Analog Signal Processing
An analog signal varies continuously over time. It could vary in amplitude, frequency, or phase. These components define the sound wave an analog signal represents. The amplitude, frequency, and phase shift are three characteristics of the analog signal that can be varied to convey information. Analog signals are inherently susceptible to attenuation as they progress along the transmission medium. Analog signals are also susceptible to electromagnetic interference (EMI), radio frequency interference (RFI), and other noise sources. This results in signal distortion with changes in frequency characteristics.
Analog telephony signals span the 200-Hz to 3.4-kHz frequency band. Such analog signals are referred to as narrowband ...
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