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11-10-11 Sound and the Auditory System Continued

11-10-11 Sound and the Auditory System Continued - PSY402...

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PSY402 Sensation and Perception November 10, 2011 Sound and the Auditory System Continued Effect of missing fundamental: Effect of missing fundamental frequency o Removal of 1 st harmonic results in sound with same perceived pitch (note), but different timbre Musical scales and frequency Letters in musical scale repeat Notes with same letter name (separated by octaves) have fundamental frequencies that are multiples of each other o These notes have same tone chroma o We perceive such notes as similar to one another Audibility curve (thresholds) 100Hz need 40dB to hear it 1000Hz 0dB 5000Hz negative dB Everything below – we can’t hear, above curve – we can Curve flattens out as intensity increases o See graph below Range of hearing Humans 20Hz – 20,000Hz Audibility curve – threshold of hearing in relation to frequency o Most sensitive to 2000-4000Hz Auditory response area : Falls between audibility curve and threshold for feeling o Shows range of response for human audition Equal loudness curves : Relative to a standard 1000Hz tone o Participants match the perceived loudness of all other tones to the 1000Hz standard. o Resulting curve shows that tones sound: Almost equal loudness at 80dB Softer at 40dB for high and low frequencies than at other frequencies
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o Hearing range in other animals: The Ear Outer ear: Pinna with auditory canal
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