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
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
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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