Patent Document ID: 9288576
Application ID: 14379144
Patent Flag: 1

Claim One:
1. A dereverberation parameter estimation device comprising: a memory storing a parameter of a linear filter for removing a non-fluctuating reverberation component contained in a speech input signal, and a parameter of a non-linear filter for removing a fluctuating reverberation component contained in the speech input signal; and a processor that estimates a dereverberation parameter for acquiring a direct sound by removing the reverberation components contained in the speech input signal, and that stores the dereverberation parameter in the memory as the parameter of the linear filter and the parameter of the non-linear filter, wherein the processor is configured to: read the parameter of the linear filter from the memory, and generates an estimated value of a linear dereverberation signal by removing the non-fluctuating reverberation component contained in the speech input signal using the linear filter; read from the memory the parameter of the non-linear filter, and generates estimated values of the fluctuating reverberation component and the direct sound component contained in the estimated value of the linear dereverberation signal using the non-linear filter; based on the estimated values of the fluctuating reverberation component and the direct sound, update the parameters of the variation reverberation component and the direct sound component constituting the parameter of the non-linear filter; and successively update the parameter of the linear filter based on the parameters of the updated fluctuating reverberation component and direct sound component.