Signals and Systems

Introduction to Signals and Systems

G R Sinha

Lecture Outline  Importance and Relevance of Signals and Systems  Learning Objectives

2 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Importance and Relevance of Signals and Systems

3 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Example 1: Multimedia

4 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Example 2: Transmission of Signal

5 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Signal and System?  Signal: Any entity or variable which carries some information, for example temperature, velocity, sound, image, light, video etc. 1. Electrical signals- Voltages and currents in a circuit 2. Acoustic signals-Acoustic pressure (sound) over time 3. Mechanical signals-Velocity of a car over time 4. Video signals-Intensity level of a pixel (camera, video) over time  System: Collection of components, working in coordination with each to achieve a desired goal, for example college, human body, computer, pen etc.

6 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

How are Signal and System related? • A system takes a signal as an input and transforms it into another signal Input signal

System

Output signal y(t)

x(t)

7 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Application Areas  Control: Mobile Robotics, Automation, Automatic Washing Machine  Communications: Transmission of Voice, speech, video; WhatsApp; Email etc.  Signal Processing: Speech and audio processing; Underwater signal processing, Remote sensing and satellite imaging

8 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Signal Processing Application of algorithms/methods to modify/process signals in a way to make them more useful.

9 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Biological Signal Processing  Aim:  Detect abnormal activity (cancer, heart attack etc.)  Help physicians with diagnosis  Methods: Filtering, Fourier Transform etc.  Brain signals (EEG)  Cardiac signals (ECG)  Medical images (X-ray, CT scan, MRI)

10 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Biometrics Identifying/recognizing a person using physiological characteristics  Fingerprint Identification  Face Recognition  Speech Recognition

11 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Learning Objectives     

To Learn basics of Signals and Systems; To Learn Properties of different types of systems and signals used in signal processing; To Understand mathematical background used in Filters and Filtering; To Get exposed to Design concepts of Filters and their Applications; To provide understanding of how different systems work and how signal is processed inside, both in communication and computation related applications; and  To cater problem solving and design skills.

12 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Learning Resource 1. Signals and Systems by Simon Haykin and Barry Van Veen, John Wiley and Sons, 2nd edition, 2003.

13 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha

Thanks with Happy Learning

E= mc2

14 Lecture 01: Introduction and Importance of Signals and Systems; Discussion on Learning Objectives

G R Sinha