NOC:Basics of Noise and Its Measurements


Lecture 1 - Introduction


Lecture 2 - Vibration versus Waves


Lecture 3 - Nature of Sound


Lecture 4 - The Decibel Scale


Lecture 5 - Some Key Terms


Lecture 6 - Adding Decibels


Lecture 7 - Modeling Sound Propagation


Lecture 8 - The Momentum Equation


Lecture 9 - The Continuity Equation and The Gas Law


Lecture 10 - 1-D Wave Equation


Lecture 11 - General Solution for 1-D Wave Equation


Lecture 12 - Complex Time Signal and Transfer Functions


Lecture 13 - Transmission line equations


Lecture 14 - Planar Waves in Closed Tubes


Lecture 15 - Planar Waves in 1-D Open Tubes


Lecture 16 - A Semi-Infinite Tube and Overall Summary


Lecture 17 - 1-D Tubes with Imperfect Terminations


Lecture 18 - Measuring Impedance Through Kundt’s Apparatus


Lecture 19 - Classification of Microphones


Lecture 20 - Classification of Microphones - Continuation


Lecture 21 - Classification of Microphones by Application


Lecture 22 - Microphone Sensitivity


Lecture 23 - Microphone Sensitivity- Continuation


Lecture 24 - Selecting the Right Microphone


Lecture 25 - Fourier Series Expansion


Lecture 26 - Fourier Series Expansion - Continuation


Lecture 27 - Fourier Integral


Lecture 28 - Fourier Integral - Continuation


Lecture 29 - Fourier Transform


Lecture 30 - Fourier Transform - Continuation


Lecture 31 - Discrete Fourier Transform (DFT)


Lecture 32 - Discrete Fourier Transform (DFT) - Continuation


Lecture 33 - DFT - Calculating Frequencies and Padding


Lecture 34 - DFT - Influence of Duration and Sampling frequency on resolution


Lecture 35 - FFT and Inverse FFT


Lecture 36 - Considerations while deciding instrumentation


Lecture 37 - Considerations while selecting instruments for noise measurements


Lecture 38 - Measuring impedance through two microphone method


Lecture 39 - Designing an impedance measurement tube


Lecture 40 - Octave band analysis


Lecture 41 - Calculating results in octave bands


Lecture 42 - Weighting


Lecture 43 - Short time Fourier transforms (STFT)


Lecture 44 - Spectrograms


Lecture 45 - Reverberation time


Lecture 46 - Anechoic rooms


Lecture 47 - STC, NRC and sound attenuation


Lecture 48 - Reverberant rooms