/**
* use this method to get a hold on max amplitudes -- returns true when it's best to update the
* display
*/
public boolean needUpdate(int p, int m, int n, TextView display) {
if (max[p] > threshold) { // threshold
if ((double) max[p] > ((double) primaryMax[p] + 0.5)) {
if (MainActivity.analyzeMode) {
if (max[p] > threshold * 1.2) {
getNew[0] = false;
}
}
primaryMax[p] = max[p];
primaryFreq[p] = topFreq[p];
return false;
} else if ((double) max[p] < (double) (primaryMax[p] - 0.5)) {
note[p] = noteFinder.getNote(primaryFreq[p]);
// display.setText(Integer.toString(primaryFreq[p])+" Hz - "+note[p]);
// setPianoKey();
getNew[0] = true;
primaryMax[p] = 0;
return true;
} else {
return false;
}
} else {
getNew[0] = true;
primaryMax[p] = 0;
return false;
}
}
/**
* First, fill up the storedMaxFreq with values Once filled, get a new value every time this
* function runs -- move all the values down a slot -- put in a new value, and remove the oldest
* value Loop through storedValueAmounts, a 2D array, within each loop iteration of storedMaxFreq
* in order to fill the 2D array ([frequency value][number of occurrences]) -- check if the slot
* has duplicate values. if so, add 1 to the second dimension of that slot -- otherwise, check if
* slot is empty. if so, fill it in with the new storedMaxFreq value Using the data in
* storedMaxFreq, find a frequency to display -- Loop to sum up and average all the values in
* storedMaxFreq -- Loop to compare this average with each value in storedMaxFreq. take the value
* closest to the average (least difference between it and the average) -- Loop through
* storedValueAmounts to sum up recurrent frequencies (mostCommonSum) and their weight
* (amountOfCommonSums) -- -- sum up the frequencies that occur more than once
* (storedValueAmounts[i][1] > 0) -- -- then, amountOfCommonSums += (storedValueAmounts[i][1]+1)
* to add weight -- -- otherwise, add all unpreferred frequencies to the array list:
* unpreferredFrequencies -- Loop to remove bad values from the recurrent frequencies that we just
* added -- -- if statement ensures that the already selected "most usable" frequency isn't
* accounted for when removing bad frequencies -- -- if a value is outside a 21% margin of the
* most usable frequency, subtract it and its weight -- Loop through unpreferredFrequencies
* (frequencies that only occur once) to find decently valid values -- -- if an unpreferred value
* is still within a 10% margin of the most usable frequency, add it and weight it as 1 --
* Finally, divide the total sum by the weights (mostCommonSum/amountOfCommonSums) to get an
* average that represents the most accurate frequency -- -- return 0 if amountOfCommonSums > 0 to
* avoid accidentally dividing by 0 Update visualization display -- Get note based on the returned
* frequency -- Fill previousNotes (an ArrayList) with the previous 3 notes using the same method
* as step 1 and 2 of this function -- Loop through previousNotes to check if all notes are the
* same or not -- -- if not all the same, changeNote will be false. vice versa -- If changeNote is
* true: -- -- update previousNote to be currentNote, then update currentNote to the actual
* currentNote (previousNote is always one step behind) -- -- if currentNote != previousNote,
* meaning there is a need to update the display, then update!
