[PDF] [PDF] Real-Time Control of DSP Parametric Equalizers

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15 nov 2005 · A family of digital parametric audio equalizers based on high-order Butterworth, Chebyshev, and elliptic analog prototype filters is derived that 

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A new type of second-order digital parametric equalizer is proposed whose the Nyquist frequency, and derive a new class of digital parametric equalizers that 

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It is designed using a low shelf, mid peak, and high shelf filters, and can be usually found in home sound systems and guitar amplifiers A parametric equalizer 

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The parametric equaliser has got three controls It is a bandpass filter which can have variable cut or lift, so that a particular frequency band can be enhanced or 

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parametric filter section, along with the filter topology Analog-to-Digital (A/D) and Parametric equalizers are constructed by cascading several parametric filter 

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103EQ is a 3−band parametric equalizer that optimizes speaker sound quality, fixes microphone feedback and adjusts low, mid and high frequencies 

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Biquad Coefficients for Audio Parametric Equalizers Applying a second order IIR filter to the problem of parametric equalization appears to be so natural

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ChrisHanna

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ATCorporation,Marlborough,MA,USA

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2PARAMETRICFILTER

functi o o nseisshowninFigure2-1.

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Coefficients

bo=(1+a+K-Ka)1Parameter b

2=(1+a-K+Ka)l_APzXp_i_i--'__

a ]=bl........-"_Asiii t a

2=a_!tATi

Table4-2.FilterCoefficientCalculations

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6SYSTEMIMPLEMENTATION7TESTSANDRESULTS

loudspeaker,parametervariation. interestingavenueforfurtherstudy. i F i gure6-1.TestSystemBlockDiagram AE

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(m

S)(dB)(S)(F=1kHz)(F=1kHz)(F=400Hz)

stepssteps A sFstep1kHzsinewaveSoloPianoSoloFlute m

S)(octave)

10 10 ste p s 1 st ep s 1 1 sw e epsweep s w ee psweep T a b l 2 8

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Q=2,andFvaryingfrom100HztoIkHz.Mostofthe

7 .3QVariation

10REFERENCES

A sAQSinewavesSoloPianoSoloFlute (mS)(units)(125Hz,1kHz,4kHz)(F=400Hz)

Audiblediscretestepsat4kHzdiscretesteps

Audiblezippereffectat4kHzeffect

Aud i b lezippereffectat4kHz A u d i b leeffectat4kHzduetofastsweepeffect Aud i b l ezippereffectat4kHz S li ght lyaudiblezippereffectat4kHz T a b l

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36,pp.851-878(1988Nov.).

Processing

.,vol.ASSP-35,No.1,pp.118-120(1987 Sb c 28

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