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Time Domain LTI Systems

Impulse Response and LTI Systems - Part II

September 10, 2019 by

Linear time-invariant (LTI) systems are the most widely used systems in signal processing. In this lesson you will develop a deeper understanding for the role of the impulse response of LTI systems.  You will learn how linearity and time invariance result in the convolution sum for expressing the output of an LTI system in terms […]

Graphical Evaluation of Discrete-Time Convolution

September 5, 2019 by

Convolution expresses the output of a linear time-invariant system in terms of the system's impulse response and the input. In this lesson you will learn a graphical approach to evaluating convolution for continuous-time systems. Learning how to interpret convolution graphically will develop your intuition for understanding how the impulse response characteristics impact the system output. […]

Graphical Evaluation of Continuous-Time Convolution

September 1, 2019 by

Convolution expresses the output of a linear time-invariant system in terms of the system's impulse response and the input. In this lesson you will learn a graphical approach to evaluating convolution for continuous-time systems. Learning how to interpret convolution graphically will develop your intuition for understanding how the impulse response characteristics impact the system output. […]

Difference Equations: Solving System Responses with Stored Energy

August 25, 2019 by

Difference equations are one of the few descriptions for linear time-invariant (LTI) systems that can incorporate the effects of stored energy - that is, describe systems which are not at rest when the input is applied.  In this lesson you will learn how the output of a LTI system described by a difference equation can be expressed as […]

Characteristics of Systems Described by Difference Equations

August 20, 2019 by

Difference equations are often used to compute the output of a system from knowledge of the input.  They are an important and widely used tool for representing the input-output relationship of  linear time-invariant systems.   In this lesson you will learn how the characteristics of the system are related to the coefficients in the difference equation.  You will […]

Differential Equations: Solving System Responses with Stored Energy

August 15, 2019 by

Differential equation descriptions for continuous-time linear time-invariant systems are unique in that they allow analysis of the effect of stored energy on the system output.  You will learn how to represent the output of such a system as a sum of a steady-state and a transient component.  The steady-state component is of the same form as […]

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