Digital LP

whitelabrat · 24th January 2008, 05:08 PM

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?

oshifis · 24th January 2008, 05:21 PM

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 · 24th January 2008, 05:36 PM

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?

Werner · 25th January 2008, 07:47 AM

You may also want to look at Soundstream

http://en.wikipedia.org/wiki/Soundstream

oshifis · 25th January 2008, 09:05 AM

Quote:

Originally posted by whitelabrat
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.

whitelabrat · 25th January 2008, 02:21 PM

Very informative reading! Thanks for your submissions!

EC8010 · 25th January 2008, 05:49 PM

The predecessor to the PCM-1600 was the Sony F1. Both processors were intended to record on U-Matic (a Sony product), not VHS (a JVC product).

jlsem · 29th January 2008, 03:54 AM

http://en.wikipedia.org/wiki/Soundstream

Quote:

Despite analog playback, many of these releases were sufficiently impressive...

The naivete of the writer is charming.

John

24th January 2008, 05:08 PM	#1
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	Digital LP 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?

25th January 2008, 07:47 AM	#4
Werner diyAudio Member Join Date: Jan 2002 Location: Belgium	You may also want to look at Soundstream http://en.wikipedia.org/wiki/Soundstream __________________ bring back dynamic range

25th January 2008, 05:49 PM	#7
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	The predecessor to the PCM-1600 was the Sony F1. Both processors were intended to record on U-Matic (a Sony product), not VHS (a JVC product). __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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24th January 2008, 05:21 PM	#2
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	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.

24th January 2008, 05:36 PM	#3
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	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?

25th January 2008, 02:21 PM	#6
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	Very informative reading! Thanks for your submissions!

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