The Hit440 Test Signal Characteristics - Interacoustics Affinity 2.0 Additional Information

3.12 Appendix 1

3.12.1 The HIT440 test signal characteristics

Pure Tone f requency accuracy is ±1%. Crest f actor is 3 dB.
Warble Tone f requency accuracy is ±1%, warble f requency 0100 Hz and intensity 010%, sine wave
f requency modulation. Crest f actor is 3 dB.
Random Noise is a noise with a linear spectrum measured with an FFT or a 3 dB drop per octave measured
with a 1/3 octave f ilter.
Pseudo random noise. is a semi-broad-band noise produced f rom random noise weighted with a 2nd order
200 Hz high pass f ilter and a 1st order 900 Hz low pass f ilter as described in the ANSI S3.42 -1992 standard.
Crest f actor is 10 dB.
Chirp. Is a linear f requency sweep f rom 100 to 10 kHz in 23 mS = one FFT measuring. The amplitude is
constant during the sweep. Crest f actor = 3 dB.
Band limited white noise is a random noise signal band limited by 12 kHz 2. order low pass f ilter. Crest
f actor is 9 dB.
PinkNoise is a noise with a linear spectrum measured with a 1/3 octave f ilter or a 3 dB rise per octave
measured with an FFT.
ICRA Noise:
ICRA: urgnmn
Unmodulated random Gaussian noise - Male weighted - Normal ef f ort - Level Ref . Crest f actor = 13
dB.
ICRA: urgnmr
Unmodulated random Gaussian noise - Male weighted - Raised ef f ort - Level Ref +5.7dB. Crest f actor
= 14 dB.
ICRA: urgnml
Unmodulated random Gaussian noise - Male weighted - Loud ef f ort - Level Ref +12.1 dB. Crest f actor
= 14 dB.
ICRA: 3bsmnfn
3 Band speech modulated noise (3bSMN) - Female weighted - Normal ef f ort - Level Ref . Crest f actor
= 27 dB.
ICRA: 3bsmnmn
3 Band speech modulated noise (3bSMN) - Male weighted - Normal ef f ort - Level Ref . Crest f actor =
27 dB.
ICRA: 2pb1f1mn
2 persons babble, 1f emale 3bSMN + 1 male 2bSMN - Idealized - Normal ef f ort - Level Ref + 3dB.
Crest f actor = 24 dB.
ICRA: 6pbn
6 persons babble, 1f +1m+2f (-6db)+2m(-6dB), all 3bSMN - Idealized - Normal ef f ort - Level Ref +
4.7dB. Crest f actor = 23 dB.
ICRA: 6pbr
6 persons babble, 1f +1m+2f (-6db)+2m(-6dB), all 3bSMN - Idealized - Raised ef f ort - Level Ref +
10.7dB. Crest f actor = 24 dB.
ICRA: 6pbl
6 persons babble, 1f +1m+2f (-6db)+2m(-6dB), all 3bSMN - Idealized - Loud ef f ort - Level Ref + 17.2dB.
Crest f actor = 25 dB.
Speech Dialog Crest f actor = 24 dB.
Speech Femal Crest f actor = 20 dB.
Speech Male Crest f actor = 25 dB.
Sound File this crest f actor is not known.
D-0004576-Q – 2022/05
Affinity/Equinox2.0 – Additional Information
Page 351