# 3: Analog Signal Processing

- Page ID
- 1612

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- 3.1: Voltage, Current, and Generic Circuit Elements
- We know that information can be represented by signals; now we need to understand how signals are physically realized. Over the years, electric signals have been found to be the easiest to use. Voltage and currents comprise the electric instantiations of signals. Thus, we need to delve into the world of electricity and electromagnetism.

- 3.14: Designing Transfer Functions
- The transfer function portrays how the circuit affects the amplitude and phase of each component, allowing us to understand how the circuit works on a complicated signal. Those components having a frequency less than the cutoff frequency pass through the circuit with little modification while those having higher frequencies are suppressed. The circuit is said to act as a filter, filtering the source signal based on the frequency of each component complex exponential.