ECE 4371, Fall, 2013 Introduction to Telecommunication Engineering/Telecommunication Laboratory. Zhu Han Department of Electrical and Computer Engineering Class 8 Sep. 23 th , 2013. Outline. PAM/PWM/PPM/PCM TDM Quantization SNR vs. quantization level Two optimal rules VQ quantization
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Zhu Han
Department of Electrical and Computer Engineering
Class 8
Sep. 23th, 2013
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Frequency
c
f
Time
t
Time Division Multiplexing
next turn.
, 6dB per bit
Let m(t) be a message signal drawn from a stationary process M(t)
A m A
m1= A
mL+1=A
mk mk+1 for k=1,2,…., L
The kth partition cell is defined as
Jk: mk< m mk+1 for k=1,2,…., L
d(m,vk): distortion measure for using vk to represent values inside Jk.
image and voice compression,
voice recognition
statistical pattern recognition
volume rendering
SQ
VQ
Rate (bps)
Rate Distortion Curvehistogram of typical
speech signals
^
x
y
Nonuniform QuantizerF: nonlinear compressing function
F1: nonlinear expanding function
F and F1: nonlinear compander
y
Q
F
F1
x
Example
F: y=log(x) F1: x=exp(x)
We will study nonuniform quantization by PCM example next
A law and law
EE 541/451 Fall 2006
Example 6.2 and 6.3

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Counting time
StartConversion
StartConversion
Enable
S
Q
R
Nbit Output
Counter
C
Clk
Oscillator
IN
Single slope integration