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1、Chapter1 Signals and Signal Processing 1.Characterization and Classification of Signals2.Typical Signal Processing Operations3.Examples of Typical Signals11.What is a Signal?A signal is a function of independent variables such as time, distance, position, temperature, and pressure. It is the carrier
2、 of information.Eg: speech signal, image signal, video signal2Classification of signal:(1)One-dimensional(1-D),Two-dimensional(2-D) and Vector signal(M-D) (2)Periodic and Non-periodic Signal(3) Deterministic and Random signal (4) Energy and Power signal3 (5) Continuous-time, Discrete-time and Digita
3、l signal Analog Signal & Digital Signal :Analog signal: A continuous-time signal with a continuous amplitude. Digital signal: A discrete-time signal with discrete-valued amplitudes represented by a finite number of digits .42. What is signal processing? The objective of signal processing is to extra
4、ct useful information carried by the signal.It is concerned with the mathematical representation of the signal and the algorithmic operation.For processing these signals, we usually transform them into transform-domain. 5Typical Signal Processing Operations: (1)Elementary Time-Domain Operations (2)F
5、iltering (3)Generation of Complex Signals (4)Modulation and Demodulation (5)Multiplexing and Demultiplexing (6)Quadrature Amplitude Modulation (7)Signal Generation 63.Examples of Typical SignalsECG signal.EEG signal.Seismic signals.Speech signals.Musical sound signal.Time series.Images.74. Typical S
6、ignal Processing ApplicationsSound recording applications.Compressors and limiters.Expanders and noise gates.Equalizers and filters.Noise reduction system.Delay and reverberation systems.Telephone Dialing ApplicationsFM Stereo Applications85 Some NotationsSignal representations.Convolution.Angular frequency.Step signal.Circular shift.Circular conjugate symmetric and antisymmetric.9
