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81 lines
2.8 KiB
81 lines
2.8 KiB
/* TestEqualizer1.ino Bob Larkin 10 May 2020
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* This is a test of the Filter Equalizer for Teensy Audio.
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* This version is for the Chip Audette _F32 Library.
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*/
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#include "Audio.h"
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#include "OpenAudio_ArduinoLibrary.h"
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#include "DSP_TeensyAudio_F32.h"
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AudioInputI2S i2s1; // Start interrupts
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AudioSynthWaveformSine_F32 sine1; // Test signal
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AudioFilterEqualizer_F32 equalize1;
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AudioRecordQueue_F32 queue1; // The LSB output
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AudioConnection_F32 patchCord1(sine1, 0, equalize1, 0);
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AudioConnection_F32 patchCord2(equalize1, 0, queue1, 0);
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//nBands = 10 This octave band equalizer is set strangely to demonstrate the Equalizer
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float fBand[] = { 40.0, 80.0, 160.0, 320.0, 640.0, 1280.0, 2560.0, 5120.0, 10240.0, 22058.5};
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float dbBand[] = {10.0, 2.0, -2.0, -5.0, -2.0, -4.0, -20.0, 6.0, 10.0, -100};
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float equalizeCoeffs[249];
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float dt1[128];
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float *pq1, *pd1;
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int i, k;
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float32_t dBResponse[500]; // Show lots of detail
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void setup(void) {
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AudioMemory(5);
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AudioMemory_F32(10);
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Serial.begin(300); delay(1000);
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Serial.println("*** Test Audio Equalizer ***");
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sine1.frequency(1000.0f);
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// Initialize the equalizer with 10 bands, 199 FIR coefficients and -65 dB sidelobes
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uint16_t eq = equalize1.equalizerNew(10, &fBand[0], &dbBand[0], 199, &equalizeCoeffs[0], 65);
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if (eq == ERR_EQ_BANDS)
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Serial.println("Equalizer failed: Invalid number of frequency bands.");
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else if (eq == ERR_EQ_SIDELOBES)
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Serial.println("Equalizer failed: Invalid sidelobe specification.");
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else if (eq == ERR_EQ_NFIR)
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Serial.println("Equalizer failed: Invalid number of FIR coefficients.");
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else
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Serial.println("Equalizer initialized successfully.");
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// Get frequency response in dB for 500 points, uniformly spaced from 0 to 21058 Hz
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equalize1.getResponse(500, dBResponse);
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Serial.println("Freq Hz, Response dB");
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for(int m=0; m<500; m++) { // Print the response in Hz, dB, suitable for a spread sheet
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Serial.print((float32_t)m * 22058.5f / 500.0f);
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Serial.print(",");
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Serial.println(dBResponse[m]);
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}
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i = -10; k=0;
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}
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void loop(void) {
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if(i<0) i++; // Get past startup
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if(i==0) queue1.begin();
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// Collect 128 samples and output to Serial
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// This "if" will be active for i == 0
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if (queue1.available() >= 1 && i >= 0) {
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pq1 = queue1.readBuffer();
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pd1 = &dt1[0];
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for(k=0; k<128; k++) {
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*pd1++ = *pq1++;
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}
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i=1; // Only collect 1 block
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Serial.print("Maximum F32 memory usage at loop:");
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Serial.println( AudioMemoryUsageMax_F32() );
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queue1.freeBuffer();
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queue1.end(); // No more data to queue1
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}
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if(i == 1) {
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// Uncomment the next 3 lines to printout a sample of the sine wave.
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/*Serial.println("128 Samples: ");
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for (k=0; k<128; k++) {
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Serial.println (dt1[k],7); */
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}
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i = 2;
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delay(2);
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}
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