Topic Detection in News Video and Audio is to automatically detect snippets with a topic the user searches for, in the news streams, including video,audio and broadcasting. It is a novel research scope rises along with the rapid development of multimedia technology, automatic speech recognition and natural language processing. This technology detects the topic of the news in the semantic level and fits for most people's retrieval need.
Keyword Spotting (KWS) or Keyword Recognition is to recognize a set of given keywords in continuous,spontaneous speech.It is a very active branch of Speech Recognition.It differs from Continuous Speech Recognition (CSR) in terms of research focus,implementation techniques and application background.So they are often regarded as two different issues.This paper gives an overview of basic techniques and advances in recent years,including how to combine the traits of Mandarin.
