VE451Su2010C1 - Text book: Proakis

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VE451 Lecture Notes Dianguang Ma Summer 2010
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Chapter 1 Introduction
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What Is a Signal? A signal is defined as any physical quantity that varies with time, space, or any other independent variable or variables. Mathematically, we describe a signal as a function of one or more independent variables.
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What Is a System? A system may be defined as a signal processor.
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What Is Signal Processing? When we pass a signal through a system, we say that we have processed the signal. The operation or operations performed by the system are usually referred to as signal processing.
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Analog Signal Processing Most of the signals encountered in science and engineering are analog in nature. That is, the signals are functions of a continuous variable and usually take on values in a continuous range. Such signals may be processed directly by appropriate analog systems. In such a case, we say that the signal has been processed directly in its analog form.
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Analog signal processor Analog input signal Analog output signal
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Digital Signal Processing Digital signal processing provides an alternative method for processing the analog signal.
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Typical Digital Signal Processing System Digital processing of analog signals proceeds in three stages: The analog signal is digitized. This process is called A/D conversion. The digitized samples are processed by a digital signal processor. The resulting output samples may be converted back into analog form. This process is called D/A conversion.
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Digital Signal Processor The digital signal processor may be a hardwired digital processor configured to
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VE451Su2010C1 - Text book: Proakis

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