Suitable packetization interval for using Constrained Energy Lapped Transform (CELT) CODEC in bi-directional communication over WLAN 802.11g
Conference proceedings article
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
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รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Lavangnananda K., Yongsakun K., Bouvry P.
ผู้เผยแพร่: Hindawi
ปีที่เผยแพร่ (ค.ศ.): 2011
หน้าแรก: 536
หน้าสุดท้าย: 541
จำนวนหน้า: 6
ISBN: 9781457703881
นอก: 0146-9428
eISSN: 1745-4557
ภาษา: English-Great Britain (EN-GB)
บทคัดย่อ
Full audio bandwidth with very low algorithmic delay CODEC is state-of-the-art in CODEC technology. This type of CODEC is expected to support full frequency range for human hearing. It will enable future multipurpose audio applications, especially those which require high quality of audio signal with very low delay. A popular choice for this type of CODEC is the Constrained Energy Lapped Transform (CELT) CODEC since it is an open source and royalty free. This study is concerned with the effect of packetization interval for using CELT CODEC in bidirectional communication over WLAN 802.11g with respect to packet loss and end-to-end delay. Possible bitrates used in CELT were also investigated. The result reveals that the commonly default 20 ms. packetization interval is not always suitable for all network conditions. High packetization interval (more than 60ms) interval are not recommended as packet loss can be quite high and end-to-end delay can exceed the 150 ms. ITU recommended value. Using packetization interval at 30 ms. is recommended, apart from achieving better performance, it allows CODEC bitrate to be varied while packet loss is still acceptable and end-to-end delay is still within the recommended value. A practical application for this study is a synchronous remote music session practice between two persons. ฉ 2011 IEEE.
คำสำคัญ
Bitrate, CODEC, Constrained Energy Lapped Transform (CELT), End-to-end delay, Packetization interval, Packet Loss, WLAN 802.11g
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