dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 35

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

1.4
Digital signal processing (DSC) is the arithmetic processing of real-time signals that are sampled and
digitized at regular intervals. Examples of DSC processing include the following:
Figure 1-3 shows an example of analog signal processing. The circuit in the illustration filters a signal from
a sensor using an operational amplifier and then controls an actuator with the result. Since the ideal filter is
impossible to design, the engineer must design the filter for acceptable response, considering variations in
temperature, component aging, power-supply variation, and component accuracy. The resulting circuit
typically has low noise immunity, requires adjustments, and is difficult to modify.
The equivalent circuit using a DSC is shown in Figure 1-4 on page 1-6. This application requires an
analog-to-digital (A/D) converter and digital-to-analog (D/A) converter in addition to the DSC.
Freescale Semiconductor
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Sensor
Filtering
Convolution (mixing two signals)
Correlation (comparing two signals)
Rectification, amplification, and transformation
Input
from
Introduction to Digital Signal Processing
x(t)
Frequency
t
x(t)
f
c
Figure 1-3. Analog Signal Processing
Ideal
Filter
R
i
Frequency Characteristics
f
y t ( )
---------
x t ( )
Analog Filter
Introduction
=
–
R f
----- -
R i
R
+
-
--------------------------- -
1
f
C
+
f
jωR f C f
1
Introduction to Digital Signal Processing
y(t)
Actuator
Output
y(t)
to
Actual
Filter
AA0003
1-5