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Technology Forum |
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Design and Analysis of Echo Canceller on Embedded System
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Abstract |
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In hands-free mode, the signal radiated from the loudspeaker will be
picked up by the microphone, which produces echoes, will disturb users. Due to
the evolution of the integrated circuit, echo cancellation based on adaptive
filter is publicly employed. On embedded system, the resource, for example, CPU
and memory, is limited. It is an important issue that how to used resource
efficiently. This text will introduce the principles and implementation of echo
canceller, and the tradeoff between the performance and the cost. |
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Author: Kuo-Huang Chung |
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3GPP IMS Messaging Service Technology
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Abstract |
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The future Telecom networks 3G/B3G/NGN, whether wireless core
networks or wired broadband networks, will converge to an All-IP Network. Its
core network IP Multimedia Subsystem leverages SIP technology as the
communication signaling protocol between heterogeneous networks for
call/session control and between S-CSCF and Application Server for offering
real-time communication service, e.g. voice/video, presence, and instant
messaging service, etc. 3GPP is working on IMS-based messaging service
specification based on SIP/SIMPLE technology, specifying the service
requirement, architecture, functionality and implementation. This article is to
introduce the technologies and related services on the 3GPP IMS-based messaging
service. |
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Author: Che-Shiun Ho、Wan-Wan
Shen 、Hui-Ru Shen |
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