powerbw
Power bandwidth
Syntax
Description
specifies the frequency interval over which to compute the reference level. This
syntax can include any combination of input arguments from previous syntaxes, as
long as the second input argument is either bw
= powerbw(___,freqlims
,r
)fs
or
f
. If the second input is passed as empty, normalized
frequency will be assumed. freqlims
must lie within the
target band.
If you also specify r
, the function computes
the difference in frequency between the points where the spectrum
drops below the reference level by r
dB or reaches
an endpoint.
powerbw(___)
with no output
arguments plots the PSD or power spectrum in the current figure window
and annotates the bandwidth.
Examples
Input Arguments
Output Arguments
Algorithms
To determine the 3-dB bandwidth, powerbw
computes
a periodogram power spectrum estimate using a rectangular window and
takes the maximum of the estimate as a reference level. The bandwidth
is the difference in frequency between the points where the spectrum
drops at least 3 dB below the reference level. If the signal reaches
one of its endpoints before dropping by 3 dB, then powerbw
uses
the endpoint to compute the difference.
Extended Capabilities
Version History
Introduced in R2015a
See Also
bandpower
| obw
| periodogram
| plomb
| pwelch