Daqarta
Data AcQuisition And RealTime Analysis
Scope  Spectrum  Spectrogram  Signal Generator
Software for Windows Science with your Sound Card! 

The following is from the Daqarta Help system:

Features:OscilloscopeSpectrum Analyzer 8Channel

Applications:Frequency responseDistortion measurementSpeech and musicMicrophone calibrationLoudspeaker testAuditory phenomenaMusical instrument tuningAnimal soundEvoked potentialsRotating machineryAutomotiveProduct testContact us about


Sound Card Spectrum Xlog Toggle Controls: Spectrum Dialog >> Xlog
This button also appears as the Xlog Spect button in the XAxis Control Dialog. Alternatively, you can toggle Xlog mode via ALT+SHIFT+X whenever Spectrum mode is active, regardless of which dialog is visible. This option allows the Spectrum X axis to be shown with logarithmic scaling. Combined with the Ylog power spectrum mode to get a loglog display, this is a standard method for viewing scientific and engineering data of all sorts, especially where wide ranges must be shown in a single view. Since this mode just replots the same data with a different spacing, you will note that lowfrequency points are far apart and highfrequency parts are close together or even overlapping. Many phenomena that show an exponential response on a linear scale become linear on a loglog scale. A typical example of this is the behavior of a simple lowpass filter: Above its cutoff frequency, the output falls off proportional to the inverse of frequency. In log terms, this halving for each frequency doubling is usually expressed as a slope of "6 dB per octave" or the equivalent "20 dB per decade". For a filter whose response falls as the inverse square of frequency, the loglog slope would be 12 dB per octave, and for the inverse cube it would be 18 dB per octave. The loglog slope, properly interpreted, is thus a measure of the mathematical "degree" of the underlying equation of a simple system, be it mechanical, electrical, or whatever. Although there are many pitfalls to using this idea to analyze an unknown system, it can be very useful when carefully applied to wellbehaved systems. Another example where a loglog plot is useful is in viewing a pink noise source. In loglog mode, the spectrum (after enough averaging), appears as a straight line that shows a 3 dB / Octave downward tilt that is characterstic of pink noise. Note that if you use the XAxis eXpand function while in Xlog mode, the settings are kept separate from those of linear Xaxis mode. Macro Notes: Xlog=1 sets Spectrum Xlog mode, Xlog=0 restores linear X axis, and Xlog=x toggles between them. See also Spectrum Control Dialog 

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