Microphone location effects, Deep insertion compensation – Audioscan Verifit 2 User Manual
Page 70
Verifit
®
User's Guide Version 4.2 © June 2015
1/3 octave band SPL
Add to band SPL for
Speech
Hz
Calibrated
Female
Child
ICRA
Noise
Pink
Noise
Loud
Own
Voice
FM
Chest
FM
Boom
200
57.6
54.6
39.4
53.3
52.2
9.6
-3.0
6.3
16.5
250
56.3
53.7
52.7
55.4
52.2
10.7
3.1
11.7
21.9
315
53.5
49.7
56.5
55.9
52.2
10.9
9.1
16.5
25.5
400
57.1
55.4
54.1
57.4
52.2
10.0
6.0
13.5
22.7
500
57.1
57.2
55.1
57.3
52.2
10.1
8.6
13.8
26.2
630
55.8
58.0
60.6
55.1
52.2
10.5
11.6
21.4
28.3
800
53.4
54.8
56.2
52.3
52.2
10.8
13.5
26.0
31.2
1000
49.7
52.3
53.4
50.4
52.2
10.1
16.3
26.9
34.0
1250
47.7
50.6
45.1
48.5
52.2
4.4
17.7
22.2
36.4
1600
47.1
52.0
41.7
46.5
52.2
4.2
16.4
22.2
34.8
2000
44.2
50.7
39.3
44.3
52.2
5.9
17.0
20.9
33.8
2500
42.7
48.7
35.2
41.9
52.2
5.6
16.1
18.2
33.2
3150
42.1
48.0
30.0
40.5
52.2
1.7
14.9
13.8
30.8
4000
40.7
40.8
3105.0
38.7
52.2
-0.6
14.5
12.2
30.3
5000
40.0
36.0
30.7
36.8
52.2
-1.1
9.2
13.0
27.8
6300
40.6
40.9
33.1
35.0
52.2
-0.2
5.1
11.3
27.1
8000
40.3
39.6
34.9
33.1
52.2
-3.8
3.9
11.9
27.7
10000
40.4
28.0
34.1
31.4
52.2
-7.1
2.3
10.7
26.5
12500
38.2
22.6
31.3
29.9
52.2
-10.6
3.1
9.7
25.5
Overall
65
65
65
65
65
75
75
84
93
The above values may differ slightly from previous software versions due to reanalysis of all stimuli and
modifiers using newer equipment and analysis software.
Microphone location effects
Microphone location effects (MLE) for BTE, ITE, ITC and CIC aids were measured in an anechoic chamber on
a KEMAR manikin relative to a microphone location on the cheek below the earlobe. The MLEs in the
following table are added to the stimulus after the overall rms level has been set.
Deep insertion compensation
The deep insertion of a hearing aid or ear-mold causes the ear canal SPL to be higher than would be estimated
by adding and RECD or WRECD to the coupler SPL measured in the test box. This most commonly occurs with
Completely-in-Canal (CIC) hearing aids. When this hearing aid type is selected in Speechmap Test box, a deep
insertion factor is automatically added to the estimated ear canal SPL. The factor in the following table is from
DSL 5.0 and has been interpolated to 1/3 octave frequencies and extrapolated for frequencies above 6 kHz.
70