analyze()

void erisAudioAnalyzeFFT1024::analyze

(

void

)

Definition at line 143 of file eris_analyze_fft1024.cpp.

{
    float p;
 
    if (is_analyzed) return;
    //(NVIC_DISABLE_IRQ(IRQ_SOFTWARE));
 
    apply_window_to_fft_buffer_f32((float32_t*)tmp_buffer, window_f32);
    arm_fill_f32(0,(float32_t*)&tmp_buffer[1024],1024);
    arm_cfft_radix4_f32(&fft_inst, (float32_t*)tmp_buffer);
    //extract the polar phase from the interleaved real and imag 
    
    for(int16_t i=0;i < 1024;i+=2){
        p = normalized_atan2(tmp_buffer[i],tmp_buffer[i+1]);
        if (!std::isfinite(p)) p = 0;
        phase[i/2] = (phase[i/2] + (360.0 * (p/4.0)))/2.0;
    }
    
    // Process the data through the Complex Magnitude Module for calculating the magnitude at each bin 
    arm_cmplx_mag_f32((float32_t*)tmp_buffer, (float32_t*)tmp_buffer, 1024);
    for(int16_t i=0;i < 1024;i+=2){
        //arm_cmplx_mag_f32((float32_t*)tmp_buffer, (float32_t*)output, 1024);
        output[i] = (output[i] + tmp_buffer[i]) / 2.0;
    }
    
 
    //(NVIC_ENABLE_IRQ(IRQ_SOFTWARE));
 
    //spectralFilter();
 
    outputflag = false; //current frame is analyzed and ready to use
    is_analyzed = true; 
    return;
}

References apply_window_to_fft_buffer_f32(), fft_inst, is_analyzed, normalized_atan2(), outputflag, p, phase, and window_f32.

Referenced by AppCQT::update().

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