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AUD202 Audio and Acoustics Theory. The Doppler Effect Delay Perception SPL Meters. Last Week >. Psychoacoustics Perception of Direction. Upcoming Events. 4 Days - NIHL Report 25 Days - Sound Observations Report 35 Days - Exam. Delay Perception.

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AUD202

Audio and Acoustics Theory

The Doppler Effect

Delay Perception

SPL Meters


Last Week >

Psychoacoustics

Perception of Direction


Upcoming events

Upcoming Events

4 Days - NIHL Report

25 Days - Sound Observations Report

35 Days - Exam


Delay perception
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
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 effect1
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 effect2
Doppler Effect

A moving sound source creates a pitch change with respect to a stationary listener (or vice versa).


Doppler effect3
Doppler Effect

The change of frequency due to motion


Doppler shift
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
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 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 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
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


Next Week >

Acoustics

Reflections / Diffraction / Diffusion


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