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#1
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50 kHz Soundstream Files
Were any of these ever made available to the public? Anyone ever hear one of these recording played back at 50 kHz (or 48 kHz)? Just curious. I was listening to some Michael Murray on the Methuen organ, and thinking about how it might sound without the damaging sample rate conversion in the way.
Sean B |
#2
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50 kHz Soundstream Files
On 2/12/2020 8:52 pm, Sean B wrote:
I was listening to some Michael Murray on the Methuen organ, and thinking about how it might sound without the damaging sample rate conversion in the way. Probably indistinguishable. geoff |
#3
Posted to rec.audio.pro
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50 kHz Soundstream Files
geoff wrote:
On 2/12/2020 8:52 pm, Sean B wrote: I was listening to some Michael Murray on the Methuen organ, and thinking about how it might sound without the damaging sample rate conversion in the way. Probably indistinguishable. There were never any files. When the Telarc records were released, the conversion was done by playing back the Soundstream machine's analogue output into the analogue input of a PCM-1630 machine. No computer or workstation involved. In 2017, Paul Blakemore demonstrated a restored Soundstream machine playing back one of the Telarc recordings live at the AES show and it sounded pretty good. At the time there was some discussion about whether it would be possible to get a digital output from the Soundstream in order to directly digitize some of those recordings and the basic answer is that it would be possible but it might require some software to reproduce some of the error processing and so forth. I would suspect that a digital transfer would be a lot better than the CD releases available, given how horrible the 1630 machine was. Although the Soundstream used a state of the art ladder converter and sounded far better than the Sony recorders, I suspect modern conversion would be audibly better. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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50 kHz Soundstream Files
On 3/12/2020 4:26 am, Scott Dorsey wrote:
geoff wrote: On 2/12/2020 8:52 pm, Sean B wrote: I was listening to some Michael Murray on the Methuen organ, and thinking about how it might sound without the damaging sample rate conversion in the way. Probably indistinguishable. There were never any files. When the Telarc records were released, the conversion was done by playing back the Soundstream machine's analogue output into the analogue input of a PCM-1630 machine. No computer or workstation involved. In 2017, Paul Blakemore demonstrated a restored Soundstream machine playing back one of the Telarc recordings live at the AES show and it sounded pretty good. At the time there was some discussion about whether it would be possible to get a digital output from the Soundstream in order to directly digitize some of those recordings and the basic answer is that it would be possible but it might require some software to reproduce some of the error processing and so forth. I would suspect that a digital transfer would be a lot better than the CD releases available, given how horrible the 1630 machine was. Although the Soundstream used a state of the art ladder converter and sounded far better than the Sony recorders, I suspect modern conversion would be audibly better. --scott So what media is the data retained o internal to the Soundstream unit ? If still in existance surely is would be a fairly minor DP exercise these days to somehow access, transcode it to a usable digital format ? geoff |
#5
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50 kHz Soundstream Files
geoff wrote:
So what media is the data retained o internal to the Soundstream unit ? If still in existance surely is would be a fairly minor DP exercise these days to somehow access, transcode it to a usable digital format ? It's a 1" Honeywell instrumentation recorder with 16 bits across the tape width. As I recall there is no parity, so the decoder stores each word twice, and on playback if they don't compare identically it interpolates over the error. http://www.panix.com/~kludge/soundstream1.jpg http://www.panix.com/~kludge/soundstream2.jpg Easiest thing might be to take the raw parallel data off the transport into a DRV-11 sort of interface and deal with everything in software. Would not be expensive to do. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#6
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50 kHz Soundstream Files
The CD booklet claims that the sample rate conversion is performed by a Studer SFC-16.
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#7
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50 kHz Soundstream Files
Sean B wrote:
The CD booklet claims that the sample rate conversion is performed by a Studer SFC-16. That would be the smart way to do it and MUCH better than going through an analogue generation like the older Telarc stuff. I don't know how tight or accurate the filters on the Studer are... no doubt modern SRC could be much better than anything done in hardware back then... but it's going to be a whole lot better than any A/D or D/A at the time and pretty much blameless. Hmm... looking it up... and I do actually have a manual for the Studer D19... it looks like the SFC16 card was really just a couple AD1890 chips and some glue logic. The AD1890 has been bettered by quite a bit today, but it was inoffensive and never a problem. So likely you have something about as good as you're going to get from that master. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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