Additionally, AURICAL Aud includes a feature which allows the operator to select the maximum output level from a bone
oscillator . Using this feature, the maximum output may be set lower than the physically available output level (installation
option).
As the maximum available output level will result in significant distortion from the bone oscillator , the specification below
limits the speech output level to 60 dBHL. Typical distortion levels (median values of a sample of bone oscillator ) are indic-
ated in the following table.
Total harmonic distortion (THD), %
Speech hearing level (dBHL) -> 60 50 40 30
Frequency below (Hz)
250 34,7 13,7 4,4 2,2
500 3,7 1 0,3 0,2
1000 2,6 0,9 0,3 0,3
Frequency response
Frequency
(Hz)
Nominal response level
(dB re. 1kHz level)
Tolerance
(dB)
250 -1.5 ±4
500 6.5 ±4
750 1.0 ±4
1000 0.0 0
1
1500 1.5 ±4
2000 -6.5 ±4
3000 -15.5 ±4
4000 -11.0 ±6
Operator accessories
Operator monitor headset - headphones:
• 40 mW 16 Ω
• 3.5 mm (1/8 inch) stereo jack
Operator microphone (desktop or boom): • Electret microphone
• Input voltage: 0.002 to 0.02 Vrms,
• Input resistance: 2.21 kΩ.
• 3.5 mm (1/8 inch) jack
Otometrics - AURICAL Aud
27
17 Technical specifications
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