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Topic: SoX downconversion (Read 3586 times) previous topic - next topic
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SoX downconversion

I'm including all this just in case anyone is interested in trying the comparisons--definitely not asking anyone to waste time going over all this.
No claims of validity or reliability are being made here--all of that could ONLY occur under controlled laboratory conditions. The following is just doing what's possible in forum format online.

The original source file for conversion (saving space here) is available online at http://www.naimlabel.com/musicstore-test-files.aspx z
The original file would be the very last line on this page, the Classical in WAV, 192/24
I used it renamed as Beeth_192.wav

SoX was downloaded from Sourceforge, command line used was adapted from an example here: http://smyck.net/2014/01/18/resampling-con...ng-audio-files/

sox Beeth_192.wav -b 16 Beeth_44.wav rate -v -s 44100  (with my own filenames, of course)

Further SoX recipes welcome.

SoundForge reports these Statistics for the 192/24:
                                                 Left Channel           Right Channel     
Cursor position (Time)           00:00:00.000           00:00:00.000       
Sample value at cursor (dB)     -Inf.                         -Inf.             
Minimum sample position (Time)   00:00:04.832           00:00:03.639       
Minimum sample value (dB)       -0.091                         -0.361             
Maximum sample position (Time)   00:00:05.207           00:00:04.019       
Maximum sample value (dB)       -0.644                         -1.380             
RMS level (dB)                           -16.607               -17.188           
Average value (dB)               -101.089               -99.885           
Zero crossings (Hz)                     763.96                 692.57       

SoundForge reports these Statistics for the 44.1/16:   
                                                 Left Channel           Right Channel     
Cursor position (Time)           00:00:00.000           00:00:00.000       
Sample value at cursor (dB)     -Inf.                         -Inf.             
Minimum sample position (Time)   00:00:04.832           00:00:03.639       
Minimum sample value (dB)       -0.116                         -0.369             
Maximum sample position (Time)   00:00:05.207           00:00:04.019       
Maximum sample value (dB)       -0.653                         -1.417             
RMS level (dB)                           -16.607               -17.187           
Average value (dB)               -Inf.                         -Inf.             
Zero crossings (Hz)                     756.16                 685.10             

[attachment=8236:Beeth_44.wav]Comparison between the original and the SoX conversion yielded non-significant results at alpha = .05
Results posted in this thread: http://www.hydrogenaud.io/forums/index.php?showtopic=108758
Specific result for testing this down-conversion is at:




 
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