L13-quantization-2009 - Quantization Trac D. Tran ECE...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Quantization Quantization Trac D. Tran ECE Department The Johns Hopkins University Baltimore, MD 21218 Outline Outline Quantization Nonlinear mapping Forward and inverse quantization Quantization errors Clipping error Approximation error Signal-to-noise ratio (SNR) Examples
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Quantization Quantization Sampling frequency controls the time resolution in the analog-to-digital conversion process Quantization Controls the resolution of the amplitude values Approximation of a signal source using a finite collection of discrete amplitudes Non-linear mapping: a range of amplitude is mapped to a unique level Applications A/D conversion Compression Typical Typical Quantizer Quantizer xy Q Forward Quantizer x y input output clipping clipping stepsize on quantizati : i y i x 1 i x decision boundaries quantization level or codeword   i i i i i y y x x x e i x x x 1 1 ., . , 111 110 101 000 001 010 011 100 quantization cell
Background image of page 2
3 Inverse Inverse Quantizer Quantizer yx Q Inverse Quantizer ^ -1 x y clipping i y i x 1 i x decision boundaries 111 110 101 000 001 010 011 100
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

L13-quantization-2009 - Quantization Trac D. Tran ECE...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online