Hopefully, a person could start using the MATLAB LTI tool without any need to
read these help files. Features were designed to be intuitive and familiar to those
with basic computer experience.
If not send me mail by clicking on my name in the Overview section!!
For those who like to read the manual (don't be ashamed, I am one of these people),
this section will give you the minimum you need to get started and be comfortable with the
use of the GUI.
First, if you have not already done so, follow the information given in the
Installation section to install and start the MATLAB LTI
tool.
To begin, set the parameters for the input signal:
- Use the sliding bars to adjust the Amplitude, Frequency,
Phase, and DC Level of the signal as you desire. The display in the
INPUT SIGNAL and
OUTPUT SIGNAL plots will instantaneously update themselves to reflect each change
you make to the input signal.
- Choose a filter type by clicking the Filter Choice
pop-up menu at the bottom of the Filter Specifications
area. The plots titled Magnitude of the Filter and
Phase of the Filter will immediately update to display
the frequency response of the filter type you just chose. Depending on the type of
filter, extra sliding bars and/or data boxes may appear in the area immediately above:
- The Averaging Filter allows you to adjust its
length.
- The Ideal Low-Pass and
Ideal High-Pass filters allow you to specify their
cutoff frequencies and phase slopes. The non-ideal
Low-Pass and
High-Pass filters allow you to specify only their
cutoff frequencies.
-The Ideal Bandpass filter allows you to specify its
center frequency and phase slope. The non-ideal version only allows specification of its
center-frequency.
- User Input allows an arbitrary combination of
filter coefficients to be specified as the frequency response. Follow the format used
in the default example provided in the text field.
- After attempting to find the exact mathematical solution by hand (see
Theory section for help), press the
Theoretical Answer button at the bottom of the window to
reveal the equation form of the system output which will appear above the output signal plot.
That's it! You now understand the basics of how to use the MATLAB LTI tool.
For a more in depth description of LTI systems, frequency response and an example of
filtering, see the Theory section. The
Controls section provides a description of all the
elements in the user interface.