tool/mbed/mbed-sdk/libraries/tests/dsp/mbed/fir_f32/main.cpp

   1 #include "mbed.h"
   2 #include "dsp.h"
   3
   4 #define BLOCK_SIZE              (32)
   5 #define NUM_BLOCKS              (10)
   6 #define TEST_LENGTH_SAMPLES     (BLOCK_SIZE * NUM_BLOCKS)
   7
   8 #define SAMPLE_RATE             (48000)
   9
  10 #define SNR_THRESHOLD_F32       (50.0f)
  11
  12 float32_t expected_output[TEST_LENGTH_SAMPLES];
  13 float32_t          output[TEST_LENGTH_SAMPLES];
  14
  15 /* FIR Coefficients buffer generated using fir1() MATLAB function: fir1(28, 6/24) */
  16 #define NUM_TAPS            29
  17 const float32_t firCoeffs32[NUM_TAPS] = {
  18     -0.0018225230f, -0.0015879294f, +0.0000000000f, +0.0036977508f, +0.0080754303f,
  19     +0.0085302217f, -0.0000000000f, -0.0173976984f, -0.0341458607f, -0.0333591565f,
  20     +0.0000000000f, +0.0676308395f, +0.1522061835f, +0.2229246956f, +0.2504960933f,
  21     +0.2229246956f, +0.1522061835f, +0.0676308395f, +0.0000000000f, -0.0333591565f,
  22     -0.0341458607f, -0.0173976984f, -0.0000000000f, +0.0085302217f, +0.0080754303f,
  23     +0.0036977508f, +0.0000000000f, -0.0015879294f, -0.0018225230f
  24 };
  25 #define WARMUP    (NUM_TAPS-1)
  26 #define DELAY     (WARMUP/2)
  27
  28 int main() {
  29     Sine_f32 sine_1KHz(  1000, SAMPLE_RATE, 1.0);
  30     Sine_f32 sine_15KHz(15000, SAMPLE_RATE, 0.5);
  31     FIR_f32<NUM_TAPS> fir(firCoeffs32);
  32
  33     float32_t buffer_a[BLOCK_SIZE];
  34     float32_t buffer_b[BLOCK_SIZE];
  35     for (float32_t *sgn=output; sgn<(output+TEST_LENGTH_SAMPLES); sgn += BLOCK_SIZE) {
  36         sine_1KHz.generate(buffer_a);           // Generate a 1KHz sine wave
  37         sine_15KHz.process(buffer_a, buffer_b); // Add a 15KHz sine wave
  38         fir.process(buffer_b, sgn);             // FIR low pass filter: 6KHz cutoff
  39     }
  40
  41     sine_1KHz.reset();
  42     for (float32_t *sgn=expected_output; sgn<(expected_output+TEST_LENGTH_SAMPLES); sgn += BLOCK_SIZE) {
  43         sine_1KHz.generate(sgn);        // Generate a 1KHz sine wave
  44     }
  45
  46     float snr = arm_snr_f32(&expected_output[DELAY-1], &output[WARMUP-1], TEST_LENGTH_SAMPLES-WARMUP);
  47     printf("snr: %f\n\r", snr);
  48     if (snr < SNR_THRESHOLD_F32) {
  49         printf("Failed\n\r");
  50     } else {
  51         printf("Success\n\r");
  52     }
  53 }