Recovering of broadband reverberant speech signal by sub-band MINT method

A method for recovering broadband reverberant speech, which uses a subband multichannel inverse filter based on the multiple-input/output inverse theorem (MINT) proposed by M. Miyoshi and Y. Kaneda (1988), is proposed and evaluated. The MINT method involves solving simultaneous linear equations of tens of thousands of orders in the case where the reverberation time is 1 second and the sampling rate is 20 kHz. To overcome the numerical problem, the authors propose a subband MINT (SB-MINT method) in which the fullband speech signal width (0 to 10 kHz) is divided into 512 subbands and each of the subbands is processed by the MINT method to recover the effect of the reverberation. SB-MINT is evaluated for various reverberation conditions, and is found to be effective for recovery of broadband reverberant speech.<<ETX>>