The Doppler Effect Delay Perception SPL Meters AUD202 Audio and Acoustics Theory.
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The Doppler Effect Delay Perception SPL Meters AUD202 Audio and Acoustics Theory
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Transcript of The Doppler Effect Delay Perception SPL Meters AUD202 Audio and Acoustics Theory.
The Doppler EffectDelay Perception
SPL Meters
AUD202Audio and Acoustics Theory
PsychoacousticsPerception of Direction
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Delay Perception
Short Delay up to 10ms: comb filtering effects from wave interaction
Medium Delay between 10-40ms: a ‘thickening’ effect
Long Delay, 40ms and above: a distinct repeat or echo of the sound.
Doppler Effect
A moving sound source creates a pitch change with respect to a stationary listener (or vice versa).
As the sound comes towards the listener, the pitch is higher. As the sound goes away, the pitch is lower.
Doppler Effect
A moving sound source creates a pitch change to a stationary listener.
As the sound comes towards the listener, the pitch is higher. As the sound goes away, the pitch is lower.
Doppler Effect
A moving sound source creates a pitch change with respect to a stationary listener (or vice versa).
Doppler Effect
The change of frequency due to motion
Doppler Shift
The wavelength of light emitted by a moving object is shifted. This effect is called the doppler shift.
Blue shifted = higher frequency = higher pitch.Red shifted = lower frequency = lower pitch.
Unity 3D Game Engine
Currently supports development for:
Windows, OS X, iOS, Xbox 360, PlayStation 3, PlayStation Vita, Linux, Android, BlackBerry 10, web
browsers, Flash, Windows Phone 8, and Wii U
SPL Pro by Studio Six Digital
“SPL Pro is a professional-grade sound level meter for your iPhone. It incorporates all the features of a dedicated SPL meter -- ANSI modes Slow, Fast, Impulse, Peak, and Leq, A and C weighting, Octave band filters, and the ability to be calibrated” (Studio Six Digital 2013).
SPL Graph by Studio Six Digital.
“SPL Graph is an audio level chart recorder for the iPhone and iPod Touch. It works by averaging the SPL for one second, applying an optional weighting filter, and plotting the sound level. You can optionally record the audio for the graph, and even email graph results at the end of a test” (Studio Six Digital 2013).
SPL Meters Settings
• A-weighting versus C-weighting• Fast or slow response • High or low (volume range)
Remember, A-weighting is close to human frequency response whilst C-weighting has a flatter frequency response
AcousticsReflections / Diffraction / Diffusion
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