The Hit440 Test Signal Characteristics; Appendix 1 - Interacoustics Affinity 2.0 Additional Information

2.0
Affinity Additional Information
3.12

Appendix 1

3.12.1 The HIT440 Test Signal characteristics

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