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audiodsp | ISO Centre frequencies
https://www.dsprelated.com/showthread/audiodsp/479-1.php#:~:text=The%20ISO%20standard%20%28for%20which%20I%20have%20forgotten,what%20you%20should%20use%20to%20be%20industry%20standard.
ISO 11452-10 Immunity Test Equipment to Audio Frequencies ...
https://www.theemcshop.com/428-iso-11452-10-immunity-test-equipment-to-audio-frequencies
ISO 11452-10 Immunity to Audio Frequencies. The EMC Shop specializes in automotive radiated and conducted emissions and susceptibility testing. Rent, buy or lease ISO 11452-10 Immunity Test Equipment to Audio Frequencies. Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 10: Immunity to …
Preferred octave frequency bands according to the ISO ...
https://www.researchgate.net/figure/Preferred-octave-frequency-bands-according-to-the-ISO-standard-61_tbl1_302067841
... designs usually have 30 bands ranging from 25 Hz to 20 kHz. These frequencies, shown in Tables 1 and 2, are standardized by the ISO (International Standards Organization) [61].
Chart Created by JdB Sound Acoustics
https://www.jdbsound.com/art/frequency%20wave%20length%20chart%202013.pdf
5000 0.23 2.7 0.06 0.68 iso 88ºf 93.92 6300 0.18 2.14 0.04 0.54 iso 88ºf 118.34 8000 0.14 1.69 0.04 0.42 iso 88ºf 150.28 10000 0.11 1.35 0.03 0.34 iso 88ºf 187.85 12500 0.09 1.08 0.02 0.27 iso 88ºf 234.81 16000 0.07 0.84 0.02 0.21 iso 88ºf …
audiodsp | ISO Centre frequencies
https://www.dsprelated.com/showthread/audiodsp/479-1.php
The ISO standard (for which I have forgotten the number) defines what they call PREFERRED frequencies, which are close but are rounded up or down to more convenient values. For 1/3rd Octave spacing this is 20Hz, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250 etc. to 20kHz That is what you should use to be industry standard.
Octave-Band Center Frequencies - Engineering
https://www.cross-spectrum.com/audio/articles/center_frequencies.html
The basis of audio fractional octave bands is a frequency of 1000Hz. There are two ISO and ANSI approved ways in which the exact centrefrequencies may be found. The method you refer to is the base2 methodwhere the ratio between 2 exact centre frequencies is given by 21/Nwith N as 3 for 1/3 octaves and so on.
Tech Stuff - Equalization (EQ), Metering and the FFT
http://www.zytrax.com/tech/audio/equalization.html
Base Frequency: Band 30 (1,000 Hz or 1 KHz) is the base frequency for the ISO (and ANSI, BSI etc) Octaves rather than the, perhaps, more obvious 1 Hz starting point. The reason being that frequencies around the 1 KHz range (~400 Hz to ~5 Khz) are more sensitive acoustically and therefore require the greatest accuracy.
Conversion of Frequency Data to the ISO R Preferred ...
http://cjs-labs.com/sitebuildercontent/sitebuilderfiles/ISORConversion.pdf
% ISO R Series preferred frequency format from a delimited ASCII file in % another frequency format. The frequency range is limited to the range % from 1 Hz to 100 kHz. The conversion is performed as straight-line % interpolation on a semi-log axes, i.e. a log frequency axis. This % conversion can be applied to magnitude or phase data. %
This is a preview - click here to buy the full …
https://webstore.iec.ch/preview/info_isoiec13818-3{ed2.0}en.pdf
This allows corresponding audio bandwidths of approximately 7,5 kHz, 10,3 kHz and 11,25 kHz. The syntax, semantics, and coding techniques of ISO/IEC 11172-3 are maintained except for a new definition of the sampling frequency field, the bitrate index field, and the bit allocation tables.
Isochronic Tones Sound Generator • Online & Free
https://mynoise.net/NoiseMachines/isochronicBrainwaveGenerator.php
Brainwave frequencies are in the range of 0.1 to 4 (Delta), 4 to 7 (Theta), 7 to 13 (Alpha) and 13 to 30 (Beta) cycles per second (Hz). Brainwave entrainement (or synchronization), aims to cause our brainwave frequencies to fall into step with a periodic stimulus having a frequency corresponding to the intended brain-state.
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