I have got the same song twice, but the one is ripped in surround sound and the other in stereo.
It looks like this in Spek:
The 5.1 file shows much lower statistics, but the 5.1 is about 3100 kBit/s and the 2.0 about 800. I'm not familiar with audio files, so can you tell me why this is?
Btw. both are level 0 compressed.
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Last edited by KarMa; 15th Dec 2016 at 18:20.
Seem 5.1 is less louder and as 24 bit free from noiseshaping. You should align (level) on both - 120dB is approx 20 bit dynamics.
Yes, I mean the high end of the spectrum. I tried a bit around with Ctrl + Up/Down, but the 5.1 is significantly lower in high-end. I couldn't notice a noise difference. I guess some subliminal sounds are different here. Ok, not that important. But what do you mean by noiseshaping? What is that sky-ish looking area in top of the right graphics? The song was ripped from the same CD, one time 5.1 and the other time 2.0 - and it originally is 5.1.
Btw you say 120 dB is good for 20 bit. What shall I use for 16 and what for 24?
Noise shaping is a way to reduce quantization noise at desired part of audible spectrum at a cost of increase of overall noise - this is exactly
Amplitude statistic should explain differences (i think CD may have reduced dynamics by gain compression and overall signal levels higher - clearly different spectrum).
Bellow is SoX https://sourceforge.net/projects/sox/ spectrum analyzer script - we should be able to see whats going on bellow -120dBFS.
@set dyna=180 @set /a clut=%dyna%/5 @sox --multi-threaded --buffer 524288 -S -V -D "%1" -n spectrogram -z %dyna% -w Kaiser -q %clut% -y 1025 -x 2048 -s -o "%~n1_%dyna%dB.png" stat stats -b 16
Last edited by pandy; 16th Dec 2016 at 14:29.
The program used to export the stereo flac file used dithering -- hence the high frequency noise.