Signal Analyzer-User Manual by djh75337

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									                                                                SIGNAL ANALYZER - USER MANUAL


                           Signal Analyzer - User Manual
What is Signal Analyzer?
Signal Analyzer is a combined oscilloscope / spectrum-analyzer plugin for inspecting signals in realtime in
the time- and frequency domain. The plugin displays the signals (or spectra) of two input channels (which
are mostly left and right channel of a stereo signal) in blue and green respectively. The mode of operation
(oscilloscope or spectrum-analyzer) can be selected via the ’Display’ menu in the top left part of the user
interface. In both modes, you can freeze the current content of the display with the ’Freeze’ button to the
right. With a right click on the display, you can also export the current content of the display as a .png
image file or a .svg vector graphics file.

The Oscilloscope/Waveform View




When the option ’Signal’ is selected in the ’Display’ menu, the time signal itself will be displayed in an
oscilloscope like fashion. To adjust the time window which will be shown, use the horizontal zoom-widgets
at the bottom right of the display itself or alternatively the mouse-wheel. To synchronize the display to
the signal, the ’Sync’ menu should be used. At the moment the only option here (other than no sync at
all) is a synchronization to the zero crossings of a lowpassed version of the input signal (option ’Lowpass
Zeros’). For (quasi) periodic signals, this will have the effect to show a more stable waveform.




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The Spectrum View                                               SIGNAL ANALYZER - USER MANUAL


The Spectrum View




When the option ’Spectrum’ is selected in the display menu, you will see a spectral analysis plot of the
incoming audio signal. The menu ’Method’ provides at the moment only the option ’Fourier Transform’
which means, that the signal spectrum is estimated by the ubiquitous FFT algorithm. The menu was
already included for future inclusion of other spectrum estimation methods. The ’Size’ menu next to
it, chooses the FFT blocksize which will be used. The ’Log’ button toggles logarithmic scaling of the
frequency axis on (or off). To see a section of the spectrum in greater detail, you can use the zoom- and
scroll-widgets in the same way as in the oscilloscope view. Of course, freezing and export is available here
as well.

Credits
   • Thanks to Takuya OOURA for the FFT library which empowers the spectrum analyzer in this
     plugin. The project can be found on:
     http://momonga.t.u-tokyo.ac.jp/ ooura/fft.html

   • Thanks to Julian Storer for the JUCE framework, on which the graphical user interface (GUI) and
     a lot of other things in this plugin are based. It can be found here:
     http://www.rawmaterialsoftware.com/juce

   • VST is a trademark of Steinberg Media Technologies GmbH




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