Adaptive Echo Cancellation Using Reverberation-Time Filter Length
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Solution Overview
Problem
Existing echo cancellation solutions face challenges with varying echo transfer function lengths in different call scenarios, leading to high resource wastage or poor cancellation effects due to fixed filter lengths that do not adapt to changing speech scenarios.
Innovation Solution
Determine a global reverberation time based on reverberation features of a speech signal using a preset mapping relationship, adjust the echo transfer function's length accordingly, and eliminate echoes dynamically to match actual needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed-length echo transfer function is used in all call scenarios, then device complexity is reduced and ease of operation is improved, but echo cancellation effectiveness deteriorates and resource utilization becomes inefficient
Solution Approach 1:
The patent implements dynamic adjustment of the echo transfer function length based on real-time reverberation time estimation. The system continuously monitors the speech signal to estimate reverberation time and adapts the filter length accordingly, transitioning from a static fixed-length approach to a dynamic adaptive approach that optimizes echo cancellation for varying acoustic environments
Solution Approach 2:
The patent changes the parameter of echo transfer function length based on estimated reverberation time. By establishing a mapping relationship between reverberation time and optimal filter length, the system adjusts the filter length parameter dynamically to match the acoustic characteristics of the current call scenario, thereby improving cancellation effectiveness without sacrificing operational simplicity
2Reliability
If the echo transfer function length is increased to improve echo cancellation in highly reverberant scenarios, then echo cancellation effectiveness is improved, but resource consumption increases and processing efficiency decreases
Solution Approach 1:
The system dynamically adjusts the echo transfer function length based on real-time reverberation time estimation rather than using a consistently long filter. This dynamic adaptation allows the system to use shorter filters in low-reverberation scenarios (improving processing efficiency) while switching to longer filters only when high reverberation is detected (maintaining cancellation effectiveness)
Solution Approach 2:
The patent establishes a mapping relationship between reverberation time and echo transfer function length, enabling the system to optimize the filter length parameter according to the actual acoustic environment. This parameter adaptation ensures that computational resources are allocated efficiently - using minimal processing power when possible while maintaining adequate echo cancellation performance
3Productivity
If the echo transfer function length is decreased to reduce resource consumption, then resource efficiency is improved and processing speed increases, but echo cancellation effectiveness deteriorates in reverberant environments
Solution Approach 1:
The system employs dynamic adjustment of filter length based on real-time reverberation time estimation. Rather than using a short fixed-length filter that would consistently underperform in reverberant environments, the system adapts the filter length upward when high reverberation is detected, ensuring adequate echo cancellation effectiveness while maintaining processing efficiency in non-reverberant conditions
Solution Approach 2:
The patent changes the echo transfer function length parameter based on the estimated reverberation time of the current call scenario. By establishing an appropriate mapping between reverberation time and filter length, the system ensures that the filter length is sufficient for the acoustic conditions, thereby maintaining cancellation effectiveness without unnecessarily increasing processing requirements
4Reliability
If different echo transfer function lengths are used for different call scenarios, then echo cancellation effectiveness is improved, but device complexity increases and system management becomes more difficult
Solution Approach 1:
The patent implements a dynamic adaptation mechanism that automatically adjusts the echo transfer function length based on real-time reverberation time estimation from the speech signal. This dynamic approach eliminates the need for manual configuration or complex scene classification logic, as the system self-adapts to different call scenarios through continuous acoustic environment monitoring and automatic parameter adjustment
Solution Approach 2:
The system performs self-adjustment of the echo transfer function length by automatically estimating reverberation time from the incoming speech signal and selecting the appropriate filter length based on the estimated characteristics. This self-service mechanism eliminates the need for external control or complex system management, as the echo cancellation system autonomously optimizes its parameters according to the acoustic environment
Data Source
AI summary
An echo cancellation method and apparatus, a device, and a storage medium, are provided. The echo cancellation method includes: obtaining a plurality of reverberation features of a first target speech signal, where the plurality of reverberation features are signal features related to reverberation times; respectively determining, according to each reverberation feature of the first target speech signal and a preset mapping relationship between the reverberation feature and a reverberation time estimate, the reverberation time estimate corresponding to each reverberation feature of the first target speech signal; determining a global reverberation time of the first target speech signal according to reverberation time estimates respectively corresponding to a plurality of reverberation features of the first target speech signal; adjusting a length of an echo transfer function according to the global reverberation time; and eliminating an echo of the first target speech signal according to the adjusted length of the echo transfer function.