Speech recognition Speech communication Speaker recognition Speech processing Calibration Deep neural networks Gaussian Mixture Model Speech Acoustic conditions Bottleneck features Computational linguistics Computer aided instruction Language recognition Speaker recognition evaluations Speaker recognition system Speech activity detection Speech activity detections Spoken language recognition Astronomía BIBLIOTECOLOG�IA CIENCIAS DE LA INFORMACI�ON Character recognition Computer assisted language learning Computer-assisted language learning DOCUMENTACI�ON DOCUMENTATION Database systems E-learning Galaxias INFORMATION SCIENCE