How to filter Acceleromter RAW values - pedometer?

Hy,I m using IMU sensor, from that I want to some data analysis make with RAW accelerometer - step counter.

I want to use some of the this method: Counting Steps - MathWorks MathWorks - zero crossing

but my vector of the x,y,z is too noise, how can I get smooth data? I tried to smooth the signal, but I must use 8-10 times the smooth function.

 I need some elegant way to do that. Can you give some ideas ?