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In Reply to: RE: What is your capture hardware? posted by Archimago on June 16, 2013 at 08:28:48:
"It's the E-MU 0404USB 'pro'/consumer ADC device which works pretty well up to 24/192 with about 19-bit resolution."
More like 16 or 17 as Thorsten says. This is about the same as I get with my juli@ sound card. If you still don't understand the issue of FFT gain then I suggest you do so before doing additional experiments.
It's not necessary to do any maths to understand the issue from a practical standpoint. It can be seen readily using simple tools such as an audio editor. These have the ability to generate test signals (e.g. silence) and do format conversions (e.g. dither). They also include FFT analysis capability that allows control over FFT size as well as FFT window. For example, dither noise at 44/24 measures out at -176 dB as plotted by SoundForge 10c, using a 65K Blackman-Harris window. (In addition to effects of FFT size and window, there will be slight differences in plots with different software due to various reference level issues, but these differences will probably not be more than 3 dB.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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- RE: What is your capture hardware? - Tony Lauck 10:05:11 06/16/13 (0)
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