THE AUDITORY MODELING TOOLBOX
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CQDFT - FFT-based filter bank with constant relative bandwidth according
Usage
[cqmag] = cqdft( insig ) [cqmag,fc,cqmaghr,fvec] = cqdft( insig,fs,flow,fhigh,bw )
Input parameters
| insig | Impulse response or complex spectrum |
| fs | Sampling rate, default is 48kHz. |
| flow | Lowest frequency, minimum: 0.5kHz, default is 2kHz |
| fhigh | Highest frequency, default is, default is 16kHz |
| bw | bandwidth, possible values 3,6,9,12, default is 6. |
Output parameters
| cqmag | mean magnitudes of CQ-bands in dB |
| fc | center frequencies of bands (geo. mean of corners) |
| cqmaghr | same as cqmag but for all freq. bins (high resolution) |
| fvec | freq. vector according to FFT-resolution |
Description
cqdft(insig) approximates a constant-Q filter bank by averaging the magnitude bins of a DFT. cqdft results in 'bw' dB-magnitudes per octave.
References:
E. Langendijk and A. Bronkhorst. Contribution of spectral cues to human sound localization. J. Acoust. Soc. Am., 112:1583-1596, 2002.
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