Remove CalcBiquadToneControl example (obsolete)

examples/Effects/CalcBiquadToneControl/CalcBiquadToneControl.ino

-/* Tone example using AudioFilterBiquad object and calcBiquad filter calculator routine.
-
-This example code is in the public domain
-*/
-
-#include <Audio.h>
-#include <Wire.h>
-#include <SPI.h>
-#include <SD.h>
-
-const int myInput = AUDIO_INPUT_LINEIN;
-// const int myInput = AUDIO_INPUT_MIC;
-
-int ToneFilter_L[]={0,0,0,0,0,0,0,0x80000000,0,0,0,0,0,0,0,0}; // defines 2 sets of coefficients, not sure max possible in
-int ToneFilter_R[]={0,0,0,0,0,0,0,0x80000000,0,0,0,0,0,0,0,0}; // time frame but probably quite a few.
-
-int updateFilter[5];
- 
-AudioInputI2S        audioInput;         // audio shield: mic or line-in
-AudioFilterBiquad    filterTone_L(ToneFilter_L);
-AudioFilterBiquad    filterTone_R(ToneFilter_R);
-AudioOutputI2S       audioOutput;        // audio shield: headphones & line-out
-
-// Create Audio connections between the components
-//                                    
-AudioConnection c1(audioInput,0,filterTone_L,0);
-AudioConnection c2(audioInput,1,filterTone_R,0);
-AudioConnection c3(filterTone_L,0,audioOutput,0);
-AudioConnection c4(filterTone_R,0,audioOutput,1);
-
-// Create an object to control the audio shield.
-// 
-AudioControlSGTL5000 audioShield;
-
-void setup() {
-  // Audio connections require memory to work.  For more
-  // detailed information, see the MemoryAndCpuUsage example
-  AudioMemory(6);
-  // Enable the audio shield, select the input and set the output volume.
-  audioShield.enable();
-  audioShield.inputSelect(myInput);
-  audioShield.volume(0.5);
-
-  calcBiquad(FILTER_PARAEQ,110,0,0.2,2147483648,44100,updateFilter);
-  filterTone_L.updateCoefs(updateFilter); // default set updateCoefs(0,updateFilter);
-  filterTone_R.updateCoefs(updateFilter);
-  calcBiquad(FILTER_PARAEQ,4400,0,0.167,2147483648,44100,updateFilter);
-  filterTone_L.updateCoefs(1,updateFilter);
-  filterTone_R.updateCoefs(1,updateFilter);
-}
-
-elapsedMillis chgMsec=0;
-float tone1=0;
-
-void loop() {
-  // every 10 ms, check for adjustment
-  if (chgMsec > 10) {
-    
-    float tone2=analogRead(15);
-    tone2=floor(((tone2-512)/512)*70)/10;
-    if(tone2!=tone1)
-    {
-      // calcBiquad(FilterType,FrequencyC,dBgain,Q,QuantizationUnit,SampleRate,int*);
-      calcBiquad(FILTER_PARAEQ,110,-tone2,0.2,2147483648,44100,updateFilter);
-      filterTone_L.updateCoefs(updateFilter);
-      filterTone_R.updateCoefs(updateFilter);
-      calcBiquad(FILTER_PARAEQ,4400,tone2,0.167,2147483648,44100,updateFilter);
-      filterTone_L.updateCoefs(1,updateFilter);
-      filterTone_R.updateCoefs(1,updateFilter);
-      tone1=tone2;
-    }
-    chgMsec = 0;
-  }
-}
-