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Music by Handel Water Music Suite - Allegro

Music by Handel Water Music Suite - Allegro. Graphical representation of the sound wave: Waveform Amplitude Frequency (No. of waves per second) =. Speed. Wavelength. Pressure. Amplitude. Time. 1 s. Amplitude. E.g.: Frequency = 2 Hz. What we already learnt ….

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Music by Handel Water Music Suite - Allegro

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  1. Music by Handel Water Music Suite - Allegro

  2. Graphical representation of the sound wave: Waveform • Amplitude • Frequency (No. of waves per second) = Speed Wavelength Pressure Amplitude Time 1 s Amplitude E.g.: Frequency = 2 Hz What we already learnt …

  3. Why do a man and a woman sound different? Why do a violin and a piano sound different? Why do a rooster and a monkey sound different? What distinguishes one sound from another? Goto

  4. Musical Instruments Exploration • Try out the instruments. • Complete Section A on your worksheet. • Pass instrument sets onto next group. • You’ve got 5 minutes for each sets. • Total 3 sets.

  5. Harder you hit the membrane Larger amplitude of vibration Louder sound (More energy transfer) Sound Characteristic 1: Loudness The loudness of sound is dependent on the amount of energy which is transferred to the medium. It in turn is dependent on the amplitude of vibrations of the object.

  6. Sound Characteristic 1: Loudness Compare the waveforms below: Higher amplitude! What determines the loudness of sound? The amplitude of vibration.

  7. Sound Characteristic 1: Loudness Common sounds and their estimated loudness: One convenient unit of sound level: Decibel (dB) The faintest sound a human ear can hear is called the Threshold of Hearing

  8. Sound Characteristic 2: Pitch Sound waves are caused when a vibrating object introduce vibration into a medium. Vibrating objects e.g. vocal cords, guitar string & sound board, tines of tuning fork, diaphragm of a radio speaker etc. Medium e.g. air, water particles etc. How often the particles of the medium vibrate when a wave passes through the medium is referred to the frequency of a wave.

  9. Sound Characteristic 2: Pitch Compare the waveforms below: Higher frequency! What determines the pitch of sound? The frequency of vibration.

  10. Sound Characteristic 2: Pitch Each vibrating object has its own frequency. Piano & Guitar Human ?

  11. Sound Characteristic 3: Quality Similar musical notes (i.e. same pitch) sounds different on different instruments (e.g. piano and guitar). These sounds have different quality or timbre. The quality of the pitch may be due to other weaker frequencies (called overtones), or deliberately mixed (as with a synthesizer).

  12. Sound Characteristic 3: Quality Compare the waveforms below: What determines the quality of sound? The waveform.

  13. What we learnt today … depends on the amplitude of vibration Loud Soft Loudness depends on frequency Characteristics of sound Low High Pitch depends on waveform Quality or Timbre Mixed Clearer

  14. Some time for reflection…

  15. Have a sound day!

  16. As one reaches puberty, the larynx grows for both boys and girls. Most girls’ larynx however don’t grow as much as boys’. Larger larynx gives a deeper voice => lower pitch. A) Laryngeal prominence (Adam's Apple)B) Larynx (voice box) (vocal cords inside)C) Trachea (wind pipe)D) Esophagus (swallowing tube)

  17. Our larynx (vocal box) is just like a wind instrument. Discuss how blowing into a column of air changes pitch when we vary: The length of the air column Shorter column Shorter wavelength Higher frequency Longer column Longer wavelength Lower frequency Goto

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