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Recently, a relative transfer function (RTF)-vector-based method has beenproposed to estimate the direction of arrival (DOA) of a target speaker for abinaural hearing aid setup, assuming the availability of external microphones.This method exploits the external microphones to estimate the RTF vectorcorresponding to the binaural hearing aid and constructs a one-dimensionalspatial spectrum by comparing the estimated RTF vector against a database ofanechoic prototype RTF vectors for several directions. In this paper we assumethe availability of a calibrated array of external microphones, which ischaracterized by a second database of anechoic prototype RTF vectors. Wepropose a method, where the external microphones are not only exploited toestimate the RTF vector corresponding to the binaural hearing aid but alsoassist in estimating the DOA of the target speaker. Based on the estimated RTFvector for all microphones and both prototype databases, a two-dimensionalspatial spectrum is constructed from which the DOA is estimated. Experimentalresults for a reverberant environment with diffuse-like noise show thatassisted DOA estimation outperforms DOA estimation where the prototype databasecharacterizing the array of external microphones is not used.

Assisted RTF-Vector-Based Binaural Direction of Arrival Estimation Exploiting a Calibrated External Microphone Array