Improvement of packet loss concealment algorithm by both-side information utilization손실 전후 프레임 정보를 이용한 패킷손실은닉 알고리즘의 개선

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"Best effort" packet-switched networks, like the Internet, cannot offer a reliable transmission of real-time data such as voice and can lead to excessive packet losses under congestion. In real time packetized voice application, missing packets are the major source of voice quality degradation. Therefore, packet loss concealment (PLC) algorithms are needed to guarantee the QoS (Quality of Service) of VoIP (Voice over Internet Protocol). In this thesis, we describe a packet loss concealment scheme utilizing the next and previous good frames that follows and precedes lost packets, i.e., both-side information-based concealment. It is very natural to expect that this scheme should intuitively produce better concealment results than only the preceding frame information-based approach. The proposed concealment algorithm executes a phoneme comparison and both-side frame information-based waveform substitution to generate more suitable signal for the lost interval. In addition, it can be combined with other one-side PLC schemes such as the LP (Linear Prediction) based PLC algorithm, G.711 pitch waveform replication, recommended by ITU-T. Additional voice quality improvement is also obtained through this integration. Our proposed algorithm was evaluated by subjective quality test and compared with other PLC algorithms. According to the results, it provides more improved sound when the lost interval contains transition region or is too long to be concealed by utilizing only the preceding speech signal information.
Advisors
Hahn, Min-Sooresearcher한민수researcher
Description
한국정보통신대학원대학교 : 공학부,
Publisher
한국정보통신대학교
Issue Date
2003
Identifier
392204/225023 / 020013956
Language
eng
Description

학위논문(석사) - 한국정보통신대학원대학교 : 공학부, 2003, [ vii, 52 p. ]

Keywords

PLC; Packet Loss Concealment; VoIP; QoS; 서비스 품질; 은폐; 패킷손실은닉; 인터넷폰; Quality of Service

URI
http://hdl.handle.net/10203/55170
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=392204&flag=dissertation
Appears in Collection
School of Engineering-Theses_Master(공학부 석사논문)
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