For instance, two sounds that start at the same instant in time probably come from a single person, even if they involve several different frequency bands. (scientificamerican.com)
An ideal validation procedure would measure skill at different timescales, or in different frequency bands using wavelet or power spectrum calculations. (nap.edu)
As a result, public safety agencies have been forced to spread their signals throughout the four different frequency bands available to them — namely, at megahertz frequencies of 150, 400, 700 and 800. (scientificamerican.com)