Digital LP

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Don't let the subject fool you. My question is about LP's that would seem to have been mastered from a Digital source back in the 80's (late 70's?) when digital audio was exotic.

I was given a small collection of classical pieces on "Digital" LP. One of the albums, by Philips, explains the digital concepts, but other than that there are no details. Does anyone know more about the mastering involved?

Junk? :(
 
They used a SONY PCM-1604 A/D converter device that accepted 2-channel audio from the mixer and gave out a PAL/NTSC video signal encoded. Then the video signal was recorded on a VHS video tape recorder. It eliminated the audio tape recorder in the studio and the primary purpose was reduction of the tape hiss.
 
whitelabrat said:
Sounds about right. I just found a note on Wikipedia that mentions the use of video recorders to record digitally. There is some suggestion that the process resulted in a higher quality than what would end up as Redbook.

Any details on the Sony PCM-1604 used?
It was a PCM-1600. Here I found some info:

http://www.sony.net/Fun/SH/1-21/h2.html
http://en.wikipedia.org/wiki/PCM_adaptor

I had the service manual and I might still have it somewhere. As I remember, the analogue part was NE5534AN and the ADC was some Sony CX-xxx circuit.
 
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