NC_Noise_Criterion_Calculation

	A	B	C	D	E	F	G	H	I
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2
3	NC - Noise Criterion Calculation
4	For more info:
5	http://www.engineeringtoolbox.com/nc-noise-criterion-d_725.html
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8		Octave Band Center Frequency (Hz)
9		62.5	125	250	500	1000	2000	4000	8000
10	NC-70	83	79	75	72	71	70	69	68
11	NC-65	80	75	71	68	66	64	63	62
12	NC-60	77	71	67	63	61	59	58	57
13	NC-55	74	67	62	58	56	54	53	52
14	NC-50	71	64	58	54	51	49	48	47
15	NC-45	67	60	54	49	46	44	43	42
16	NC-40	64	56	50	45	41	39	38	37
17	NC-35	60	52	45	40	36	34	33	32
18	NC-30	57	48	41	35	31	29	28	27
19	NC-25	54	44	37	31	27	24	22	21
20	NC-20	51	40	33	26	22	19	17	16
21	NC-15	47	36	29	22	17	14	12	11
22	Measured or Estimated Values	40	50	55	60	50	55	45	45
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