This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.


Frequency response bandwidth


fb = bandwidth(sys)
fb = bandwidth(sys,dbdrop)


fb = bandwidth(sys) computes the bandwidth fb of the SISO dynamic system model sys, defined as the first frequency where the gain drops below 70.79 percent (-3 dB) of its DC value. The frequency fb is expressed in rad/TimeUnit, where TimeUnit is the time units of the input dynamic system, specified in the TimeUnit property of sys.

For FRD models, bandwidth uses the first frequency point to approximate the DC gain.

fb = bandwidth(sys,dbdrop) specifies the critical gain drop in dB. The default value is -3 dB, or a 70.79 percent drop.

If sys is an S1-by...-by-Sp array of models, bandwidth returns an array of the same size such that

fb(j1,...,jp) = bandwidth(sys(:,:,j1,...,jp))

See Also


Introduced before R2006a

Was this topic helpful?