MATLAB SIGNAL PROCESSING TOOLBOX 6 Bedienungsanleitung PDF herunterladen (Seite 10)

2 Basic Signal Processing Concepts

2-2

Representing Signals

In this section...

“Numeric Arrays” on page 2-2

“Vector Representation” on page 2-2

Numeric Arrays

The central data construct in the MATLAB environment is the numeric array, an ordered

collection of real or complex numeric data with two or more dimensions. The basic data

objects of signal processing (one-dimensional signals or sequences, multichannel signals,

and two-dimensional signals) are all naturally suited to array representation.

Vector Representation

MATLAB represents ordinary one-dimensional sampled data signals, or sequences, as

vectors. Vectors are 1-by-n or n-by-1 arrays, where n is the number of samples in the

sequence. One way to introduce a sequence is to enter it as a list of elements at the

command prompt. The statement

x = [4 3 7 -9 1];

creates a simple five-element real sequence in a row vector. Transposition turns the

sequence into a column vector

x = x';

x =

-9

Column orientation is preferable for single channel signals because it extends naturally

to the multichannel case. For multichannel data, each column of a matrix represents one

channel. Each row of such a matrix then corresponds to a sample point. A three-channel

signal that consists of x, 2x, and x/π is

y = [x 2*x x/pi]

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Bedienungsanleitung Seite 10