Reprocessed for stereo, Rechanneled for stereo and Duophonic

oldheathkitphil · 26th February 2008, 08:50 PM

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.

oldheathkitphil

fergs1 · 29th February 2008, 02:31 AM

the Devils' work!

oshifis · 29th February 2008, 01:40 PM

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.

oldheathkitphil · 29th February 2008, 02:20 PM

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

26th February 2008, 08:50 PM	#1
oldheathkitphil diyAudio Member Join Date: May 2007	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. oldheathkitphil __________________ oldheathkitphil

29th February 2008, 02:20 PM	#4
oldheathkitphil diyAudio Member 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 __________________ oldheathkitphil

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29th February 2008, 02:31 AM	#2
fergs1 diyAudio Member Join Date: Jan 2005 Location: melbourne	the Devils' work!

29th February 2008, 01:40 PM	#3
oshifis diyAudio Member 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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