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In general maybe, but I don't think so in this case

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Dave Kingsland

In Reply to: But couldn't the upsampling "process" in the studio have added the extra harmonics you see? . . . posted by Martin419 on August 19, 2004 at 17:50:41:

Using the JT Hourglass SACD, Alex made comparisons between multichannel data taken from the 47Ai player and the same data taken from the 49TXi receiver. The extra content only shows up in the data taken from the receiver, meaning it's not on the disk. See the links in my reply to Christine.
He didn't provide the same comparison for Two Against Nature, but the multichannel data taken from the 49TXi also shows extra stuff that has the same characteristics as the extra stuff in the Hourglass data. And in Stereophile's similar analysis of Two Against Nature, it doesn't appear.
The data for DSOTM and Diana Krall also exhibit seemingly extra ultrasonics of a similar shape and level, only on those discs there is no sharp cutoff to make it obvious.
I see no other reasonable conclusion from all this other than it being an artifact of the processing in the 49TXi.
Dave

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Re: In general maybe, but I don't think so in this case - Alex Striganov 10:40:41 08/23/04 (0)
Dave, we will check it out. Only one possible reason in 49TXi to add such ultrasonics is switching to slow roll-of in digital filters DF1706. They work in software mode, therefore the modes are settled by DSP, I can't track such switching on the schematics. I didn't pay attention, was hi-bit/hi-sampling on or off in my measurements, as it was advertised for CDs, DVD-V (DD and DTS) - low resolution sources only. No one word about any improvement of sound for SACD or DVD-A ...
Here is the explanation of Audio Scaler, provided at Pioneer (Europe) website:
http://members.cox.net/alex_lat/images/Audio_scaler.PNG
But you had pointed to an interesting question. We didn't have the explanation for the line at 22kHz or 24 kHz, which is presented on almost all spectrums. We also know, that in advertised AX10Ai(59TXi) signals are processed in DSPs at 96kHz, that means - for the previous model 49TXi it could be 48kHz in all DSPs or partially in some of them (we have 2 SHARCs and Motorola DSP in it).
We need some additional measurements, and if they will confirm Dr. Gresinger's, yours and John's suggestions and measurements concerning 24/96 Steely Dan DVD-A and James Taylor SACD, that will be an idea for another article - Smoke and Mirrors in AV industry ...

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