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A new database of head-related transfer functions (HRTFs) for accurate soundsource localization is presented through precise measurement andpost-processing in terms of improved frequency bandwidth and causality ofhead-related impulse responses (HRIRs) for accurate spectral cue (SC) andinteraural time difference (ITD), respectively. The improvement effects of theproposed methods on binaural sound localization cues were investigated. Toachieve sufficient frequency bandwidth with a single source, a one-way sealedspeaker module was designed to obtain wide band frequency response based onelectro-acoustics, whereas most existing HRTF databases rely on a two-wayvented loudspeaker that has multiple sources. The origin transfer function atthe head center was obtained by the proposed measurement scheme using a 0degree on-axis microphone to ensure accurate spectral cue pattern of HRTFs,whereas in the previous measurements with a 90 degree off-axis microphone, themagnitude response of the origin transfer function fluctuated and decreasedwith increasing frequency, causing erroneous SCs of HRTFs. To preventdiscontinuity of ITD due to non-causality of ipsilateral HRTFs, obtained HRIRswere circularly shifted by time delay considering the head radius of themeasurement subject. Finally, various sound localization cues such as ITD,interaural level difference (ILD), SC, and horizontal plane directivity (HPD)were derived from the presented HRTFs, and improvements on binaural soundlocalization cues were examined. As a result, accurate SC patterns of HRTFswere confirmed through the proposed measurement scheme using the 0 degreeon-axis microphone, and continuous ITD patterns were obtained due to thenon-causality compensation. Source codes and presented HRTF database areavailable to relevant research groups at GitHub(https://github.com/han-saram/HRTF-HATS-KAIST).

HRTF measurement for accurate sound localization cues