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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: Thanks for the link posted by Charles Hansen on February 10, 2009 at 22:51:44:
"They are using a low-cost DSP chip from TI with algorithms from Anagram of Switzerland. It looks like they are doing ASRC (Asynchronous Sample Rate Conversion) of all sources to 192/24 and then feeding it to the Wolfson DAC chip."
That's Anagram's product, sample-rate conversion. ASRC as far as I'm concerned is a red flag for any real-time digital playback..... It's touted as a jitter reducer, but in reality it transforms the jitter to noise.
If the filter functions are controlled at the Wolfson DAC, the Anagram SRC ahead of it would override the functionality. Once the ASRC is performed, the filtering from the SRC module is already done, and cannot be reversed or re-done at the DAC. (Unless the minimum phase option bypasses the SRC.)
"I would assume that the Wolfson further oversamples it another 8x, but it is not clear if this is the case or not."
Most oversampling DAC chips only do so for Fs at 48 kHz and below. At least the data sheets I've looked at suggest that.
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Follow Ups
- RE: Thanks for the link - Todd Krieger 00:32:25 02/11/09 (5)
- Not What I Thought...... - Todd Krieger 01:35:51 02/11/09 (4)
- Like we said above, the Wolfson digital filter isn't used with the DacMagic - Slider 09:26:23 02/11/09 (3)
- Well, That Makes Sense...... - Todd Krieger 11:31:54 02/11/09 (2)
- Upsampling would be part of the DSP code - Slider 11:51:53 02/11/09 (1)
- RE: Upsampling would be part of the DSP code - Charles Hansen 12:38:47 02/11/09 (0)
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