how to make a high pass filter in software?

[bulkhead]

I've searched but couldn't find any real information on this.  Anyone know how it works or have any good references I can check out?

[Admin]

Can't you just do an IF statement on your signal value?

example
if (signal is less than 150)
  signal=0;


or do something algorithmic, like:
signal=signal^3/1000; //3 is a multiplier, and 1000 keeps the value from exploding too high

[Steel_monkey]

You need to find a book about digital signal processing, digital filters are explained in almost any. I personally downloaded 600 books about electronics. It is useful reading, and there is a lot about DSP there. If You are limited in traffic, download only books about DSP. If You need more info, PM me.

[paulobrasko]

Can't you just do an IF statement on your signal value?

example
if (signal is less than 150)
  signal=0;


or do something algorithmic, like:
signal=signal^3/1000; //3 is a multiplier, and 1000 keeps the value from exploding too high

If what he is talking about filtering a signal in frequency domain, your solution would not work, example: filtering out signals with 1000 or more Hz. So going for DSP is the way to solve this problem.

Paulo Brasko

[Admin]

what about using hardware interrupts and a timer? just throw out data that isn't in your defined time range.

i guess that kinda sounds ugly though . . . a hardware filter would be more elegant . . .