Metric Halo SpectraFoo - Manual (Page 108)

Quick Menu Reference
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Analyzer
The Analyzer Menu allows you to change the resolution of the Analyzer. Although you can switch the reso-
lution of the analyzer to less than 4096 points, SpectraFoo is so fast that we can’t see why you would want
to (if the computer you are using is especially slow, or if it does not have any cache, you may want to lower
the analyzer resolution in order to gain some speed at the expense of frequency resolution). You can also use
this menu to increase the resolution of the analyzer. The 8192pt setting is a good compromise between speed
and resolution on fast machines.
The Remove DC Offset command allows you to remove any residual DC offset from the input converters. If
the Spectragraph shows a hump at 0 Hz, even with no input signal present, mute the input to SpectraFoo and
select the Remove DC Offset command to remove the DC offset from the input.
The Reset Analyzer command causes the analyzer to disconnect and the reconnect itself from the selected
input hardware. It can be used if the system appears to be behaving strangely (No instrument updates, or severe
digital distortion).
The Level Calibration command allows you to set a reference value for Digital Full Scale (0 dBFS). This window
also contains the utilities to determine when a full scale sample is detected, and how many consecutive full
scale samples constitutes a clip.
Finally, the Analyzer menu contains the command to show/hide the Signal Generator. Control of the Signal
Generator is covered elsewhere in this documentation.
Audio I/O
Configure Hardware… This item will open SpectraFoo's hardware setup window:
Figure 11.4: Hardware Configuration Window
• CA Driver: The items in this menu will reflect any supported third-party interfaces, as well as the built-
in audio interface of your computer. You may select which audio device SpectraFoo uses for analysis
from here.
• Sample Rate: You may select any sample rate that is supported by the interface selected by the CA
Driver menu.
• Buffer Size: This menu allows you to set the size of the CoreAudio buffer your interface will use (in
samples). Larger buffer values will improve performance on slower machines at the expense of latency.
Smaller buffer values will improve SpectraFoo's analysis speed but require more processing power. The
buffer size also controls how much data certain instruments display in each update. These instruments
include the Oscilliscope, Lissajous Phase Scope, Code List Meter, and the Bitscope.
The Monitor Input command allows you to control how the software passes audio from its input to its output.
If this item is checked, the audio will be passed. If it is unchecked, the audio will be muted. If you are using