NPTEL : NOC:Fundamentals of Acoustics (Mechanical Engineering)

Co-ordinators : Prof. Nachiketa Tiwari


Lecture 1 - Lesson 1 - Course Overview

Lecture 2 - Lesson 2 - Introduction

Lecture 3 - Lesson 3 - Nature Of Sound

Lecture 4 - Lesson 4 - The Decibel scale

Lecture 5 - Lesson 5 - Key Terms In Acoustics

Lecture 6 - Lesson 6 - Adding Decibels

Lecture 7 - Lesson 1 - Important Mathematical Concepts-Complex Algebra

Lecture 8 - Lesson 2 - Important Mathematical Concepts-Complex Time Signals

Lecture 9 - Lesson 3 - Important Mathematical Concepts-Transfer Function

Lecture 10 - Lesson 4 - Important Mathematical Concepts-Pole Zero Plot

Lecture 11 - Lesson 5 - Important Mathematical Concepts - Bode Plot For Simple Pole

Lecture 12 - Lesson 6 - Important Mathematical Concepts - Bode Plot For Simple Zero

Lecture 13 - Lesson 1 - Bode Plots (Magnitude) for Complex Transfer Functions

Lecture 14 - Lesson 2 - Momentum Equation for 1-D Sound Propagation

Lecture 15 - Lesson 3 - Continuity Equation for 1-D Sound Propagation

Lecture 16 - Lesson 4 - Gas Law for 1-D Sound Propagation

Lecture 17 - Lesson 5 - 1-D Wave Equation

Lecture 18 - Lesson 6 - Solution for 1-D Wave Equation

Lecture 19 - Lesson 1 - Waveguide

Lecture 20 - Lesson 2 - Transmission Line Equations - Part I

Lecture 21 - Lesson 3 - Transmission Line Equations - Part II

Lecture 22 - Lesson 4 - Transmission Line Equations - Part III

Lecture 23 - Lesson 5 - Transmission Line Equations - Part IV

Lecture 24 - Lesson 6 - Transmission Line Equations - Part V

Lecture 25 - Lesson 1 - Instantaneous Power

Lecture 26 - Lesson 2 - Instantaneous Power in a L-R Circuit

Lecture 27 - Lesson 3 - Power Factor, and Acoustic Power

Lecture 28 - Lesson 4 - Power Flow into an Infinitely Long Tube

Lecture 29 - Lesson 5 - Point Sources of Sound

Lecture 30 - Lesson 6 - Relations for Outward Travelling Spherical Acoustic Wave

Lecture 31 - Lesson 1 - Specific Acoustic Impedance for a Closed Tube

Lecture 32 - Lesson 2 - Specific Acoustic Impedance for an Open Tube and an Infinitely Long Tube

Lecture 33 - Lesson 3 - Specific Acoustic Impedance for a Tube with Imperfect Termination

Lecture 34 - Lesson 4 - Kundt’s Tube

Lecture 35 - Lesson 5 - Volume Velocity

Lecture 36 - Lesson 6 - Comparison of Impedances for a Radially Propagating Wave and a Planar Wave

Lecture 37 - Lesson 1 - Interference of sound sources - Part I

Lecture 38 - Lesson 2 - Interference of sound sources - Part II

Lecture 39 - Lesson 3 - Interference of sound sources - Part III

Lecture 40 - Lesson 4 - Interference of sound sources - Part IV

Lecture 41 - Lesson 5 - Directivity

Lecture 42 - Lesson 6 - Complex power, pressure and velocity for a spherical source

Lecture 43 - Lesson 1 - Noise reduction - Mass Attenuation Method

Lecture 44 - Lesson 2 - Noise Reduction - Pressure Ratio

Lecture 45 - Lesson 3 - Noise Reduction - Velocity of Wall

Lecture 46 - Lesson 4 - 3 Media Problem - Introduction

Lecture 47 - Lesson 5 - 3 Media Problem - Apply Boundary Conditions

Lecture 48 - Lesson 6 - 3 Media Problem - Special cases

Lecture 49 - Lesson 1 - Mufflers

Lecture 50 - Lesson 2 - Designing of Reactive Mufflers

Lecture 51 - Lesson 3 - Designing of Dissipative Mufflers

Lecture 52 - Lesson 4 - Time and Frequency Domain Representation of a Signal

Lecture 53 - Lesson 5 - Fourier Series

Lecture 54 - Lesson 6 - Fourier Series

Lecture 55 - Lesson 1 - Fourier Transform

Lecture 56 - Lesson 2 - Fourier Transform

Lecture 57 - Lesson 3 - Fourier Transform

Lecture 58 - Lesson 4 - Discrete Fourier Transform (DFT)

Lecture 59 - Lesson 5 - Discrete Fourier Transform (DFT)

Lecture 60 - Lesson 6 - Discrete Fourier Transform (DFT)

Lecture 61 - Lesson 1 - Measuring Sound Signals

Lecture 62 - Lesson 2 - Microphones

Lecture 63 - Lesson 3 - Microphones

Lecture 64 - Lesson 4 - Weighting

Lecture 65 - Lesson 5 - Loudness

Lecture 66 - Lesson 6 - Loudness

Lecture 67 - Lesson 1 - Octave Band Analysis - Part I

Lecture 68 - Lesson 2 - Octave Band Analysis – Part II

Lecture 69 - Lesson 3 - Octave Band Analysis – Part III

Lecture 70 - Lesson 4 - Reverberation Time

Lecture 71 - Lesson 5 - Calculation of Reverberation Time and Sound Transmission Class (STC)

Lecture 72 - Lesson 6 - Noise Reduction Coefficient (NRC)