sound input

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  • Sound Input
    • When a sound is made and fed into a microscope, it creates an analouge signal
      • EG, Oscilloscope.The signal is made up of consistantly changing voltage
    • If sound is entered into a computer, it has to be encoded as a digital signal. To do this, the sound is sampled. The voltage is measured many times a second, and a digital equivalent of the waveform is produced.
    • High sampling rates measures the voltage up to 50000 times each second, producing good qaulity sound but large file sizes
    • The sample rate controls the quality of the sound produced, as the waveform is closer to the original.
    • Music can be entered into a computer though instruments linked to the computer via Musical Instrument Digital Interface
      • A digital keyboard has black and white keys like a piano, but also has sliders and voice controls to change the sound produced, so that music can sound as if it is being played by a violin or a flute rather than a keyboard.
        • The instrument can also add background rhythms to support the player.
        • Composers  can also play the piece of music serveral times, each as a different instrument, and the sounds can then be mixed to create the illution of an orchestra


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