参数资料
| 型号： | DM300014 |
| 厂商： | Microchip Technology |
| 文件页数： | 34/72页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO DSPICDEM 1.1 GEN PURP |
| 标准包装： | 1 |
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dsPICDEM? 1.1 Development Board User’s Guide
3.3.1.2
DSP OPERATIONS MODE
From the Menu Options display, pressing switch SW3 launches the DSP Operations
demo, which displays the digital signal values shown in Figure 3-6. This display
provides information on the various signal-processing operations that are performed on
the signal at analog input pin, AN3.
FIGURE 3-6:
DSP OPERATIONS DISPLAY
F = 1000
256 PT
IIR
MAIN – s1
B IN = 032
T FFT =018175 CY
T FILT =028649 CY
CHNGFILT – S 2
The DSP operations display shows several parameters for a sampled sinewave signal.
A fundamental sinewave signal is generated by stepping the MCP41010 digital
potentiometer (U9) output at an 8 kHz rate. The output of the digital potentiometer is
applied to a low-pass (LP) filter with a cutoff frequency of approximately 4 kHz. This LP
filter removes the high-frequency components and yields a sinewave adequate for this
demonstration. Five frequencies are developed and selected by varying potentiometer
TABLE 3-1:
FREQUENCIES VS. POTENTIOMETER SETTING
Potentiometer Setting
0 ≤ RP1 ≤ 1V
1 ≤ RP1 ≤ 2V
2 ≤ RP1 ≤ 3V
3 ≤ RP1 ≤ 4V
4 ≤ RP1 ≤ 5V
Resulting Frequency
100 Hz
500 Hz
1000 Hz
1500 Hz
2000 Hz
The filtered output of the MCP41010 is routed to pin AN3/RB3, which is an input to the
dsPIC30F 12-bit A/D converter. The A/D converter collects 256 samples from the
MCP41010 at an 8 kHz sample rate. These samples are optionally subjected to a digital
filtering algorithm implemented on the dsPIC30F. The following three digital filtering
options are provided and selected by switch SW2:
? None
? Infinite Impulse Response (IIR)
? Finite Impulse Response (FIR)
Subsequently, their spectral components are estimated. The frequency estimate of the
signal on pin AN3/RB3 is displayed on the first row of the DSP Operations display.
DS70099B-page 30
Advance Information
? 2003 Microchip Technology Inc.
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