spaced microphone array
with a spatial filtering capability are presented. The spatial filter
ing reduces the effects of reverberation and interfering noise sources
that degrade the quality of sound pickup in teleconference systems. T
his feature is a result of the array's ability to discriminate against
sound arrivals from all directions except that of the desired source.
Computer simulation results are presented which demonstrate the valid
ity of the new proposed technique. Experimental measurements made in c
onference rooms with a prototype microphone array are shown to compare
satisfactorily with the simulation results.