The Study of the Effectness of Packet Losses on CELP Codec
碩士 === 國立暨南國際大學 === 資訊工程學系 === 89 === The main topic in this thesis is to investigate the effectness of speech communication quality when any packet loss occurs in a network system. Furthermore, a feasible method to reconstruct the lost speech information containing in the lost packets is...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | zh-TW |
Published: |
2001
|
Online Access: | http://ndltd.ncl.edu.tw/handle/36349005245949561185 |
id |
ndltd-TW-089NCNU0392008 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-089NCNU03920082016-01-29T04:27:56Z http://ndltd.ncl.edu.tw/handle/36349005245949561185 The Study of the Effectness of Packet Losses on CELP Codec 封包遺失對CELP編解碼器影響之研究 Hsien-Jone Hsieh 謝憲忠 碩士 國立暨南國際大學 資訊工程學系 89 The main topic in this thesis is to investigate the effectness of speech communication quality when any packet loss occurs in a network system. Furthermore, a feasible method to reconstruct the lost speech information containing in the lost packets is presented. The codec, which is designed follows the standard FS1016 4.8kbps is implemented in order to study the quality of speech communication over a network. A code excited linear prediction (CELP) codec is implemented according to the specification of the standard. Based on this implemented codec, we not only study the quality of speech communication on networks of various packet loss rates, but also present a new method to reconstruct the speech information contained in the lost packets. The speech information is reconstructed via recalculating the parameters of speech frame originally stored in the lost packets. In order to have a better quality after reconstruction, one may extract some information from a given speech frame and preserve this information in preceding speech frame and successive speech frame of the given frame; however, this method will unavoidably increase the bit rate of codec. In order not to increase the bit rate of the codec, a new method of reconstruction of the speech information is proposed in this thesis. By computer simulations, this new method results in an acceptable speech quality, but does not increase the bit rate of the codec. Yunghsiang Sam Ham Dyi-Rong Duh 韓永祥 杜迪榕 2001 學位論文 ; thesis 38 zh-TW |
collection |
NDLTD |
language |
zh-TW |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 國立暨南國際大學 === 資訊工程學系 === 89 === The main topic in this thesis is to investigate the effectness of speech communication quality when any packet loss occurs in a network system. Furthermore, a feasible method to reconstruct the lost speech information containing in the lost packets is presented. The codec, which is designed follows the standard FS1016 4.8kbps is implemented in order to study the quality of speech communication over a network. A code excited linear prediction (CELP) codec is implemented according to the specification of the standard. Based on this implemented codec, we not only study the quality of speech communication on networks of various packet loss rates, but also present a new method to reconstruct the speech information contained in the lost packets. The speech information is reconstructed via recalculating the parameters of speech frame originally stored in the lost packets. In order to have a better quality after reconstruction, one may extract some information from a given speech frame and preserve this information in preceding speech frame and successive speech frame of the given frame; however, this method will unavoidably increase the bit rate of codec. In order not to increase the bit rate of the codec, a new method of reconstruction of the speech information is proposed in this thesis. By computer simulations, this new method results in an acceptable speech quality, but does not increase the bit rate of the codec.
|
author2 |
Yunghsiang Sam Ham |
author_facet |
Yunghsiang Sam Ham Hsien-Jone Hsieh 謝憲忠 |
author |
Hsien-Jone Hsieh 謝憲忠 |
spellingShingle |
Hsien-Jone Hsieh 謝憲忠 The Study of the Effectness of Packet Losses on CELP Codec |
author_sort |
Hsien-Jone Hsieh |
title |
The Study of the Effectness of Packet Losses on CELP Codec |
title_short |
The Study of the Effectness of Packet Losses on CELP Codec |
title_full |
The Study of the Effectness of Packet Losses on CELP Codec |
title_fullStr |
The Study of the Effectness of Packet Losses on CELP Codec |
title_full_unstemmed |
The Study of the Effectness of Packet Losses on CELP Codec |
title_sort |
study of the effectness of packet losses on celp codec |
publishDate |
2001 |
url |
http://ndltd.ncl.edu.tw/handle/36349005245949561185 |
work_keys_str_mv |
AT hsienjonehsieh thestudyoftheeffectnessofpacketlossesoncelpcodec AT xièxiànzhōng thestudyoftheeffectnessofpacketlossesoncelpcodec AT hsienjonehsieh fēngbāoyíshīduìcelpbiānjiěmǎqìyǐngxiǎngzhīyánjiū AT xièxiànzhōng fēngbāoyíshīduìcelpbiānjiěmǎqìyǐngxiǎngzhīyánjiū AT hsienjonehsieh studyoftheeffectnessofpacketlossesoncelpcodec AT xièxiànzhōng studyoftheeffectnessofpacketlossesoncelpcodec |
_version_ |
1718170537875734528 |