Sound event classification using neural networks and feature selection based methods

Ahmed, Ammar; Serrestou, Youssef; Raoof, Kosai; Diouris, Jean-François

doi:10.1109/eit51626.2021.9491869

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…The database was processed to obtain uniform characteristics. Ten-second audio files were extracted with a sampling rate of 441,000 Hz, resulting in 750 files of 10-s length with a total duration of 125 min for each recording [ 51 ].…”

Section: Methodsmentioning

confidence: 99%

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Empirical Mode Decomposition-Based Feature Extraction for Environmental Sound Classification

Ahmed

Serrestou

Raoof

et al. 2022

Sensors

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In environment sound classification logs, Mel band energies (MBEs) are considered as the most successful and commonly used features for classification. The underlying algorithm, fast Fourier transform (FFT), is valid under certain restrictions. In this study, we address these limitations of Fourier transform and propose a new method to extract log Mel band energies using amplitude modulation and frequency modulation. We present a comparative study between traditionally used log Mel band energy features extracted by Fourier transform and log Mel band energy features extracted by our new approach. This approach is based on extracting log Mel band energies from estimation of instantaneous frequency (IF) and instantaneous amplitude (IA), which are used to construct a spectrogram. The estimation of IA and IF is made by associating empirical mode decomposition (EMD) with the Teager–Kaiser energy operator (TKEO) and the discrete energy separation algorithm. Later, a Mel filter bank is applied to the estimated spectrogram to generate EMD-TKEO-based MBEs, or simply, EMD-MBEs. In addition, we employ the EMD method to remove signal trends from the original signal and generate another type of MBE, called S-MBEs, using FFT and a Mel filter bank. Four different datasets were utilised and convolutional neural networks (CNN) were trained using features extracted from Fourier transform-based MBEs (FFT-MBEs), EMD-MBEs, and S-MBEs. In addition, CNNs were trained with an aggregation of all three feature extraction techniques and a combination of FFT-MBEs and EMD-MBEs. Individually, FFT-MBEs achieved higher accuracy compared to EMD-MBEs and S-MBEs. In general, the system trained with the combination of all three features performed slightly better compared to the system trained with the three features separately.

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Section: Methodsmentioning

confidence: 99%

“…All the parameters were selected according to the baseline model mentioned by the authors in order to evaluate the same system using different feature inputs. For Urbansound8K and the custom dataset, we used the CNN2 model [ 51 ] given in Table 1 .…”

Section: Methodsmentioning

confidence: 99%