come già detto, io uso questo (non è free):
www.virtins.com
è uscita la versione 2, con importanti novità:
Version 2.0
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Released on Jan. 18, 2006
[+] Added 24 bit support for both input and output.
[+] Added Octave analysis in Spectrum Analyzer. Standard octave, 1/3
octave, 1/6 octave, 1/12 octave and 1/24 octave analyses are
included.
[+] Added inter-frame averaging options in Spectrum Analyzer, including
None, Peak hold and Averaging.
[+] Added display THD, THD+N and SINAD option in Spectrum Analyzer.
[+] Added standard dBV and dBu display options in Spectrum Analyzer.
[+] Added Chart Type option in Oscilloscope and Spectrum Analyzer.
Supported chart types are: Line, Scatter, Column, Bar and Step.
[+] Added wave file operation features include wave file combination
and partial data extraction under File Menu.
[+] Added "Auto Run after startup" option in Display Setting Dialog
[+] Added context menus for Oscilloscope and Spectrum Analyzer.
[+] Added "Slow" Trigger Mode support.
[+] Added cursor reader which sticks to the nearest actual measurement
data point.
[*] Upgraded to second generation Virtins sound card data acquisition
engine.
[*] Improved triggered waveform display stability in Oscilloscope
[*] Removed maximum 1024-point limitation in Waveform library in Signal
Generator
[*] Changed the markers from being placed at the cursor position to
sticking to the poistion of the nearest actual measurement data
point
[!] Fixed the Wrong spectrum display problem when Oscilloscope is in "+"
or "-" mode.
Giovanni
MEMENTO AVDERE SEMPER