Support and General Use > Recording
Recording via optical-in
LinusN:
--- Quote from: manno on April 25, 2006, 10:07:43 PM ---They both came out ok EXCEPT that I fed it a 24-bit/48khz signal and it downsampled it to 44.1khz and trucated it to 16-bit.
--- End quote ---
Using more than 16 bits will put a substantial strain on the CPU, since we can't use DMA in that case.
Rockbox does not downsample to 44.1kHz when recording. However, it always downsamples to 44.1kHz when playing back the file.
mborus:
Also did some more tests yesterday.
I recorded one hour from a CD twice and compared the result.
As with the shorted test both files were identical. So not a single
glitch.
The only "problem" I had was starting the recording and the CD
at the same time, without missing the beginning.
BTW, the optical output is not working during the recording.
manno:
--- Quote from: LinusN on April 26, 2006, 02:16:13 AM ---
--- Quote from: manno on April 25, 2006, 10:07:43 PM ---They both came out ok EXCEPT that I fed it a 24-bit/48khz signal and it downsampled it to 44.1khz and trucated it to 16-bit.
--- End quote ---
Using more than 16 bits will put a substantial strain on the CPU, since we can't use DMA in that case.
Rockbox does not downsample to 44.1kHz when recording. However, it always downsamples to 44.1kHz when playing back the file.
--- End quote ---
I fed it a 48khz signal and the resulting file was at 44.1khz. I'll double check my settings again....
Isn't writing out 20 bits of data more of an I/O strain than a CPU strain? Is there a possibility of maybe testing it out?
UPDATE- I checked all my setting and made sure that it was being sent a 48khz signal and it is but still downsampling to 44.1khz no matter what I do. Isn't it hardcoded into the patch to only do 44.1 at this time?
pabouk:
--- Quote from: manno on April 26, 2006, 11:36:41 AM ---I checked all my setting and made sure that it was being sent a 48khz signal and it is but still downsampling to 44.1khz no matter what I do. Isn't it hardcoded into the patch to only do 44.1 at this time?
--- End quote ---
Is not the resulting wav in fact 48 kHz PCM data with just a 44.1 header? Is not the recored wav time length about 9% bigger and does not the sound have a lower pitch?
mborus:
--- Quote ---Is not the resulting wav in fact 48 kHz PCM data with just a 44.1 header? Is not the recored wav time length about 9% bigger and does not the sound have a lower pitch?
--- End quote ---
That's what I got when I tried 48 kHz.
I opened the file in Audacity and selected the correct sample rate (48 kHz) and
afterwards it played OK.
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