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Article #982Re: What transform to use to get good audio spectra?
From: Tom Anderson
Date: Mon, 08 Oct 1990 23:03
Date: Mon, 08 Oct 1990 23:03
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1348 bytes
> I'd like to see into audio data (50 kHz sampling rate) with qood resolution > in frequency. While the normal Fourier methods give easily very good results > in the high end of the spectrum, the low frequency resolution is very poor. > (Audio data is presented with a logarithmic scale. For example 1024 point I asked a similar question a while back and got this excellent reply: Try looking at "An Algorithm and Architecture for Constant-Q Spectrum Analysis," by Gary W. Schwede. "Q" refers to the ratio of bandwidth to frequency, sometimes called the "quality" of a filter. Constant Q <==> logarithmic frequency. The paper is in the Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), April 1983, pp. 1384-1387. Tom Anderson toma@hpsad.hp.com "It's only hardware"
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!dali.cs.montana.edu!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpl-opus!hpnmdla!hpsad!toma From: toma@hpsad.HP.COM (Tom Anderson) Newsgroups: comp.dsp Subject: Re: What transform to use to get good audio spectra? Message-ID: <9520015@hpsad.HP.COM> Date: 8 Oct 90 23:03:07 GMT References: <1990Oct1.130615.5802@funet.fi> Organization: HP Signal Analysis Division - Rohnert Park, CA Lines: 19