tilt not working

hi I am using the following to apply tilt to my player which is a charactercontroller but this has a problem that when I shake my phone the player start shaking as well along with the camera. I just want my player to ignore this shake so that the tilt can look much smoother basically I want it to be same like temple run.Any help would be greatly appreciated

void Update () { controller.Move(transform.forward speed Time.deltaTime);

     accel = Vector3.Lerp(accel, Input.acceleration, filter* Time.deltaTime);
     Vector3 dir;
     dir = new Vector3(accel.x, 0,0);
     
     // limit dir vector to magnitude 1:
     if (dir.sqrMagnitude > 1) 
     {
         dir.Normalize();
     }
     transform.position = new Vector3(Mathf.Clamp( dir.x *1.5f ,-1.5f,1.5f ), transform.position.y , transform.position.z);
     
 
 }