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Old 26th February 2008, 07:50 PM   #1
diyAudio Member
Join Date: May 2007
Smile Reprocessed for stereo, Rechanneled for stereo and Duophonic

Hello there,

Can anyone out there describe what record companies were doing when they took older Mono recordings and .....

1) reprocessed or rechanneled for stereo

2) issued a "Duophonic" disc, usually Capital.

I think it was more than just putting bass on the left and treble on the right.

Please advise and thank you in advance for any information.

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Old 29th February 2008, 01:31 AM   #2
fergs1 is offline fergs1  Australia
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Join Date: Jan 2005
Location: melbourne
the Devils' work!
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Old 29th February 2008, 12:40 PM   #3
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Join Date: Mar 2004
Location: Budapest, Hungary
They are shifting phase: left channel is passed though an all-pass filter that realizes continuous phase shift from 0 to 90 degrees from low to high frequencies, right channel is from 0 to -90 degrees. So low frequency is in phase, high frequency is out-of phase, medium frequencies 90 degrees apart, resulting in a "fancy" pseudo-stereo effect.
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Old 29th February 2008, 01:20 PM   #4
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Join Date: May 2007
Thank you both.

I have noticed that some duophinic sinatra releases were not that bad.

Does anyone know of a software program that can do that?????

old heathkitphil
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