Energy Decay Relief (EDR)

The energy decay relief (EDR) generalizes the EDC to multiple frequency bands:

$$\hbox{EDR}(t_n,f_k) \mathrel{\stackrel{\Delta}{=}}\sum_{m=n}^M \left\vert H(m,k)\right\vert^2$$

where $H(m,k)$ denotes bin $k$ of the short-time Fourier transform (STFT) at time-frame $m$ , and $M$ is the number of frames.

• FFT window length $\approx 30-40$ ms
• $\hbox{EDR}(t_n,f_k)$ = total signal energy remaining at time $t_n$ sec in frequency band centered at $f_k$