Manual

126

STIPA

STIPA with Ambient Noise Correction

Measuring the speech intelligibility index under realistic en-

vironmental conditions is often not feasible; e.g., playing the

test signal in a railway station at emergency levels during peak

hours will irritate passengers. Additionally, at rush-hour the

characteristics of ambient noise might be highly impulsive,

while a pre-requisite for accurate STIPA measurements is a

negligible impulsivity in the ambient noise. Under such circum-

stances the STIPA measurement should be shifted to a more

suitable time of the day; e.g. night time.

Measurement Sequence

First measure the ambient noise•

Secondly measure the speech intelligibility STIPA•

This sequence simpliﬁes the STIPA measure-

ment as follows: The XL2 immediately displays

the STIPA result with ambient noise correction.

This result provides a guideline if repeated mea-

surements at the same location with averaging

is required. For details see the chapter STIPA

Measurement Hints.

Enable Ambient Noise Correction

Select the correction page • Cor.

Turn the rotary wheel •

to select the parameter Ambient

Noise Correction and press enter

 The correction enables and the XL2 displays this screen: