Sony MDR-NC500D Product Information page 15

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