Experimental results of localization of a virtual wall by means of active echolocation by untrained sighted subjects

We provide the raw and processed data of an experiment about "Localization of a virtual wall by means of active echolocation by untrained sighted persons". There were a total of 21 participants labelled S1 to S21 who did each 24 trials. In each trial, participants started from a random orientation and had to produce oral sounds and orient themselves towards a virtual wall at 0 degrees and a distance between 1 and 32 m, based on the auditory feedback.

In particular, we provide experimental data for each subject (in the zip file experiment_log.zip), the raw recordings of the participants in each trial (raw_audio.zip) and the processed clicks (processed_clicks.zip).

The experimental data / experimental log package contains files of the kind "SXX.mat". These are Matlab data files that contain a summary of the experimental conditions for participant SXX with XX from 1 to 24, orientation data and time stamps. In particular, each of these files contains the variables "Angles" as a cell array of 24 elements (one for trial) with a sequence of the participant's orientation at all time stamps, "Distances" with the distance of tha wall at each of the 24 trials, "SubjName" as a string "SXX" where personal data has been removed to respect confidentiality, and finally "TimeStamps" containing the time instants for which each of the angles was obtained. Note that the output variables "Angle" and "Response Latency" used in the article correspond to the last angle and last time stamp in each of the trials.

The raw audio recordings are a set of files "SXXRunYY.aiff". These are audio files (mono, 16 bit, sampling rate of 44.1 kHz) that correspond to the recording of the microphone signal close to the mouth for participant XX from 1 to 21 at trial YY from 1 to 24.

The processed clicks correspond to the individual clicks extracted from each raw recording, together with their acoustic properties. Thus, there is a file SXXRunYY.mat for each recording SXXRunYY.aiff, with the same numbering of XX and YY for participant and trial, respectively. Each file SXXRunYY.mat contains the data in a struct called "clickList", which contains the following fields:
- audio: cell array of length N (N=number of clicks), where each elements contains each separate click in a 52 ms frame
- startSample: index of the first sample of each of the N clicks in the raw audio file
- Leq: Sound Pressure Level for each of the clicks, in dB Full Scale. Add 85 dB to obtain the Sound Exposure Level
- Tclick: Duration in samples
- Tatt: Attack time in samples
- B: Bandwidth in Hz
- Fmin: Minimum frequency within the bandwidth of the click in Hz
- summary: contains the average parameters of the previous quantities for the current trial/participant.

本数据集提供了一项关于“未经训练的视力正常人士通过主动回声定位实现虚拟墙定位”实验的原始及处理后的数据。实验共涉及21名参与者，编号为S1至S21，每位参与者均进行了24次试验。在每次试验中，参与者从随机方向开始，根据听觉反馈产生口头声音，并调整自身方向，以指向0度方向的虚拟墙，距离在1至32米之间。具体而言，本数据集包括每位受试者的实验数据（存储于实验日志压缩包experiment_log.zip中），每次试验中参与者的原始录音（存储于raw_audio.zip中）以及处理后的点击声（存储于processed_clicks.zip中）。实验数据/实验日志包包含“SXX.mat”类型的文件。这些是Matlab数据文件，其中包含了编号为XX（1至24）的参与者SXX的实验条件概要、方向数据及时间戳。特别地，每个文件包含变量“Angles”，它是一个包含24个元素的单元格数组（每个试验一个），记录了参与者在所有时间戳下的方向序列；“Distances”，记录了每个试验中墙壁的距离；“SubjName”为一个字符串“SXX”，其中已移除个人信息以保护隐私，以及最后的“TimeStamps”，包含获取每个角度的时间点。请注意，文章中使用的输出变量“Angle”和“Response Latency”对应于每个试验中的最后一个角度和最后一个时间戳。原始音频录音是一系列“SXXRunYY.aiff”文件。这些是音频文件（单声道，16位，采样率为44.1 kHz），对应于参与者XX（1至21）在试验YY（1至24）中麦克风信号近嘴部的录音。处理后的点击声对应于从每个原始录音中提取的单独点击声及其声学特性。因此，对于每个录音SXXRunYY.aiff，都有一个同编号的SXXRunYY.mat文件，XX和YY分别代表参与者和试验的编号。每个SXXRunYY.mat文件包含名为“clickList”的结构体中的数据，该结构体包含以下字段：- audio：长度为N的单元格数组（N=点击数），其中每个元素包含52毫秒帧内的单独点击声；- startSample：每个N个点击在原始音频文件中的第一个样本的索引；- Leq：每个点击的声压级，以dB Full Scale为单位。加85 dB以获得声暴露级；- Tclick：持续时间（样本数）；- Tatt：攻击时间（样本数）；- B：带宽（Hz）；- Fmin：点击声带宽内的最小频率（Hz）；- summary：包含当前试验/参与者的前述参数的平均值。