Correct calculation of delay of release in niScope_ConfigureTriggerDigital
In the case where we use the delay trigger option form niScope_ConfigureTriggerDigital, the entry is a real double precision in units of seconds. This value is probably converted to periods of integer sampling dwell "behind the curtain of sorcerers." Would this conversion be better approached by a ceiling, the floor and the round function. This conversion is compatible for all versions OR Scope (and I hope future versions.)
Finally, the accuracy of the measurement of this value on a locked Tclocked PXI 5421/PXI-5122 is based on the accuracy of clock of the digitizer, the accuracy of clock PXI and precision of clock AWG. Given that the precision of the relaxation is essentially the Tclock, only the digitizer clock accuracy (since it's free during the pre-trigger scans) and the number of pre-trigger scans really add to this Tclock error?
FYI - the value is needed for gives the first phase (and in our case there is unfortunately zero displacement of first and second order phase) of a signal of our ICR mass spectrometer.
Thanks, Greg
Greg,
To lock the two planks together using TClk will configure them to start triggers and ensure that they both start together. When they are Tclked together they will recognize the triggers on the edge of the TClk. The TClks on the two cards will have a small amount of obliquity that is constant for a system and can be measured. Measurements with the system can then be adjusted to take account of the tilt. Only jitter in TClk comes from the individual advice clock jitter. If you configure the digitizer for a trigger reference the tripping time will be as accurate as it would be in a normal case, and it is possible to understand when the reference trigger occurred compared to 5421 time.
The triggering delay will be get rounded.
Stephen
Tags: NI Products
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Good, rather than as one problem, another one of my academic discussions 'how it works '.
On another forum, I debated the meaning of 'attack' and 'release' in compression. My thesis is that the attack time is how long it takes to reach the set level of gain reduction once the signal passes through the threshod... level and liberation is the opposite: reduction, once again the time it takes to come back or not gain levels once to cross the threshold down.
Another poster, who usually knows what he's talking about, the content as time attack and release are triggered, not levels reaching the threshold, but rather simply by the compressor, a level upward or downward change detection.
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I tried the same thing at the hearing and, although things are not as noticeable as Sound forge, you can see the pumping on the waveform.
I don't see that the attack and release can be quite skilled to respond to each change in level (especially on a real signal, not his test) so I have to assume that the cause is a bit more basic.
Here is a picture of the original file that I made:
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Well, I wouldn't trust in Wikipedia - especially when he's wrong!
We must look at the history of the compression, and how this was done by conventional electronic means before having any kind of idea of how it works really - and then we must keep in mind that even if software compression can move some of the apparent problems, it is not necessarily a good thing to do.
The initial problems with compression were double, when it came to the electronic traditional compressors. First, they took the time to analyze the incoming signals; Second, they took even more time to respond to the changes. It is usually because the element doing the control signal (and there were several different methods) also had a finite response time. Usually the response of the control element has been physically forced, and ultimately limited the attack time - even if you can detect a more rapid change, you could not apply it more quickly - you could not delay the release, that needed to be addressed in real time. The response of the detector is essentially based on the amplitude - if the first half cycle exceeds the amplitude threshold, then theoretically a corresponding signal is sent to the control element. The detector, but always follows the the envelope amplitude of the received signal, and this is what determines, by the controls, the compression ratio. The decay time depended entirely on controls of that - at the time wherever the envelope of the signal is less than the threshold, the rate of decay sets in. If the signal rises to the top, then decay stops - after another attack of time spent.
The threshold setting determines the point at which the control starts, and report control determines the rate of Exchange used at that time - and that's why Wikipedia quote is bad, because the absolute level has not been determined at all - just the rate to which the control signal is going in this direction. It may be supplanted by a change of the signal level.
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;
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values (1, 0,.1, 159, 159, 1);
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values (3,.2,.3, 179, 159, 1);
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values (4,.1,.2,, 250, 300, 1);
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values (5,.2,.3, 320, 250, 1);
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values (6,.3,.4,, 250, 380, 1);
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values (7,.2,.3, 388, 379, 1);
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values (8,.3,.4,, 379, 388, 1);
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values (9,.4,.5, 388, 400, 1);
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values (10, 499, 500, 2 1.5,.6,);
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values (11,.5,.6, 420, 448, 2);
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values (14,.9, 1, 560, 570, 2);
commit;Thanks for the data!
