getCenterFrequencies
Center frequencies of filters
Description
Examples
Center Frequencies of gammatoneFilterBank
Create a gammatoneFilterBank
and get the center frequencies of the filters in the filter bank.
gammaFiltBank = gammatoneFilterBank; cf = getCenterFrequencies(gammaFiltBank)
cf = 1×32
103 ×
0.0500 0.0822 0.1181 0.1581 0.2027 0.2525 0.3081 0.3700 0.4391 0.5162 0.6022 0.6980 0.8050 0.9242 1.0573 1.2056 1.3711 1.5557 1.7616 1.9912 2.2473 2.5329 2.8515 3.2069 3.6032 4.0453 4.5384 5.0883 5.7017 6.3858 7.1489 8.0000
Center frequencies of a gammatone filter bank are spaced evenly on the ERB scale. Convert the center frequencies vector to the ERB scale and calculate the differences between center frequencies.
diff(hz2erb(cf))
ans = 1×31
1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130 1.0130
Center Frequencies of octaveFilterBank
Create an octaveFilterBank
and get the center frequencies of the filters in the filter bank.
octFiltBank = octaveFilterBank; cf = getCenterFrequencies(octFiltBank)
cf = 1×10
104 ×
0.0032 0.0063 0.0126 0.0251 0.0501 0.1000 0.1995 0.3981 0.7943 1.5849
Center frequencies of an octave filter bank are spaced evenly on a logarithmic scale. Convert the center frequencies vector to the log scale and calculate the differences between center frequencies.
diff(log10(cf))
ans = 1×9
0.3000 0.3000 0.3000 0.3000 0.3000 0.3000 0.3000 0.3000 0.3000
Get Center Frequencies of Octave Filter Bank Used in splMeter
Create an octave bandwidth splMeter
and get the center frequencies of the octave filter bank. Round the center frequencies to two significant digits for display purposes.
SPL = splMeter('SampleRate',44100,'Bandwidth','1 octave'); cf = getCenterFrequencies(SPL); round(cf,2,'significant')
ans = 1×10
32 63 130 250 500 1000 2000 4000 7900 16000
Input Arguments
obj
— Object to get filter bank center frequencies from
gammatoneFilterBank
| octaveFilterBank
| splMeter
Object to get filter bank center frequencies from, specified as an object of gammatoneFilterBank
, octaveFilterBank
, or splMeter
.
Output Arguments
cf
— Filter bank center frequencies (Hz)
scalar | vector
Filter bank center frequencies in Hz, returned a scalar or vector.
Version History
Introduced in R2019a
See Also
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