  A method for estimation of direct-to-reverberant ratio (DRR) using a
microphone array is proposed. The proposed method estimates the power spectral
density (PSD) of the direct sound and the reverberation using the algorithm
\textit{PSD estimation in beamspace} with a microphone array and calculates the
DRR of the observed signal. The speech corpus of the ACE (Acoustic
Characterisation of Environments) Challenge was utilised for evaluating the
practical feasibility of the proposed method. The experimental results revealed
that the proposed method was able to effectively estimate the DRR from a
recording of a reverberant speech signal which included various environmental
noise.
