Phy107Spr07Lect13

Phy107Spr07Lect13 - Vibrations of basilar membrane From...

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1 Wed. Feb. 21 Phy107 Spr07 Lect 13 1 From Last Time… Wave Properties Amplitude is the maximum displacement of string above the equilibrium position Wavelength , λ , is the distance between two successive points that behave identically Period : time required to complete one cycle Frequency = 1/Period = rate at which cycles are completed • Velocity = Wavelength/Period, v = λ / T , or v = λ f Wed. Feb. 21 Phy107 Spr07 Lect 13 2 Vibrations of basilar membrane • Different locations host bundles that send different pitch signals. Wed. Feb. 21 Phy107 Spr07 Lect 13 3 Pitch • Pitch is related mainly, although not completely, to the frequency of the sound • Pitch is not a physical property of the sound • Frequency is the stimulus and pitch is the response – It is a psychological reaction that allows humans to place the sound on a scale Wed. Feb. 21 Phy107 Spr07 Lect 13 4 Frequency Response Curves • Bottom curve is the threshold of hearing Threshold of hearing is strongly dependent on frequency Easiest frequency to hear is about 3000 Hz • When the sound is loud (top curve, threshold of pain) all frequencies can be heard equally well Wed. Feb. 21 Phy107 Spr07 Lect 13 5 Timbre • In music, the characteristic sound of any instrument is referred to as the quality of sound, or the timbre of the sound • Not all sound is a pure tone. • The quality depends on the mixture of ‘harmonics’ in the sound. • This is a mixture of other frequencies with the original. • Can completely describe the sound by only including ‘overtones’ Wed. Feb. 21 Phy107 Spr07 Lect 13 6 Quality of Sound – Tuning Fork • Tuning fork produces only the fundamental frequency
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2 Wed. Feb. 21 Phy107 Spr07 Lect 13
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This note was uploaded on 01/05/2012 for the course PHYS 107 taught by Professor N/a during the Spring '08 term at Wisconsin.

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Phy107Spr07Lect13 - Vibrations of basilar membrane From...

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