Analog Signals

• An analog signal is a signal with an amplitude that varies continuous for all time.
• In other words, a given time instant an analog signal can take on any value.
• Analog signal arise when a physical waveform is converted into an electrical signal.
• Example: The pressure wave from a sound is converted into an electrical signal by a microphone.
• A device that converts a physical waveform into an electrical signal is often called a transducer.

  

Figure 2.7: Analog signal from recording the word "MATLAB"