Search

To fully utilize the possibilities given by the aircraft noise monitoring system, it should quickly, automatically and accurately identify whether the limit-exceeding noise event is caused by the aircraft operation. Due to the often delayed access to airport operation logs, the system should operate with minimal or no non-acoustic data. The paper proposes the architecture of an aircraft noise detection method, meeting the above requirements and attempts to assess its effectiveness. Proposed approach involves using the residual convolutional neural network for solving the task. The network operates on 1/3 octave noise input data and determines the similarity of the input sound to the aircraft noise. The accuracy of the proposed method for a single data frame using real-life measurements exceeds 95% for a frame length of at least 30 seconds. Further work is progressing, focusing mainly on improving the quality of training data and refining the hyperparameters of the network. [ABSTRACT FROM AUTHOR]

Copyright of Materiały Budowlane is the property of Wydawnictwo SIGMA-NOT and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Quality and usefulness of school rooms for transmission of verbal information depends on the two basic parameters: form and quantity of the reverberation time, and profitable line measurements of school rooms from the acoustic point of view. An analysis of the above-mentioned parameters in 48 class rooms and two gymnasiums in schools, which were built in different periods, shows that the most important problem is connected with too long reverberation time and inappropriate acoustic proportions. In schools built in the 1970s, the length of reverberation time is mostly within a low frequency band, while in schools built contemporarily, the maximum length of disappearance time takes place in a quite wide band of 250-2000 Hz. This exceeds optimal values for that kind of rooms at least twice, and five times in the newly built school. A long reverberation time is connected with a low acoustic absorption of school rooms. Moreover, school rooms are characterised by inappropriate acoustic proportions. The classrooms, in their relation to the height, are too long and too wide. It is connected with deterioration of the transmission of verbal information. The data show that this transmission is unequal. Automatically, it leads to a speech disturbance and difficulties with understanding. There is the need for adaptation of school rooms through increase of an acoustic absorption.