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Báo cáo toán học: " System for fast lexical and phonetic spoken term detection in a Czech cultural heritage archive"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: System for fast lexical and phonetic spoken term detection in a Czech cultural heritage archive | Psutka et al. EURASIP Journal on Audio Speech and Music Processing 2011 2011 10 http asmp.eurasipjournals.eom content 2011 1 10 D EURASIP Journal on Audio Speech and Music Processing a SpringerOpen Journal RESEARCH Open Access System for fast lexical and phonetic spoken term detection in a Czech cultural heritage archive Josef Psutka Jan Svec Josef V Psutka Jan Vanek Ales Prazak Lubos Smfdl and Pavel Ircing Abstract The main objective of the work presented in this paper was to develop a complete system that would accomplish the original visions of the MALACH project. Those goals were to employ automatic speech recognition and information retrieval techniques to provide improved access to the large video archive containing recorded testimonies of the Holocaust survivors. The system has been so far developed for the Czech part of the archive only. It takes advantage of the state-of-the-art speech recognition system tailored to the challenging properties of the recordings in the archive elderly speakers spontaneous speech and emotionally loaded content and its close coupling with the actual search engine. The design of the algorithm adopting the spoken term detection approach is focused on the speed of the retrieval. The resulting system is able to search through the 1 000 h of video constituting the Czech portion of the archive and find query word occurrences in the matter of seconds. The phonetic search implemented alongside the search based on the lexicon words allows to find even the words outside the ASR system lexicon such as names geographic locations or Jewish slang. 1 Introduction The whole story of the cultural heritage archive that is in focus of our research and development effort began in 1994 when after releasing Schindler s List Steven Spielberg was approached by many survivors who wanted him to listen to their stories of the Holocaust. Inspired by these requests Spielberg decided to start the Survivors of the Shoah Visual History Foundation VHF so that