MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications télécharger pdf (Page 563)

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The polynomials and are then specified by the row vectors

[1 0 0] and [1 2 3], respectively. By contrast, DSP engineers prefer to write

this transfer function as

and specify its numerator as

1 (instead of [1 0 0]) and its denominator as

[1 2 3].

tf switches convention based on your choice of variable (value of the

'Variable' property).

For example,

g = tf([1 1],[1 2 3],0.1)

specifies the discrete transfer function

because is the default variable. In contrast,

h = tf([1 1],[1 2 3],0.1,'variable','z^-1')

uses the DSP convention and creates

Variable Convention

'z'

(default) Use the row vector [ak ... a1 a0] to specify the

polynomial (coefficients ordered in

descending powers of ).

'z^-1', 'q' Use the row vector [b0 b1 ... bk] to specify the

polynomial (coefficients in

ascending powers of or ).

2z 3++

1–

()

12z

1–

2–

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

... a

++ +

1–

... b

k–

+++

1–

()

z 1+

2z 3++

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

1–

()

1 z

1–

12z

1–

2–

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

zg z()==

1 2 ... 558 559 560 561 562 563 564 565 566 567 568 ... 590 591

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MATLAB CONTROL SYSTEM TOOLBOX 9 Spécifications Page 563

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