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RE: You could - and should - do better than citing Lavry's self-serving nonsense.





Note the 60 Hz hum and its odd harmonics. Also the noise which is below -136 dB until 30 kHz, after which it rises to a maximum of -108 dB at 96 kHz. There are also spurious signals at 35 and 57 kHz at -120 dB and -103 dB. The RMS noise measured from DC to 96 kHz is -85 dB. If this file is downsampled to 88/24 the spectrum is chopped off at 44.1 kHz and the RMS noise is reduced to -105 DB. This indicates that most of the noise power in the original recording is at frequencies above 44 kHz.

Keep in mind that this is a cheap sound card running in a computer with lots of noisy electronics and a typical computer power supply. One will see a much better result if one uses a high end analog to digital converter, but there will still be rising noise at higher frequencies due to the delta-sigma converters.

Click on the link below to see a full resolution screen shot.

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar



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