Signals and its Types

 Signals, Analog & Digital Signals

What is Signal ? 

       Signal is define as a physical quantity, which contains some information & which is a function of one or more independent variable.

Types of signals:  

1) Analog Signals

        Analog Signal is define as the signal having infinite number of continuous values. They are un-interrupted signals which provides information that varies with time. In other word one variable is Analogous (similar) to other that's why it is called as Analog Signals

• It is denoted by sin waves as shown in figure below
• Analog signal uses a continuous range of values that help you to represent information
• It uses a continuous range of values that help you to represent information.
• Signal bandwidth is low

 

 Examples of Analog Signal : We use analog signals in wide range of  various appliances & application such as 

• Temperature sensors
• FM radio signals
• Photocells
• Light sensor
• Resistive touch screen
• Sound System for sound amplification
• Audio Recording & Playback

2) Digital Signals

        Digital signals is define as the signal which has only a finite number of distinct values. Digital signals are time separated signals which are generated using digital modulation.

• Digital signals are time separated signals.
• It is denoted by square waves as shown in fig. below
• Digital Signal use discrete 0 & 1 to represent the information.
• Signal bandwidth is high.

 Examples of Digital Signal 

• Computers
•  CDs
• DVDs 

these are some examples of Digital signal.