MQA Deep Dive - I published music on tidal to test MQA

[voodooless]

...I'll put myself on the spot here (gladly, as it will allow true experts to throw rocks.)

But while RF-frequency ('gigahertz class") DACs' state-of-the-art today is about 20 bits, I thought that low-frequency audio DACs (and digital filters of DAC SoCs) are at least 24bit, and might even be 32 now...? While still 'of consumer prices'..?

Where do you get the idea that RF gets to 20 bits?

 

[DimitryZ]

Your snark is getting a bit old and tired. Please try to be more pleasant in your attempt to belittle anyone who disagrees with you.

I acknowledged to the administrator that this was unnecessary. And so apologize for that to you personally.
However, factually, full level or near full level tones at 35 KHz don't exist in actual music.

Thoughts?

 

[Raindog123]

Where do you get the idea that RF gets to 20 bits?

I might have gotten carried away with that 'about 20-bit'... Would 16-bit be more agreeable? Or is the true (core) resolution still 14? (Searching through Maxim Integrated catalog as we speak... meanwhile will update my original post)

 

[voodooless]

I might have gotten carried away with that 'about 20-bit'... Would 16-bit be more agreeable? Or is the true resolution is still 14? (Looking at Maxim Integrated catalog as we speak...)

No idea, just wondering where you got the info Please note that RF DAC’s are quite different animals. Because the frequency is so high, oversampling cannot be used in most cases. This means that the output is highly reliant on analogue filtering. THD specs will be nowhere as good as audio DAC’s. But usually that is okay, since the use cases don’t demand it.

 

[Raindog123]

No idea, just wondering where you got the info

MAX5800:

Search - Maxim Integrated

MAX5868.pdf (maximintegrated.com)

..and If I tell you any more I'll have to kill you

 

[voodooless]

MAX5868.pdf (maximintegrated.com)

..and If I tell you any more I'll have to kill you

66 SINAD at best

 

[Raindog123]

66 SINAD at best

Yes, it will be silly to put it in a hi-fi streamer... Especially with its price sticker... But on the flipside, one would enjoy 2.5GHz ultra-ultra-sonics!

 

[voodooless]

Yes, it will be silly to put it in a hi-fi streamer... Especially with its price sticker... But on the flipside, one would enjoy 2.5GHz ultra-ultra-sonics!

Stick your head into an active microwave, those will give you ultrasonics of roughly the same frequency.. and you’ll actually feel it

Disclaimer: don’t do that

 

[Raindog123]

Stick your head into an active microwave, those will give you ultrasonics of roughly the same frequency.. and you’ll actually feel it

...and now we're talking about [GaN] amplifiers. (But yes, still do not stick your head in a microwave!!)

 

[amirm]

Looks like you can sell it.. it’s called MQA It’s just that nobody told the audiophiles as much. They could have made MQA with far less effort: just make a new file format derived from FLAC that uses 20 bit audio internally, and outputs 24 bit audio after decode.

Well, whatever you build also needs to have a complicated story so audiophiles can't understand it just like MQA and believe you are producing 24 bits.

 

[bennetng]

20 bits is pathetic? It's only the limit of modern DACs...

"Pathetic" was my comment from the perspective of MQA marketing, you have to read the previous discussion rather than solely quote a single post.
https://www.audiosciencereview.com/...-music-on-tidal-to-test-mqa.22549/post-804786

 

[DimitryZ]

...and now we're talking about [GaN] amplifiers. (But yes, still do not stick your head in a microwave!!)

In the early days we called them Aluminum Gallium Nitride devices (AlGaN). I was developing cold plates/heat sinks for them in the day. Good times!

https://www.researchgate.net/publication/266641424_GaN_HEMT_reliability_through_the_decade

 

[BrEpBrEpBrEpBrEp]

"Pathetic" was my comment from the perspective of MQA marketing, you have to read the previous discussion rather than solely quote a single post.
https://www.audiosciencereview.com/...-music-on-tidal-to-test-mqa.22549/post-804786

Ah, sorry about that, I got confused. Believe it or not, I have read this whole thread, but it's so easy to lose track as you leave and come back to it. My bad, I misread/misunderstood your comment in the context.

 

[symphara]

They can't spell the word.

(Oh god what a bad pun )

If you have a 3-byte word take that thing to the shop and demand your money back!*

*unless it's a DSP

 

[Raindog123]

Because the frequency is so high, oversampling cannot be used in most cases. This means that the output is highly reliant on analogue filtering.

True... And yes we do rely on analog [bandpass] filters alot... Yet we do digital oversampling quite a bit too - and then upconvert... Have to upconvert, especially if your boss wants you in W-band (at 80GHz, and above...) All depends on the app...

 

[goldenears]

However, factually, full level or near full level tones at 35 KHz don't exist in actual music.

Thoughts?

Please, tell us what the frequency content specifications of "actual music" is.

 

[DimitryZ]

Please, tell us what the frequency content specifications of "actual music" is.

Ultrasonic content is very low compared to normal music in the baseband.

I don't think there is any controversy here.

If you look at your tweeters they are much smaller than your woofers.

The reason is that there is much less energy in the HF.

Ultrasonics take even less energy.

 

[Raindog123]

Believe it or not, I have read this whole thread, but it's so easy to lose track as you leave and come back to it...

All, Getting to 200 pages! Has the festivities committee been formed and is working on it?

 

[BrEpBrEpBrEpBrEp]

All, Getting to 200 pages! Has the festivities committee been formed and is working on it?

It's like watching a trainwreck in motion...

 

[voodooless]

It's like watching a trainwreck in motion...

Slow motion though