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This function will return a 29-point equal loudness contour for your desired phon level. The frequencies evaulated in this function only span from 20Hz - 12.5kHz, and only 29 selective
frequencies are covered. This is the limitation of the ISO standard.

In addition the valid phon range should be 0 - 90 dB SPL. Values outside this range do not have experimental values and their contours should be treated as...



Returns equivalent IIR coefficients for an analog RC filter

Usage: [B,A] = RC_FILTER(r, c, fs, type);

R is the resistance value (in ohms)
C is the capacitance value (in farrads)
FS is the digital sample rate (in...



Derive coefficients for a peaking filter with a given amplitude and bandwidth. All coefficients are calculated as described in Zolzer's
DAFX book (p. 50 - 55). This algorithm assumes a constant Q-term
is used through the equation.



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...