Title :
A Speech Enhancement Approach for Live Teaching System Using a Novel Hybrid Double Talk Detector
Author :
Zheng, Qinghua ; Zhang, Weizhan ; Gong, Sha ; Yu, Yiqin ; Lv, Geli
Author_Institution :
Dept. of Comput. Sci., Xi´´an Jiaotong Univ.
Abstract :
Acoustic echo is a very trouble question in the live teaching system where teacher´s speech will be echoed in the classroom after a moment. This paper presents a speech enhancement framework shaping for live teaching system based on a novel hybrid double-talk detector (DTD). The proposed double-talk detection algorithm consists of two decision stages. First, double-talk is detected based on the classic energy-based approach. While a further judgment for silence situation is made in the second stage. If silence is announced, the microphone channel is shut down to reduce the bandwidth requirement. After simulation and experiment, it is found that not only the proposed approach is effective in enhancing the speech quality but also can it save the network bandwidth for e-learning system
Keywords :
acoustic signal processing; bandwidth compression; computer aided instruction; echo; microphones; multimedia communication; speech enhancement; speech recognition; teaching; voice communication; acoustic echo; double-talk detection algorithm; e-learning system; energy-based approach; live teaching system; microphone channel; network bandwidth reduction; speech quality enhancement approach; teacher speech echo; Acoustic signal detection; Bandwidth; Change detection algorithms; Detection algorithms; Detectors; Echo cancellers; Education; Filters; Microphones; Speech enhancement; Acoustic Echo Cancellation; Double-talk Detector; Live Teaching;
Conference_Titel :
Computer Supported Cooperative Work in Design, 2006. CSCWD '06. 10th International Conference on
Conference_Location :
Nanjing
Print_ISBN :
1-4244-0164-X
Electronic_ISBN :
1-4244-0165-8
DOI :
10.1109/CSCWD.2006.253232
