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Second Baseline Correction (BCII)

Second Baseline Correction (BCII). Eduardo Garcia. 19/02/2009. Objectives Second Baseline Correction (BCII) Moving Average Filter Parameter N Round-off Control logic. Objectives. Corrects perturbation created by non-systematic effects during the processing time Double threshold window

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Second Baseline Correction (BCII)

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  1. Second Baseline Correction (BCII) Eduardo Garcia 19/02/2009

  2. Objectives • Second Baseline Correction (BCII) • Moving Average Filter • Parameter N • Round-off • Control logic

  3. Objectives • Corrects perturbation created by non-systematic effects during the processing time • Double threshold window • Based on • Moved Average Filter (MAF)

  4. Operation • din - bsl + offset , 0  dout  1023 • 0 , dout < 0 • din - bsl + offset - 1024 , dout > 1023 bsl calculation bsl frozen After Tail Cancellation Filter After Baseline Correction II A fixed threshold can now be applied safely Double threshold BC II • 1. Slow variations of the signal  Baseline updated • 2. Fast variations of the signal  Baseline value frozen ALTRO BCII (B. Mota)

  5. Second Baseline Correction (BCII)

  6. Moving Average Filter • Baseline: • Transformation: • Example: avgn= (xn-3+xn-2+xn-1+xn) / 4 avg5= (x2+x3+x4+x5) / 4 avgn=avgn-1+(xn-xn-4)/4 sum4-x1+x5

  7. Parameter N: frequency behavior depends on that! • Large N -> low frequency components perturbations • Small N -> high frequency components perturbations N=4 N=16

  8. N=2 N=4 N=16 N=8

  9. Round-off error

  10. Output histogram

  11. MAF Block diagram • Flexible MAF • Multiplexers control lines and register enables with the same two lines taps_en [1:0]: “00” -> 2 taps “10” -> 4 taps “11” -> 8 taps

  12. Control logic • Post-samples control -> config [5:2] pre-charge post sample counter • (evaluate post sample flag) • Pre-samples control -> config [1:0] • There is a baseline initialization of 12 samples, after that the double threshold starts to work

  13. Questions??

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