Sound strength parameter G determined from uncalibrated room impulse responses measurements of concert halls using a set of window functions and lengths

The sound strength factor G computed using two hundred and eighty seven time windows in six frequency bands from two hundred and seventy seven uncalibrated room impulse responses (RIRs) corresponding to seven concert halls is reported. The RIRs were collected from the website of the Concert Hall Research Group of the Acoustical Society of America. The raw, processed, and compared data are provided as coma delimited, mat files and figures as well as the codes implementing the method. The maximum error across halls for mid frequencies using Flat-Top window of 30 ms was 1 dB. Figures p1, p2, p3 and p4 show the summary of the data for the 1/1 octave band centered at 125 Hz, the low frequencies, the mid frequencies, and the high frequencies, respectively. The summary data are the mean error, maximum error and correlation across halls for the average G of each hall using seven time window functions and forty-one time window lengths for each window function. The whole data can be accessed in the folder DAT_files. The data is divided in 6 groups. In the first group, the strength factor G is estimated for the six 1/1 octave frequency bands from 125 Hz to 4 kHz. Each file contains a table of six columns corresponding to the frequency bands and a number of rows corresponding to the source-receiver combinations. Each file is labelled G_R_W_L.dat. R codes the concert hall: BM: Baltimore. Joseph Meyerhoff Hall, 30 BS: Boston. Symphony Hall, 42 BK: Buffalo. Kleinhans Music Hall, 72 PA: Philadelphia. Academy Of Music, 36 WM: Worcester. Massachusetts. Mechanics Hall, 25 CS: Cleveland. Severance Hall, 36 WK: Washington. D.C. JFK Center, 36 W codes the window function: TW: Taylor, c=32 FT: Flattop, c=21 RW: Rectangular, c=100 HN: Hann, c=46 HM: Hamming, c=48 BW: Blackman, c=37 BH: Blackman Harris, c=31 L codes the minimum required time for a 5 dB rejection criterion. The codes are the following: 00, 01, …, 40. The window length can be calculated as Δt=2 c/100 L, where the value of c is given in the previous list. A group (b) of two hundred and eighty seven files contains the average G for each of the seven halls in each row. This second group is coded as G_b_W_L.dat. A group (c) comprises the average for low, mid , and high frequencies coded as G_c_low.dat, G_c_mid.dat, and G_c_hig.dat. The columns of each file correspond to the halls and the rows to the windows. Each row correspond to a window length and each consecutive group of forty-one rows correspond to a window function. (e.g. the first forty-one correspond to a Taylor window with L of 0 ms, 1 ms, 2 ms, …, 40 ms, respectively). Groups (d), (e), and (f), are the data reported in figures p1-p4 obtained by comparison with results of G reported in the literature. All this data can be generated using the Matlab code result_figures.m and the Mat files. In turn, the mat files can be generated using the code calculate_Num_Den.m and the other auxiliary codes provided in the Matlab_code folder.本文报道了基于277条未校准房间脉冲响应（Room Impulse Responses, RIRs）计算得到的声强因子G，该数据集对应7座音乐厅，共使用6个频带、287个时间窗完成计算。所有房间脉冲响应采集自美国声学学会（Acoustical Society of America）音乐厅研究组的官方网站。 原始数据、处理后数据与比对数据以逗号分隔格式文件、MAT文件及可视化图形形式提供，同时附带实现本研究方法的代码。采用30 ms平顶窗（Flat-Top window）计算中频段时，各音乐厅的最大误差为1 dB。 图p1、p2、p3、p4分别展示了中心频率为125 Hz的1/1倍频带、低频段、中频段及高频段的数据汇总结果。汇总数据包含各音乐厅平均声强因子G的平均误差、最大误差及跨音乐厅相关性，其中每座音乐厅的平均G值基于7种窗函数，以及每种窗函数对应的41种窗长计算得到。完整数据集可于DAT_files文件夹中获取。 数据集共分为6组： 第一组：针对125 Hz至4 kHz的6个1/1倍频频带估算声强因子G。每个文件包含6列（对应各频带）与若干行（对应声源-接收点组合）的数据表格，文件命名格式为`G_R_W_L.dat`。 其中R代表音乐厅，编码对应关系如下： BM：巴尔的摩·约瑟夫·迈耶霍夫音乐厅（座位数30） BS：波士顿·交响音乐厅（座位数42） BK：布法罗·克莱恩斯音乐堂（座位数72） PA：费城·音乐学院（座位数36） WM：伍斯特市马萨诸塞州机械厅（座位数25） CS：克利夫兰·塞弗伦斯音乐厅（座位数36） WK：华盛顿特区肯尼迪中心（座位数36） W代表窗函数，编码对应关系如下： TW：泰勒窗（参数c=32） FT：平顶窗（参数c=21） RW：矩形窗（参数c=100） HN：汉宁窗（参数c=46） HM：汉明窗（参数c=48） BW：布莱克曼窗（参数c=37） BH：布莱克曼-哈里斯窗（参数c=31） L代表满足5 dB抑制准则的最小所需时长，编码为00、01、…、40。窗长可通过公式Δt=2c/100×L计算，其中c值见前述窗函数列表。 第二组（b）：包含287个文件，每行对应7座音乐厅各自的平均G值，文件命名格式为`G_b_W_L.dat`。 第三组（c）：包含低频、中频、高频的平均G值，对应文件分别为`G_c_low.dat`、`G_c_mid.dat`及`G_c_hig.dat`。每个文件的列对应各音乐厅，行对应窗函数与窗长：每一行对应一种窗长，每连续41行对应一种窗函数（例如前41行分别对应泰勒窗，L依次取0 ms、1 ms、2 ms、…、40 ms）。 第四、五、六组（d、e、f）：对应图p1-p4中展示的、与文献报道的G值比对得到的数据集。 所有数据均可通过MATLAB代码`result_figures.m`及MAT文件生成；而MAT文件则可通过代码`calculate_Num_Den.m`及`Matlab_code`文件夹中提供的其他辅助代码生成。