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24/88.2 FLAC clip from Handel's Messiah, Linn Records
mixminus1
post Feb 12 2011, 22:27
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Attached File  13._.Chorus.For.unto.us.a.child.is.born.1min21sec_1min45sec.flac ( 7.74MB ) Number of downloads: 1016


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2Bdecided
post Mar 4 2011, 14:02
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Here are bits 17-24 (only) from each sample of the above file, moved to bits 2-9 so you can hear them.

Warning: quite loud! (Far louder than the original file).
Warning: DC offset (bit 1 not used, hence all values are positive).

Attached File  13._.Chorus.For.unto.us.a.child.is.born.1min21sec_1min45sec_proc.flac ( 4.52MB ) Number of downloads: 172


EDIT: generated in MATLAB using manual bit shifting. DSP or assembler would have been far more efficient, but I believe the MATLAB result is correct.

This post has been edited by 2Bdecided: Mar 4 2011, 14:30
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IgorC
post Mar 6 2011, 13:18
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QUOTE (2Bdecided @ Mar 4 2011, 10:02) *
Here are bits 17-24 (only) from each sample of the above file, moved to bits 2-9 so you can hear them.

Warning: quite loud! (Far louder than the original file).
Warning: DC offset (bit 1 not used, hence all values are positive).

Attached File  13._.Chorus.For.unto.us.a.child.is.born.1min21sec_1min45sec_proc.flac ( 4.52MB ) Number of downloads: 172


EDIT: generated in MATLAB using manual bit shifting. DSP or assembler would have been far more efficient, but I believe the MATLAB result is correct.


Don't want to be harsh but what purpose of such extraction? Point me if I am wrong but separated less significant bits (17-24) don't mimic the original signal and contain pure quantization differences/errors (noise).

P.S. I don't know if it's placebo but I hear some background intelligible sounds

This post has been edited by IgorC: Mar 6 2011, 13:26
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bandpass
post Mar 6 2011, 14:14
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QUOTE (IgorC @ Mar 6 2011, 12:18) *
Don't want to be harsh but what purpose of such extraction? Point me if I am wrong but separated less significant bits (17-24) don't mimic the original signal and contain pure quantization differences/errors (noise).

P.S. I don't know if it's placebo but I hear some background intelligible sounds

Whatever should be in those LSBs, it clearly shouldn't be white noise.

P.S. If you listen to white noise for long enough, you'll eventually hear the sound of monkeys typing out the works of Shakespeare... wink.gif
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IgorC
post Mar 6 2011, 14:33
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QUOTE (bandpass @ Mar 6 2011, 10:14) *
Whatever should be in those LSBs, it clearly shouldn't be white noise.

Not white, but quantization noise.

*Stupid* Example:

Imagine you've done 3 measurements with 24-bit tool of length measurement. 10.3/12.2/13.1 cm . As you can see it's increasing function
After that you've done exactly the same 3 measurements but now with 16 bit tool 10/12/13 cm. It's still the same function with the same characteristics but less precise.

Now extract those (17-24) bits >
10.3 -10 = 0.3
12.2 -12 = 0.2
13.1 - 13 = 0.1

Your final function is 0.3/0.2/0.1 - totally different function with decreasing character and has nothing in common with original function!!!



So, I'm not saying that LSBs (17-24) are useless and don't contain useful data but I think (and might be wrong) that _without_ MSBs those bits have nothing in common with original signal.

This post has been edited by IgorC: Mar 6 2011, 14:41
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