Hand-BCG & SCG signals dataset

General description This repository contains Ballistocardiogram signals collected from multiple users while they were holding a mobile phone in hand and Seismocardiogram signals collected with the phone placed on their chest. It consists of 3 different datasets made up of multiple recordings from a total of 272 different users. The main characteristics of these datasets are given below. +---------------+-------------+-------------+-----------------+------------------------------+-----------------------+--------------------+------------+-----------+ | | Loc. | # users | Age range | # sessions per user | session length | Phone | Acc. Fs | Gyr. Fs | +---------------+-------------+-------------+-----------------+------------------------------+-----------------------+--------------------+------------+-----------+ | Dataset A | Hand | 112 | 20-60 | 10 | 30s | Samsung S8 | 100 Hz | 500 Hz | +---------------+-------------+-------------+-----------------+------------------------------+-----------------------+--------------------+------------+-----------+ | Dataset B | Hand | 105 | 20-32 | 1 | 30s | Google Pixel | 50 Hz | 400 Hz | +---------------+-------------+-------------+-----------------+------------------------------+-----------------------+--------------------+------------+-----------+ | Dataset C | Chest | 55 | 19-52 | 4 | 30s | Google Pixel | 50 Hz | 400 Hz | +---------------+-------------+-------------+-----------------+------------------------------+-----------------------+--------------------+------------+-----------+ Content of each dataset Each dataset is made up of multiple files, with each file corresponding to a given measurement session. The name of a given file indicates some metadata about the measurement session itselft. It is assigned based on the following template: <UserId>-<Gender>-<Age>yrs-<SignalLength>_<Year>-<Month>-<Day>_<Hour>-<Minute>-<Seconds>.csv The content of the file itself corresponds to the sensor readings collected during the measurement session. It is a collection of timestamped sensor values, reported in a comma-separated format. The first column represent the timestamp of the sensor event (in nanoseconds), the second one the type of the considered sensor and the 3 following ones the actual values along the different axis. Please refer to the official Android SensorEvent documentation for more details.

### 总体说明
本数据集仓库收录了多用户手持移动电话时采集的心冲击图（Ballistocardiogram）信号，以及将手机置于胸前时采集的心震图（Seismocardiogram）信号。本数据集包含3个独立子数据集，共计收录来自272名不同用户的多组测量记录。各子数据集的核心特征如下：

+---------------+----------+--------+----------+----------------+------------+----------------+----------------------+----------------------+
| 数据集名称 | 采集位置 | 用户数 | 年龄范围 | 单用户会话数 | 会话时长 | 手机型号 | 加速度计采样频率 | 陀螺仪采样频率 |
+---------------+----------+--------+----------+----------------+------------+----------------+----------------------+----------------------+
| 数据集A | 手持 | 112 | 20-60岁 | 10 | 30秒 | 三星S8（Samsung S8） | 100 Hz | 500 Hz |
+---------------+----------+--------+----------+----------------+------------+----------------+----------------------+----------------------+
| 数据集B | 手持 | 105 | 20-32岁 | 1 | 30秒 | Google Pixel | 50 Hz | 400 Hz |
+---------------+----------+--------+----------+----------------+------------+----------------+----------------------+----------------------+
| 数据集C | 胸前 | 55 | 19-52岁 | 4 | 30秒 | Google Pixel | 50 Hz | 400 Hz |
+---------------+----------+--------+----------+----------------+------------+----------------+----------------------+----------------------+

### 各数据集内容详情
每个子数据集均由多组文件构成，每个文件对应一次独立的测量会话。文件名遵循固定模板命名，以标识本次测量会话的元数据，命名格式为：<UserId>-<Gender>-<Age>yrs-<SignalLength>_<Year>-<Month>-<Day>_<Hour>-<Minute>-<Seconds>.csv
文件内容为测量会话期间采集的传感器读数，以逗号分隔格式存储带时间戳的传感器数值：第一列为传感器事件的时间戳（单位：纳秒），第二列为所用传感器的类型，后续三列为各轴向的实际测量值。更多细节请参考官方Android SensorEvent文档。