Indoor and outdoor environmental data: A dataset with acoustic data acquired by the microphone embedded on mobile devices

Abstract

All mobile devices include a microphone that can be used for acoustic data acquisition. This article presents a dataset of acoustic signals related to nine environments, captured with a microphone embedded on off-the-shelf mobile devices. The mobile phone can be placed in the pants pockets, in a wristband, over the bedside table, on a table, or on other furniture. Data collection environments are bar, classroom, gym, kitchen, library, street, hall, living room, and bedroom. The data was collected by 25 individuals (15 men and 10 women) in different environments around Covilhã and Fundão municipalities (Portugal). The microphone data was sampled with 44,100 Hz into an array with 16-bit unsigned integer values in the range [0, 255] with a 128 offset for zero. The dataset presented in this paper presents at least 2000 samples of 5 s of data for each environment, corresponding to around 2.8 h for each environment into text files. In total, it includes at least 25.2 h of acoustic data for the implementation of data processing techniques, e.g., Fast Fourier Transform (FFT), and other machine learning methods for the different analysis.

Daily motionless activities: A dataset with accelerometer, magnetometer, gyroscope, environment, and GPS data

“…The mobile device automatically acquires the sensors’ data related to the different activities without motion, and the user selects the activity performed in the mobile application. During the data collection, also the data from the inertial sensors capture was acquired 17 , 18 .…”

“…Considering the environments recognized by the framework presented in previous studies 18 , 20 , we considered the environments presented in Table 2 for the analysis of the data from the different folders.…”

“…For the acoustic data, the Mel-frequency cepstral coefficients (MFCC) 22 were measured for each file. It was used for the measurement of a set of features for further analysis previously defined 18 .…”