COAT - Cross-site Oldenburg-Aachener transfer-functions
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This dataset describes individual head related transfer-functions (HRTFs) as well as headphone transfer-functions (HpTFs) measured at two different sites: Institute of Technical Acoustics (ITA), RWTH Aachen,52056 Aachen, Germany, (Now: Institute for Hearing Technology and Acoustics) Medizinische Physik & Cluster of Excellence Hearing4All, Universität Oldenburg, 26111 Oldenburg, Germany As used in the publications: [1] Kohnen, M., Denk, F., Llorca-Bofi, J., Kollmeier, B., & Vorländer, M. (2021). Cross-site investigation on head-related and headphone transfer functions: variabilities in relation to loudness balancing. <em>Acta Acustica</em>, <em>5</em>, 58. https://doi.org/10.1051/aacus/2021051 [2] Denk, F., Kohnen, M., Llorca-Bofí, J., Vorländer, M., & Kollmeier, B. (2021). The “Missing 6 dB” Revisited: Influence of Room Acoustics and Binaural Parameters on the Loudness Mismatch Between Headphones and Loudspeakers. <em>Frontiers in Psychology</em>, <em>12</em>. https://doi.org/10.3389/fpsyg.2021.623670 Files are stored in the SOFA format, see www.sofaconventions.org for more information or the AES standard AES69-2015. <strong>Participants:</strong> 14 participants were measured at both sites: 'ITA1' 'ITA2' 'ITA3' 'ITA4' 'ITA5' 'ITA6' 'ITA7' 'HM08CO04' 'ER06PH18' 'GA03EJ14' 'EL08RD06' 'MI08LF31' 'ER07ED05' 'EK06AS04' Further 13 participants were measured at one site only: Aachen: 'ITA01' 'ITA03' 'ITA06-08' 'ITA11-15' 'ITA17-19' Oldenburg: 'AU05RD24' 'CH09US24' 'EN07NS03' 'ER03ED10' 'ER03IM11' 'ER04UT30' 'ER05EN06' 'ER09US30' 'IN04ER21' 'NE06RG13' 'NK07ER02' 'OF05UD28' 'SZ08CH09' <strong>Position of the microphones:</strong> ECEbl: Ear-canal entrance blocked, MEMS microphone with PIRATE plug (https://doi.org/10.5281/zenodo.2574395) ED: Measurements close to the ear drum using probe tube microphones (ETYMOTICS ER-7C). The microphone itself is positioned outside the ear canal, leaving the ear canal open. KEMAR ED: Measurements done with a KEMAR 45BB-12 using low-noise ear simulators and anthropometric ears. KEMAR ECEbl: Measurements done with a KEMAR 45BB-12 using MEMS microphone as described above in 'ECEbl'. HTX ED: GRAS headphone test fixture 45CA-9 with high-resolution ear simulator, HpTF only Further information can be found in the files. <strong>HpTFs [PA/V]:</strong> The measurements were repeated eight times. Highly significant (and obviously faulty) measurement were erased, thus, some files contain fewer than eight repetitions. Headphones used (identifier in Aachen (ITA) follow a continuous numeration while in Oldenburg the identifier is used in combination with the headphone type): At each site one sample of Beyerdynamic DT770 Pro 250 Ohm ( ITA01 | OL1 ) At each site two samples of Sennheiser HD650 ( ITA02, ITA03 | OL1, OL2 ) At each site two samples of ETYMOTICS ER-4PT earplugs ( ITA02, ITA03 | OL1, OL2 ) The recordings were equalized for the microphone, shifted in time to a common digital delay of 10 ms (441 samples at 44100 Hz) and windowed to a duration of about 93 ms (4096 samples at 44100 Hz). The resulting unit is Pa/V. Further information can be found in the files. HpTF measurements at the blocked ear canal of 'MI08LF31' using the HD650 in Aachen was sorted out due to faulty results and is therefore missing. <strong>HRTFs [dB re free-field]:</strong> Site-exclusive HRTFs (ITA followed by two digits) in Aachen contain only a frontal direction. Subjects were seated 2.25m in front of a Genelec 8030C in a hemi-anechoic chamber with absorbers on the floor between the subjects and the loudspeaker. ITA Aachen: Participants standing on a rotating table in front of a 64-loudspeaker arc (1.2m radius) in a hemi-anechoic room, see Richter, J. (2019) https://doi.org/10.30819/4906. Loudspeaker used were Tang Band W1-2025SA. Oldenburg: Participants seated, legs covered with absorbers in a fixed 87 loudspeaker set-up in a full anechoic chamber, see Denk et Al. (2018) https://doi.org/10.1177/2331216518779313. Loudspeaker used were Genelec 8030C. Measurements were divided by the free-field response of the microphones in a regularized manner. Afterwards the data was extrapolated towards lower frequencies and windowed to a length of about 8 ms (356 samples at 44100Hz) and 93 ms (4096 samples) for Aachen external participants. For 'ITA03' the probe-tube measurements are missing in Aachen. Further information can be found in the files.
