Data Representation

Worked examples (6)

• 1Bits per character in a character set (2 marks)
• 2Sampling rate vs sample resolution (2 marks)
• 3Calculate image file size (4 marks)
• 4ASCII and why Unicode was developed (3 marks)
• 5Calculate sound file size for stereo recording (5 marks)
• 6Effect of doubling image resolution (4 marks)

Model answers (6)

• ✓Model answer 1
• ✓Model answer 2
• ✓Model answer 3
• ✓Model answer 4
• ✓Model answer 5
• ✓Model answer 6

Worked examples (6)

• 1Convert denary to binary (3 marks)
• 2Convert binary to hexadecimal (3 marks)
• 3Convert hexadecimal to denary (4 marks)
• 4Logical binary shift (4 marks)
• 5Binary addition with overflow (4 marks)
• 6Two's complement negative number (6 marks)

Model answers (6)

• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style

Worked examples (6)

• 1Bit, nibble, byte and the prefix ladder (2 marks)
• 2Storage unit conversions (3 marks)
• 3How many files fit on a device (4 marks)
• 4Calculating an image file size (4 marks)
• 5Lossy vs lossless compression (6 marks)
• 6Run-length encoding (RLE) (5 marks)

Model answers (6)

• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — 0478 Paper 1 — style
• ✓Model answer — Adapted from 0478/12 May/Jun 2024 Q5