Dynamic Echo Cancellation Window Adjustment for VoIP
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current echo cancellation techniques in VoIP systems face challenges with longer echo delays due to packet technology, requiring increased processing power and memory, and are limited by media gateways' capacity, especially in long-distance calls and wireless connections, which can lead to voice degradation.
Innovation Solution
A voice packet dynamic echo cancellation system that determines the round trip delay using RTP or Ethernet OAM mechanisms, allowing for a smaller echo cancellation window, reducing the need for extensive storage and processing power, and providing bidirectional echo cancellation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional echo cancellation techniques are used in VoIP systems, then echo cancellation is achieved, but processing power and memory requirements increase significantly due to longer echo delays
Solution Approach 1:
The patent implements dynamic adjustment of the echo cancellation window size based on actual network conditions and measured round trip delay. Instead of using a fixed large window, the system adapts the window size in real-time, making the echo cancellation process more efficient and reducing processing requirements while maintaining effectiveness.
Solution Approach 2:
The system changes the parameter of echo cancellation window size dynamically based on network performance metrics. By adjusting this critical parameter according to actual conditions, the system optimizes the balance between echo cancellation effectiveness and resource consumption.
2Device complexity
If media gateways with limited storage capacity are used, then device complexity is reduced, but echo cancellation capacity is limited due to restricted window size
Solution Approach 1:
The patent enables media gateways to dynamically adjust their echo cancellation window size based on actual network conditions. This dynamic capability allows simple devices with limited storage to adapt to varying echo delay scenarios, effectively increasing their echo cancellation capacity without adding physical complexity.
Solution Approach 2:
The system allows media gateways to change the echo cancellation window parameter based on measured network performance. This parameter adaptation enables limited-capacity devices to handle a broader range of echo scenarios by optimally allocating their available storage resources.
3Reliability
If larger echo cancellation windows are used to handle longer delays, then echo cancellation effectiveness improves, but memory requirements increase
Solution Approach 1:
The patent implements dynamic window sizing where the echo cancellation window expands or contracts based on the measured round trip delay. This dynamic approach ensures that memory is allocated efficiently - using only the necessary amount to handle the actual echo delay conditions rather than provisioning for maximum possible delays.
Solution Approach 2:
The system adjusts the echo cancellation window parameter based on actual network measurements. By changing this parameter dynamically, the system optimizes the trade-off between memory usage and echo cancellation effectiveness for the specific network conditions being experienced.
Data Source
AI summary
A voice packet dynamic echo cancellation system includes an input/output unit configured to communicate over a packet network and a storage unit configured to store network performance information associated with node segments on the packet network. The system also includes a processing unit configured to execute instructions to: set-up a call from an originating call device to a terminating call device; determine the network performance of the call between the originating call device and the terminating call device; locate an echo signal of the call to the originating call device based on the network performance; produce a echo cancellation signal based on the echo signal; cancel the echo signal with the echo cancellation signal; and recheck the network performance information during a duration of the call and adjust the specific delay point of the received signal window based on the network performance information.