# InfoCoBuild

## Fundamentals of Acoustics

Fundamentals of Acoustics. Instructor: Prof. Nachiketa Tiwari, Department of Mechanical Engineering, IIT Kanpur. This course provides the basics of acoustics, and covers topics in the field: the nature of sound, sound terminology, overview of some important mathematical concepts like complex algebra and complex time signals, wave equation, sound propagation in a tube, acoustic power, spherical waves, interference of sound sources, noise reduction by mass attenuation, designing mufflers, Fourier series and (Fast) Fourier Transforms, microphones, weighting, loudness, octave band analysis, reverberation time, sound transmission class, and noise reduction coefficient. (from nptel.ac.in)

 Course Overview

 Introduction and Terminology Lecture 01 - Course Overview Lecture 02 - Introduction Lecture 03 - Nature of Sound Lecture 04 - The Decibel Scale Lecture 05 - Key Terms in Acoustics Lecture 06 - Adding Decibels Concept Review Lecture 07 - Important Mathematical Concepts - Complex Algebra Lecture 08 - Important Mathematical Concepts - Complex Time Signals Lecture 09 - Important Mathematical Concepts - Transfer Function Lecture 10 - Important Mathematical Concepts - Pole Zero Plot Lecture 11 - Important Mathematical Concepts - Bode Plot for Simple Pole Lecture 12 - Important Mathematical Concepts - Bode Plot for Simple Zero Wave Equation Lecture 13 - Bode Plots (Magnitude) for Complex Transfer Functions Lecture 14 - Momentum Equation for 1-D Sound Propagation Lecture 15 - Continuity Equation for 1-D Sound Propagation Lecture 16 - Gas Law for 1-D Sound Propagation Lecture 17 - 1-D Sound Wave Equation Lecture 18 - Solution for 1-D Sound Wave Equation Transmission Line Equations Lecture 19 - Waveguide Lecture 20 - Sound Propagation in a Semi-Infinite Tube Lecture 21 - Transmission Line Equations for Pressure and Velocity Lecture 22 - Sound Propagation in a Closed Tube Lecture 23 - Sound Propagation in Closed Tubes Lecture 24 - Sound Propagation in a Open Tube 1-D Waves Lecture 25 - Instantaneous Power Lecture 26 - Instantaneous Power in a L-R Circuit Lecture 27 - Power Factor, and Acoustic Power Lecture 28 - Power Flow into an Infinitely Long Tube Lecture 29 - Point Sources of Sound Lecture 30 - Relations for Outward Travelling Spherical Acoustic Wave Power and Spherical Waves Lecture 31 - Specific Acoustic Impedance for a Closed Tube Lecture 32 - Specific Acoustic Impedance for an Open Tube and an Infinitely Long Tube Lecture 33 - Specific Acoustic Impedance for a Tube with Imperfect Termination Lecture 34 - Kundt's Tube Lecture 35 - Volume Velocity Lecture 36 - Comparison of Impedances for a Radially Propagating Wave and a Planar Wave Spherical Waves and Interference Lecture 37 - Interference of Two Sound Sources Lecture 38 - Interference of Two Sound Sources with Zero Phase Difference Lecture 39 - Interference of Four Sound Sources with Zero Phase Difference Lecture 40 - Interference of n-Sound Sources with Zero Phase Difference Lecture 41 - Directivity Pattern, Directivity Factor, Directivity Index Lecture 42 - Complex Power, Pressure and Velocity for a Spherical Source Directivity and Mufflers Lecture 43 - Noise Reduction by Mass Attenuation Lecture 44 - Noise Reduction - Pressure Ratio Lecture 45 - Noise Reduction - Velocity of Wall Lecture 46 - 3 Media Problem - Introduction Lecture 47 - 3 Media Problem - Applying Boundary Conditions Lecture 48 - 3 Media Problem - Special Cases Sound in Rooms Lecture 49 - Mufflers Lecture 50 - Designing of Reactive Mufflers Lecture 51 - Designing of Dissipative Mufflers Lecture 52 - Time and Frequency Domain Representation of a Signal Lecture 53 - Fourier Series Lecture 54 - Fourier Series (cont.) Fourier Transform, DFT and FFT Lecture 55 - Fourier Transform Lecture 56 - Fourier Transform (cont.) Lecture 57 - Fourier Transform (cont.) Lecture 58 - Discrete Fourier Transform (DFT) Lecture 59 - Discrete Fourier Transform (cont.) Lecture 60 - Discrete Fourier Transform (cont.) Weighting and Loudness Lecture 61 - Measuring Sound Signals Lecture 62 - Microphones Lecture 63 - Classification of Microphones based on Application Lecture 64 - Weighting Lecture 65 - Loudness Lecture 66 - Loudness (cont.) Miscellaneous Topics and Closure Lecture 67 - Octave Band Analysis, Part I Lecture 68 - Octave Band Analysis, Part II Lecture 69 - Octave Band Analysis: Plotting Octave Band Plots Lecture 70 - Reverberation Time Lecture 71 - Calculation of Reverberation Time and Sound Transmission Class (STC) Lecture 72 - Noise Reduction Coefficient (NRC)

 References Fundamentals of Acoustics Instructor: Prof. Nachiketa Tiwari, Department of Mechanical Engineering, IIT Kanpur. This course provides the basics of acoustics.