Sample Rate And Bitrate Not Allowed ... ?

I have almost 70GB of my music in my iTunes, ALL in AAC 320kbps 48Khz. Now that I just updated to iTunes 9, I just tried to add more of my new CD's to my library and they are being imported at 44Khz...?? I went to change it back to 320/48 and I get ...
"The selected combination of bitrate and sample rate is not allowed"
Bug? Anyone else have this problem? HELP!
btw ..I tired to use my laptop and my work PC to see if it's just this machine that is causing the problem....and those too (now updated to iTunes 9) are doing the same thing.

I don't know why a previous version might have allowed a 48khz sample rate, but audio CDs are 44.1kHz (that sample rate is locked into the Red Book CD standard) so there would be no good reason I can think of to attempt to import at a 48KHz sample rate. It won't increase quality and could cause artifacting.
Regards.

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Changing sampling rate and bitrate

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If I import recordings as AIFFs or WAVs to iTunes it shows the recording parameters in iTunes, but my old Yamaha processor which accepts PCM doesn't show the source data values, though I know it can handle 96kHz 24bit from DVD audio.
It takes no more time recording at any available sample rates or bit depths, so I might as well maximise an album's recording quality for archiving to DVD/posterity as I only want to do each LP once!
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1. I need to have more data points, thus I increase the sampling rate(SR). When sampling rate is increased, Block size(BS) will increase correspondingly.
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Generally, the DASYLab sampling rate to block size ratio should be between 2:1 and 10:1.
If your sample rate is 1000, the block size should be 500 to no smaller than 100.
Very large block sizes that encompass more than 1 second worth of data often cause display delays that frustrate users.
Very small block sizes that have less than 10 ms of data cause DASYLab to bog down.
Sample rate of 100 samples / second and a block size of 1 is going to cause DASYLab to bog down.
There are many factors that contribute to performance, or lack there of - the speed and on-board buffers of the data acquisition device, the speed, memory, and video capabilities of the computer, and the complexity of the worksheet. As a result, we cannot be more specific, other than to provide you with the rule of thumb above, and suggest that you experiment with various settings, as you have done.
Usually the only reason that you want a small block size is for closed loop control applications. My usual advice is that DASYLab control is around 1 to 10 samples/second. Much faster, and delays start to set in. If you need fast, tight control loops, there are better solutions that don't involve Microsoft Windows and DASYLab.
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Q2 - without knowing more about your hardware, and the driver, I'm not sure that I can fully answer the question. In general, the DASYLab driver instructs the DAQ device driver to program the DAQ device to a certain sampling rate and buffer size. The DASYLab driver then retrieves the data from the intermediate buffers, and feeds it to the DASYLab A/D Input module. If the intermediate buffers are too small, or the sample rate exceeds the capability of the built-in buffers on the hardwar, then data might be overwritten. You should have receive warning or error messages from the driver.
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Ringmaster wrote:
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I guess I had better keep all of them in this format. It might make a difference if I decide to burn CD's; also, all of my back ups will be of the same format.
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Sample Rate And Bitrate Not Allowed ... ?

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