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acoustic fundamentals

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This part of the lecture gives you a part 1 which involves being able to calculate sound decibels and inverse square law

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CityVarsity (CV)
Course
Audio Engineering










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Institution
CityVarsity (CV)
Course
Audio Engineering
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Uploaded on
October 6, 2021
Number of pages
19
Written in
2018/2019
Type
Class notes
Professor(s)
Siya
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All classes

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Part 1 – Acoustic Fundamentals

• Expressing sound in decibels
• Summing SPL
• Inverse square law
• System level

, Decibels are a scale for measuring a change in
power.
æ W1 ö
10 log ç ÷
è W0 ø
 So an increase from 1W to 100W is:
æ 100 ö
10 log ç ÷ = +20dB
è 1 ø
 If we double the power (a ratio of 2/1), we get an
increase of 3dB:
10 log ( 2) = +3dB

,  Every factor of 10 is equal to an increase of 10 dB


Power Level (re: 1 watt)
1000 w 30 dB
100 w 20 dB
10 w 10 dB
1w 0 dB
0,1 w -10 dB
0,01 w -20 dB
0,001 w -30 dB

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