Applied Acoustics Course - A.Y. 2020/2021

FLIPPED CLASSROOM

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

 

 

Link to the MS-Teams for online interactive activity

Use the following code for accessing the team without the need of asking permission to the teacher: nhhw618

 

N.

Date

Time

Topic

Presentations

Recordings

Notes

0

21/09/2020

09:00-10:00

Course introduction, program, web page, methods

HTML

AVI

 

1

22/09/2020

08:00-09:00

Nature of sound, fundamental physical quantities

PPT

AVI

DOC

2

22/09/2020

09:00-10:00

Energy & Sound, scale of decibels

PPT

AVI

DOC

3

28/09/2020

08:00-09:00

Human auditory system, loudness evaluation, weighting curves

PPT AVI DOC

4

28/09/2020

09:00-10:00

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

PPT AVI

5

29/09/2020

08:00-09:00

Sum and subtraction of values in dB, examples of dB summation, exercises with dBs

PPT AVI

DOC

6

29/09/2020

09:00-10:00

Spectral Analysis, FFT, octave bands, Bark bands

PPT AVI DOC

7

05/10/2020

08:00-09:00

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

PPT AVI DOC

8

05/10/2020

09:00-10:00

Linear sources, cylindrical divergence, excess attenuation, Noise screens, Maekawa formulas, examples

PPT AVI DOC

T-1

06/10/2020

09:00-10:00

First Intermediate Test (assignment) - RESULTS

     

9

12/10/2020

08:00-09:00

Indoor sound propagation, semi-reverberant field, critical distance

PPT AVI DOC

10

12/10/2020

09:00-10:00

Reverberation time, definition and Sabine's formula

PPT AVI DOC

11

13/10/2020

08:00-09:00

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

PPT AVI DOC

12

13/10/2020

09:00-10:00

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

PPT AVI DOC

13

19/10/2020

08:00-09:00

Measurement of impulse response: impulsive sources, microphones

PPT AVI DOC

14

19/10/2020

09:00-10:00

Measurement of impulse response: loudspeakers, MLS and ESS methods

PPT AVI DOC

T-2

20/10/2020

09:00-10:00

Second Intermediate Test (assignment) - RESULTS

     

15

26/10/2020

08:00-09:00

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

PPT AVI DOC

16

26/10/2020

09:00-10:00

Speech Transmission Index: measurement and calculation

PPT AVI DOC

17

27/10/2020

08:00-09:00

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

PPT

AVI DOC

18

27/10/2020

09:00-10:00

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

PPT AVI DOC

19

02/11/2020

08:00-09:00

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

PPT AVI DOC

20

02/11/2020

09:00-10:00

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

PPT AVI DOC

T-3

03/11/2020

09:00-10:00

Third Intermediate Test (assignment) - RESULTS

     

21

09/11/2020

08:00-09:00

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

PPT AVI DOC

22

23

09/11/2020

09:00-10:00

Examples and exercises regarding environmental noise

AVI  

Examples and exercises regarding noise at the workplace

AVI

24

10/11/2020

08:00-09:00

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

PPT AVI DOC

25

10/11/2020

09:00-10:00

Computation of FIR coefficients for inverse filters, the Kirkeby inversion, Auralization by convolution

PPT AVI DOC

26

16/11/2020

08:00-10:00

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

PPT AVI DOC

T-4

17/11/2020

09:00-10:00

Fourth Intermediate Test (assignment) - RESULTS

     

27

23/11/2020

08:00-09:00

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

PPT AVI DOC

28

23/11/2020

09:00-10:00

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

PPT AVI DOC

29

24/11/2020

08:00-09:00

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

PPT AVI DOC

30

24/11/2020

09:00-10:00

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

AVI DOC

E-1

30/11/2020

09:00-10:00

Experimental Measurements #1
(Sound Level Meter, Calibrator, Spectrum Analyzer, Sound Intensity)

     

E-2

01/12/2020

09:00-10:00

Experimental Measurements #2
(Room Impulse Response, Acoustical Parameters, STI)

     

E-3

14/12/2020

09:00-10:00

Experimental Measurements #3
(Microphone Arrays, Acoustic Camera, Colour Mapping)

     

T-5

15/12/2020

09:00-10:00

Fifth Intermediate Test (assignment)

     

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Last revision: 25 October 2020