modmix
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Clip Clip value for the same file can differ - folder 1 is on a friend's pc, folder 2 is on my pc. Settings are the same (to the best of our knowledge) Why are there different values for the same file LW 27 ? BTW: What does the Clip value indicate? LW 10.wav has more than 2 values regarded as clipping by audacity TIA Ulli
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Great. sidebar There are reports that a native .wav can produce different sound when compaired to a .wav having metadata included. DW reports in a test with a picture included: BIT PERFECT. Using something like WinDiff confirmes that the PCM data are just identical in both files. For obvious reason just the file length given in the 4 bytes in the header is different - should not cause a sonic impact, I would guess. Metadata are appended at the end of the .wav. Conclusion: in case a sonic difference is heard, the program feeding the data to the DAC may cause some effect - any other ideas?
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Flac is not lossless - according to DW 😉 From B.wav I created B.flac ona Win10 machine. DW identifies this two files as being not BIT PERFECT: DeltaWave v1.0.47, 2019-12-18T13:27:12.4902666+01:00 Reference: B.flac[R] 13242936 samples 44100Hz 16bits, stereo, MD5=00 Comparison: B.wav[R] 13242936 samples 44100Hz 16bits, stereo, MD5=00 Settings: Gain:False, Remove DC:False Non-linear Gain EQ:False Non-linear Phase EQ: False EQ FFT Size:131072, EQ Frequency Cut: 20Hz - 20000Hz, EQ Threshold: -160dB Correct Drift:False, Precision:30 Non-Linear drift Correction:False Upsample:False, Window:Hann Spectrum Window:Hann, Spectrum Size:262144 Spectrogram Window:Hann, Spectrogram Size:4096, Spectrogram Steps:2048 Dither:False Trim Silence:False Enable Simple Waveform Measurement: False Discarding Reference: Start=0s, End=0s Discarding Comparison: Start=0s, End=0s Initial peak values Reference: -4,123dB Comparison: -4,123dB Initial RMS values Reference: -27,303dB Comparison: -27,303dB Null Depth=300dB X-Correlation offset: 0 samples Trimmed 0 samples ( 0,00ms) front, 0 samples ( 0,00ms end) Gain matching disabled. Phase offset=0ms (0 samples) Difference (rms) = -115,25dB [-125,31dBA] Correlated Null Depth=300dB [50,71dBA] Clock drift: 0 ppm Files are NOT a bit-perfect match (match=100%) at 16 bits Files match @ 99,9959% when reduced to 16 bits ---- Phase difference (full bandwidth): 0,215154875193726° 0-10kHz: 0,08° 0-20kHz: 0,09° 0-24kHz: 0,22° Timing error (rms jitter): 0sec RMS of the difference of spectra: -309,189589339198dB gn=1, dc=0, dr=0, of=0 DONE! Signature: ec2049cf2e38aea72b34198b35a603c3 While Delta Waveform and Delta of Spectra both give a ruler-flat line, Spectrum of Delta gives a result I don't understand. The same for Delta Phase. There are two options to export the delta into a .wav (if I got it right): Writing Delta file to: D:\DW_wav-flac\B-wav-flac_FP64.wav Writing Difference file to: D:\DW_wav-flac\B-wav-flac_pcm32+100dB.wav I would expect Spectra+ showing something similar to Spectrum of Delta - this is not the case. What might have this caused? Additional question: any chance to indicate the limit below which difference are due to calculation? Best, Ulli
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Thanks for the clarification Ulli
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hmmm... A 16bit file can have 2^16 distinct values. The difference between values in two 16bit files can be in the range 0 - 2^16 - in steps of one or many bits but not smaller. How does that translate to 24bits?
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You are right if it were done by scaling. For the files in use the lower bits are truncated (with dither ,-) DIGICheck does proof that nicely.
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A 96/24 file is truncated to 96/16 using two different tools. DW Linearity does show 22 bits (2 to 24) - how come? Thanks Ulli
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The access rights in windows need to be adjusted - solved that issue for me. Right click on the file mentioned and find the appropriate settings. hth Ulli
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I wonder what's the best setting to get a good result. A 24bit white noise file is played via Lynx L22 digital out connected to a Soekris DAC1541. The DAC1541 output is recorded from attached L22 analog input (loop with Adobe Audition 3.0). A 20 - 40 dB wide "band" is not what I would expect. Thanks, Ulli BTW: any chance to allow for export e.g. as .csv?
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You have PN.
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Comparing a file with itself needs DriftCorrection=true to give BIT-PERFECT, Does that make sense? TIA Ulli
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Might be usefull in some cases, yes. Would like to have it. TIA Ulli
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would like to learn that, too. Ulli
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Level EQ now gives: Files are NOT a bit-perfect match (match=100%) at 16 bits Files are NOT a bit-perfect match (match=100%) at 24 bits Files match @ 100% when reduced to 12,5 bits ---- Phase difference (full bandwidth): 2,52173587518713E-11° 0-10kHz: 0,00° 0-20kHz: 0,00° 0-24kHz: 0,00° Timing error (rms jitter): 0sec RMS of the difference of spectra: -353,388476384148dB gn=1, dc=0, dr=0, of=0 Quite small difference, now. But: 12,5 bits ?... PS: I really like your program 🙂 Looking forward to see further improvements.