*/
public void updateText(int p, int m, int n, TextView display) {
if (max[p] > threshold) { // threshold
if (storedMaxFreq.size() < 6) { // fills the array
storedMaxFreq.add(topFreq[p]);
} else { // if storedMaxFreq is full
// DEFINITIONS
int mostCommonSum = 0;
int amountOfCommonSums = 0;
boolean changeNote = true;
int[][] storedValueAmounts = new int[8][2];
ArrayList<Integer> preferredFrequencies = new ArrayList<Integer>();
int mostUsable = 0;
int overallAverage = 0;
ArrayList<Integer> unpreferredFrequencies = new ArrayList<Integer>();
// UPDATES ARRAY
ArrayList<Integer> tempStorage = new ArrayList<Integer>();
tempStorage.addAll(storedMaxFreq);
storedMaxFreq.clear();
storedMaxFreq.add(0, topFreq[p]);
storedMaxFreq.addAll(1, tempStorage);
storedMaxFreq.remove(6);
// FINDS RECURRING FREQUENCIES
for (int i = 0; i < storedMaxFreq.size(); i++) { // loop through the storedMaxFreq
for (int x = 0;
x < storedValueAmounts.length;
x++) { // loop to check for empty slots in storedValueAmounts and fill them
if (storedValueAmounts[x][0] != 0
&& storedMaxFreq.get(i)
== storedValueAmounts[x][
0]) { // if slot is filled and contents are the same, just increase the
// count by 1
storedValueAmounts[x][1] += 1;
break;
} else if (storedValueAmounts[x][0] == 0) { // if slot is empty, take it
storedValueAmounts[x][0] = storedMaxFreq.get(i);
break;
}
}
}
// GETS FREQUENCY TO DISPLAY
for (int i = 0; i < storedMaxFreq.size(); i++) { // gets overall average
overallAverage += storedMaxFreq.get(i);
}
overallAverage /= storedMaxFreq.size();
int difference = 100000;
for (int i = 0; i < storedMaxFreq.size(); i++) { // finds mostUsable
if (Math.abs(overallAverage - storedMaxFreq.get(i)) < difference) {
difference = Math.abs(overallAverage - storedMaxFreq.get(i));
mostUsable = storedMaxFreq.get(i);
}
}
for (int i = 0;
i < storedValueAmounts.length;
i++) { // loop to sum up the most common frequencies
if (storedValueAmounts[i][1] > 0) {
preferredFrequencies.add(i);
mostCommonSum +=
storedValueAmounts[i][0]
* (storedValueAmounts[i][1] + 1); // adds weight to the summing
amountOfCommonSums += (storedValueAmounts[i][1] + 1);
} else {
unpreferredFrequencies.add(storedValueAmounts[i][0]);
}
}
for (int i = 0;
i < (preferredFrequencies.size());
i++) { // loop to remove bad values from the most common frequencies
if (storedValueAmounts[preferredFrequencies.get(i)][0] != mostUsable) {
if (storedValueAmounts[preferredFrequencies.get(i)][0] < (double) mostUsable * 0.79
|| storedValueAmounts[preferredFrequencies.get(i)][0]
> (double) mostUsable * 1.21) {
mostCommonSum -=
storedValueAmounts[preferredFrequencies.get(i)][0]
* (storedValueAmounts[preferredFrequencies.get(i)][1] + 1);
amountOfCommonSums -= (storedValueAmounts[preferredFrequencies.get(i)][1] + 1);
}
}
}
for (int i = 0;
i < unpreferredFrequencies.size();
i++) { // adds back in previously removed values that were, in hindsight, pretty good
if (unpreferredFrequencies.get(i) > mostUsable * 0.9
&& unpreferredFrequencies.get(i) < mostUsable * 1.1) {
mostCommonSum += unpreferredFrequencies.get(i);
amountOfCommonSums++;
}
}
if (amountOfCommonSums > 0) {
mostCommonSum = (int) Math.round((double) (mostCommonSum / amountOfCommonSums));
} else {
mostCommonSum = 0;
}
// UPDATES NOTE & TEXT
// previousNote[p] = note[p];
note[p] = noteFinder.getNote(mostCommonSum);
int noteIndex = noteFinder.getIndex(mostCommonSum);
;
if (previousNotes.size()
< 3) { // sets how many times each note must be detected in a row before changing the
// piano visualization
previousNotes.add(note[p]);
} else {
ArrayList<String> tempStorage2 = new ArrayList<String>();
tempStorage2.addAll(previousNotes);
previousNotes.clear();
previousNotes.add(0, note[p]);
previousNotes.addAll(1, tempStorage2);
previousNotes.remove(3);
for (int i = 1; i < (previousNotes.size()); i++) {
if (previousNotes.get(i) == previousNotes.get(i - 1)) {
changeNote = true;
} else {
changeNote = false;
break;
}
}
}
if (changeNote) { // if note change required, update currentNote & previous note
previousNote[p] = currentNote[p];
currentNote[p] = note[p];
if (currentNote[p] != previousNote[p]) { // check if display update needed
display.setText(Integer.toString(mostCommonSum) + " Hz - " + note[p]);
setPianoKey();
writeToFile(timeCount + ":" + noteIndex + ";", true);
previousNoteIndex = noteIndex;
} else {
writeToFile(timeCount + ":" + previousNoteIndex + ";", true);
}
}
// OPTIONAL LOGGING
/*
String logList = "Member name: ";
for (int i = 0; i<storedMaxFreq.size(); i++){
logList += storedMaxFreq.get(i) + ", ";
}
logList += "\nstoredValueAmounts: " + Arrays.deepToString(storedValueAmounts);
Log.w("Davis", logList + "\n"+mostCommonSum+" Hz - "+note[p]); */
}
// OPTIONAL BOLDING
if (max[p] > 5) {
display.setTypeface(Typeface.create("sans-serif", Typeface.BOLD));
} else {
display.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL));
}
}
}