m-Bé
A guitar Tuner project made by: Guarino Yuri Pota Giuseppe Sito Leonardo It is made up of a circuit for signal amplification(using LM386 OP-AMP), and a circuit of many LEDs that display if the guitar is tuned or not. For digital signal processing we used mbed-dsp library.
Diff: main.cpp
- Revision:
- 1:45d485b8966f
- Parent:
- 0:2529b7b37e9a
--- a/main.cpp Sun Dec 09 15:58:55 2018 +0000
+++ b/main.cpp Sun Dec 09 16:04:49 2018 +0000
@@ -157,7 +157,7 @@
while(1) {
button.rise(&selectNote);
for (int k = 0; k < 1024; k++) {
- Ing[k] = (short) (analog_value.read_u16() - 0x8000); // read unsigned 16-bit and convert to signed 16-bit (subtract 32768)
+ Ing[k] = (short) (analog_value.read_u16() - 0x8000);
wait_us(1e6/SAMP_FREQ);
}
//Riempiamo il vettore per la FFT
@@ -168,7 +168,7 @@
samples[i+1] = 0;
}
arm_cfft_f32(S, samples, 0, 1);
- // Calculate magnitude of complex numbers output by the FFT.
+ // Calcola la FFT
arm_cmplx_mag_f32(samples, magnitudes, FFT_LEN);
if(c==1){
@@ -182,7 +182,7 @@
}while(j<1024/2);
float maxx=(float)max*1000/1024;
- //pc.printf("Il massimo in ampiezza è alla frequenza %f Hertz \n",(float)max*1000/1024);
+
if(maxx<82){
Led_Down=1;
Led_Up=0;
@@ -235,7 +235,7 @@
int j=2;
do{
- if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<160)&&(j*1000/1024>130))//restringo la banda a [90Hz, 130Hz]
+ if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<160)&&(j*1000/1024>130))//restringo la banda a [130Hz, 160Hz]
max=j;
j++;
@@ -265,7 +265,7 @@
int j=2;
do{
- if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<210)&&(j*1000/1024>170))//restringo la banda a [90Hz, 130Hz]
+ if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<210)&&(j*1000/1024>170))//restringo la banda a [170Hz, 210Hz]
max=j;
j++;
@@ -295,7 +295,7 @@
int j=2;
do{
- if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<260)&&(j*1000/1024>230))//restringo la banda a [90Hz, 130Hz]
+ if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<260)&&(j*1000/1024>230))//restringo la banda a [230Hz, 260Hz]
max=j;
j++;
@@ -325,7 +325,7 @@
int j=2;
do{
- if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<340)&&(j*1000/1024>310))//restringo la banda a [90Hz, 130Hz]
+ if (magnitudes[j]>magnitudes[max]&&(j*1000/1024<340)&&(j*1000/1024>310))//restringo la banda a [340Hz, 310Hz]
max=j;
j++;