| ANSI 3rd Octave, Perrin 48th Octave | ||||||
|---|---|---|---|---|---|---|
| 1 | 15.625 Hz | 49 | ⅓ [ 41 (13.9203Hz) , 57 (17.5385Hz)] | O [ 25 (11.0485Hz) , 73 (22.0971Hz)] | ||
| 2 | 19.6863 Hz | 65 | ⅓ [ 57 (17.5385Hz) , 73 (22.0971Hz)] | O [ 41 (13.9203Hz) , 89 (27.8406Hz)] | ||
| 3 | 24.8031 Hz | 81 | ⅓ [ 73 (22.0971Hz) , 89 (27.8406Hz)] | O [ 57 (17.5385Hz) , 105 (35.0769Hz)] | ||
| 4 | 31.25 Hz | 97 | ⅓ [ 89 (27.8406Hz) , 105 (35.0769Hz)] | O [ 73 (22.0971Hz) , 121 (44.1942Hz)] | ||
| 5 | 39.3725 Hz | 113 | ⅓ [ 105 (35.0769Hz) , 121 (44.1942Hz)] | O [ 89 (27.8406Hz) , 137 (55.6812Hz)] | ||
| 6 | 49.6063 Hz | 129 | ⅓ [ 121 (44.1942Hz) , 137 (55.6812Hz)] | O [ 105 (35.0769Hz) , 153 (70.1539Hz)] | ||
| 7 | 62.5 Hz | 145 | ⅓ [ 137 (55.6812Hz) , 153 (70.1539Hz)] | O [ 121 (44.1942Hz) , 169 (88.3883Hz)] | ||
| 8 | 78.7451 Hz | 161 | ⅓ [ 153 (70.1539Hz) , 169 (88.3883Hz)] | O [ 137 (55.6812Hz) , 185 (111.362Hz)] | ||
| 9 | 99.2126 Hz | 177 | ⅓ [ 169 (88.3883Hz) , 185 (111.362Hz)] | O [ 153 (70.1539Hz) , 201 (140.308Hz)] | ||
| 10 | 125 Hz | 193 | ⅓ [ 185 (111.362Hz) , 201 (140.308Hz)] | O [ 169 (88.3883Hz) , 217 (176.777Hz)] | ||
| 11 | 157.49 Hz | 209 | ⅓ [ 201 (140.308Hz) , 217 (176.777Hz)] | O [ 185 (111.362Hz) , 233 (222.725Hz)] | ||
| 12 | 198.425 Hz | 225 | ⅓ [ 217 (176.777Hz) , 233 (222.725Hz)] | O [ 201 (140.308Hz) , 249 (280.616Hz)] | ||
| 13 | 250 Hz | 241 | ⅓ [ 233 (222.725Hz) , 249 (280.616Hz)] | O [ 217 (176.777Hz) , 265 (353.553Hz)] | ||
| 14 | 314.98 Hz | 257 | ⅓ [ 249 (280.616Hz) , 265 (353.553Hz)] | O [ 233 (222.725Hz) , 281 (445.449Hz)] | ||
| 15 | 396.85 Hz | 273 | ⅓ [ 265 (353.553Hz) , 281 (445.449Hz)] | O [ 249 (280.616Hz) , 297 (561.231Hz)] | ||
| 16 | 500 Hz | 289 | ⅓ [ 281 (445.449Hz) , 297 (561.231Hz)] | O [ 265 (353.553Hz) , 313 (707.107Hz)] | ||
| 17 | 629.961 Hz | 305 | ⅓ [ 297 (561.231Hz) , 313 (707.107Hz)] | O [ 281 (445.449Hz) , 329 (890.899Hz)] | ||
| 18 | 793.701 Hz | 321 | ⅓ [ 313 (707.107Hz) , 329 (890.899Hz)] | O [ 297 (561.231Hz) , 345 (1122.46Hz)] | ||
| 19 | 1000 Hz | 337 | ⅓ [ 329 (890.899Hz) , 345 (1122.46Hz)] | O [ 313 (707.107Hz) , 361 (1414.21Hz)] | ||
| 20 | 1259.92 Hz | 353 | ⅓ [ 345 (1122.46Hz) , 361 (1414.21Hz)] | O [ 329 (890.899Hz) , 377 (1781.8Hz)] | ||
| 21 | 1587.4 Hz | 369 | ⅓ [ 361 (1414.21Hz) , 377 (1781.8Hz)] | O [ 345 (1122.46Hz) , 393 (2244.92Hz)] | ||
| 22 | 2000 Hz | 385 | ⅓ [ 377 (1781.8Hz) , 393 (2244.92Hz)] | O [ 361 (1414.21Hz) , 409 (2828.43Hz)] | ||
| 23 | 2519.84 Hz | 401 | ⅓ [ 393 (2244.92Hz) , 409 (2828.43Hz)] | O [ 377 (1781.8Hz) , 425 (3563.59Hz)] | ||
| 24 | 3174.8 Hz | 417 | ⅓ [ 409 (2828.43Hz) , 425 (3563.59Hz)] | O [ 393 (2244.92Hz) , 441 (4489.85Hz)] | ||
| 25 | 4000 Hz | 433 | ⅓ [ 425 (3563.59Hz) , 441 (4489.85Hz)] | O [ 409 (2828.43Hz) , 457 (5656.85Hz)] | ||
| 26 | 5039.68 Hz | 449 | ⅓ [ 441 (4489.85Hz) , 457 (5656.85Hz)] | O [ 425 (3563.59Hz) , 473 (7127.19Hz)] | ||
| 27 | 6349.6 Hz | 465 | ⅓ [ 457 (5656.85Hz) , 473 (7127.19Hz)] | O [ 441 (4489.85Hz) , 489 (8979.7Hz)] | ||
| 28 | 8000 Hz | 481 | ⅓ [ 473 (7127.19Hz) , 489 (8979.7Hz)] | O [ 457 (5656.85Hz) , 505 (11313.7Hz)] | ||
| 29 | 10079.4 Hz | 497 | ⅓ [ 489 (8979.7Hz) , 505 (11313.7Hz)] | O [ 473 (7127.19Hz) , 521 (14254.4Hz)] | ||
| 30 | 12699.2 Hz | 513 | ⅓ [ 505 (11313.7Hz) , 521 (14254.4Hz)] | O [ 489 (8979.7Hz) , 537 (17959.4Hz)] | ||
| 31 | 16000 Hz | 529 | ⅓ [ 521 (14254.4Hz) , 537 (17959.4Hz)] | O [ 505 (11313.7Hz) , 553 (22627.4Hz)] | ||
| 32 | 20158.7 Hz | 545 | ⅓ [ 537 (17959.4Hz) , 553 (22627.4Hz)] | O [ 521 (14254.4Hz) , 569 (28508.8Hz)] | ||
f3(i) = 1.0e3 .* (2.0).^( (i .- 19) ./ 3.0)
if3(f) = round(Int,19 + 3 * ((log(f) - log(1000.0))/log(2.0)))
f48_const = f3(-2)
f48(i) = f48_const .* (2.0).^( (i - 1) ./ 48.0)
if48(f) = round(Int,1 + 48 * ( (log(f) - log(f48_const) ) / log(2)))