Re: Vinyl Ripping Workflow Suggestions Appreciated
Reply #23 – 2016-10-18 12:44:53
Aren't the limitations of the human ear also relevant? Of course they are. I am fascinated when people start pontificating about filter types and slopes, illustrated with nicely drawn FR curves from theoretical simulations, and completely and perhaps conveniently forget to do any DBTs, Above we are presented with two frequency response curves, The supporting text seems to take it as revealed truth that they are distinguishable in an ABX test. This might be so, but is the reason for the differences above or below 10 KHz? (where RBJ = http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt , 1e+4rad/s = 1591.55Hz, 1e+5rad/s = 15915.49Hz ) I don't mind to do DBT but, here are the coefficients for those various filters shown in plot if someone wants to run ABX test: fs = 44.1kHz fc = 17kHz Q = 0.707 (= BW=1.900) Analog prototype: 11409262687.6593 1.0 151080.8348261004 11409262687.6593 Various RBJ paper implementations: Case Q [ 0.8760666490683719 1.752133298136744 0.8760666490683719 1.466061529573591 1.504266596273488 0.533938470426409 ] Case BW [ 0.8760666490683719 1.752133298136744 0.8760666490683719 2.691575899010475 1.504266596273488 -0.6915758990104754 ] Case Q + prewarped Q [ 0.8760666490683719 1.752133298136744 0.8760666490683719 2.023192926460408 1.504266596273488 -0.02319292646040805 ] Filter which is matched to the analog magnitude response Matched 2nd order (MIM) [ 0.8359412478697531 0.1948669448559074 -0.112155492262995 1.0 -0.03000145304555539 -0.05134584649177911 ] If you use EqualizerAPO then just copy lines from code block to the config.txt (! ON/OFF states)Filter: ON IIR Order 2 Coefficients 0.8760666490683719 1.752133298136744 0.8760666490683719 1.466061529573591 1.504266596273488 0.533938470426409 Filter: OFF IIR Order 2 Coefficients 0.8760666490683719 1.752133298136744 0.8760666490683719 2.691575899010475 1.504266596273488 -0.6915758990104754 Filter: OFF IIR Order 2 Coefficients 0.8760666490683719 1.752133298136744 0.8760666490683719 2.023192926460408 1.504266596273488 -0.02319292646040805 Filter: OFF IIR Order 2 Coefficients 0.8359412478697531 0.1948669448559074 -0.112155492262995 1.0 -0.03000145304555539 -0.05134584649177911