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Old 9th May 2013, 01:27 PM   #1
rjm is offline rjm  Japan
Richard Murdey
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Default 24 bit input only 16 bit in Audacity

Windows 8 64 bit, Onkyo SE-200PCI and Onkyo SE-U33 soundcards, both purport to record at 24 bit 96 kHz.

For some reason the file recorded in Audacity shows up quantized at 16 bit (30 uV LSB) instead of 24 bit (0.1 uV LSB). Audacity project is set to 96 kHZ, and the hardware is set to 24 bit 96 kHz in the Windows control panel and/or the VIA envy device driver control panel (for the SE-200 PCI only, the SE-U33 works off the generic windows drivers).

You can see in the screenshot, showing noise after +70dB amplification, the points are about 0.1 V apart, which, after -70dB, works out to 30 uV approximately.

What am I missing here? Where is my data getting truncated to 16 bit?
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Old 9th May 2013, 01:45 PM   #2
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Hmm, I'll answer that myself:

"It's always been known that recording with WMME drivers on Windows is
restricted to 16-bit."

audacity-users - Problem recording @ > 16 bits?

Damn. I'll have to find another software solution then. Any ideas?
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Old 9th May 2013, 02:42 PM   #3
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For the record, I bought a copy of Digionsound6 Express from amazon. Long story, but its the updated (win8 compatible) version of the software than came with my Onkyo SE-U33. It records correctly in 24 bit. Its unfortunately only in Japanese. Fortunately, that's not a major problem for me anymore.

The .wav file from the same source as before, exported from digionsound and imported back into Audacity, amplified +70 dB, has no quantization artifacts as they are now below the (analog) noise threshold.

Take home message: do NOT use Audacity to record 24 bit audio in Windows! The files will only be 16 bit data padded out to look like 24 bit numbers.
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Old 9th May 2013, 02:48 PM   #4
phofman is offline phofman  Czech Republic
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How about using the procedure outlined in the post - recording in ASIO application and importing the file into Audacity?

IME the "default sample format" in project tab of preferences must be switched to 24bit prior to importing for bit-perfect operation of audacity.
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Old 9th May 2013, 03:07 PM   #5
phofman is offline phofman  Czech Republic
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Quite a few very good bitperfect recording tools in linux, free of charge And your cards are fully supported, with "quaranteed" bitperfection by source code availability

Just teasing
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Old 9th May 2013, 07:34 PM   #6
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Did you test the ASIO4ALL (ASIO drivers)?

ASIO4ALL - Universal ASIO Driver

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Old 9th May 2013, 07:59 PM   #7
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Audacity doesn't support ASIO as far as I know because it would require some sort of licensing or similar?
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Old 9th May 2013, 08:05 PM   #8
phofman is offline phofman  Czech Republic
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I do not know much of windows audio but would a WDM driver talked to by the ASIO4ALL shim support 24bits?
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Old 9th May 2013, 09:06 PM   #9
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Quote:
Originally Posted by 5th element View Post
Audacity doesn't support ASIO as far as I know because it would require some sort of licensing or similar?
I just downloaded Audacity and apparently it does not take the ASIO drivers.
I do not use Audacity to sample but Wavosaur it is ASIO.

Wavosaur free audio editor with VST and ASIO support

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Old 9th May 2013, 09:26 PM   #10
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Quote:
Originally Posted by Project16 View Post
I just downloaded Audacity and apparently it does not take the ASIO drivers.
I do not use Audacity to sample but Wavosaur it is ASIO.

Wavosaur free audio editor with VST and ASIO support

Regards!
VST and ASIO, I think we're onto a winner.
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