Motorola Digital Photo Keychain 24-Bit Digital Signal Processor 用户手册
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
c k
( )
n
k
–
(
)
×
k
0
=
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