CHAPTER 1 SIGNALS AND SYSTEMS. Signal Signals are functions of independent variables that carry information. For example:  Electrical signals ---voltages.

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Presentation transcript:

CHAPTER 1 SIGNALS AND SYSTEMS

Signal Signals are functions of independent variables that carry information. For example:  Electrical signals ---voltages and currents in a circuitAcoustic signals ---audio or speech signals (analog or digital)  Video signals ---intensity variations in an image (e.g. a CAT scan)  Biological signals ---sequence of bases in a gene

THE INDEPENDENT VARIABLES  Can be continuous  Trajectory of a space shuttle  Mass density in a cross-section of a brainCan be discrete  DNA base sequence  Digital image pixels  Can be 1-D, 2-D, N-DFor this course: Focus on a single (1-D) independent variable which we call“time”. Continuous-Time (CT) signals: x(t), t—continuous valuesDiscrete-Time (DT) signals: x[n], n—integer values only

CT Signals  Most of the signals in the physical world are CT signals—E.g. voltage & current, pressure, temperature, velocity, etc.

DT Signals  x[n], n—integer, time varies discretely  Examples of DT signals in nature:—DNA base sequence—Population of the nth generation of certain species

Many human-made DT Signals  Ex.#1Weekly Dow- Jonesindustrial average  Ex.#2digital image Why DT? —Can be processed by modern digital computers and digitalsignal processors (DSPs). Courtesy of Jason Oppenheim. Used with permission.

SYSTEMS For the most part, our view of systems will be from an input-output perspective: A system responds to applied input signals, and its response is described in terms of one or more output signals CT system x(t)x(t)y(t)y(t) DT system x[n]x[n]y[n]y[n]

EXAMPLES OF SYSTEMS  An RLC circuit  Dynamics of an aircraft or space vehicle  An algorithm for analyzing financial and economic factors to predict bond prices  An algorithm for post-flight analysis of a space launch  An edge detection algorithm for medical images y(t)y(t) x(t)x(t)

SYSTEM INTERCONNECTIOINS  An important concept is that of interconnecting systems  To build more complex systems by interconnecting simpler subsystems  To modify response of a system

 Signal flow (Block) diagram Classcade Parallel Feedback