论文标题
HRTF测量的准确声音定位提示
HRTF measurement for accurate sound localization cues
论文作者
论文摘要
与头部相关传输功能（HRTF）的新数据库，以精确的测量和后处理，以改善的频率带宽和与头部相关的脉冲反应（HRIRS）的因果关系进行精确测量和后处理，以分别提供准确的光谱提示（SC）和间隔时间差异（ITD）。研究了所提出的方法对双耳声音定位线索的改进作用。为了通过单个源获得足够的频率带宽，设计了一个单向密封的扬声器模块，以获得基于电气的宽带频率响应，而大多数现有的HRTF数据库依靠具有多个来源的双向通风扬声器。 The origin transfer function at the head center was obtained by the proposed measurement scheme using a 0 degree on-axis microphone to ensure accurate spectral cue pattern of HRTFs, whereas in the previous measurements with a 90 degree off-axis microphone, the magnitude response of the origin transfer function fluctuated and decreased with increasing frequency, causing erroneous SCs of HRTFs.为了防止因同侧HRTF的非造成性而导致的ITD不连续，考虑到测量受试者的头部半径，获得的HRIRS被循环移动。最后，从提出的HRTF中得出了各种声音定位提示，例如ITD，室内水平差异（ILD），SC和水平平面方向性（HPD），并检查了双耳声音定位提示的改进。结果，通过提出的测量方案使用0度轴上麦克风确认了HRTF的准确SC模式，并由于非毒性补偿而获得了连续的ITD模式。源代码和介绍的HRTF数据库可用于GitHub的相关研究小组（https://github.com/han-saram/hrtf-hats-kaist）。
A new database of head-related transfer functions (HRTFs) for accurate sound source localization is presented through precise measurement and post-processing in terms of improved frequency bandwidth and causality of head-related impulse responses (HRIRs) for accurate spectral cue (SC) and interaural time difference (ITD), respectively. The improvement effects of the proposed methods on binaural sound localization cues were investigated. To achieve sufficient frequency bandwidth with a single source, a one-way sealed speaker module was designed to obtain wide band frequency response based on electro-acoustics, whereas most existing HRTF databases rely on a two-way vented loudspeaker that has multiple sources. The origin transfer function at the head center was obtained by the proposed measurement scheme using a 0 degree on-axis microphone to ensure accurate spectral cue pattern of HRTFs, whereas in the previous measurements with a 90 degree off-axis microphone, the magnitude response of the origin transfer function fluctuated and decreased with increasing frequency, causing erroneous SCs of HRTFs. To prevent discontinuity of ITD due to non-causality of ipsilateral HRTFs, obtained HRIRs were circularly shifted by time delay considering the head radius of the measurement 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 sound localization cues were examined. As a result, accurate SC patterns of HRTFs were confirmed through the proposed measurement scheme using the 0 degree on-axis microphone, and continuous ITD patterns were obtained due to the non-causality compensation. Source codes and presented HRTF database are available to relevant research groups at GitHub (https://github.com/han-saram/HRTF-HATS-KAIST).
