Display options
Those include the window size, oscilloscope display, and scrolling speed. It is always
useful to observe the input signal (sound, or neuronal activity) in real time. In SAP2,
however, it is even more critical, because the shape of the input signal us used to
determine values of the sound-detection parameters. Those parameters control the
behavior of the sound activated recording. False negatives (failing to detect a song), or
indiscriminate recording are likely consequences of inappropriate parameter settings.
The default display mode is of side-by-side view of the recorder and processing
applications. Keeping those applications separate promote stability of recording
regardless of analysis issues. When you set the recorder parameters, however, it is
recommended to use the “broad” mode, which allows you to see more details, but also
the ongoing statistics of the real-time analysis of the waveform:


The Oscilloscope Display allows you to choose between regular oscilloscope and a
scrolling display as shown below. The scrolling display allows you to see the amplitude
envelope of the signal scrolling (slowly or fast) from right to left. It will allow you to
identify, for example, song syllables. The horizontal red doted lines represent the
recording threshold. We will talk about this threshold in details shortly, but note how
easy it is to see the cases where signal amplitude passed that threshold. Peak Count is
showing you the number of samples that passed the threshold during the current
“session”.

Keep in mind that SAP2 allows pre-triggering of recording, namely, the recorder keeps a ring buffer of the signal so that it can decide if to save or discard a recording session
retroactively (a few seconds later). Therefore, depending on how selective you like the
recorder to be, you might want to see a larger chunk of sound in the display mode.
Moving the scroll slider to the left allows you to see several seconds of sound signal, e.g.,
to detect a song bout by visual inspection. Of course, the display is irrelevant to the
detection algorithm, but it allows you to judge the behavior of the detector based on your
visual inspection.
Switching to oscilloscope display, now allows you to see the waveform of the data as
shown below:
Switching the speed of the “scrolling will now alter the updating rate of the oscilloscope,
which can be useful while looking for neuronal spikes for example.
Note: The Display of each channel can be set individually (e.g., as scrolling or not)
using the settings menu. When changes are made via the control panel, those
changes immediately apply to ALL channels.
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