Acoustic and Subjective Evaluation of Brazilian Portuguese Speech Recordings Made in Critical Listening Environments
Proceedings of the ICA congress
The present work aims to characterize Brazilian Portuguese speech in realistic environments by means of acoustical parameters and subjective perception, hoping to provide data for research on auditory prostheses. Speech signals were recorded in several non-controlled environments such as restaurants, classrooms and stores. Sound pressure level, loudness and spectral content were extracted for speech and background noise separately by using recording segmentation and spectral subtraction.
... subtraction. Subjective perception was analyzed by applying listening tests with samples from the recordings. Data analysis showed an increase of 0.6 dB in the speech's SPL per each dB increase in the background noise's SPL and a great difference in overall loudness between the quietest and the noisiest environments. SPLs were also mostly coherent to those previously reported in the literature for the same type of environment. The listening tests' results, while also greatly influenced by personal taste, showed that the annoyance caused by background noise, impairment in speech intelligibility, and the effort to understand speech were correlated to the background noise level and the SNR. In general, the environments perceived as the most critical for spoken communication were those in which background noise presents the highest energy concentration in the spectral region of speech.