Quantizer design Uniform quantizer is good when input is uniformly distributed When input is not uniformly distributed Non-uniform quantization regions Finer regions around more likely values Optimal quantization values not necessarily the region midpoints Approaches Use uniform quantizer anyway Optimal choice of△ Use non-uniform quantizer Choice of quantization regions and values Transform signal into one that looks uniform and use uniform qual Eytan Modiano∆ Quantizer design • Uniform quantizer is good when input is uniformly distributed • When input is not uniformly distributed – Non-uniform quantization regions Finer regions around more likely values – Optimal quantization values not necessarily the region midpoints • Approaches – Use uniform quantizer anyway Optimal choice of ∆ – Use non-uniform quantizer Choice of quantization regions and values – Transform signal into one that looks uniform and use uniform quantizer Eytan Modiano Slide 6