What it does
Three-band equaliser built from FIR digital filters (FFT implementation)
Ilustrates the use of three parallel FIR filters for building a 3-band equaliser. The filter bandwidths are selected in order that the low-pass, band-pass, and high-pass filters are complementary, i.e. they split the spectrum into three bands with minimal overlap. The signal level in a given band can be adjusted via the "Output gain" slider in the corresponding filter, and/ or via the corresponding "Gain" slider in the Mixer.
The structure can be extended to create more bands (though multirate methods are considerably more efficient, see "MultirateEqualiserBuiltFromScratch.dwb" for example).