Check out "fast fourier transforms" (FFT) available for most DSPs and most
languages.

>Hi All,
>
>I need a simple (doesn't have to be really accurate) filter to cut all
>high frequencies (say > 120 hz) from a stream of samples. This way I want
>the peakmeter to react only on the bass tones.
>
>I already have dynamic backlight dimming linked to the peakmeter value,
>but it flashes at high tones too now...
>
>Can anybody help me out?
>
>Tomas
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>http://cool.haxx.se/mailman/listinfo/rockbox

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Received on Sun Aug 14 00:31:00 2005