# Basics of Noise and its Measurements

- Institution: IIT Kanpur
- Department: Mechanical Engineering
- Teacher: Prof. Nachiketa Tiwari
- Level: Undergraduate
- Language: English
- Subjects: Engineering
- Source: [NPTEL](https://nptel.ac.in/courses/112104194)
- Licence: [CC BY-NC-SA](https://nptel.ac.in/faq) (Non-commercial use only.)
- Syllabus: [at the source](https://nptel.ac.in/courses/112104194)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

## Lectures

1. [Introduction](https://invisiblenetwork.ai/learn/nptel/112104194/aa5f50b665e6) (Video)
2. [Vibration versus Waves](https://invisiblenetwork.ai/learn/nptel/112104194/5594b2ffd139) (Video)
3. [Nature of Sound](https://invisiblenetwork.ai/learn/nptel/112104194/47a21b1a9f2f) (Video)
4. [The Decibel Scale](https://invisiblenetwork.ai/learn/nptel/112104194/b13593f9b248) (Video)
5. [Some Key Terms](https://invisiblenetwork.ai/learn/nptel/112104194/143492e5f192) (Video)
6. [Adding Decibels](https://invisiblenetwork.ai/learn/nptel/112104194/48c0f30ae258) (Video)
7. [Modeling Sound Propagation](https://invisiblenetwork.ai/learn/nptel/112104194/957a290d74eb) (Video)
8. [The Momentum Equation](https://invisiblenetwork.ai/learn/nptel/112104194/5db05b47d878) (Video)
9. [The Continuity Equation & The Gas Law](https://invisiblenetwork.ai/learn/nptel/112104194/e788145d2a90) (Video)
10. [1-D Wave Equation](https://invisiblenetwork.ai/learn/nptel/112104194/ba698b360e9e) (Video)
11. [General Solution for 1-D Wave Equation](https://invisiblenetwork.ai/learn/nptel/112104194/167a38679fad) (Video)
12. [Complex Time Signal & Transfer Functions](https://invisiblenetwork.ai/learn/nptel/112104194/542ad3eacd03) (Video)
13. [Transmission line equations](https://invisiblenetwork.ai/learn/nptel/112104194/cc677ca41084) (Video)
14. [Planar Waves in Closed Tubes](https://invisiblenetwork.ai/learn/nptel/112104194/c1256f9ad78f) (Video)
15. [Planar Waves in 1-D Open Tubes](https://invisiblenetwork.ai/learn/nptel/112104194/235d6e7dcef9) (Video)
16. [A Semi-Infinite Tube and Overall Summary](https://invisiblenetwork.ai/learn/nptel/112104194/0dbb3e96d425) (Video)
17. [1-D Tubes with Imperfect Terminations](https://invisiblenetwork.ai/learn/nptel/112104194/b8f72426a4b6) (Video)
18. [Measuring Impedance Through Kundt’s Apparatus](https://invisiblenetwork.ai/learn/nptel/112104194/d68f3fc29a42) (Video)
19. [Classification of Microphones](https://invisiblenetwork.ai/learn/nptel/112104194/e47c38f8d0c1) (Video)
20. [Classification of Microphones- Continuation](https://invisiblenetwork.ai/learn/nptel/112104194/a3cbbd0ed758) (Video)
21. [Classification of Microphones by Application](https://invisiblenetwork.ai/learn/nptel/112104194/62cfb774a0b1) (Video)
22. [Microphone Sensitivity](https://invisiblenetwork.ai/learn/nptel/112104194/f2df4caf1102) (Video)
23. [Microphone Sensitivity- Continuation](https://invisiblenetwork.ai/learn/nptel/112104194/7ce9fe3b877b) (Video)
24. [Selecting the Right Microphone](https://invisiblenetwork.ai/learn/nptel/112104194/50b1c58ea7e0) (Video)
25. [Fourier Series Expansion](https://invisiblenetwork.ai/learn/nptel/112104194/7748613858b4) (Video)
26. [Fourier Series Expansion - Continuation](https://invisiblenetwork.ai/learn/nptel/112104194/8221a7b5a38d) (Video)
27. [Fourier Integral](https://invisiblenetwork.ai/learn/nptel/112104194/7b48bf8e42d0) (Video)
28. [Fourier Integral - Continuation](https://invisiblenetwork.ai/learn/nptel/112104194/e4e66a6a5062) (Video)
29. [Fourier Transform](https://invisiblenetwork.ai/learn/nptel/112104194/ad67f0d38a29) (Video)
30. [Fourier Transform - Continuation](https://invisiblenetwork.ai/learn/nptel/112104194/300f596fa755) (Video)
31. [Discrete Fourier Transform (DFT)](https://invisiblenetwork.ai/learn/nptel/112104194/26ef46188958) (Video)
32. [Discrete Fourier Transform (DFT)- Continuation](https://invisiblenetwork.ai/learn/nptel/112104194/85de86d181cd) (Video)
33. [DFT: Calculating Frequencies and Padding](https://invisiblenetwork.ai/learn/nptel/112104194/4ef27f0af503) (Video)
34. [DFT: Influence of Duration and Sampling frequency on resolution](https://invisiblenetwork.ai/learn/nptel/112104194/27cf6831cca4) (Video)
35. [FFT and Inverse FFT](https://invisiblenetwork.ai/learn/nptel/112104194/56407ee2783c) (Video)
36. [Considerations while deciding instrumentation](https://invisiblenetwork.ai/learn/nptel/112104194/c43684e9d639) (Video)
37. [Considerations while selecting instruments for noise measurements](https://invisiblenetwork.ai/learn/nptel/112104194/c67ae26b6d37) (Video)
38. [Measuring impedance through two microphone method](https://invisiblenetwork.ai/learn/nptel/112104194/b78dfd2428b6) (Video)
39. [Designing an impedance measurement tube](https://invisiblenetwork.ai/learn/nptel/112104194/afd544bf8062) (Video)
40. [Octave band analysis](https://invisiblenetwork.ai/learn/nptel/112104194/4c074fc8dbdd) (Video)
41. [Calculating results in octave bands](https://invisiblenetwork.ai/learn/nptel/112104194/0db675fa96aa) (Video)
42. [Weighting](https://invisiblenetwork.ai/learn/nptel/112104194/3ffb571b4df4) (Video)
43. [Short time Fourier transforms (STFT)](https://invisiblenetwork.ai/learn/nptel/112104194/d38eaaa12ce1) (Video)
44. [Spectrograms](https://invisiblenetwork.ai/learn/nptel/112104194/b7f178099d66) (Video)
45. [Reverberation time](https://invisiblenetwork.ai/learn/nptel/112104194/40b5345e68cc) (Video)
46. [Anechoic rooms](https://invisiblenetwork.ai/learn/nptel/112104194/177cb93b73b3) (Video)
47. [STC, NRC and sound attenuation](https://invisiblenetwork.ai/learn/nptel/112104194/45103aef85d3) (Video)
48. [Reverberant rooms](https://invisiblenetwork.ai/learn/nptel/112104194/ae845694acc1) (Video)