Fig. 2

Measuring the power ratio of a speech signal. Illustration of the reverberation measure for a speech signal, with source-microphone distance =2 m, T ₆₀=1 s. a The measured signal z(t) (1) at the direct (solid line) and opposite (dashed line) microphones. b The power P(t) as measured by the direct (solid line) and opposite (dashed line) microphones. c The measured power ratio PR(t) (18) (solid line) and \(\frac {\left [g^{\text {dir}}(\theta)\right ]^{2} } { \bar {g}^{2} }\cdot \text {DRR}+1\) (dashed-dotted line) as a reference