ITPEC IP April 2021 Question 4
ITPEC IP April 2021 — Question 4 of 100
Using 16 bits per sample records amplitude more finely. Eight-bit encoding provides 2⁸ = 256 quantization levels, whereas 16-bit encoding provides 2¹⁶ = 65,536 levels. The smaller quantization steps represent instantaneous sound amplitude with greater precision and reduce quantization noise.
Answer (a)
Why not others:
- doubling bits per sample increases, rather than decreases, uncompressed data size
- it does not inherently reduce CPU load
- the recordable frequency range depends on sampling frequency, which is unchanged
Key rule: Bit depth controls amplitude resolution; sampling frequency controls the highest representable frequency.
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