Metric Halo SpectraFoo - Manual (Page 38)

Instruments
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Figure 3.35: Transfer Function Created From Two Spectral Snapshots
You can use this tool for a variety of purposes. One application is for measuring system response with an RMS
average instead of the normal vector averaging that is used by the transfer function. This can allow you to
measure approximate system response in the case where the system time delay is not constant (e.g. outdoor
systems in a windy environment, etc.)
This functionality can also be used to make transfer functions between unrelated sound sources (two different
songs, noise floor of two different rooms, etc.)
Spectragram
The Spectragram utilizes the same FFT resolution and scale as the Spectragraph. The display medium correlates
not only frequency and power, but also time. The result is a visual “sonic fingerprint”. Like the Spectragraph,
the true power of this instrument lies in its synchronization with the live audio signal. After spending some time
“calibrating your eyes to your ears” by watching the Spectragram while listening to music which is intimately
familiar, the instrument literally becomes a waterfall of musical information.
This tool is very effective for precisely identifying frequency overlap and masking effects, such as a bass drum
track and a bass track occupying the same frequency range and obscuring each other. It gives you a good
picture of the rhythmic aspects of program material and is very helpful in pinpointing timing problems in dense
arrangements.