user manual

ORIGIN OF DIGITAL SIGNAL PROCESSING
MOTOROLA DSP56K FAMILY INTRODUCTION 1 - 5
• Fewer components • Self-test can be built in
• Stable, deterministic performance • No filter adjustments
• Wide range of applications
•
Filters with much closer tolerances
• High noise immunity and • Adaptive filters easily implemented
power-supply rejection
A
DSP OPERATION
IDEAL
FILTER
f
f
c
FREQUENCY
GAIN
FIR FILTER
FINITE IMPULSE
RESPONSE
ck() nk–()×
k0=
N
∑
A/D D/A
x(n) y(n) y(t)x(t)
ANALOG
FILTER
f
f
c
FREQUENCY
GAIN
DIGITAL
FILTER
f
f
c
FREQUENCY
GAIN
SAMPLER AND
ANALOG-TO-DIGITAL
CONVERTER
LOW-PASS
ANTIALIASING
FILTER
DIGITAL-TO-ANALOG
CONVERTER
RECONSTRUCTION
LOW-PASS
FILTER
A
A
Figure 1-2 Digital Signal Processing
ANALOG IN ANALOG OUT