Audioscan Verifit User Manual
Page 146
2.2.2
Dual-direction pink noise signal (Verifit only)
This unique test signal is available in the dual-source
Verifit test chamber and for on-ear measurements by
adding an additional sound-field speaker. It is similar
to the pink noise signal described previously except
that the component tones are presented simultane-
ously from two speakers, half from each. The spec-
trum of the tone complex from each speaker is in-
dependently controlled with 1/12 octave resolution
at the reference microphone. Two simultaneous re-
sponse curves – one for each speaker – are derived
from the measured output of the hearing aid. This
provides a real-time measure of the functioning of the
directional features of hearing aids that is indepen-
dent of compression or noise reduction algorithms,
unlike other methods that sequentially measure re-
sponse from different directions and work only with
these features disabled.
09/01/29 © Etymonic Design Incorporated, 20 Ludwig St., Dorchester, ON, Canada N0L 1G4
USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com
3