本数据集记录了两种不同测试站点测得的个体头相关传输函数（Head Related Transfer-Function, HRTF）以及耳机传输函数（Headphone Transfer-Functions, HpTF）。两个测试站点分别为：德国亚琛工业大学技术声学研究所（Institute of Technical Acoustics, ITA，现更名为听力技术与声学研究所），地址52056亚琛；以及德国奥尔登堡大学医学物理与Hearing4All卓越集群，地址26111奥尔登堡。本数据集已用于以下两篇发表学术论文： [1] Kohnen, M., Denk, F., Llorca-Bofi, J., Kollmeier, B., & Vorländer, M. (2021). 跨站点头相关与耳机传输函数研究：与响度平衡相关的变异性. 《Acta Acustica》, 5, 58. https://doi.org/10.1051/aacus/2021051 [2] Denk, F., Kohnen, M., Llorca-Bofí, J., Vorländer, M., & Kollmeier, B. (2021). 再探“缺失6分贝”：房间声学与双耳参数对耳机与扬声器间响度失配的影响. 《Frontiers in Psychology》, 12. https://doi.org/10.3389/fpsyg.2021.623670 数据以SOFA格式存储，更多信息可参阅www.sofaconventions.org或AES标准AES69-2015。 **受试对象：** 共有14名在两个站点均参与测试的受试者，其编号为：'ITA1'、'ITA2'、'ITA3'、'ITA4'、'ITA5'、'ITA6'、'ITA7'、'HM08CO04'、'ER06PH18'、'GA03EJ14'、'EL08RD06'、'MI08LF31'、'ER07ED05'、'EK06AS04'。另有13名仅在单个站点参与测试： - 亚琛站点：'ITA01'、'ITA03'、'ITA06-08'、'ITA11-15'、'ITA17-19' - 奥尔登堡站点：'AU05RD24'、'CH09US24'、'EN07NS03'、'ER03ED10'、'ER03IM11'、'ER04UT30'、'ER05EN06'、'ER09US30'、'IN04ER21'、'NE06RG13'、'NK07ER02'、'OF05UD28'、'SZ08CH09' **麦克风测试位置：** 1. ECEbl：耳道入口被阻塞，使用带PIRATE接头的MEMS麦克风（https://doi.org/10.5281/zenodo.2574395） 2. ED：使用探管麦克风（ETYMOTICS ER-7C）在鼓膜附近进行测量，麦克风本体置于耳道外，耳道保持开放状态。 3. KEMAR ED：使用KEMAR 45BB-12头型模拟器搭配低噪声耳模拟器与人体耳模型完成的测量。 4. KEMAR ECEbl：使用前文所述ECEbl方案中的MEMS麦克风，搭配KEMAR 45BB-12头型模拟器完成的测量。 5. HTX ED：使用GRAS耳机测试夹具45CA-9搭配高分辨率耳模拟器完成的测量，仅包含HpTF数据。 更多详细信息可参阅数据文件。 **耳机传输函数（HpTF）[Pa/V]：** 每组测量重复8次，剔除了显著性极高且明显存在异常的测量结果，因此部分文件的重复测量次数不足8次。 所用耳机的编号规则为：亚琛（ITA）站点采用连续编号，奥尔登堡站点则结合耳机型号进行标识，具体如下： - 每个站点各使用1台拜亚动力DT770 Pro 250Ω耳机（亚琛站点编号：ITA01 | 奥尔登堡站点编号：OL1） - 每个站点各使用2台森海塞尔HD650耳机（亚琛站点编号：ITA02、ITA03 | 奥尔登堡站点编号：OL1、OL2） - 每个站点各使用2台ETYMOTICS ER-4PT耳塞式耳机（亚琛站点编号：ITA02、ITA03 | 奥尔登堡站点编号：OL1、OL2） 所有录音均针对麦克风进行了均衡处理，时间对齐至统一的10ms数字延迟（44100Hz采样率下对应441个采样点），并加窗至约93ms时长（44100Hz采样率下对应4096个采样点），最终单位为Pa/V。更多详细信息可参阅数据文件。 亚琛站点中，受试对象MI08LF31使用HD650耳机在阻塞耳道下的HpTF测量结果因异常被剔除，因此对应数据文件缺失。 **头相关传输函数（HRTFs）[相对于自由场的dB值]：** 亚琛站点专属的HRTF（编号格式为ITA加两位数字）仅包含正面方位的测量数据。 测试环境详情如下： - 亚琛ITA站点：存在两种测试布局：其一为受试者站在旋转平台上，前方为半径1.2m的64扬声器阵列，测试空间为半消声室，详见Richter, J. (2019) https://doi.org/10.30819/4906，所用扬声器为Tang Band W1-2025SA；其二为受试者坐在Genelec 8030C扬声器前方2.25m处，消声室地面在受试者与扬声器之间铺设吸声材料。 - 奥尔登堡站点：受试者就坐，腿部覆盖吸声材料，测试空间为全消声室，采用固定的87扬声器布局，详见Denk et Al. (2018) https://doi.org/10.1177/2331216518779313，所用扬声器为Genelec 8030C。 所有测量数据均经正则化处理后除以麦克风的自由场响应，随后针对低频进行外推，并加窗至约8ms时长（44100Hz采样率下对应356个采样点）；亚琛站点外部受试者的数据则加窗至约93ms时长（4096个采样点）。亚琛站点中，受试对象ITA03的探管麦克风测量数据缺失。更多详细信息可参阅数据文件。
