Recently, a relative transfer function (RTF)-vector-based method has been proposed to estimate the direction of arrival (DOA) of a target speaker for a binaural hearing aid setup, assuming the availability of external microphones. This method exploits the external microphones to estimate the RTF vector corresponding to the binaural hearing aid and constructs a one-dimensional spatial spectrum by comparing the estimated RTF vector against a database of anechoic prototype RTF vectors for several directions. In this paper we assume the availability of a calibrated array of external microphones, which is characterized by a second database of anechoic prototype RTF vectors. We propose a method, where the external microphones are not only exploited to estimate the RTF vector corresponding to the binaural hearing aid but also assist in estimating the DOA of the target speaker. Based on the estimated RTF vector for all microphones and both prototype databases, a two-dimensional spatial spectrum is constructed from which the DOA is estimated. Experimental results for a reverberant environment with diffuse-like noise show that assisted DOA estimation outperforms DOA estimation where the prototype database characterizing the array of external microphones is not used.
翻译:最近,根据外部麦克风来估计与双声助听器相对应的 RTF 矢量,并用外部麦克风来估计与双声助听器相对应的 RTF 矢量,并且根据所有麦克风和原型数据库的RTF 矢量估计值来比较一维空间频谱。在本文中,我们假设有一个校准的外部麦克风阵列可供使用,其特点是有二个厌食原型 RTF 矢量数据库。我们提出一种方法,即外部麦克风不仅用来估计RTF 矢量与双声助相对应,而且还用来帮助估计目标发言者的DOA 矢量。根据所有麦克风和原型数据库的RTF矢量估计值来计算出一个二维空间频谱,以此来估计DOA。一个反响环境的实验结果显示,它协助DOA 的反射波波超过DOA 麦克风的外部估计。