Question
click below
click below
Question
Normal Size Small Size show me how
Acoustics Pt. 2
Speech Science Exam 1
Question | Answer |
---|---|
Sound level is expressed in terms of _______ | Intensity |
Amplitude of ______ is related to sound intensity | Vibration |
The _________ measures the relative intensity between two sounds | Decibel |
Decibel (dB) | Unit of intensity that is really a ratio; a tenth of a Bel |
Bel | A unit corresponding to an intensity ratio of 10 to 1 |
Decibels use ________ in order to map the wide value range of our perception | Logarithmic scale |
A doubling of intensity increases sound by approximately _________ | 3 dB |
dB does not correlate with? | What we perceive |
We cannot estimate sound intensity by? | What we hear |
3 dB increases is _______ noticeable | Barley |
10 dB increase will sound ______ as loud | 2x |
(Logarithmic basics) The log of any number can be expressed as? | An integral exponent of 10 (count the zeros) |
(Logarithmic basics) Numbers greater than 1 have _________, less than 1 will have __________ | Positive logs, negative logs |
Decibels are based on relative differences in intensity, they require a ______ | Reference value |
What are the two ways to measure sound intensity? | dB IL (intensity level) and dB SPL (sound pressure level) |
dB IL (intensity level) | Measures the output intensity |
What is the formula for dB IL? | dB IL=10 (log10 Wo/Wr) |
dB SPL (sound pressure level) | Measures sound pressure level at the ear drum |
What is the formula for dB SPL? | dB SPL=20 (log10 Po/Pr) |
Power is measured with the unit of _______ | Watt |
Power is ______ over time | Energy |