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zero crossing algorithm in microcontroller PIC or ATmega or 8051

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shahbaz.ele

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dear all
can anyone suggest me that zero crossing algo be implemented in microcontroller for data length 500 points.
i want to count the zero crossing during this time.
 

Since Zero crossings are bidirectional with no hysteresis, unless specified.
You only need to mask the "sign bit" to look at data for zero crossings.

- Initialize counter.
- Initialize data
- For N = 1 to 500 Points
- Initial data point = your Bias (or DC) slicer level reference of data for "zero crossing".
- In this case if data is just Sign bit you use either 0 or 1, otherwise Max/min/2 or any preferred "slicer level."
- Load two consecutive data reads and EX OR output
- If XOR result >0 increment counter
- Loop


:razz::shock:
 
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