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One successful example is presented by Siniscalchi et al.[6], one of the best results reported on the phone TIMIT recognition task, where 15 broad articulatory classes are used to predict posterior phone probabilities and to rescore phone lattices.
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As expected, a combination of broad-class posteriors with phone posteriors can be effective for enhancing both the correctness and accuracy rates in phone recognition.
The serial arrangement proposed provides several broad-class posteriors along with the phone posteriors.
The goal of a combination approach is to take advantage of the broad-class posteriors along with the phone posteriors in order to improve the global phone recognition performance.
State-level phone posterior probabilities are employed as features for the query and the utterance representation.
The HMM baseline system employed discriminative training, neural-network-derived phone posterior probability features, as well as ensemble acoustic models, etc.
The field of acoustic modeling for ASR has seen a lot of research on the usage of neural networks that are able to estimate phone posterior distributions.
The DTW algorithm is used for query detection from the state-level phone posterior probabilities that represent each query and utterance frame.
In that case, the speech features were either the estimated phone posterior probabilities (usually decorrelated and with a reduced dimensionality (tandem)) or the activations of a narrow hidden layer (bottleneck).
The global phone posteriors are found by combining the corresponding outputs of all output layers.
Results of only speech/music discrimination: 98.0% Ajmera et al., 2003 [14] Automatic transcription of broadcast news Averaged entropy measure and "dynamism" estimated at the output of a multilayer perceptron (MLP) trained to emit posterior probabilities of phones.
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