Echo Cancellation Using Grouped Impulse Response Segmentation
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Solution Overview
Problem
Existing communication systems face high hardware costs and inefficiencies in echo signal cancellation due to the need for numerous taps in digital filters, which are required to effectively remove echo signals with complex responses.
Innovation Solution
The proposed echo processing apparatus generates echo cancellation signals by utilizing a combination of signal processing circuits and delay circuits that dynamically adjust delay times to sum up echo estimation signals corresponding to different responses, allowing for fewer taps to achieve effective echo cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digital filter with more taps is used to remove echo signal more effectively, then echo cancellation performance is improved, but hardware cost increases due to larger circuit area required for each additional tap
Solution Approach 1:
The patent divides the echo cancellation task into multiple segments by separating the impulse response into multiple groups. Each group is processed by a dedicated signal processing circuit, allowing the system to handle complex echo responses with fewer total taps distributed across multiple specialized circuits rather than one large filter
Solution Approach 2:
The patent introduces a time dimension by processing different groups of impulse response at different time intervals. This allows the system to achieve effective echo cancellation across a longer time range without proportionally increasing the number of taps in each circuit, thereby reducing overall hardware complexity
2Object-generated harmful factors
If a digital filter with more taps is used to remove echo signal more effectively, then echo signal removal effectiveness is improved, but circuit area increases
Solution Approach 1:
The echo cancellation system is segmented into multiple signal processing circuits, each handling a specific group of the impulse response. This segmentation allows the total circuit area to be distributed across multiple smaller units rather than requiring one large circuit, while maintaining effective echo signal removal through coordinated processing of all groups
Solution Approach 2:
Each signal processing circuit processes only a partial portion of the total impulse response (one group at a time), rather than requiring every circuit to handle the complete response. This partial action approach reduces the circuit area required per unit while achieving complete echo cancellation through the combined output of multiple circuits
Data Source
AI summary
An echo signal processing apparatus is disclosed. The echo signal processing apparatus is utilized for generating a cancellation signal by using group phenomenon of a frequency response of an echo signal to remove the echo signal. The echo signal processing apparatus has lower cost and is able to remove the echo efficiently.