(TDMA)
: (tdma)
. "" , ( () (F) ). (Frequency division multiplexing - FDM), , .
(Time division multiplexing - TDM), ( , ), ( ). , , .
. , - (PCM), . PCM-TDM , , , (Time division multiple access - TDMA)
, , - . , - . , ( ) . - , , ( ). - "" ("") , , , . , .
- PCM-TDM ( , ). - , , , , . , , . , , , .
, . , , . , , , . , . , .
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Emona FOTEx, - . , , , PCM-TDM TDMA . , (TDM) .
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NI ELVIS II USB-
BNC - "" (2 )
"" (2 )
:
A
- --.
1. , NI ELVIS , .
2. Emona FOTEx NI ELVIS.
3. Emona FOTEx NI ELVIS II.
4. NI ELVIS II USB.
5. NI ELVIS II, , , .
6. .
7. NI ELVISmx.
8. Mode - PCM.
9. , . 1.
1
-, . 2. 2 kHz SINE (Master Signals) -. - -, - . 3 ( ) -.
2
PCM Encoding : Master Signals , Message To CH 0 0, IN , CLK , PCM Decoding : PCM data , CLK , Reconstruction : 3 kHz LPF 3 ,
Recovered message To CH 1 1
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10. NI ELVIS II
11. , 1 (. 15)
12. Timebase ( ) , .
13. 1 , .
: , , .
PCM-TDM
- - Emona FOTEx PCM-TDM. PCM-TDM , (TDMA).
14. NI ELVIS II Function Generator ( ).
15. :
Waveshape ( ): Sine ()
Frequency (): 500
Amplitude ( ): 4
DC Offset ( ): 0
16. Mode - TDM.
17. , . 3.
3
-, . 4. 2 ( 1) 1 (INPUT 1) -, 500 ( 2) 2 (INPUT 2) -. 1 2 (OUTPUT 2) -. , , PCM-TDM.
4
PCM Encoding : Function Generator , Message-1 To CH 0 1 0, IN 1 1, IN 2 2, CLK , PCM Decoding : PCM data , PCM-TDM data PCM-TDM, CLK Reconstruction : 1 kHz LPF 1 , Recovered message-1 To CH 1 1 1, Recovered message-2 2
18. , , 1.
: , 1 . .
19. , . 5.
5
-, . 6.
6
PCM Encoding : Message-2 To CH 0 2 0, IN 1 1, IN 2 2, CLK ? PCM Decoding : PCM data , PCM-TDM data PCM-TDM, CLK , Reconstruction : Recovered message-1 To CH 1 1, Recovered message-2 2 1
20. Timebase ( ) 500 /.
21. 2 .
: , .
, .
22. . 7.
7
23. Gain Amplifier , .
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24. , .
25. .
26. Gain , -2.
27. 1 3 1.
: 1, .
, -. , PCM-TDM , PCM-. .
28. Mode - PCM.
: PCM- 12500 /.
29. , . 8.
8
30. Timebase ( ) 100 /.
: 1 .
31. Mode - TDM.
: PCM-TDM 6250 /.
2: , 1 .
32. , . 9.
9
-, . 10.
10
PCM Encoding : Message-1 To CH 0 1 0, IN 1 1, IN 2 2, CLK , PCM Decoding : PCM data , PCM-TDM data PCM-TDM, CLK , "Stepped" message-1 To CH 1 "" 1 1, Reconstruction :Recovered message-1 1, Recovered message-2 2
33. , Stop ().
34. NI ELVIS II.
35. :
Input Settings ( ) Source Channel ( ) - Scope CH1 ( 1 ) | Voltage Range 10V ( - 10 ) |
FFT Settings ( ) Frequency Span ( ) 10,000 Resolution () 400 Window () 7 Term B-Harris (- 7- ) | Averaging () Mode() RMS ( ) Weighting () Exponential () # of Averages ( ) 3 |
Triggering () Type () Edge ( ) | |
Frequency Display ( ) Units () dB ( ) Mode () RMS () Scale Auto () | Cursor Settings ( ) Cursors On ( ) () |
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36. , 1.
7