ITPEC IP April 2024 Question 1
ITPEC IP April 2024 — Question 1 of 100
Figure (b) produces the required five samples at Times 1 through 5: 01 00 10 11 01. Each sampled amplitude is replaced by the nearest of the four quantization levels, whose two-bit labels from bottom to top are 00, 01, 10, and 11.
Reading figure (b) at the five vertical sampling lines gives approximately level 01 at Time 1, 00 at Time 2, 10 at Time 3, 11 at Time 4, and 01 at Time 5. This exactly matches the target code sequence.
Answer (b)
Why not others:
- (a) gives roughly 01 01 00 10 11
- (c) begins near 01, reaches 00, and then remains high at the final samples, so its sequence differs
- (d) does not reach the required quantized levels at all five sampling times
Key rule: Sampling chooses the signal value at each specified time; quantization then maps that value to the nearest permitted level before the level is encoded as bits.
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