Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
Impedance
|
Objects often impede sound propogation.
Impedence "blocks" something. Sound cannot pass through something solid. Sound can be reflected back from a surface with greater impedance. |
|
|
Difraction
|
The property at which sound is scattered by small or medium objects.
|
|
|
Reverberation
|
Sound that is reflected multiple times, even after the sound has stopped.
Is of benefit to: acousticians musicians architects hearing scientists |
|
|
Constructive Interference
|
Occurs when two points of condensation meet. This also occurs when two points of rarefaction meet.
|
|
|
Destructive Interference
|
This type of interference occurs when a condensation point meets a rarefaction point.
The points of rarefaction and condensation cancel each other out. |
|
|
Pure Tone
|
Has the unique property that its wave shape and sound are changed only in amplitude and phase by linear acoustic systems.
Single frequency. Can be represented by a sine wave. |
|
|
Phase
|
Two or more tones that are identical at any point in time.
|
|
|
Complex Waves
|
Most of what we hear are complex sounds.
A combination of two or more sine waves. Complex waves are PHYSICAL attributes of sound (can be measured). Any complex wave can be treated as a combination of simple sine waves. |
|
|
Periodic Complex Wave
|
Pitch can be associated with a periodic complex wave.
Tonal quality. You need elasticity to maintain. |
|
|
Aperiodic Complex Wave
|
No tonal quality; transient sound.
Transient means a brief auditory signal. |
|
|
Fourier Analysis
|
A complex sound can be broken down into component parts.
One can plot the spectrum of a complex sound. Required when deriving the frequency domain spectra from the time domain. |
|
|
Spectrum
|
Allows us to break down a complex wave into two frequency components:
X axis is frequency Y axis is intensity |
|
|
Sound Analysis
|
Once sound pressure wave travels from a sound source, it encounters the outer ear.
Structures of the auditory system help to analyze sound wave. |
|
|
Resonance
|
This will transfer the energy to a different part of your ear. It can also store energy.
|
|
|
HL to SPL
|
Patient db HL added to Population threshold db SPL.
|
|
|
Formula for Sensation Level
|
Threshold level minus Patient Threshold
|
|
|
To find dB HL when SPL is known
|
Take the patient SPL and subtract the population SPL. The result will be in db HL.
|
