Bottleneck features Speech recognition 6 Calibration 4 Deep neural networks 4 Speech communication 4 Speech processing 4 Adaptive calibration 2 Alignment 2 Channel bottlenecks 2 Channel degradation 2 Channel degradations 2 Computational linguistics 2 Computationally efficient 2 Decision threshold 2 Deep neural network 2 Deep neural networks (DNNs) 2 Discriminative power 2 Feature normalization 2 Forecasting 2 Gaussian Mixture Model 2 Gaussian distribution 2 Language identification 2 Language recognition 2 Mismatch 2 Noise robustness 2 Score-level fusion 2 Senones 2 Speaker recognition 2 Speaker recognition system 2 Speech 2