Acoustic frequency responses of an empty cuboid room

# Room frequency responses from an empty, cuboid room Room frequency responses, from a measurement campaign at the Technical University of Denmark, DK-2800 Kgs. Lyngby, DTU building 352, "flanking transmission room" 011 on 29-30th of April 2019. The measurements were conducted by Samuel A. Verburg and Manuel Hahmann. This work is funded by Villum Fonden through Villum Young Investigator grant number 19179 for the project 'Large-scale Acoustic Holography'. This dataset is licensed under CC BY 4.0. Please cite as Hahmann, Manuel; Verburg Riezu, Samuel Arturo (2021): Acoustic frequency responses of an empty cuboid room. Technical University of Denmark. Dataset. https://doi.org/10.11583/DTU.13315289 Feel free to get in touch if you have questions or would like to access the data in higher resolution. ## Room The responses were recorded in an empty, lightly damped, cuboid laboratory room with dimensions (l_x, l_y, l_z) = (3.31, 4.41, 2.97) m and volume V = 43.35 m^3, a reverberation time of approx.~T_{60} = 2.7 s and a Schröder frequency f_S = 500 Hz. ## Setup A UR5 robotic arm (Universal Robots, Odense, Denmark) was used to precisely and automatically position a 1/2 inch free field condenser measurement microphone (Brüel&Kjäer, Nærum, Denmark) at the measurement positions. A BM6 loudspeaker (Dynaudio, Skanderborg, Denmark) placed in a room corner was used to excite the room with 10 s wideband logarithmic sweeps. ## Measurement Impulse responses were measured from 20 Hz to 20 kHz with 0.1 Hz resolution. (1 Hz resolution included in the data set) A total of 2023 impulse responses were measured, distributed on seven planar, square apertures of 0.8 x 0.8 m^2 (shown as red squares in the sketch, corresponding to seven robot positions.) Each square domain constitutes a regularly spaced 17 x 17 grid with 50 mm spacing. - robot position 0 at (x,y,z) (1650, 2200, 1585) mm- robot position 1 at (x,y,z) (1250, 3000, 1585) mm- robot position 2 at (x,y,z) (2050, 3000, 1585) mm- robot position 3 at (x,y,z) (1250, 2200, 1585) mm- robot position 4 at (x,y,z) (2050, 2200, 1585) mm- robot position 5 at (x,y,z) (1250, 1400, 1585) mm- robot position 6 at (x,y,z) (2050, 1400, 1585) mm ## Repository content - empty_cuboid_room_readme.md : this readme - empty_cuboid_room_sketch.pdf : sketch drawing - empty_cuboid_room_photo.pdf : photograph - empty_cuboid_room_frequency_responses.h5 : Hierarchical Dataset with RIRs - version: timestamp when this package was created - info: this readme string - position_0...6 - frequency : frequency vector in steps of .1 Hz from 0 to 10 kHz (10001) - id : measurement sequence ordering (289) - xyz : measurement position (x,y,z) in mm (289x3) - response : response for each frequency and position (10001x289)  

# 空长方体房间的房间频率响应
本数据集源自丹麦技术大学（Technical University of Denmark，DTU）于2019年4月29至30日在其哥本哈根根措夫特市（DK-2800 Kgs. Lyngby）352号楼「侧向传声实验室」011房间开展的测量项目。测量工作由Samuel A. Verburg与Manuel Hahmann完成，本研究受维勒姆基金会（Villum Fonden）维勒姆青年研究员项目（项目编号19179）资助，项目名称为「大规模声学全息术」。本数据集采用CC BY 4.0协议授权，引用格式为：Hahmann, Manuel; Verburg Riezu, Samuel Arturo (2021): 空长方体房间的声学频率响应. 丹麦技术大学. 数据集. https://doi.org/10.11583/DTU.13315289。如有疑问或需要获取更高分辨率的数据，请随时联系。

## 测试房间
本次测试在一间空置、轻度阻尼的长方体实验室房间内完成，房间尺寸为$(l_x, l_y, l_z) = (3.31, 4.41, 2.97)$ 米，容积$V = 43.35$ 立方米，混响时间$T_{60} ≈ 2.7$ 秒，施罗德频率（Schröder frequency）$f_S = 500$ 赫兹。

## 测试装置
本次测试采用UR5机械臂（Universal Robots，欧登塞，丹麦），用于精准自动定位1/2英寸自由场电容传声器（Brüel&Kjäer，奈鲁姆，丹麦）至测量点位。测试使用放置于房间角落的BM6扬声器（Dynaudio，斯坎讷堡，丹麦），通过10秒宽带对数扫频信号激励房间声学环境。

## 测量方案
本次测量的脉冲响应覆盖20赫兹至20千赫兹频段，频率分辨率为0.1赫兹（数据集中包含1赫兹分辨率版本）。共完成2023组脉冲响应测量，分布于7个0.8×0.8平方米的平面正方形区域（示意图中以红色方块标注，对应7个机械臂站位）。每个正方形区域采用规则网格布局，包含17×17个测点，测点间距为50毫米。各站位坐标如下：
- 站位0：$(x,y,z) = (1650, 2200, 1585)$ 毫米
- 站位1：$(x,y,z) = (1250, 3000, 1585)$ 毫米
- 站位2：$(x,y,z) = (2050, 3000, 1585)$ 毫米
- 站位3：$(x,y,z) = (1250, 2200, 1585)$ 毫米
- 站位4：$(x,y,z) = (2050, 2200, 1585)$ 毫米
- 站位5：$(x,y,z) = (1250, 1400, 1585)$ 毫米
- 站位6：$(x,y,z) = (2050, 1400, 1585)$ 毫米

## 数据集内容
- empty_cuboid_room_readme.md：本说明文档
- empty_cuboid_room_sketch.pdf：测试场地示意图
- empty_cuboid_room_photo.pdf：现场照片
- empty_cuboid_room_frequency_responses.h5：包含房间脉冲响应的分层数据集，版本信息为数据包创建时的时间戳
- info：本说明文本
- position_0…6：各站位的测量数据
- frequency：频率向量，步长0.1赫兹，覆盖0至10千赫兹，共10001个点
- id：测量序列编号（共289个）
- xyz：测点三维坐标，单位为毫米，维度为289×3
- response：各频率、各测点的声学响应，维度为10001×289