How to implement low pass filter using java

Question

Hello Everyone,

I am trying to implement a low pass filter in Java. My requirement is very simple,I have to eliminate signals beyond a particular frequency (Single dimension). Looks like Butterworth filter would suit my need.

Now the important thing is that CPU time should be as low as possible. There would be close to a million sample the filter would have to process and our users don't like waiting too long. Are there any readymade implementation of Butterworth filters which has optimal algorithms for filtering.

Regards,

Chaitannya

Answer 1

Like Mark Peters said in his comment: A filter which needs to filter a lot should be written in C or C++. But you can still make use of Java. Just take a look at Java Native Interface (JNI). Because of C/C++ compiles to native machine code, it will run a lot faster than running your bytecode in the Java Virtual Machine (JVM), which is in fact a virtual processor that translates the bytecode to the local machine its native code (depending on CPU instruction set like x86, x64, ARM, ....)