Kurzweil:Parametric EQ

From Sonikmatter

Disambiguation: This page describes the Kurzweil DSP Block. For General information try Parametric EQ

Parametric EQ is a 3 block EQ that allows attenuation and adjustment of the frequency spectrum.

The three parameters that can be adjusted in real time are center frequency, amplitude and width.

Center frequency determines the frequency that will be cut or boosted by the EQ, and it is sweepable over the entire frequency spectrum.

Amplitude controls the amount of boost or cut applied to the signal. The units of gain are in dB, and this is the amount of cut or gain at the center frequency.

Width controls how much of the frequency spectrum around the center frequency is affected by the EQ. It is expressed in octaves and is defined as the distance in octaves between points either side of the center frequency where the attenuation is -3 dB, when the amplitude is set to -infinity.

This DSP Block can be used for normal EQ duties, such as removing problem frequencies, or boosting quiet frequencies, but it can also be used as an interesting effect by modulating the frequency in a similar way as a resonant Low-Pass Filter.

If used in this way, the center frequency is analogous to the cutoff frequency and the amplitude to the resonance. By modulating the amplitude in real time, the shape can be changed smoothly from a notch shape to a bandpass shape. Modulating the width produces dramatic effects that can thin and warm the sound, particularly when the other two parameters are being modulated.

The Puppeteer 00:10, 23 February 2006 (EST)

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