My test:SQL>r 1 SELECT a, prof, AVERAGE, region, 2 CASE 3 WHEN MOD(rn, &&s) = 0 OR next_a IS NULL 4 THEN REGR_R2(AVERAGE, prof) OVER(PARTITION BY region ORDER BY rn ROWS BETWEEN MOD(rn - 1, &&s) PRECEDING AND CURRENT ROW) 5 END AS r_square 6 FROM (SELECT a, prof, AVERAGE, region, ROW_NUMBER() OVER(PARTITION BY region ORDER BY a) AS rn, 7 LEAD(a) OVER(PARTITION BY region ORDER BY a) AS next_a 8* FROM TABLEAAA) a old 3: WHEN MOD(rn, &&s) = 0 OR next_a IS NULL new 3: WHEN MOD(rn, 10) = 0 OR next_a IS NULL old 4: THEN REGR_R2(AVERAGE, prof) OVER(PARTITION BY region ORDER BY rn ROWS BETWEEN MOD(rn - 1, &&s) PRECEDING AND CURRENT ROW) new 4: THEN REGR_R2(AVERAGE, prof) OVER(PARTITION BY region ORDER BY rn ROWS BETWEEN MOD(rn - 1, 10) PRECEDING AND CURRENT ROW) A PROF AVERAGE REGION R_SQUARE ---------- ---------- ---------- ---------- ---------- 1 195 60 1 2 185 93 1 3 153 198 1 4 92 79 1 5 109 93 1 6 133 89 1 7 100 90 1 8 92 103 1 9 134 83 1 10 168 74 1 ,001246769 11 92 80 1 12 184 117 1 13 143 89 1 14 80 94 1 15 125 92 1 16 108 85 1 17 82 81 1 18 84 88 1 19 103 103 1 20 89 73 1 ,492600029 21 103 84 1 22 112 119 1 23 89 94 1 24 91 110 1 25 136 104 1 26 85 106 1 27 148 88 1 28 91 87 1 29 108 103 1 30 101 118 1 ,014994374 31 87 67 1 32 82 86 1 33 98 100 1 34 93 107 1 35 130 81 1 36 106 129 1 37 108 90 1 38 92 115 1 39 117 131 1 40 112 101 1 ,041102439 41 107 87 1 42 126 76 1 43 99 65 1 44 129 70 1 45 138 92 1 46 111 82 1 47 103 64 1 48 111 60 1 49 92 71 1 50 116 74 1 ,227493634 51 122 73 1 52 85 87 1 53 90 70 1 54 76 78 1 55 95 69 1 56 123 102 1 57 76 82 1 58 193 107 1 59 168 144 1 60 101 111 1 ,453906354 61 254 111 1 62 83 88 1 63 80 103 1 64 80 82 1 65 86 89 1 66 101 90 1 67 90 75 1 68 93 100 1 69 78 84 1 70 84 98 1 ,374792811 71 100 60 1 72 140 60 1 73 72 93 1 74 101 198 1 75 92 79 1 76 82 93 1 77 77 89 1 78 77 90 1 79 95 103 1 80 89 83 1 ,012023849 81 106 74 1 82 128 80 1 83 99 117 1 84 74 89 1 85 145 94 1 86 115 92 1 87 65 85 1 88 70 81 1 89 74 88 1 90 72 103 1 ,000034639 91 74 73 1 92 99 84 1 93 215 119 1 94 74 94 1 95 70 110 1 96 113 104 1 97 82 106 1 98 139 88 1 99 83 87 1 100 80 103 1 ,195184476 101 86 118 1 102 94 67 1 103 82 86 1 104 63 100 1 105 84 107 1 106 145 131 1 107 95 109 1 108 104 87 1 109 94 162 1 110 87 99 1 ,084601225 111 170 87 1 112 176 76 1 113 125 65 1 114 233 70 1 115 148 92 1 116 108 82 1 117 168 64 1 118 161 60 1 119 193 71 1 120 256 74 1 ,024359842 121 205 73 1 122 197 87 1 123 313 70 1 124 269 78 1 125 154 69 1 126 158 102 1 127 120 82 1 128 111 107 1 129 132 144 1 130 141 111 1 ,317788364 131 124 111 1 132 209 88 1 133 152 103 1 134 138 82 1 135 236 89 1 136 226 90 1 137 296 75 1 138 302 100 1 139 343 84 1 140 193 98 1 ,240257995 141 76 60 1 142 95 60 1 143 123 93 1 144 76 198 1 145 193 79 1 146 168 93 1 147 101 89 1 148 254 90 1 149 83 103 1 150 80 83 1 ,031164927 151 80 74 1 152 86 80 1 153 101 117 1 154 90 89 1 155 93 94 1 156 78 92 1 157 84 85 1 158 100 81 1 159 140 88 1 160 72 103 1 ,001541019 161 101 73 1 162 92 84 1 163 82 119 1 164 77 94 1 165 77 110 1 166 95 104 1 167 89 106 1 168 106 88 1 169 128 87 1 170 99 103 1 ,285490096 171 74 118 1 172 145 67 1 173 115 86 1 174 65 100 1 175 70 107 1 176 74 81 1 177 72 104 1 178 74 99 1 179 99 110 1 180 215 125 1 ,014405909 181 74 103 1 182 70 90 1 183 113 77 1 184 82 101 1 ,591180806 184 rows selected. SQL>
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