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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: a great explanation of how MQA works from Meridian posted by PAR on January 10, 2017 at 16:08:18:
Were the details of this ever disclosed? I found it hard to accept this particular claim.
There's a large number of digital recorders currently available in the pro market using a variety of ADC chips and a variety of DSPs. And the products get replaced fairly regularly. So if you were able to count the number of anti-aliasing filters used over the history of commercial digital recording, it would be huge. And most of them wouldn't be available to whoever is writing this program.
Also, a large number of recordings, particularly rock and pop recordings produced during the last 30 years, are recorded in multiple locations with different converters used for different tracks. Then they were all mixed. How would you handle that?
Finally, for ADCs that are operating at 88.2 KHz or above (most commonly 96 KHz), the cutoff of the anti-aliasing filter is above the music. The filter is filtering uncorrelated noise, so about all you can tell by analyzing the converter's output is what the cutoff frequency is, based on where the noise drops off. But then the vast majority of converters are all going to look the same.
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- RE: a great explanation of how MQA works from Meridian - Dave_K 11:00:24 01/12/17 (0)
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