ITPEC FE Subject A October 2024 Question 17
ITPEC FE Subject A October 2024 — Question 17 of 60
Audio Data Size Calculation — compute max recording time from memory size and audio parameters.
Given:
- Sample size: 8 bits = 1 byte
- Sampling rate: 11,000 samples/sec
- Memory: 512 × 10⁶ bytes
Step-by-step:
- Data rate = 1 byte × 11,000 = 11,000 bytes/sec
- Time in seconds = 512 × 10⁶ / 11,000 ≈ 46,545 sec
- Time in minutes = 46,545 / 60 ≈ 775.75 → 775 min
Why not others:
- (a) 77 — off by a factor of 10
- (b) 96 — likely mixed up powers of 2 and 10
- (d) 969 — likely forgot to convert bits to bytes (divided by 8 instead of using 1 byte directly)
Key formula: max_time = memory_size / (sample_bytes × sampling_rate)
AI-generated — may contain errors
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