Sines+Noise+Transients Noise Model

Figure 10.15 illustrates the nature of the noise modeling used in [149]. The energy in each Bark band^11.12 is summed, and this is used as the gain for the noise in that band at that frame time.

Figure 10.15: Bark-band noise modeling (from [149]).

Figure 10.16 shows the frame gain versus time for a particular Bark band (top) and the piecewise linear envelope made from it (bottom). As illustrated in Figures 10.13 and 10.14, the step size for all of the Bark bands above 5 kHz is approximately 3 ms.

Figure 10.16: Amplitude envelope for one noise band (from [149]).