The Doppler Effect Delay Perception SPL Meters AUD202 Audio and Acoustics Theory.

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Presentation transcript:

The Doppler Effect Delay Perception SPL Meters AUD202 Audio and Acoustics Theory

Psychoacoustics Perception of Direction Last Week >

Upcoming Events 4 Days - NIHL Report 25 Days - Sound Observations Report 35 Days - Exam

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 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

Acoustics Reflections / Diffraction / Diffusion Next Week >