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Computer Science · Oct / Nov 2023 · Paper 11 · Question 5

0478

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The question as text

A musician is recording herself playing the music for a song on the piano.

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  • 5(a)[5]

    Any five from:

    (The analogue sound is) recorded using a microphone
    The sound wave is sampled
    … measuring the height/amplitude
    Each amplitude has a unique binary value
    The sample rate is set
    … that is the number of samples taken per second
    The sample resolution is set
    … that is the number of bits used for each sample
    Each sample taken is converted to binary

  • 5(b)[2]

    Two from:

    Increase the sample rate
    Increase the sample resolution

  • 5(c)[3]

    Any three from:

    They want to be able to edit the original sound file
    They want the highest sound quality for the file // They want the sound to be closest to the original recording
    … using lossy would reduce the sound quality
    … using lossy will permanently remove some of the data // no data will be permanently removed with lossless

  • 5(d)[4]

    Any four from (MAX 3 for ASCII/Unicode alone):

    ASCII has limited/fewer characters // Unicode has a more characters
    ASCII covers a limited set of languages/fewer languages
    Unicode includes many/more languages/emojis
    ASCII requires 7/8 bits per character
    Unicode requires up to 16/32 bits per character
    ASCII has 128/256 characters
    Unicode has 65 536/4 294 967 296 characters // approx. 60/70 thousand/4 billion characters
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