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语音中的声学规律：从词到段Finding Acoustic Regularities in Speech: From Words to Segments |
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| 课程网址: | http://videolectures.net/clsp_glass_regularities/ |
| 主讲教师: | Jim Glass |
| 开课单位: | 麻省理工学院 |
| 开课时间: | 信息不详。欢迎您在右侧留言补充。 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | The development of an automatic speech recognizer is typically a highly supervised process involving the specification of phonetic inventories, lexicons, acoustic and language models, along with annotated training corpora. Although some model parameters may be modified via adaptation, the overall structure of the speech recognizer remains relatively static thereafter. While this approach has been effective for problems when there is adequate human expertise and labeled corpora, it is challenged by less-supervised or unsupervised scenarios. It also stands in stark contrast to human processing of speech and language where learning is an intrinsic capability. From a machine learning perspective, a complementary alternative is to discover unit inventories in an unsupervised manner by exploiting the structure of repeating acoustic patterns within the speech signal. In this work we use pattern discovery methods to automatically acquire lexical entities, as well as speaker and topic segmentations directly from an untranscribed audio stream. Our approach to unsupervised word acquisition utilizes a segmental variant of a widely used dynamic programming technique, which allows us to find matching acoustic patterns between spoken utterances. By aggregating information about these matching patterns across audio streams, we demonstrate how to group similar acoustic sequences together to form clusters corresponding to lexical entities such as words and short multi-word phrases. On a corpus of lecture material, we demonstrate that clusters found using this technique exhibit high purity and that many of the corresponding lexical identities are relevant to the underlying audio stream. We have applied the acoustic pattern matching and clustering methods to several important problems in speech and language processing. In addition to showing how this methodology applies across different languages, we demonstrate two methods to automatically determine the identify of speech clusters. Finally, we also show how it can be used to provide an unsupervised segmentation of speakers and topics. Joint work with Alex Park, Igor Malioutov, and Regina Barzilay. |
| 关 键 词: | 自动语音识别; 动态编程技术; 声学模式匹配; 聚类方法 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2019-11-17：cwx |
| 阅读次数: | 19 |