DeciBell CalculationsDeciBell Calculations
Arno van Goch wrote:
I'm trying to do additive synthesis based on data I acquired using spectrum analysis on a sample. I've got for example the following data:
|
231Hz at -65dB |
|
408Hz at -50dB |
|
624Hz at -27dB |
624Hz being the loudest frequency. If I run these frequencies through a 3-input mixer, setting the 624Hz knob to the maximum, is there a way to calculate the exact position of the other two knobs?
Chet Singer wrote:
Here is a list I've made of the attenuation curve for the logarithmic knobs. This was done by measuring the levels every 6db, and then performing a piecewise-linear approximation between them. It could be more precise, but it's been good enough for me. Hope this helps.
Level Decibels subtracted
|
127 |
-0 |
95 |
-9.88235 |
63 |
-24 |
31 |
-46.2857 |
|
126 |
-0.285714 |
94 |
-10.2353 |
62 |
-24.6 |
30 |
-47.1429 |
|
125 |
-0.571429 |
93 |
-10.5882 |
61 |
-25.2 |
29 |
-48 |
|
124 |
-0.857143 |
92 |
-10.9412 |
60 |
-25.8 |
28 |
-48.8571 |
|
123 |
-1.14286 |
91 |
-11.2941 |
59 |
-26.4 |
27 |
-49.7143 |
|
122 |
-1.42857 |
90 |
-11.6471 |
58 |
-27 |
26 |
-50.5714 |
|
121 |
-1.71429 |
89 |
-12 |
57 |
-27.6 |
26 |
-51.4286 |
|
120 |
-2 |
88 |
-12.4286 |
56 |
-28.2 |
24 |
-52.2857 |
|
119 |
-2.28571 |
87 |
-12.8571 |
55 |
-28.8 |
23 |
-53.1429 |
|
118 |
-2.57143 |
86 |
-13.2857 |
54 |
-29.4 |
22 |
-54 |
|
117 |
-2.85714 |
85 |
-13.7143 |
53 |
-30 |
21 |
-55 |
|
116 |
-3.14286 |
84 |
-14.1429 |
52 |
-30.6667 |
20 |
-56 |
|
115 |
-3.42857 |
83 |
-14.5714 |
51 |
-31.3333 |
19 |
-57 |
|
114 |
-3.71429 |
82 |
-15 |
50 |
-32 |
18 |
-58 |
|
113 |
-4 |
81 |
-15.4286 |
49 |
-32.6667 |
17 |
-59 |
|
112 |
-4.28571 |
80 |
-15.8571 |
48 |
-33.3333 |
16 |
-60 |
|
111 |
-4.57143 |
79 |
-16.2857 |
47 |
-34 |
15 |
-61 |
|
110 |
-4.85714 |
78 |
-16.7143 |
46 |
-34.6667 |
14 |
-62 |
|
109 |
-5.14286 |
77 |
-17.1429 |
45 |
-35.3333 |
13 |
-63 |
|
108 |
-5.42857 |
76 |
-17.5714 |
44 |
-36 |
12 |
-64 |
|
107 |
-5.71429 |
75 |
-18 |
43 |
-36.75 |
11 |
-65 |
|
106 |
-6 |
74 |
-18.5 |
42 |
-37.5 |
10 |
-66 |
|
105 |
-6.35294 |
73 |
-19 |
41 |
-38.25 |
9 |
-67.2 |
|
104 |
-6.70588 |
72 |
-19.5 |
40 |
-39 |
8 |
-68.4 |
|
103 |
-7.05882 |
71 |
-20 |
39 |
-39.75 |
7 |
-69.6 |
|
102 |
-7.41176 |
70 |
20.5 |
38 |
-40.5 |
6 |
-70.8 |
|
101 |
-7.76471 |
69 |
-21 |
37 |
-41.25 |
5 |
-72 |
|
100 |
-8.11765 |
68 |
-21.5 |
36 |
-42 |
4 |
0 |
|
99 |
-8.47059 |
67 |
-22 |
35 |
-42.8571 |
3 |
0 |
|
98 |
-8.82353 |
66 |
-22.5 |
34 |
-43.7143 |
2 |
0 |
|
97 |
-9.17647 |
65 |
-23 |
33 |
-44.5714 |
1 |
0 |
|
96 |
-9.52941 |
64 |
-23.5 |
32 |
-45.4286 |
0 |
0 |