Virtual Duplex Audio Bandwidth Segmentation for Double-Talk Echo Cancellation
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Solution Overview
Problem
Existing audio communication systems face challenges in maintaining full-duplex operation during adverse conditions like double-talk situations, especially in virtual reality recording environments where echo cancellation is difficult due to acoustic coupling, leading to reduced speech intelligibility and naturalness.
Innovation Solution
The system splits the speech bandwidth into sub-bands and dynamically adjusts the frequency range based on speech activity and echo levels, using band-pass and band-stop filters to prioritize mid-frequency ranges for intelligibility and reduce high-frequency noise, allowing for virtual full-duplex communication even in harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full bandwidth transmission is used during double-talk, then speech intelligibility is maintained, but echo cancellation becomes ineffective and speech naturalness deteriorates
Solution Approach 1:
The patent segments the frequency bandwidth into multiple sub-bands (e.g., first sub-band, second sub-band, third sub-band) and applies different transmission strategies to each sub-band during double-talk conditions. This allows selective maintenance of speech intelligibility in certain sub-bands while enabling echo cancellation in others, resolving the contradiction between maintaining intelligibility and ensuring echo cancellation effectiveness.
2Reliability
If bandwidth is reduced to sub-bands during double-talk, then echo cancellation effectiveness improves, but speech naturalness is compromised
Solution Approach 1:
The patent applies local quality by transmitting full bandwidth in sub-bands that are less susceptible to echo interference (e.g., third sub-band) while reducing bandwidth in sub-bands where echo cancellation is more effective. This selective approach preserves speech naturalness in regions where it matters most while maintaining echo cancellation effectiveness where it can be achieved, thus resolving the contradiction between these two objectives.
3Adaptability or versatility
If dynamic bandwidth adjustment is implemented, then adaptability to double-talk conditions improves, but system complexity increases
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by continuously monitoring double-talk detection signals and automatically adjusting the bandwidth allocation across different sub-bands in real-time. The system transitions between full bandwidth transmission and reduced sub-band transmission based on current acoustic conditions, providing high adaptability to varying double-talk scenarios while managing complexity through automated control algorithms.
Data Source
AI summary
A method including, while first audio signals from a first user are being transmitted on a first bandwidth from a first apparatus, detecting transmitting of second audio signals from a second user by a second apparatus; and based upon the detecting of the second audio signals from the second apparatus, reducing the transmitting of the first audio signals on the first bandwidth to transmitting of the first audio signals on at least one first relatively smaller sub-band of the first bandwidth.