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Prosody is a rich information source in natural language, serving as a marker for phenomena such as contrast. In order to make this information available to downstream tasks, we need away to detect prosodic events in speech. We propose a new model for pitch accent detection, inspired by the work of Stehwien et al. (2018), who presented a CNN-based model for this task. Our model makes greater use of context by using full utterances as input and adding an LSTM layer. We find that these innovations lead to an improvement from 87.5 percent to 88.7 percent accuracy on pitch accent detection on American English speech in the Boston University Radio News Corpus, a state-of-the-art result. We also find that a simple baseline that just predicts a pitch accent on every content word yields 82.2 percent accuracy, and we suggest that this is the appropriate baseline for this task. Finally, we conduct ablation tests that show pitch is the most important acoustic feature for this task and this corpus.
|Title of host publication||Proceedings of the Conference on Empirical Methods in Natural Language Processing (EMNLP 2020)|
|Number of pages||7|
|Publication status||Accepted/In press - 18 Sep 2020|
|Event||The 2020 Conference on Empirical Methods in Natural Language Processing - Virtual conference|
Duration: 16 Nov 2020 → 20 Nov 2020
|Conference||The 2020 Conference on Empirical Methods in Natural Language Processing|
|Abbreviated title||EMNLP 2020|
|Period||16/11/20 → 20/11/20|
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1/08/17 → 31/01/23