Chapter 13
Introduction to Signals and Systems
信号与系统
Signals are sets of data or information.
One-dimensional signals include single-variable functions, such as the variations in air pressure over time in ...
信号的分类
Signals are categorized as Continuous-time or discrete-time, Periodic or aperiodic, Analog or digital, and Causal or noncausal.
A continuous-time signal ...
能量和功率信号
Consider an electric system with a resistor. Here, the voltage and current signals enable power and energy measurement across the resistor.
For a ...
偶信号和奇信号
An even signal, either in continuous-time or discrete-time, is defined as a signal that matches its own time-reversed version.
Even signals are ...
基本的连续时间信号
Basic continuous-time signals include the unit step function, unit impulse function, and unit ramp function. These are collectively referred to as ...
矩形脉冲函数和三角形脉冲函数
The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This ...
指数信号和正弦信号
The exponential function serves as an essential tool for characterizing waveforms that rise and decay rapidly. This function is defined using the ...
基本离散时间信号
The unit step sequence is expressed as 1 for zero and positive values of integer 'n'. This can be graphically displayed using a set of eight ...
信号的基本操作
Basic signal operations are time reversal, scaling, shifting, and amplitude transformations.
Time reversal mirrors a continuous-time signal about the ...
系统分类-I
Linearity is a system property with a direct input-output relationship, combining homogeneity and additivity.
Homogeneity dictates that if an input is ...
系统分类-II
Continuous-time systems have continuous input and output signals, with time measured continuously, and are generally defined by differential or algebraic ...
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