Figure 3

Block diagram of POLQA. This is a simplified high-level block diagram of POLQA. POLQA carries out alignment per frame and estimates the degraded signal sample rate. The main perceptual model (shown in panel titled ‘main’ in this figure and detailed in Figure 4) is executed four times with different parameters based on whether big distortions are flagged by the first model. Disturbance densities are calculated for each perceptual model and the integrated model to output a MOS estimate.