Wow! Imagine if all your existing CDs could magically contain way more data...

[jaxwired]

Anybody ever heard of "compressed sensing" technology. Apparently this new technology allows for sparse data to be filled in with extremely high accuracy. Like fuzzy pictures made super hi-res and accurate with no extra data. Magic! Sounds like this could be applied to existing data on compact discs. Your CDs could be read and transformed into super hi res audio streams by the next generation of players. WOW!

EDITED BY MODS - House Rules

http://www.ratchetup.com/eyes/2010/03/compressed-sensing.html

 

[idc]

The only way to put back what wasnt there is to guess what was there. That sounds like digital processing gone mad.

 

[jaxwired]

idc:The only way to put back what wasnt there is to guess what was there. True, but it's not random guessing, it's educated guessing because they have figured out that the missing data has consistent properties that allow for accurate guessing. In fact, it's super accurate guessing.

 

[Frank Harvey]

Well if it's done in a similar way to Pioneer's old Legato Link, it might have something going for it....

 

[Anonymous]

Isn't this just upsampling, something that's been around for ages. Maybe throw in something weird like Q Sound.

 

[idc]

jaxwired:idc:The only way to put back what wasnt there is to guess what was there. True, but it's not random guessing, it's educated guessing because they have figured out that the missing data has consistent properties that allow for accurate guessing. In fact, it's super accurate guessing.

The same super accurate guessing algorithms which take data out to make lossy files, in reverse. But we always say you cannot put back what was not there!

 

[Frank Harvey]

idc:The same super accurate guessing algorithms which take data out to make lossy files, in reverse. But we always say you cannot put back what was not there!

Did you ever hear the PDS Pioneers? They certainly sounded different to everyone elses CD players, and definitely had something about them that was preferable.....

 

[idc]

I will google PDS Pioneer as I have never heard of them. If they were so good, why are they not better known?

 

[Frank Harvey]

They were at the time, but not sure why Pioneer dropped it. I say PDS, the PDS was referring to the transport mechanisms, which were stable platter, but it was mostly these that used Legato Link. This was a mathematical procedure which was designed to put in the harmonic frequencies above 20kHz that are brick walled by CD's. This was done on the basis that what we hear below 20kHz is affected by what we can't hear above, which was never there on the CD, but is/was/might've been on the vinyl.

It's a real shame Pioneer didn't produce a Stable Platter CD transport with a separate Legto Link DAC - that'd have been interesting....

 

[idc]

That takes me back. I remember reading about how frequencies outwith our hearing range can still, somehow be detected.

 

[Frank Harvey]

I used to have a PDS901. Built like a tank. I should never have sold that.

 

[Mike_Schmidt]

Qsound comes from my stopping grounds in Alberta. Madonna has a disc done by them and it sounds pretty good.

 

[Andrew Everard]

Thread moderated.

 

[Frank Harvey]

Mike_Schmidt:Qsound comes from my stopping grounds in Alberta. Madonna has a disc done by them and it sounds pretty good.

It was quite popular in the early 90's, but seems to have disappeared now.

 

[bretty]

FrankHarveyHiFi:
They were at the time, but not sure why Pioneer dropped it. I say PDS, the PDS was referring to the transport mechanisms, which were stable platter, but it was mostly these that used Legato Link. This was a mathematical procedure which was designed to put in the harmonic frequencies above 20kHz that are brick walled by CD's. This was done on the basis that what we hear below 20kHz is affected by what we can't hear above, which was never there on the CD, but is/was/might've been on the vinyl.

It's a real shame Pioneer didn't produce a Stable Platter CD transport with a separate Legto Link DAC - that'd have been interesting....



Is the 'Legato Link' technology similar to the adjustable 'Dither' that I have on my Rotel RCD-991?

 

[bernasmeister]

FrankHarveyHiFi:

Mike_Schmidt:Qsound comes from my stopping grounds in Alberta. Madonna has a disc done by them and it sounds pretty good.

It was quite popular in the early 90's, but seems to have disappeared now.

Sting did an album using Qsound as well... The "All this time" track had quite an impressive 3D effect when played on vinyl.

 

[AlmaataKZ]

From the link in the OP it looks like "compressed sensing" is throwing some data out but not while lossy compression, but before that - at the recording stage.
Using Cd analogy it would be like that:
Lossy compression way: record album at 24bit/192 khs (huge file), then downsample to 16/44 (big file - red book CD), rip to a lossy compressed format e.g. mp3 or AAC (small file).
Compressed sensing: record using compressed sensing directly to a lossy format (small file).

So do I want it for my music? No.

Are there benefits elsewhere (in other aplications/ways). Most certainly yes.

 

[shooter]

FrankHarveyHiFi:
They were at the time, but not sure why Pioneer dropped it. I say PDS, the PDS was referring to the transport mechanisms, which were stable platter, but it was mostly these that used Legato Link. This was a mathematical procedure which was designed to put in the harmonic frequencies above 20kHz that are brick walled by CD's. This was done on the basis that what we hear below 20kHz is affected by what we can't hear above, which was never there on the CD, but is/was/might've been on the vinyl.

It's a real shame Pioneer didn't produce a Stable Platter CD transport with a separate Legto Link DAC - that'd have been interesting....

I had one of those Link Legato Pioneer's years ago bought it from a catalogue, Freemans i think. To be honest i didn't know what i had at the time. When i traded it in at Audio T later on he started telling me all about it and what a good machine it was. I still traded it in though!

 

[Anonymous]

It would be a lot easier to do it the other way round: no compression on the mastering / original CDs, but then incorporate compression software in MP3s, car hifi etc.

 

[FunkyMonkey]

I'm sure the game Alien Triology on the original (2 channel) Playstation had Q sound!

 

[Frank Harvey]

bretty:Is the 'Legato Link' technology similar to the adjustable 'Dither' that I have on my Rotel RCD-991?

Not quite. The 991's 'dither' control was just adding distortions to make it sound different.

 

[Frank Harvey]

bernasmeister:Sting did an album using Qsound as well... The "All this time" track had quite an impressive 3D effect when played on vinyl.

Soul Cages. Roger Waters used it on Amused To Death too. There were quite a few around in the early 90's.

 

[Frank Harvey]

FunkyMonkey:I'm sure the game Alien Triology on the original (2 channel) Playstation had Q sound!

It may well have done, it was around the right time.