CTPR 242 Fa11 '11 - Week 3

CTPR 242 Fa11 '11 - Week 3 - MorePsychoacoustics

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More Psychoacoustics - Frequency Masking  – louder sounds cover up softer  ones, especially those nearby in frequency. - Temporal Masking  – a loud sound can cover up a  softer sound that occurs just after it, or even just before  it. - Cocktail Party Effect (binaural discrimination)  – We can  still understand understand a person at a crowded  party. A microphone cannot do this. - Curves of Equal Loudness - The Exit Sign Effect
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Curves of Equal Loudness (aka Fletcher-Munson Curves)
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Curves of Equal Loudness (aka Fletcher-Munson Curves) - Testers present sound at certain levels at different frequencies  and ask if the subjects can hear it or not; they come up with an  average curve called the minimum audible field . - Then, they present a 1 kHz tone followed by a tone of a different  frequency and ask, “Does this sound as loud as that?”  - Using this method, they derived the Curves of Equal Loudness. 
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Curves of Equal Loudness (aka Fletcher-Munson Curves) Some conclusions to draw from this: - Frequency affects the perceived loudness  of a sound - The rise around 2.5 kHz could be a function of evolution: These  frequencies correspond to roughly the sound of a twig snapping  in the forest, or the sound of a hunter moving through tall grass. -
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This note was uploaded on 12/23/2011 for the course CTPR 242 taught by Professor Holman during the Fall '08 term at USC.

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CTPR 242 Fa11 '11 - Week 3 - MorePsychoacoustics

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