read() [3/4]

float erisAudioAnalyzeFFT1024::read ( unsigned int  binFirst, unsigned int  binLast, FFTReadRange *  fftRR = NULL  )

inline

Definition at line 167 of file eris_analyze_fft1024.h.

                                                                                       {
        float32_t maxf = 0;
        float32_t powerf = 0;
        uint32_t peak_index;
        uint32_t span;
 
        span = binLast - binFirst;
        if(span<1) return 0.0;
 
        if (binFirst > binLast) {
            unsigned int tmp = binLast;
            binLast = binFirst;
            binFirst = tmp;
        }
        if(fftRR){
            fftRR->peakBin = 0;
            fftRR->peakFrequency = 0;
            fftRR->peakValue = 0;
        }
        if (binFirst > 510) return 0.0;
        if (binLast > 511) binLast = 511;
        arm_power_f32((float32_t*)&output[binFirst], span, &powerf);
        arm_max_f32((float32_t*)&output[binFirst], span, &maxf, &peak_index);   
        if(fftRR){
            arm_sqrt_f32((powerf)/(32768.0/subsample_by),&fftRR->peakValue);
            fftRR->peakBin = peak_index + binFirst;
            if(fftRR->phase < phase[fftRR->peakBin]){
                fftRR->phase = phase[fftRR->peakBin];
            }else fftRR->phase = phase[fftRR->peakBin];
        }
        return maxf;
    }

References phase, and subsample_by.