PCM Decoding
PCM Decoding demand that the PCM Decoder's bit's-clock is synchronized to the PCM data signal's bit -clock. That is, they must be the same frequency and phase-aligned. If not some of the transmitted bits are read twice while others are completely missed. read more...
To perform the Experiment please follow the procedure:
1. Install the run time engine program to operate each VI.
2. Activate
the
functions generator,
scope,
and DSA
by pressing
the
from
the tool bar, and then press the
in
each.
3. Adjust the function generator using its soft controls for an output with the following specifications.
|
Wave Form Shape |
Sinusoidal |
|
Frequency |
500 Hz |
|
Amplitude |
4 Vp-p |
|
DC Offset |
0 V |
4. Adjust the scope as follows:
|
Channel 0 |
Channel 1 |
|
|
Volts/Div |
1 V |
1 V |
|
DC offset |
0 V |
0 V |
|
Time/Div |
200 µ sec |
200 µ sec |
5. Run the oscilloscope at Ch (0) and take a screen shoot for the input signal.
6. Run the oscilloscope at Ch (1) and take a screen shoot for the input signal.
7. what's the name for this distortion?
8. When audible, what does this distortion sound like?
9. Lunch the NI ELVIS II Dynamic signal analyzer VI, and it as follows:
|
Input Settings |
Source Channel to Channel 1 |
|
FFT Settings |
Frequency span to 60,000 |
|
Resolution to 400 |
|
|
Windows to 7 term B-Harris |
|
|
Trigger Settings |
Edge |
|
Frequency Display |
Units to dB |
|
Mode to RMS |
|
|
Scale to Auto |
|
|
Voltage Range to ±10 V |
|
|
Averaging |
Mode to RMS |
|
Weighting to exponential |
|
|
# of averages to 3 |
10. Run the DSA at channel 0 and take a screen shot for the input signal.
11. run the DSA at channel 1 and take a screen shot for the output signal.
12. calculate the fundamental frequency power at
|
Frequency (KHz) |
Power (dB) |
|
20 |
|
|
30 |
|
|
40 |
|
|
50 |
|
|
60 |
|
13. Sketch the relationship between frequency and power using excel sheet.