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dsPIC30F Demonstration Program Operation
Figure 3-7 depicts the flow of data from the time the analog input is converted by the
dsPIC30F device to the time the frequency is estimated.
FIGURE 3-7:
DSP OPERATIONS FLOW DIAGRAM
T FILT
Generated
Sine Wave
Low-Pass
Filter
ADC
12-bit,
Bandpass
IIR/FIR filter
x 1 (t)
To display
x 2 (t)
8 kHz sampling x[n]
Magnitude
computation and
y[n]
256-point FFT
on LCD
peak-frequency
detection
X 2
FFT
T FFT
Figure 3-8 shows the frequency response of the IIR filter implementation. The IIR filter
is only employed for demonstrating filter operation.
FIGURE 3-8:
? 2006 Microchip Technology Inc.
FREQUENCY RESPONSE: IIR FILTER
DS70099D-page 33
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