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a great explanation of how MQA works from Meridian

108.249.169.177
Posted on January 10, 2017 at 14:05:30
ahendler
Audiophile

Posts: 5151
Location: San Antonio, Texas
Joined: January 24, 2003
 Play the video at this link
http://www.mqa.co.uk/customer/how-it-works
It seems what he is saying is that the Tidal app by itself is taking the 24/48 file which contains region A with B and C embedded and Creates the 24/96 file which contains regions A and B with C embedded. To get C you need a dac with MQA decoding. That is why a dac without MQA decoding sounds better with a MQA file streamed from Tidal because you are getting A and B while a 16/44 file only gives you region A. I think I am finally getting it.
Alan

 

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RE: a great explanation of how MQA works from Meridian, posted on January 10, 2017 at 14:50:12
PAR
 Not quite. If you replay Bob Stuart talking again you will see that region C is only noise. The difference between using Tidal MQA decoding and using an MQA equipped DAC concerns the ultimate version of MQA "deblurring" which is, as I have written before, where the DAC characteristics need to be "known" by MQA for the full MQA Master process.
.
BTW I am surprised that you didn't put the link into the URL field in the "Post a Message" box rather than make us copy and "paste and go".

Regards

Pete

 

RE: a great explanation of how MQA works from Meridian, posted on January 10, 2017 at 15:36:20
ahendler
Audiophile

Posts: 5151
Location: San Antonio, Texas
Joined: January 24, 2003
 Yes but he says that region c is important. Also the deblurring concept
is a strange one. Think about it. Warner brothers has encoded supposedly 30,000 albums with Mqa. These are albums from all over the place How do the possible know the original equipment used to record these albums.
Also about the link. I have posted thousands of times on the asylum. Sometimes I do and sometimes I don't. Was very busy and forgot. Is it really so difficult to copy and paste a link?
Alan

 

Is it really so difficult to copy and paste a link?, posted on January 10, 2017 at 16:06:22
Kal Rubinson
Reviewer

Posts: 12436
Location: New York
Joined: June 5, 2002
 No but it is easier not to if the level of motivation is not high.

 

RE: a great explanation of how MQA works from Meridian, posted on January 10, 2017 at 16:08:18
PAR
 Regarding the "deblurring " concept, the original idea that made it practical is that the variety of ADCs used in studios is rather limited thus making a set of correction algorithms viable. The idea was that the record company would know which was used and be able to provide this information when encoding.

However, given the limited number of alternatives for ADCs in the pro field, a program has subsequently been devised that examines the characteristics of a given recording and which can identify (or deduce) which ADC was used and then apply the appropriate correction.

Unfortunately a similar limited number of alternatives does not exist in the world of consumer DACs.

Sorry about my intemperate reference to the URL field but having to copy and paste does annoy me even if it is a simple process.

Regards

Pete

 

this clears up all the confusion, thanks, posted on January 10, 2017 at 16:25:14
bullethead
 thanks a lot Alan, this clears up all the confusion, a lossless wrapping and unfolding process! Excellent!

Creating a spiral in a way.

I appreciate this.

Does anyone know where to get a list of MQA DACs?

 

RE: a great explanation of how MQA works from Meridian, posted on January 10, 2017 at 16:44:32
ahendler
Audiophile

Posts: 5151
Location: San Antonio, Texas
Joined: January 24, 2003
 We're good
I appreciate the comments on deblurring. I do know that some of the old favorites sound really good . Fleetwood mac roumers sound as good as I have ever heard it and some of the Carly Simon albums are wonderful
Alan

 

RE: "Is it really so difficult"???, posted on January 10, 2017 at 18:13:59
Ivan303
Audiophile

Posts: 48887
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
 Not on OS-X and a mouse.

Highlight (select) text containing the link and right click to 'open link in new tab'.

OK, about one second and one click more?




First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass

 

RE: "Is it really so difficult"???, posted on January 10, 2017 at 18:40:01
merlinus
Audiophile

Posts: 244
Location: Northern New Mexico
Joined: June 24, 2008
 Works the same with firefox on linux.

 

RE: a great explanation of how MQA works from Meridian, posted on January 10, 2017 at 19:34:30
ahendler
Audiophile

Posts: 5151
Location: San Antonio, Texas
Joined: January 24, 2003
 Why isn't the focus of comments on the excellent explanation of how MQA works. Instead opening a link. Really??
Alan

 

RE: a great explanation of how MQA works from Meridian, posted on January 11, 2017 at 10:56:56
Isaak J. Garvey
Industry Professional

Posts: 1207
Location: Hollywod, CA
Joined: January 7, 2016
 How big an MQA fan boy are you? is this like the 50th MQA thread you have started?

I will have fun watching all the other MQA Lemmings follow you off the cliff.

 

RE: a great explanation of how MQA works from Meridian, posted on January 11, 2017 at 12:14:44
ahendler
Audiophile

Posts: 5151
Location: San Antonio, Texas
Joined: January 24, 2003
 I like anything that makes my music sound better and MQA does it. I really have not started that many but have participated in most of them.
There is no cliff. I never bought into DSD or so called hi-rez downloads.
Considering I am getting MQA files for the same price as 16/44 files from Tidal and they sound so good seems to me a good deal
By the way there are currently 8 MQA threads going. I started 2, others 6
Alan

 

Received these links from Audiostream, posted on January 11, 2017 at 13:32:56
srl1
Audiophile

Posts: 1339
Location: Florida Panhandle
Joined: September 2, 2003
 Just a lemming here. The "Optional Link URL:" is a page provided by Audiostream on how MQA works in big block diagrams. The one here in the text is the one I've been waiting for. Audioquest will provide MQA decoding upgrade free via an app for its DragonFly Black and Red DACs "in a few short/long weeks." This, along with the inevitable appearance of an IOS/Android Tidal app upgrade will allow me to enjoy MQA fully from my iPod Touch or Samsung Galaxy.

Dragonfly upgrade link:

http://www.audiostream.com/content/mqa-blue-new-black#7vq4MD2zySLxfbrs.97

 

RE: a great explanation of how MQA works from Meridian, posted on January 12, 2017 at 09:20:45
knewton
Audiophile

Posts: 563
Location: Mid-Atlantic/Northeast
Joined: May 18, 2010
 Stuart's brief explanation for ultrasonic region 'B', which appears to be located above 22kHz, didn't make any sense to me. I heard him as suggesting that there is audible music content located there. It seems more likely to me that region B simply exists as an consequence of a system that can be folded down from four times the human audible bandwidth.
_
Ken Newton

 

RE: a great explanation of how MQA works from Meridian, posted on January 12, 2017 at 11:00:24
Dave_K
 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.

 

RE: a great explanation of how MQA works from Meridian, posted on January 12, 2017 at 14:14:39
ahendler
Audiophile

Posts: 5151
Location: San Antonio, Texas
Joined: January 24, 2003
 If you read HiFi News and record review They review hirez downloads and show the extension of musical information. Music recorded at 24/96 has a fair amount of musical information in Stuarts B region. A lot of high overtones. The fact that we can't hear that high does not mean it doesn't effect the sound. There are many studies that show info that we can't hear interacts with audible material to enhance the sound. Look at super tweeters. Operating above audible hearing yet most people who use them are certain they effect the sound. Stuarts C region has no musical content at all. Just noise yet Stuart says it effects the sound
Alan

 

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