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RE: MQA Enabled ADCs

Posted by John Atkinson on November 1, 2016 at 09:29:45:
>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.