Sony MDR-NC500D Operating Instructions Manual page 19
Noise-canceling headphones
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Also See for MDR-NC500D:
- User manual ,
- Product information (88 pages) ,
- Servise manual (38 pages)
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[Sony's conventional method]
Noise before
Wearing (ON)
wearing
----. Frequency
I
Noise canceling ratio = Difference between ON and OFF
Largest value (one point)
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[Total Noise Suppression Ratio (TNSR)]
----. Frequency
Total Noise Suppression Ratio = Difference in noise energy
when not wearing the
headphones and when the
Noise Canceling function is
active.
[Example of notation]
TNSR: 20 dB
Total Noise Suppression Ratio (typical values)
Unit: dB
Airplane
Train/Bus
Office
NC MODE A
20.0
18.0
17.1
NC MODE B
17.0
20.3
18.3
NC MODE C
14.9
15.0
18.9
• Based on Sony's one noise source simulations.
• Note: Noise canceling ratio (Sony's conventional method) more than 25 dB (at MODE A)
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