## Folding / Time Reversal

## Time Scaling: Compression and Expansion

## Time Shifting: Delay and Advance

## Why Time-Domain Operations Matter

## Quantization vs. Sampling: "Opposite" Operations

## Bits, Levels, and Step Size: The Fundamental Relationship

## Quantization Error: The Inevitable Distortion

## The Second Half of Digitization

## How to Avoid Aliasing

## From Sampling Frequency to Discrete Sequence