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In Reply to: Re: ASIO & bit rates posted by aljordan on October 25, 2006 at 14:43:34:
Alan> Are you upsampling a full resolution file or something lower like an MP3 file?
I had been considering upsampling of normal full resolution on playback.You reminded me how little I knew about sampling rates – for which I am thankful, so I did some reading at wikipedia.
I can’t hear beyond 13 kHz, so std Red book 44.1 khz should do me.> There is a general consensus that ASIO drivers sound better because they bypass the Windows mixers and such.
What is the negative of Windows Kmixer, and does it matter for audiophile playback off a PC hard drive, or just for those recording?
Follow Ups:
While a sampling rate will determine the maximum range of frequencies that can be recorded, there are other benefits to higher sampling rates. A sampling rate of 44.k means that 44100 16 bit long "words" are recorded per second. The more words that are recorded per second, the more information that can be captured. I higher sampling rate should sound smoother up to a point. Also, using longer word lengths, 24 bits instead of 16 bits, allow higher dynamic range and allow noise to be pushed into an inaudible frequency range.
" ... The more words that are recorded per second, the more information that can be captured. ... higher sampling rate should sound smoother up to a point. Also, using longer word lengths, 24 bits instead of 16 bits, allow higher dynamic range and allow noise to be pushed into an inaudible frequency range. ..."Yes it does: 24 bits has much more audio information than 16 bits and the dynamic range can be greater than 140 db in the conversion to and from analog to digital and back.
But this in not "inaudible" ... and almost anyone can hear the difference.
Play a CD of 16 bit music on a DVD-A capable player, then play the DVD-A version of the same album ... the differences are dramatic. (If you can't hear the differences it can only be because some component of your system is squeezing or compressing the 24 bit words back to 16 bits.)
Best example I know of: there ar no quality recording studios using 16 bit or 18 bit or 20 bit analog to digital components to make master recordings. It is all multichannel 24 bit / 96k or 24 bit / 192k or better. No professional musician I know of will allow it for their masters and no professional recording engineer will even suggest it.
Alan> The more words that are recorded per second, the more information that can be captured. higher sampling rate should sound smoother up to a point.
Also, using longer word lengths, 24 bits instead of 16 bits, allow higher dynamic range and allow noise to be pushed into an inaudible frequency range.so the ability to upsample *may be desirable . . .
Do eg foobar, J River, mp3toys, iTunes allow upsampling to say 96 kHz? Or is that determined by the soundcard?
The soundcard has to support output of whatever rate you want to upsample to. My M-Audio cards support upsampling to 96Khz. Some cards will support up to 192Khz, and others only to 48Khz.There are plugins for Foobar that support upsampling. One is included with the distribution, and another plugin called Secret Rabbit Code offers a better algorythm. I have heard that J River supports upsampling but have not been able to confirm it myself.
I don't know about i-tunes now mp3toys. I have been using Foobar for music, although I may try J River soon.
Alan
(Mine also supports 96 kHz)As only audiophiles are likely to want this high(?), maybe few media players will (?), and those that do will, will be with plugins
Search!
If I had ample time my friend, but I can't be too distracted from my other projects
Baloney! Time to post = time to search.
Don't be such a jerk - time to reproach = time to respond. Or to extract head from anus.
Why would I respond when it's all been spelled out before? Civilisation is built on the written word and the ability of people to extract information from what's written without constant hand-holding.It would be to their own great benefit if chronic questioners would realise they learn much more when their ears are open and their mouth is shut. I've had a few private conversations with Rick about this (we're actually friends.) It's not that nobody should ever ask questions. It's that some effort should be made to absorb material and find answers on your own before shooting off every question that comes to mind. It's almost like they think it's someone else's job to make them understand. So I agree completely with the extracting of the head from anus part.
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