MATLAB CONTROL SYSTEM TOOLBOX 9 Dokumentacja Pobierz pdf (Strona 418)

100

101

filt

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16filt

Purpose Specify discrete transfer functions in DSP format

Syntax sys = filt(num,den)

sys = filt(num,den,Ts)

sys = filt(M)

sys = filt(num,den,'Property1',Value1,...,'PropertyN',ValueN)

sys = filt(num,den,Ts,'Property1',Value1,...,'PropertyN',ValueN)

Description In digital signal processing (DSP), it is customary to write transfer functions

as rational expressions in and to order the numerator and denominator

terms in ascending powers of , for example,

Thefunction

filt isprovided to facilitatethespecificationoftransfer functions

in DSP format.

sys = filt(num,den) creates a discrete-time transfer function sys with

numerator(s)

num and denominator(s) den. The sample time is left unspecified

(

sys.Ts = -1) and the output sys is a TF object.

sys = filt(num,den,Ts) further specifies the sample time Ts (in seconds).

sys = filt(M) specifies a static filter with gain matrix M.

Any of the previous syntaxes can be followed by property name/property value

pairs of the form

'Property',Value

Each pair specifies a particular LTI property of the model, for example, the

input names or the transfer function variable. See LTI Properties and the

set

entry for additional information on LTI properties and admissible property

values.

Arguments For SISO transfer functions, num and den are row vectors containing the

numerator and denominator coefficients ordered in ascending powers of .

For example,

den = [1 0.4 2] represents the polynomial .

1–

()

2 z

1–

10.4z

1–

2–

---------------------------------------------

1–

10.4z

1–

2–

1 2 ... 413 414 415 416 417 418 419 420 421 422 423 ... 590 591

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