Re: Shifting signal down

[Rick T]

Thanks

On Thu, Oct 27, 2011 at 11:15 AM, Ron Crummett <address@hidden> wrote:

First of all, to answer your questions:

-To shift the square signal downward just subtract 0.5 from the signal, like so:

squareShiftDown = square-0.5;

-For the triangle you'll need to scale as well as shift. Try:

triangleShiftDown = 2*triangle-1.5;

 

Secondly, Octave has functions you can use to create these signals which may or may not be easier than what you are currently doing. Read the help files for square, rectpuls, sawtooth, and tripuls if you are interested.

 

-Ron

On Thu, Oct 27, 2011 at 1:42 PM, Rick T <address@hidden> wrote:

Greetings all 

I have a signal that is created from 0 to 1 for the square,rectangle and the sawtooth signals on the y axis how can I shift the signal down (vertical offset) so the signal will go from -0.5 to 0.5 on the y axis, and change the triangle signal from 0.5 to 1.0 to -0.5 to 0.5?

clear all

% SCRIPT BEGINS

t=linspace(0,1,22050)

freq=5%how many times it repeats in 1 sec

A = 1; % amplitude

T = 1/freq; % period of the signal

% square

square = mod(t * A / T, A) > A / 2;

plot(t, square)

title('Square');

% rectangle

l = 0.2; % percentage the signal spends on low value

rectangle = mod(t * A / T, A) > A * l;

figure;

plot(t, rectangle);

title('Rectangle');

% sawtooth

sawtooth = mod(t * A / T, A);

figure;

plot(t, sawtooth);

title('Sawtooth');

% triangle

triangle = (mod(t * A / T, A) > 0.5).*mod(t * A / T, A) + (mod(t * A / T, A) <= 0.5).*(1 - mod(t * A / T, A));

figure;

plot(t, triangle);

title('triangle');

thanks

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