Sony MDR-NC500D - Manual (Page 15)

15 GB
GB
[Example of notation]
TNSR: 20 dB
[Sony’s conventional method]
Noise canceling ratio = Difference between ON and OFF
Largest value (one point)
Sound pressure
Frequency
Wearing (OFF)
Wearing (ON)
Noise before
wearing
[Total Noise Suppression Ratio (TNSR)]
Sound pressure
Total Noise Suppression Ratio = Difference in noise energy
when not wearing the
headphones and when the
Noise Canceling function is
active.
Frequency
Total Noise Suppression Ratio (typical values)
Unit: dB
NC MODE A
NC MODE B
NC MODE C
Train/Bus
18.0
20.3
15.0
Office
17.1
18.3
18.9
Airplane
20.0
17.0
14.9
• Based on Sony's one noise source simulations.
• Note: Noise canceling ratio (Sony’s conventional method) more than 25 dB (at MODE A)