FFT - The graphic nature of the FFT (Fast Fourier transform)
Filter makes it easy to draw curves or notches for rejecting or boosting specific
frequencies. Used to create band-pass filters (which keeps only a certain
band of frequencies), high-/low-pass filters (for reducing or eliminating
the low or high-end frequencies), narrow-band pass filters (to simulate a
telephone pickup) or notch filters (which eliminate very narrow frequency
bands).
Graphic Equalizer - can boost or cut the signal at particular
frequency bands, and have a visual representation of the overall EQ curve.
Notch Filter - filters up to six user defined frequencies,
in addition to standard telephone DTMF tones. Used to remove very narrow band
frequencies. For example, you can remove a 60Hz hum while leaving all 59Hz
and 61Hz audio untouched.
Parametric Equalizer - used for fine editing of frequencies
within a sound. Parametric equalizers differs from equalizers that offer a
specific number of frequencies and Q bandwidths (which determines how many
overall frequencies will be effected by a single, selected frequency control)
in that they give you continuous control over the frequency, Q and gain settings.
For example, with the parametric equalizer, one can boost a broad range of
frequencies that are centered around 1000 Hertz (1kHz), or boost the low frequencies
while simultaneously inserting a 60 Hz notch filter.
IIR Filter - (Infinite Impulse Response) filters for
precise band pass, band reject (notch), or high or low pass filtering, including
Bessel, Butterworth, Chebychev type 1, and Chebychev type 2
