Acoustic Echo Cancellation Using Jitter Buffer Lookahead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional voice communication systems face challenges with acoustic echo cancellation and delay jitter, particularly in packet-switch networks, which affect the quality of voice communication.
Innovation Solution
An audio processing apparatus incorporating an acoustic echo canceller and a jitter buffer, where the echo canceller is controlled by referencing future frames in the jitter buffer to enhance echo cancellation, including adjustments to convergence rate, step size, and filter taps based on signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acoustic echo cancellation is used without referencing future frames, then the system operates with lower complexity and no lookahead buffer is needed, but echo cancellation performance deteriorates due to inability to anticipate future signal characteristics
Solution Approach 1:
The jitter buffer stores future audio frames before they are needed for processing. By having these frames预先 available in the buffer, the acoustic echo canceller can reference future signal characteristics to adjust its parameters proactively, rather than reacting after the fact. This preliminary preparation of data enables better echo cancellation without requiring complex real-time prediction algorithms.
Solution Approach 2:
The jitter buffer acts as an intermediary component between the audio input stream and the acoustic echo canceller. It decouples the timing requirements, allowing the AEC to access audio frames at optimal times for analysis. This intermediary structure simplifies the overall system by providing a standardized interface while enabling sophisticated processing strategies.
2Reliability
If the acoustic echo canceller adjusts parameters dynamically based on future frame analysis, then echo suppression effectiveness improves, but processing time and computational load increase
Solution Approach 1:
The system performs parameter adjustment preparations in advance by analyzing future frames that are already stored in the jitter buffer. This preliminary analysis allows the acoustic echo canceller to have its parameters optimized before actual echo cancellation is needed, reducing the processing time during critical real-time operations while maintaining high effectiveness.
3Reliability
If a jitter buffer is introduced to reduce delay jitter, then voice communication quality improves, but system latency increases
Solution Approach 1:
The jitter buffer serves multiple functions simultaneously: it reduces delay jitter to improve voice quality, provides future frames for acoustic echo cancellation analysis, and enables dynamic parameter adjustment. By making this single component multi-functional, the system achieves multiple benefits without adding separate mechanisms that would further increase latency.
Data Source
AI summary
A method for controlling acoustic echo cancellation and an audio processing apparatus are described. In one embodiment, the audio processing apparatus includes an acoustic echo canceller for suppressing acoustic echo in a microphone signal, a jitter buffer for reducing delay jitter of a received signal, and a joint controller for controlling the acoustic echo canceller by referring to at least one future frame in the jitter buffer.