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UNT PHYS 1251 - mwf24
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Physics 1251 The Science and Technology of Musical SoundPhysics 1251 Unit 2 Session 24 Review of Perception and StringsSlide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31Slide 32Slide 33Slide 34Slide 35Slide 36Slide 37Slide 38Slide 39Slide 40Slide 41Slide 42Slide 43Slide 44Slide 45Slide 46Slide 47Slide 48Slide 49Slide 50Slide 51Slide 52Physics 1251 Unit 2 Session 18 Room AcousticsSlide 54Slide 55Slide 56Slide 57Slide 58Slide 59Slide 60Slide 61Slide 62Slide 63Slide 64Slide 65Slide 66Slide 67Slide 68Slide 69Slide 70Slide 71Slide 72Slide 73Slide 74Slide 75Slide 76Slide 77Slide 78Slide 79Slide 80Slide 81Slide 82Slide 83Slide 84Slide 85Slide 86Slide 87Slide 88Slide 89Slide 90Slide 91Slide 92Slide 93Slide 94Slide 95Slide 96Slide 97Slide 98Slide 99Slide 100Slide 101Slide 102Slide 103Slide 104Slide 105Slide 106Slide 107Slide 108Slide 109Slide 110Slide 111Slide 112Slide 113Slide 114Slide 115Slide 116Slide 117Slide 118Slide 119Slide 120Slide 121Slide 122Slide 123Slide 124Slide 125Slide 126Slide 127Slide 128Slide 129Slide 130Slide 131Slide 132Slide 133Slide 134Slide 135Physics 1251Physics 1251The Science and The Science and Technology of Musical Technology of Musical SoundSoundPhysics 1251Physics 1251The Science and The Science and Technology of Musical Technology of Musical SoundSoundUnit 2Unit 2Session 24 MWFSession 24 MWFReview of Perception Review of Perception and Stringsand StringsUnit 2Unit 2Session 24 MWFSession 24 MWFReview of Perception Review of Perception and Stringsand StringsPhysics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and StringsWhy do the characters in the film clip Why do the characters in the film clip concern themselves so much with concern themselves so much with the tones produced by tapping on the tones produced by tapping on the plate?the plate?The vibration modes of the plates The vibration modes of the plates determine the timbre of the determine the timbre of the finished instrument.finished instrument.Physics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and StringsWolf TonesWolf TonesString String HarmonicsHarmonicsBody Body HarmonicHarmonicssBeats !#@Beats !#@%!!!%!!!Physics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and StringsFighting the Wolf in a Famous ViolinFighting the Wolf in a Famous Violin Stradivarius Stradivarius ViolinViolinThe solution: a The solution: a reflectorreflectorPhysics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and Strings11′ Lecture ′ Lecture (Unit 2 Review):(Unit 2 Review):•The function of the Human Ear determines the The function of the Human Ear determines the essential features of acoustics.essential features of acoustics.•Sound Intensity Level (in dB) is a logarithmic Sound Intensity Level (in dB) is a logarithmic measure of intensity.measure of intensity.•Loudness is a subjective measure of the Loudness is a subjective measure of the dynamic of sound.dynamic of sound.•Pitch, which is determined by frequency, is a Pitch, which is determined by frequency, is a measure of the highness or lowness of a measure of the highness or lowness of a musical sound.musical sound.Physics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and Strings11′ Lecture ′ Lecture (continued):(continued):• Waves are characterized byWaves are characterized byFrequencyFrequencyWavelengthWavelengthVelocityVelocity•ReflectionReflectionSpecularSpecularDiffuseDiffuseRefractionRefractionDifractionDifractionPhysics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and Strings11′ Lecture ′ Lecture (continued):(continued):•Doppler effectDoppler effect•BeatsBeats•InterferenceInterference•Room acoustics are determined by the Room acoustics are determined by the volume, surface area, shape and volume, surface area, shape and absorption properties of its contents.absorption properties of its contents.•The reverberation time of a room can be The reverberation time of a room can be calculated using the Sabine Equation.calculated using the Sabine Equation.Physics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and Strings11′ Lecture ′ Lecture (continued):(continued):•Scales are based on tones whose frequencies Scales are based on tones whose frequencies are the ratio of whole numbers.are the ratio of whole numbers.•Strings produce a harmonic series of vibrations Strings produce a harmonic series of vibrations described by the Marsenne equation.described by the Marsenne equation.•The vibration modes of the body and air cavity The vibration modes of the body and air cavity of a stringed instrument strongly modify the of a stringed instrument strongly modify the harmonic recipe produced by the string harmonic recipe produced by the string vibrations.vibrations.Physics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and StringsHow to organize so much How to organize so much information?information?By Topic:By Topic:• PhysiologyPhysiology• PerceptionPerception• Room AcousticsRoom Acoustics• Wave PropertiesWave Properties• StringsStrings- the ear is a traducer: from pressure - the ear is a traducer: from pressure fluctuations to neural stimulationfluctuations to neural stimulation- non-linear in intensity and frequency - non-linear in intensity and frequency sensitivitysensitivity- properties determine quality of - properties determine quality of soundsound- reflection, refraction, diffraction, - reflection, refraction, diffraction, Doppler effect, beats and Doppler effect, beats and inferenceinference- f determined by standing waves- f determined by standing wavesPhysics 1251Physics 1251Unit 2 Session 24Unit 2 Session 24Review of Perception and StringsReview of Perception and StringsBy Equation:By Equation:•SILSIL•PitchPitch•Inverse Square LawInverse Square Law•Reverberation TimeReverberation Time•HarmonicsHarmonics•Law of


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UNT PHYS 1251 - mwf24

Course: Phys 1251-
Pages: 135
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