图 书 馆
概率振幅和频率解调Probabilistic amplitude and frequency demodulation |
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| 课程网址: | http://videolectures.net/nips2011_turner_amplitude/ |
| 主讲教师: | Richard Turner |
| 开课单位: | 伦敦大学学院 |
| 开课时间: | 2012-09-06 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | A number of recent scientific and engineering problems require signals to be decomposed into a product of a slowly varying positive envelope and a quickly varying carrier whose instantaneous frequency also varies slowly over time. Although signal processing provides algorithms for so-called amplitude- and frequency-demodulation (AFD), there are well known problems with all of the existing methods. Motivated by the fact that AFD is ill-posed, we approach the problem using probabilistic inference. The new approach, called probabilistic amplitude and frequency demodulation (PAFD), models instantaneous frequency using an auto-regressive generalization of the von Mises distribution, and the envelopes using Gaussian auto-regressive dynamics with a positivity constraint. A novel form of expectation propagation is used for inference. We demonstrate that although PAFD is computationally demanding, it outperforms previous approaches on synthetic and real signals in clean, noisy and missing data settings. |
| 关 键 词: | 瞬时频率; 振幅; 频率解调; 用概率推理问题 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-06-08：wuyq |
| 阅读次数: | 28 |