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88 lines
2.8 KiB
88 lines
2.8 KiB
/* TestEqualizer3General.ino Bob Larkin 22 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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* See TestEqualizer2.ino for the int16 version.
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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;
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AudioSynthWaveformSine_F32 sine1; // Test signal
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AudioFilterFIRGeneral_F32 firg1;
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AudioRecordQueue_F32 queue1; // The LSB output
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AudioConnection_F32 patchCord1(sine1, 0, firg1, 0);
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AudioConnection_F32 patchCord2(firg1, 0, queue1, 0);
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float dbA[51];
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float equalizeCoeffs[51];
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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 FIR General routine for F32 ***");
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sine1.frequency(1000.0f);
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// This simple case corresponds to Burris and Parks, "Digital Filter Design."
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// Example 3.1when sidelobes are set to 0.0.
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for (i=0; i<6; i++) dbA[i] = 0.0f;
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for (i=6; i<11; i++) dbA[i] = -120.0f;
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// Initialize the FIR with 21 points, 21 FIR coefficients and -0 dB sidelobes
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uint16_t eq = firg1.FIRGeneralNew(&dbA[0], 21, &equalizeCoeffs[0], 0.0);
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if (eq == ERR_EQ_BANDS)
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Serial.println("FIR General failed: Invalid number of frequency points.");
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else if (eq == ERR_EQ_SIDELOBES)
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Serial.println("FIR General failed: Invalid sidelobe specification.");
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else if (eq == ERR_EQ_NFIR)
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Serial.println("FIR General failed: Invalid number of FIR coefficients.");
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else
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Serial.println("FIR General initialized successfully.");
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Serial.println("FIR Coeffs");
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for(i=0; i<21; i++) Serial.println(equalizeCoeffs[i], 7);
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Serial.println("");
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// Get frequency response in dB for 200 points, uniformly spaced from 0 to 21058 Hz
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firg1.getResponse(200, dBResponse);
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Serial.println("Freq Hz, Response dB");
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for(int m=0; m<200; m++) { // Print the response in Hz, dB, suitable for a spread sheet
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Serial.print((float32_t)m * 22058.5f / 200.0f);
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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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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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i = 2;
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}
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delay(2);
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}
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