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What Is Sound1.Ppt
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What Is Sound1.Ppt

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Transcript

  • 1. What is sound? To fully understand synthesisers, synthesis and samplers, we need to be familiar with the characteristics of sound.
  • 2. What is sound?
    • Sound is the sensation we perceive when vibrations in the air are detected by our ears.
    • Our ears convert these vibrations to electrical impulses.
    • These impulses are transmitted to our brain via our nervous system.
    • Our brain then distinguishes its 3 main characteristics.
  • 3. What is sound?
    • These 3 main characteristics are termed:
      • Pitch
      • Timbre
      • Amplitude
  • 4. The 3 main characteristics of sound:
    • 1. Pitch
    • Pitch is determined by Frequency
    • Frequency is measured in Hertz (Hz)
    • Human ears perceive a range of frequencies - generally given as ranging from 20 Hertz to 20,000 Hertz (abbreviated to 20 kilo Hertz, or 20 kHz)
  • 5. The 3 main characteristics of sound:
    • 2. Timbre
    • Timbre means ‘tonal characteristics’.
    • We distinguish between different sounds according to their timbre.
    • A piano and a saxophone, both playing at the same pitch and level, still sound different - this is because they each have a different timbre.
    • Our voices also have different timbres.
    • Timbre is determined by the frequency content of a sound.
  • 6. The 3 main characteristics of sound:
    • 3. Amplitude
    • Amplitude is the loudness or volume of a sound.
    • Amplitude is measured in Decibels (dB)
    • Humans can perceive amplitude levels ranging from:
    • 0dB (a leaf falling on the grass) up to
    • 120dB (standing 20 paces from a jet engine!)
  • 7. The 3 main characteristics of sound
      • Pitch, Timbre and Amplitude are the fundamental elements to understanding what is going on when you are creating and manipulating sound.
  • 8. Pitch
    • Sounds can be:
      • low in pitch - like a bass guitar
      • high in pitch - like a crash cymbal
      • Or have a range of pitches - like a piano
      • Synths often have a keyboard - enabling you to play a tone at different musical pitches.
  • 9. Timbre
    • Sounds can be:
      • Pure sounding - like a flute
      • Rich sounding - like a string section
      • Musical sounding - like any musical instrument
      • Non-musical - like machinery noise
      • Synths have many controls - enabling you to create different musical (and non-musical) timbres.
  • 10. Amplitude
    • Sounds can be:
      • Quiet sounding - like a triangle
      • Loud sounding - like a bass drum
      • Or they may change in level over time
      • Synths have amplitude controls - enabling you to control how loud a sound is over time.
  • 11. Timbre, Pitch and Amplitude
    • Over the coming weeks we will look at the different ways that synths allow you to change these 3 fundamental characteristics.
    • You will learn how to:
      • Create and shape your own unique sounds
      • Use these sounds in your own music