BCN2BRNO: ASR System Fusion for Albayzin 2020 Speech to Text Challenge

Martin Kocour, Guillermo Cámbara, Jordi Luque, David Bonet, Mireia Farrús, Martin Karafiát, Karel Veselý, Jan Černocký

This paper describes joint effort of BUT and Telefónica Research on development of Automatic Speech Recognition systems for Albayzin 2020 Challenge. We compare approaches based on either hybrid or end-to-end models. In hybrid modelling, we explore the impact of SpecAugment layer on performance. For end-to-end modelling, we used a convolutional neural network with gated linear units (GLUs). The performance of such model is also evaluated with an additional n-gram language model to improve word error rates. We further inspect source separation methods to extract speech from noisy environment (i.e. TV shows). More precisely, we assess the effect of using a neural-based music separator named Demucs. A fusion of our best systems achieved 23.33% WER in official Albayzin 2020 evaluations and 13.3% WER on Albayzin 2018 evaluation set. Aside from techniques used in our final submitted systems, we also describe our efforts in retrieving high-quality transcripts for training.

doi: 10.21437/IberSPEECH.2021-24

Kocour, M, Cámbara, G, Luque, J, Bonet, D, Farrús, M, Karafiát, M, Veselý, K, Černocký, J (2021) BCN2BRNO: ASR System Fusion for Albayzin 2020 Speech to Text Challenge. Proc. IberSPEECH 2021, 113-117, doi: 10.21437/IberSPEECH.2021-24.