(1.2) Frequency Spectrum of Signals
(1.3) Analog and Digital Signals
(1.5) Circuit Models for Amplifiers
(1.6) Frequency Response of Amplifiers
(1.1) Signals : contain information about a variety of things and activities in our physical world
ex) temperature, pressure, speed, sound, light ...
⊙ Transducers : signal must first be converted into an electrical signal for signal processing by electronic systems
ex) microphone, photo-transistor, thermister ...
⊙ Electric signal source