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the signal i have is such that at the start of the samples, i have some data i need to ignore, but somewhere in the middle i have the desired data which i need to analyze, does this give some information about what type of filter (bandpass, lowpass or highpass) to be used?
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No, but it complicates your design.
How many samples will you have in a
continuous block? And how many coefficients will you have in your filter?
You may need to have a state machine that allows the filter to fill with valid samples before you consider the output of the filter valid.
What you describe is not unusual though. I have digital filters with outputs that have to be ignored for a few microseconds every millisecond, due to a local oscillator being changed. In my case, the logic processing the output of the digital filter is disabled and then re-enabled.
Cheers,
Dave
Honored Contributor
