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Mathml mark-up

Ω &omega

Signal

It is sometimes useful to describe an arbitrary signal, or an input/output relationship. In such cases, it is recommendedthat f be used to represent a generic signal. For an input/output relationship, use x as an arbitrary input signal and y as the arbitrary output signal. When writing out the signal as a function of somevariable, such as time, it can be represented as x t for continuous-time signals and as x n for discrete-time signals.

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For a continuous-time signal, x t :

x t

For a discrete-time signal, x n :

x n

Special signals

There are several signals used often enough to merit special attention. They are presented here.

Impulse

The impulse, or Dirac-Delta function , should be presented as δ t in continuous-time and as δ n in discrete-time.

The impulse is a signal which could be given a definitionURL, which in conjunction with csymbol would allow us to facilitate the coding of the mathematicalexpression.

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δ t δ n

Unit step

The unit step should be presented as u t in continuous-time and as u n in discrete-time. These functions will be marked-up in MathML the same as the delta function above; however,rather than the δ symbol you will use u .

The unit step is a signal which could be given a definitionURL, which in conjunction with csymbol would allow us to facilitate the coding of the mathematical expression.

Sinc

The sinc function should be represented as

sinc x x x
The sinc function is a signal which could be given a definitionURL, which in conjunction with csymbol would allow us to facilitate the coding of the mathematical expression.This has not happened yet so, for now, we are using the following markup:

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sinc x

Norm

The norm of a vector or function should be represented as x For instance, the Euclidean norm (sometimes called the L2-norm) of a vector should be given by

x i 1 N x i 2
The norm operator has been given a csymbol but are still working on the rendering of it. Thecorrect code can be seen below and was used to mark-up the first instance of the norm of x in the above paragraph.

Mathml mark-up

x

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Source:  OpenStax, Ece 454 and ece 554 supplemental reading. OpenStax CNX. Apr 02, 2012 Download for free at http://cnx.org/content/col11416/1.1
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