Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

RE: a great explanation of how MQA works from Meridian

Posted by Dave_K on January 12, 2017 at 11:00:24:
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.