;rms limiter, approx 10dB limiting range.
equ sigin reg0
equ avg reg1
equ gain reg2
equ expg reg3
equ expavg reg4
equ test reg5
rdax adcl,0.5
rdax adcr,0.5
wrax sigin,1 ;write mono input signal
mulx sigin ;square input
rdfx avg,0.001 ;average squared result
wrax avg,1 ;avg stored and in ACC
log -0.5,-0.125 ;square root and 1/x combined
exp 1,0
wrax gain,0
;now create an expansion value to
;modify the gain value
rdax sigin,1 ;read input common input signal
sof -2,0 ;and provide lots of gain
sof -2,0
sof -2,0
sof -2,0 ;add more gain and insert
sof -2,0 ;pot function here to vary
sof -2,0 ;expansion threshold
sof -2,0
sof -2,0
absa ;get abs value
rdfx expavg,0.001 ;average result
wrax expavg,1 ;avg stored and in ACC
log 0.5,0 ;take square root; this will
exp 1,0 ;cause gain to be reduced more gracelfully
mulx gain ;multiply by gain
wrax gain,1
mulx adcl ;use final gain value to affect output
sof 1.5,0 ;restore gain, to avoid output clipping
wrax dacl,0
rdax gain,1
mulx adcr
sof 1.5,0
wrax dacr,0 ;write outputs, zero ACC
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