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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: "the PS Audio DirectStream DAC acts also as pcm to dsd upsampler" posted by beppe61 on February 16, 2015 at 00:28:42:
"Even if the upsampling process can generate noise if the noise is out of the audio band (i.e. ultrasonic) can be quite easily filtered out ?"
It's not that simple.... The frequencies immediately above the audible band aren't the problem..... But the digital switching sends noise all the way to RF, which has been extremely difficult to filter out. (If you place an AM radio near a typical DAC, you'll hear RF interference on the radio.) The problem is the close proximity of analog electronics picks up this RF hash, and modulates the audio signal with it.
The best way to filter out the RFI is to isolate the active digital circuitry from the remainder of the system. Including use of optic lines wherever possible, isolation at the mains, and tube electronics. (And powering down any active digital audio devices when playing the FM tuner, vinyl, or analog tape.)
There hasn't been a method to knock the RFI down completely, save for playing analog media (cassettes, LPs, etc.) of digitized music- The RFI only occurred at the studio. Since the first "digital" recordings were digitally mastered LPs, the initial reaction to digital audio (Telarc/Soundstream) was ravingly positive. Nobody realized the ills of digitized audio until the digital processing was taking place in the end users' systems.
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Follow Ups
- RE: "the PS Audio DirectStream DAC acts also as pcm to dsd upsampler" - Todd Krieger 19:21:52 02/18/15 (2)
- RE: "the PS Audio DirectStream DAC acts also as pcm to dsd upsampler" - Tony Lauck 09:09:10 02/19/15 (0)
- RE: "the PS Audio DirectStream DAC acts also as pcm to dsd upsampler" - beppe61 22:34:40 02/18/15 (0)
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