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sample rate + latency
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___Reece
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Posted : Oct 9, 2001 12:31:36
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just out of curiosity, and this may be quite obvious to many, - but, why is it that if u work with a higher sample rate (eg. 24 bit/96 khz) then latency on the soundcard is lower?
in my reasoning i thought it would be the reverse - bigger files=more work
i dont have a 24 bit card so any info is appreciated!
thanx in advance:)
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___PsyTom
Old Forum Member
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Posted : Oct 9, 2001 16:06:37
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I guess it's because the card's DSP have to down-render it's processing capabilities in real time (the DSP in designed to process files in the highest sample rate it's capable of).
Because of that, it takes more time for the DSP to process files in lower sample rates than in higher ones.
Tom |
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___Unbalanced
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Posted : Oct 9, 2001 19:55:11
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hey .. my question is a bit of topic but..
does the APS audio card is a 24 bit card ?
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___Reece
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Posted : Oct 11, 2001 03:31:13
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PsyTom, what about non-DSP 24 bit cards? - same thing? - they're just designed to work optimally at 24 bit?
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___Reece
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Posted : Oct 11, 2001 03:35:36
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Unbalanced, APS card? - u mean EMU or Soundblaster? or neither? - not sure about emu but creative have just released a new 24 bit card, with asio 2 drivers! :) |
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___bilbobagginz
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Posted : Oct 11, 2001 08:32:49
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Reece, if you mean "audigy" then better don't buy it, because the A/D D/A of that card are 18 bit (or 20 - i'm not sure)
about the 24 cards. if we talk about such cards as pulsar/luna, i don't think there should be a significant latency change, because they have different latency compensations in soft and in hard.
about the rest (all of them have some kind of DSP on them), it's a matter of format.
most cards encode the audio into PCM (wav).
go and see the specs of this format and you'll understand why the latency rises if the data is not represented in the most comfortable way..
(casting/conversion - consume CPU)
ciao!
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___Reece
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Posted : Oct 11, 2001 13:54:35
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no way i'd buy another soundcard from creative:)
thanx all! |
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___bernoli
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Posted : Oct 11, 2001 15:53:01
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what about blaster live platenium? |
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___bilbobagginz
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Posted : Oct 11, 2001 17:51:49
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sorry for desinformation, dear people!!!
i wrote some real crap in the previous post... why nobody stopped me?
the card sux, it's true but:
AD/DA's are 24 bit.
recording is 16bit@48khz,
and playback can be 24 bits@96khz.
supposing this card is used for recording....
where will i get 24/96 samples from?
well ... sorry for the mistakes.
BOM
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___Unbalanced
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Posted : Oct 11, 2001 20:32:36
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hi i meant the EMU - APS
is it 24 bit card ?
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___sophicos
Old Forum Member
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Posted : Oct 11, 2001 22:41:26
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hmmm, why dont you check the e-mu web site man ???
they have all the info you need about your soundcard...so a your manual that you got with it , the box ...etc. :) |
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___Reece
Old Forum Member
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Posted : Oct 12, 2001 13:25:49
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Unbalanced, - im pretty sure the Emu card is 16 bit/48 Khz..... |
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___Reece
Old Forum Member
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Posted : Oct 12, 2001 13:36:49
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What?!?!?!
why would they make a card to playback 24bit but not record it???
seems rather silly to me!
must check the creative website for this one.......
:)
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___bilbobagginz
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Posted : Oct 12, 2001 13:51:46
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APS is a card that uses the same DSP as sblive.
it works in 16/48khz
the chipset is called emu10k1
reece, yes (i know this info sounds stupid), i verified this via the site.
bom
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___Reece
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Posted : Oct 14, 2001 04:26:00
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hehehe........creative have out done themselves once again!..........hehehe
:) |
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