linuxaudio.org

[Fons Adriaensen]

quoted text
>On Tue, Mar 19, 2013 at 04:26:21AM +0100, Tim Goetze wrote:

>> A 2nd-order IIR filter is often called a "biquad"; at musicdsp, look

>> for that instead.

>

>Not really. A biquad is one way to implement a 2nd order IIR, and

>in many cases related to audio DSP, not really the best way.

>

>Anyway, using a biquad for something so simple is giant overkill.

[...]

quoted text
>// Else run the filter:

>

>for (i = 0; i < nframes; i++)

>{

>    g1 += w * (gt - g1 - a * g2);

>    g2 += w * (b * g1 - g2);

>    out [i] = g2 * in [i];

>}

Surely you realise this version executes exactly as many additions and

multiplications per sample as a biquad?

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