Applied Acoustics Course - A.Y. 2019/2020

Calendar with link to PPT presentations, AVI audio-video recordings, notes and in-class tests

N.

Date

Time

Topic

Presentation

Recording

Note

0

20/09/2019

13.45-14.40

Course introduction

HTML

AVI

 

1

14.50-15.35

Nature of sound, fundamental physical quantities

PPT

AVI

DOC

2

15.45-16.40

Energy & Sound, scale of decibels

PPT

AVI

DOC

 

27/09/2019

 

Notte dei Ricercatori, NO LESSON !!!
come visiting our boot in Scientific Engineering building #10,
and enjoy Acoustics Virtual reality applications

     

3

04/10/2019

13.45-14.40

Human auditory system, loudness evaluation, weighting curves

PPT

AVI

DOC

4

14.50-15.35

The Sound Level Meter, equivalent level, calibration, time history with different time constants (slow, fast, etc.)

PPT

AVI

5

15.45-16.40

Sum and subtraction of values in dB,  examples of dB summation, Spectral Analysis, FFT, octave bands, Bark bands

PPT

AVI

DOC

6

11/10/2019

13.45-14.40

Free Field sound propagation, point sources, spherical divergence, directivity

PPT

AVI

DOC

7

14.50-15.35

Linear sources, cylindrical divergence, excess attenuation

PPT

AVI

DOC

8

15.45-16.40

Noise screens, Maekawa formulas, examples

PPT

AVI

DOC

9

18/10/2019

13.45-14.40

Indoor sound propagation, semi-reverberant field, critical distance

PPT

AVI

DOC

10

14.50-15.35

Reverberation time, definition and Sabine's formula

PPT

AVI

DOC

11

15.45-16.40

Environmental correction factor K2, sound propagation inside not-Sabinian rooms.

PPT

AVI

DOC

12

16:40-17:30

Digital sampling of sound, digital filters, FFT, convolution in time and frequency domain

PPT

AVI

DOC

13

25/10/2019

13.45-14.35

Measurement of impulse response: impulsive sources, microphones

PPT

AVI

DOC

14

14.45-15.30

Measurement of impulse response: loudspeakers, MLS and ESS methods

PPT

AVI

DOC

 

15.40-16.30

 Practical experiments of IR measurements (*)

 

 

 

 

16:30-17:30

 First in-class test

 

 

 

15

08/11/2019

13.45-14.40

ISO3382 standard, acoustical parameters: T20, T30, EDT, Clarity, Definition, Center Time, IACC, Jlf, G

PPT

AVI

DOC

16

14.50-15.35

Speech Transmission Index: measurement and calculation 

PPT

AVI

DOC

17

15.45-16.40

Sound absorbing materials, typical products. Example of measurement of Alpha Sabine according to ISO 354 (reverberant room)

PPT

AVI

DOC

18

15/11/2019

13.45-14.40

Sound insulating materials, typical products. Frequency dependence of the Sound Reduction Index R, the Mass law, resonances and coincidence.

PPT

AVI

DOC

19

14.50-15.35

Italian law about building acoustics (DPCM 5/12/1997), experimental assessment of compliance

PPT

AVI

DOC

20

15.45-16.40

Italian law about environmental noise (L. 447/1995), acoustical zoning, the new EC standards based on Lden - Results

PPT

AVI

DOC

 

16:40-17:30

 Second in-class test

 

 

 

21

22/11/2019

13.45-14.40

The Single Event Level (SEL) and its usage for evaluation of transportation noise

PPT

AVI

DOC

22

14.50-15.35

Examples and exercises regarding environmental noise


AVI


23

15.45-16.40

Examples and exercises regarding noise at the workplace

AVI  

24

29/12/2019

13.45-14.40

Digital Sound Processing, FIR and IIR filters, FFT, aliasing, windows, spectrogram

PPT
AVI
DOC

25

14.50-15.35

Fast convolution by FFT, partitioned convolution, computation of FIR coefficients for inverse filters, the Kirkeby inversion

PPT
AVI
DOC

26

15.45-16.40

Measurement of the absorption coefficient: reverberant room, standing wave tube, sound intensity method, impulsive method 

PPT

AVI

DOC

 

16.40-17.30

 Third in-class test

 

 

 

27

06/12/2019

13.45-14.40

Techniques employed for sound recording and reproduction, mono, stereo, multichannel, 3D, the Soundfield microphone, Ambisonics

PPT
AVI
DOC

28

14.50-15.35

Wave Field Synthesis (WFS), loudspeaker arrays, the Casa del Suono lab in Parma

PPT
AVI
DOC

29

15.45-16.40

Microphone arrays, virtual microphones, the RAI project

PPT AVI DOC

30

13/12/2019

15.45-16.40

Simulation of sound propagation  outdoors employing the DISIA/CITYMAP software package

PPT
AVI
DOC

31

13.45-14.40

Simulation of sound propagation indoors employing the RAMSETE/AURORA software package


AVI
DOC

32

14.50-16.40

Final exercises, previous exam problems

HTML

   

 

16:40-17:30

 Fourth in-class test

 

 

 

(*) Warning: this activity involves very loud sound signals, so it is recommended to carry protective devices (earplugs, etc.) - it is also recommended to bring a recording device (laptop, smartphone, tablet) equipped with software capable of recording uncompressed WAV files.

Copyright (C) Angelo Farina – all the material posted here cannot be reproduced or broadcasted without authorization.
Last revision: 19 September 2019