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Daily Problem·Tuesday, 26 December 2023Back to today

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GCSE · Computer Science · AQA · CS3.7 — Representing sound: analogue waveform sampled at a rate (Hz) and bit depth; file size = sample rate × duration × bit depth

Question

State two ways to reduce the file size of a sound recording, and give one consequence of each.

Mark scheme — two of (2 each):

  • Lower sample rate (B1) — loses higher frequencies / muffled sound (B1)
  • Lower bit depth (B1) — more quantisation noise / less dynamic range (B1)
  • Mono instead of stereo (B1) — loses spatial information (B1)
  • Apply compression (B1) — may lose some quality if lossy (B1)

4 marks · take your time before peeking.

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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.