Back Voice Evacuation Design Information

Total Harmonic Distortion (sample data):

Distortion is a key factor in intelligibility. Distortion can be introduced by various components in the voice evacuation system and the effect is cumulative. Systems designed with speakers that have low harmonic distortion, tend to have voice messages that are more intelligible.

Average % THD


SP200
         
  1/4W 1/2W 1W 2W
         
400 Hz       0.245       0.420       0.586       0.686
500 Hz       0.650       0.700       0.943       1.246
632 Hz       0.899       1.263       1.675       2.237
800 Hz       1.089       1.423       1.949       2.555
1000 Hz       0.515       0.508       0.517       0.536
1270 Hz       0.546       0.616       0.714       0.811
1600 Hz       0.463       0.519       0.581       0.712
2000 Hz       0.417       0.456       0.503       0.580
2537 Hz       0.315       0.398       0.523       0.704
3200 Hz       0.702       0.777       0.866       0.996
4000 Hz       0.809       0.874       0.947       0.967
         
Avg.     0.6047     0.7230     0.8912     1.0936

Distortion is a key factor in intelligibility. Distortion can be introduced by various components in the voice evacuation system and the effect is cumulative. Systems designed with speakers that have low harmonic distortion, tend to have voice messages that are more intelligible.