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In Reply to: ALL of these use data reduced / non-linear encoding IE WAY LESS info. than CD posted by Timbo in Oz on June 15, 2004 at 18:35:28:
As someone not that knowledgeable about the various forms of data encription, and also not one to get excited about the cd vs. lp eternal debates, (My sota and et2 are in mothballs - too much hassle, sorry) you are saying....1. at least 512kbps needed for good quality analog being converted to digital and then converted back.
2. Sirius is probably using no more than 192 kbps, but unless they tell us, there is no way of knowing exactly.
And it appears obvious they are not gonna tell us what they are doing.
So, how does 192 kbps compare to mp3? Or worse?
I must admit, I do not hear the dynamics I can get with a good cd, but then most cd's are not good, well recorded cds.
I also assume that the math is not as direct a correlation in terms of the psychoacoustics of what we here - 192/512 = 2/5, but it sounds more like 80+%, not 40%. Is that a reasonable perception?
Also, I assume that SACD and DVDa transmissions are even more condensed, to meet the 192 (or whatever) standard? IF they bother at all.
Is the Sirius contention, that the level of compression is variable based on the source material, really likely to be valid, or is it PR?
Thanks for your thoughts.
Mark
Follow Ups:
XM and Sirius both use PAC (Perceptual Audio Coder), a perception-based compression technique similar to MP3 but optimized for low bitrates. I have read that XM and Sirius both have maximum bitrates per channel of 64 kbps.In my opinion, none of this matters. All that matters is how good the programming is. I'd much rather listen to a low-quality encoding of good music than an SACD of crap.
Do read the thread through to the end.just as Zappa sid that most people wouldn't know good music even if it bit them on the arse, MOST decison makers brain fall out at the mention of digital.
"I mean it's better isn't it!?"
Sighhh!
I can hear and I do care.
OTOH, you may find that a better DAC might help, but you are pushing **** up hill! it will be quieter.
Warmest,
Timbo in Oz
The Skyptical Mensurer and Audio Scrounger
Peace
I suggest you temporarily go here and join so you can read fromhttp://groups.yahoo.com/group/FMtuners/
a thread about Sirius from one of our more reliable and level headed couples, living high up in the Rockies.
Tim Britt and Anne Weatherwax.It is not possible for me to go their, get in and copy the beginning and bring it back here, as part of one web session. I could do a Word copy etc.
but they found they increasingly became irritated and grumpy and got headaches. no depth, good bass but.
Timbo in Oz
The Skyptical Mensurer and Audio Scrounger
Peace
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