Figure 5

Propagation error histograms measured in a speech enhancement system and in an error concealment system. Left: normalized frequency domain histogram of the propagation error \(\bar {E}_{\ell }(k) = S_{\ell }(k) - \widehat {S}_{\ell }^{+}(k)\) measured in a speech enhancement system from Section 1; right: normalized time domain histogram of the propagation error \( \bar {e}(n) = s(n)-\hat {s}^{+}(n)\) measured in an error concealment system from Section 1 assuming that \( E \{ (s^{+} - \hat {s}^{+})^{2} \} \) is zero [26].