A. method: it is the equal to  “limiting filter method” + “average recursive filter method”, it will do the amplitude limiting for the new sample data each time, and send the new data to the queues to do the  average recursive filter process.

B. advantages: blend the advantages of two filtering methods,  it can eliminate impulse interference caused by deviation of sample values for the occasional pulse interference.

C. disadvantages: wasting RAM.

D. test code

#define FILTER_N 12
int Filter_Value;
int filter_buf[FILTER_N];
  
void setup() {
  Serial.begin(9600);       //initialize the serial communication 
  randomSeed(analogRead(0)); // random seed 
  filter_buf[FILTER_N - 2] = 300;
}
  
void loop() {
  Filter_Value = Filter();       // get the filter output value 
  Serial.println(Filter_Value); //  serial output
  delay(50);
}
  
// Used to randomly generate a current value of around 300
int Get_AD() {
  return random(295, 305);
}
  
// Amplitude limiting the average filter method
#define FILTER_A 1
int Filter() {
  int i;
  int filter_sum = 0;
  filter_buf[FILTER_N - 1] = Get_AD();
  if(((filter_buf[FILTER_N - 1] - filter_buf[FILTER_N - 2]) > FILTER_A) || ((filter_buf[FILTER_N - 2] - filter_buf[FILTER_N - 1]) > FILTER_A))
    filter_buf[FILTER_N - 1] = filter_buf[FILTER_N - 2];
  for(i = 0; i < FILTER_N - 1; i++) {
    filter_buf[i] = filter_buf[i + 1];
    filter_sum += filter_buf[i];
  }
  return (int)filter_sum / (FILTER_N - 1);