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Questions and Answers
What is the aim of the first experiment?
To write a program in MATLAB to generate signals in discrete and continuous form.
The discrete form of a sine signal is represented as x(n) = A sin (___ + θ).
wn
The formula for an exponential signal is x(n) = exp(___).
n
A cosine signal can be generated using the keyword stem in MATLAB.
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Which MATLAB command is used to generate a discrete unit step signal?
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What does the xlabel command do in MATLAB?
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In the provided MATLAB code, what is the value of N used for generating signals?
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Study Notes
Generating Signals in Discrete and Continuous Forms
- The laboratory experiment instructs students to generate various signals in both discrete and continuous forms using MATLAB.
Signal Types
- A range of signal types are discussed, including unit impulse, unit step, sine, cosine, exponential, and ramp signals.
MATLAB Implementation
- The MATLAB code provided implements these different signals, generating both discrete and continuous representations of each.
Discrete vs Continuous Representations
- Discrete signals are visualized using the
stemfunction in MATLAB, which creates a step-like representation. - Continuous signals are represented using the
plotfunction, thus creating a smooth graph.
Sample Signals
- Unit impulse: A signal defined as 1 at n=0 and 0 at all other values of n.
- Unit step: A signal defined as 1 for n greater than or equal to 0 and 0 for n less than 0.
- Sine signal: A continuous waveform with its mathematical formula: x(n)= A sin (wn+θ).
- Cosine signal: Another continuous waveform defined by: x(n)= A cos (wn+θ).
- Exponential signal: A signal that follows the equation: x(n)= exp (n).
- Ramp signal: A signal that increases linearly, represented by: x(n) = n.
Graphical Displays
- Each generated signal is displayed with labelled axes and titles for clear visualization.
Key MATLAB Functions
-
stem: Generates a discrete representation of the signals. -
plot: Generates a continuous representation of the signals.
Sample Code Structure
- The code employs subplots (6 x 2) to display the discrete and continuous form of each signal side by side.
- The
Nvariable represents the length of the sequence. -
nis defined as a range of values from 0 to N-1, covering the domain of the signals. - The code uses
xlabel,ylabel, andtitleto label axes and provide descriptive titles for each subplot.
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Description
This quiz covers the generation of various signal types using MATLAB, including unit impulse, unit step, and sine signals. Students will learn to implement discrete and continuous forms of these signals through MATLAB code, visualizing them using both the stem and plot functions. Dive into signal processing concepts and MATLAB implementations.
