Hi,
This is a typical Mid-Side image control (where you have a middle signal which is the sum and a side signal which is the subtraction, and you control the balance between both), but in this case, when trying to extend the width beyond the original, it uses a high-passed signal, so that phase cancellations don't occur in lower frequencies. Quite a nice idea that I hadn't come across before.
Cheers,
Andrés
On Tue, Feb 21, 2012 at 2:47 AM, Roger Kelly
<[hidden email]> wrote:
Could someone explain to me how this width example works? I have been trying to implement this using left/right delay but it does not sound as good as this:
<CsoundSynthesizer>
<CsOptions>
</CsOptions>
<CsInstruments>
sr = 44100
kr = 4410
ksmps = 10
nchnls = 2
instr 1 ; Stereo Width Expander.
ilevl = p4 ; Output level
iwidth = p5 ; Stereo width: -1=Mono 0=Normal +1=Wide
ifreq = p6 ; Bass cut frequency
a1, a2 soundin "sa_beat1.aif"
ahp1 atone a1, ifreq
ahp2 atone a2, ifreq
aout1 = (iwidth >= 0 ? a1 - ahp2*iwidth : a1 + a2*int(iwidth))
aout2 = (iwidth >= 0 ? a2 - ahp1*iwidth : a2 + a1*int(iwidth))
outs1 aout1*ilevl
outs2 aout2*ilevl
endin
</CsInstruments>
<CsScore>
; Strt Leng Levl Width Freq
i01 0.00 1.50 1.00 -1.00 100 ; Mono
i01 2.00 . . -0.50 . ; Narrow
i01 4.00 . . 0.00 . ; Normal stereo
i01 6.00 . . 0.50 . ; Wide
i01 8.00 . . 1.00 . ; Very wide
e
</CsScore>
</CsoundSynthesizer>
Locked
