|Re: [hatari-devel] Improved YM2149 sound|
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To correct misleading typo in my previous explanation.
Quartet mode represents the output voltage stripped of high frequency
AC component, but DC component remains.
The Quartet math model is:
(MaxVol*WARP) / (2.0 + 1.0/( 1/Ra + 1/Rb + 1/Rc))
(MaxVol*WARP) / (1.0 + 0.5/( 1/Ra + 1/Rb + 1/Rc)) (Wrong)
(MaxVol*WARP*0.5) / (1.0 + 0.5/( 1/Ra + 1/Rb + 1/Rc)) (Correction)
Note that the 1.0 represents the normalized 1k resistor. 0.5 represents
50% duty cycle for the parallel resistors being summed (this effectively
doubles the pull-up resistance).