Digital Signals

• Digital signals arise when a discrete-time signal is quantized.
• A quantized signal assumes only discrete amplitude values.
• Quantized, discrete-time signals can be encoded into a sequence of bits.
• A sequence of bits can be processed by digital hardware, such as a computer.
• There are numerous, powerful processing techniques for digital signals that have no counterpart for analog signals.
• Additionally, digital hardware is much easier to produce than analog equipment.

  

Figure 2.9: Digital signals are discrete time signals that assume only discrete amplitudes