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.

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