Online Speech Detection and Dual-Gender Speech Recognition for Captioning Broadcast News

• IMAI Toru

  NHK Science and Technical Research Laboratories

• SATO Shoei

  NHK Science and Technical Research Laboratories

• HOMMA Shinichi

  NHK Science and Technical Research Laboratories

• ONOE Kazuo

  NHK Science and Technical Research Laboratories

• KOBAYASHI Akio

  NHK Science and Technical Research Laboratories

抄録

This paper describes a new method to detect speech segments online with identifying gender attributes for efficient dual gender-dependent speech recognition and broadcast news captioning. The proposed online speech detection performs dual-gender phoneme recognition and detects a start-point and an end-point based on the ratio between the cumulative phoneme likelihood and the cumulative non-speech likelihood with a very small delay from the audio input. Obtaining the speech segments, the phoneme recognizer also identifies gender attributes with high discrimination in order to guide the subsequent dual-gender continuous speech recognizer efficiently. As soon as the start-point is detected, the continuous speech recognizer with paralleled gender-dependent acoustic models starts a search and allows search transitions between male and female in a speech segment based on the gender attributes. Speech recognition experiments on conversational commentaries and field reporting from Japanese broadcast news showed that the proposed speech detection method was effective in reducing the false rejection rate from 4.6% to 0.53% and also recognition errors in comparison with a conventional method using adaptive energy thresholds. It was also effective in identifying the gender attributes, whose correct rate was 99.7% of words. With the new speech detection and the gender identification, the proposed dual-gender speech recognition significantly reduced the word error rate by 11.2% relative to a conventional gender-independent system, while keeping the computational cost feasible for real-time operation.

収録刊行物

• IEICE transactions on information and systems

  IEICE transactions on information and systems 90 (8), 1286-1291, 2007-08-01

  一般社団法人電子情報通信学会

キーワード

• speech recognition
• speech detection
• gender identification
• low latency
• broadcast captioning

詳細情報

• CRID: 1573105977404983424
• NII論文ID: 110007538655
• NII書誌ID: AA10826272
• ISSN: 09168532
• 本文言語コード: en
• データソース種別:
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