In Reply to: RE: Hey JimiAustin: MQA Enabled ADCs posted by 13th Duke of Wymbourne on October 31, 2016 at 18:09:21:
> An ADC is still an ADC. The answer in the linked interview does not state
> there is anything special about the ADC function for MQA except 'low
> modulation noise', i.e. it should be a good ADC.
There are 2 strategies for designing an ADC with a very short impulse
response of the type desired by the MQA system. One is to use a true DSD
converter running at 128Fs or higher with a first-order low-pass
antialiasing filter set well above the desired passband. The other is to do
what Ayre has done in its QA-9 converter at 192kHz, where it uses a
moving-average low-pass filter, of the type described by Keith Howard at
the article linked below.
John Atkinson
Technical Editor, Stereophile
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Follow Ups
- RE: MQA Enabled ADCs - John Atkinson 11/1/1609:29:45 11/1/16 (2)
- RE: MQA Enabled ADCs - 13th Duke of Wymbourne 18:15:35 11/2/16 (0)
- RE: MQA Enabled ADCs - bjh 20:18:49 11/1/16 (0)