Improving the Robustness of the G.722 Wideband Speech Codec to Packet Losses for Voice Over Wlans

Author

Shetty, Niranjan ; Gibson, Jerry D.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA

Volume

5

fYear

2006

fDate

14-19 May 2006

Abstract

Since the G.722 wideband speech codec offers higher quality and naturalness than G.711, is low in complexity, has low delay, and tandems well with other codecs, it is an attractive codec for voice over IP and voice over wireless LANs. However, packet losses in G.722 not only require good concealment of the lost frame, but a lost frame results in a mismatch of the encoder/decoder states for the next correctly received frame following the lost frame. Although proprietary schemes exist, the G.722 codec has no standardized packet loss concealment (PLC) method. We present a new PLC method for G.722 and propose an efficient approach to sending the side information to resynchronize the encoder and decoder that greatly improves the robustness of the G.722 codec to packet losses

Keywords

Internet telephony; decoding; speech codecs; speech coding; wireless LAN; G.722 wideband speech codec; encoder-decoder states; packet loss concealment method; packet losses; voice over IP; voice over WLAN; wireless local area network; Decoding; Delay; Internet telephony; Programmable control; Pulse modulation; Robustness; Speech codecs; Speech coding; Wideband; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on

Conference_Location

Toulouse

ISSN

1520-6149

Print_ISBN

1-4244-0469-X

Type

conf

DOI

10.1109/ICASSP.2006.1661288

Filename

1661288