WEISS GAMBIT EQ1-MKII Provozní pokyny stáhnout pdf (Strana 11)

OPERATING INSTRUCTIONS FOR GAMBIT EQUALIZER EQ1-LP OPERATION

Daniel Weiss Engineering Ltd., Florastr. 42, CH-8610 Uster Page 11 of 28

 +41 1 940 20 06  +41 1 940 22 14  http://www.weiss.ch  [email protected]

FIR filters are used mainly for applications requir-

ing extremely narrow transition bandwidths com-

bined with no audible distortion (i.e. phase shifts)

in the pass band (although a so called pre-echo

can become a problem in FIR implementations).

Examples (in audio applications) are interpolation

filters for sample rate conversion and band-split

filters for crossovers.

In order to avoid the technical and commercial

drawbacks of FIR systems for audio equalizers,

the Weiss Gambit EQ1-LP uses yet another

scheme for linear phase-response based on the

following property of IIR filters: if one processes a

piece of digital audio with any IIR system, then

time-reverses this piece and processes it again

with the same IIR system, one will effectively have

cancelled out the phase response of the IIR sys-

tem, while squaring the amplitude response (as

can be verified on any DAW). The solution lies in

the time-reversal (non-causality) of this algorithm.

So effectively, the EQ1-LP is a time machine,

sending the audio signal backwards through

time...

On a side note, this algorithm was already ex-

perimentally implemented by Weiss Engineering

in 1995, but only now is current DSP hardware

powerful enough to realize the seven band 96kHz

requirements of the EQ1-LP.

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WEISS GAMBIT EQ1-MKII Provozní pokyny Strana 11