ECE107_Chapter1.pdf - ECE107 SY2018-2019 ECE107 ENGR...

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ECE107 SY2018-2019 LDValiente 11/15/2018 1 ECE107 ENGR. LEONARDO VALIENTE JR. 1 Signal A signal can be defined as - Any physical quantity that varies with time, space or any other independent variable or variables. - A pattern of variations of a physical quantity that can be manipulated, stored, or transmitted by physical process. - An information variable represented by physical quantity. For digital systems, the variable takes on discrete values. 2 LDVALIENTE
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ECE107 SY2018-2019 LDValiente 11/15/2018 2 System A system may also be defined as a physical device that performs an operation on a signal. For example, a filter used to reduce the noise and interference corrupting a desired information-bearing signal is called a system. 3 LDVALIENTE (Digital) Signal Processing Signal Processing deals with the enhancement, extraction, and representation of information for communication or analysis Many different fields of engineering rely upon signal processing technology Examples: Acoustics, telephony, radio, television, seismology, and radar Digital Signal Processing is a field of numerical mathematics that is concerned with the processing of discrete signals This area of mathematics deals with the principles that underlie all digital systems LDVALIENTE 4
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ECE107 SY2018-2019 LDValiente 11/15/2018 3 Basic Elements of a Digital Signal Processing System Block diagram of a digital signal processing system. Analog Input Signal A/D Converter D/A Converter Digital signal processor Analog Input Signal Digital input signal Digital output signal 5 LDVALIENTE 6 LDVALIENTE
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ECE107 SY2018-2019 LDValiente 11/15/2018 4 Practical, Inexpensive DSP System Stereo Amplifier Record Player Tape Deck Radio Sound Card A/D Right Channel Left Channel D S P Sound Card D/A “Cool Edit” Waveform Editor Computer Analog/ Continuous- Time Signals Digital/ Discrete- Time Signals Multichannel (Stereo) Signals D igital S ignal P rocessing: 1) Noise Reduction -Digital Filtering, etc. 2) Signal Compression -MP3, JPEG/MPEG Image, etc. 3) Spectral Analysis (e.g., FFT) LDVALIENTE Electronic “Fax” via P ortable D ocument F ormat You’ve Got Mail: Adobe Acrobat PDF Far more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often Encountered Far more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often Encountered 700 KB Far more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often Encountered 700 KB Far more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often EncounteredFar more Complex Acoustic Waveforms are often Encountered 700 KB
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