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In Reply to: RE: Upsampling everything to DSD SACD posted by airheadair on November 29, 2020 at 21:59:47
Nice. I have an SA10 too. In theory, converting 16/44 to DSD would make for a bit of harshness since the upsampled version's frequency is not an exact multiple of 44khz. It would have been an exact multiple of 48KHz or 96KHz, but not 44KHz. But the SA-10 sounds just beautiful.
Follow Ups:
The DSD clock is an integer multiple of the standard RB sample rate: 64 * 44.1kHz sample rate i.e 64fs is 64 * 44100 = 2.822400MHz
The bitstream runs at 2.822 MHz in order to overcome the limitations of a 1-bit D-S modulator which necessitates aggressive noise-shaping to achieve a decent SNR in the audible range. Consequently, the response may theoretically extend up to 100kHz, but the noise-shaping is designed such that the bandwidth for maximum SNR (120dB) is 20kHz which matches the Redbook specification.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
Yes. You are right. I forgot. Actually the SA-10 has two upsamplings - 11.2896MHz and 12.288MHz - being integral multiples of 44.1KHz and 48KHz respectively.
Edits: 01/06/21
So they sensibly maintain the oversampling ratio according to the base clock - I had wondered what would happen in that instance.
Thanks for the info!
BTW Happy New Year
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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