Applied Acoustics Course - A.Y. 2017/2018

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

N.

Date

Time

Topic

Presentation

Recording

Note

0

 

14.30-15.40

Course introduction, program, web page

HTML

AVI

 

1

15.50-16.50

Nature of sound, fundamental physical quantities

PPT

AVI

DOC

2

17.00-18.00

Energy & Sound, scale of decibels

PPT

AVI

DOC

3

 

14.30-15.40

Human auditory system, loudness evaluation, weighting curves

PPT

AVI

DOC

4

15.50-16.50

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

PPT

AVI

5

17.00-18.00

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

PPT

AVI

DOC

6

 

14.30-15.40

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

PPT

AVI

DOC

7

15.50-16.50

Linear sources, cylindrical divergence, excess attenuation

PPT

AVI

DOC

8

17.00-18.00

Noise screens, Maekawa formulas, examples

PPT

AVI

DOC

9

 

14.30-15.40

Indoor sound propagation, semi-reverberant field, critical distance

PPT

AVI

DOC

10

15.50-16.50

Reverberation time, definition and Sabine's formula

PPT

AVI

DOC

11

17.00-18.00

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

PPT

AVI

DOC

12

 

14.30-15.40

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

PPT

AVI

DOC

13

15.50-16.50

Measurement of impulse response: impulsive sources, microphones - Warning: this activity requires 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.

PPT

AVI

DOC

14

17.00-18.00

Measurement of impulse response: loudspeakers, MLS and ESS methods 

PPT

AVI

DOC

15

 

14.30-15.40

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

PPT

AVI

DOC

16

15.50-16.50

Speech Transmission Index: measurement and calculation 

PPT

AVI

DOC

17

17.00-18.00

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

PPT

AVI

DOC

18

 

14.30-15.40

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

PPT

AVI

DOC

19

15.50-16.50

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

PPT

AVI

DOC

20

17.00-18.00

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

PPT

AVI

DOC

21

 

14.30-15.40

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

PPT

AVI

DOC

22

15.50-16.50

Examples and exercises regarding environmental noise


AVI


23

17.00-18.00

Examples and exercises regarding noise at the workplace


AVI


24

 

14.30-15.40

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

PPT

AVI

DOC

25

15.50-16.50

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

PPT

AVI

DOC

26

17.00-18.00

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

PPT

AVI

DOC

30

 

14.30-15.40

The Hour of Code - writing small programs (plugins) for audio

HTML

 

31

15.50-16.50

The Hour of Code - using visual programming for audio processing

HTML

 

32

17.00-18.00

The Hour of Code - examples of coding

HTML


27

 

14.30-15.40

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

PPT

AVI

DOC

28

15.50-16.50

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

PPT

AVI

DOC

29

17.00-18.00

Microphone arrays, virtual microphones, the RAI project

PPT

AVI

DOC

33

 

14.30-15.40

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

PPT

AVI

DOC

34

15.50-16.50

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


AVI
DOC

35

17.00-18.00

Examples of written exams

HTML


 

The final results of the in-class tests of current year 2017/2018 will be available here at the end of the course (in January 2018)

Copyright (C) Angelo Farina – all the material posted here cannot be reproduced or broadcasted without authorization.
Last revision: 15 July 2017