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Bass / Treble Shelving Filter

by Jeff Tackett

25 Sep 2007 (Updated 26 Sep 2007)

Code covered by BSD License

Generates coefficients for a 2nd order IIR digital filter

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File Information

Description

Derive coefficients for a shelving filter with a given amplitude and cutoff frequency. All coefficients are calculated as described in Udo
Zolzer's DAFX book (p. 50 -55).

Usage: [B,A] = shelving(G, Fc, Fs, Q, type);

            G is the logrithmic gain (in dB)
            FC is the center frequency
            Fs is the sampling rate
            Q adjusts the slope be replacing the sqrt(2) term
            type is a character string defining filter type
                 Choices are: 'Base_Shelf' or 'Treble_Shelf'

Typically this filter is used for multi-band equalization of audio. For example a 3-band equalizer (Bass/Mid/Treble) might use:

Bass = Bass shelving Filter
Mid = Peaking Filter
Treble = Treble shelving Filter

MATLAB release

MATLAB 7.3 (R2006b)

Tags for This File
Everyone's Tags	audio processing, bass shelf, eq, equalization, shelving iir filter, treble shelf, video processing
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Comments and Ratings (1)
04 May 2009	Andrey Krishkevich

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Tag Activity for this File
Tag	Applied By	Date/Time
audio processing	Jeff Tackett	22 Oct 2008 09:28:15
video processing	Jeff Tackett	22 Oct 2008 09:28:15
bass shelf	Jeff Tackett	22 Oct 2008 09:28:15
equalization	Jeff Tackett	22 Oct 2008 09:28:15
shelving iir filter	Jeff Tackett	22 Oct 2008 09:28:15
treble shelf	Jeff Tackett	22 Oct 2008 09:28:15
eq	Jeff Tackett	22 Oct 2008 09:28:16

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