16
Technical Specifications
16.1
MADSEN Astera²
Type identification
MADSEN Astera² is type 1066 from GN Otometrics A/S.
Channels
Two separate and identical channels
Frequency range
TDH39 earphones:
Standard frequencies: 125 - 12500 Hz
HDA 300 earphones:
Standard frequencies: 125 - 20000 Hz
Insert earphones:
Standard frequencies: 125 - 8000 Hz
BC:
Standard frequencies: 250 - 8000 Hz
SF:
Standard frequencies: 125 - 20000 Hz
Tone accuracy:
> 0.03%
FRESH noise stimulus:
Available in entire frequency range within the transducer specified range.(for SF 125
- 12500 Hz). Accuracy 0.3%
Narrow Band Noise masking:
Available in entire frequency range
Frequency resolution:
1/48, 1/24, 1/12, and 1/6 oct, 1 Hz step
Stimulus types
•
Tone
•
Warble
•
Pulsed tone
•
Pulsed warble
•
FRESH noise
Frequency-specific hearing assessment noise.
Consists of noise bands, with frequency-specific filter width.
The FRESH noise is filtered to obtain very steep slopes outside the passband.
•
Pulsed FRESH noise
Masking types
•
Narrow Band Noise
–
AC and BC
–
SF
Correlated
Non-correlated
A
Otometrics - MADSEN Astera²
23
16 Technical Specifications
