
Bone Vibrators - ANSI Speech RETSPL
Transducer
B71
B71
B81
B81
Impedance
50 Ω
50 Ω
10 Ω
10 Ω
Coupler
Mastoid
Forehead
Mastoid
Forehead
RETFL
RETFL
RETFL
RETFL
Speech
Speech Equ.FF.
Speech Non-linear
55
63.5
55
63.5
Speech noise
0
Speech noise Equ.FF.
Speech noise Non-
linear
55
63.5
55
63.5
White noise in speech
57.5
66
57.5
66
•
ANSI Speech level 12.5 dB + 1 kHz RETSPL ANSI S3.6 2010 (acoustical linear weighting)
•
ANSI Speech Equivalent free field level 12.5 dB + 1 kHz RETSPL – (G
F
-G
C
) from ANSI S3.6
2010(acoustical equivalent sensitivity weighting)
•
ANSI Speech Not linear level 1 kHz RETSPL ANSI S3.6 2010 (DD45-TDH50-HDA200-HDA300)
and EAR 3A –IP30- B71-B81 12.5 dB + 1 kHz RETSPL ANSI S3.6 2010 (no weighting)
Bone Vibrators - IEC Speech RETSPL
Transducer
B71
B71
B81
B81
Impedance
50 Ω
50 Ω
10 Ω
10 Ω
Coupler
Mastoid
Forehead
Mastoid
Forehead
RETFL
RETFL
RETFL
RETFL
Speech
Speech Equ.FF.
Speech Non-linear
55
63.5
55
63.5
Speech noise
Speech noise Equ.FF.
Speech
noise
Non-
linear
55
63.5
55
63.5
White noise in speech
57.5
66
57.5
66
•
IEC Speech level IEC60645-2 1993 (acoustical linear weighting)
•
IEC Speech Equivalent free field level (G
F
-G
C
) from IEC60645-2 1993 (acoustical equivalent
sensitivity weighting)
•
IEC Speech Not linear level 1 kHz RETSPL (DD45-TDH50-HDA200-HDA300) and EAR 3A – IP30
- B71- B81 IEC60645-2 1993 (no weighting)