Audio Signal Combining for Adaptive Multi-Speaker Echo Cancellation
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Solution Overview
Problem
Existing audio systems with multiple speakers face challenges in managing echo cancellation effectively, particularly due to unpredictable transfer functions caused by speaker orientation and position, which affect the amplifier settings and echo cancellation algorithms.
Innovation Solution
An audio system with integrated circuits that include amplifiers and combiners, capable of adjusting settings based on speaker orientation and position, and utilizing delay lines and filters to compensate for latency, while combining audio signals to reduce the number of inputs for echo cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple speakers are used to enhance audio output, then audio quality and user experience are improved, but echo cancellation becomes more difficult to manage due to unpredictable transfer functions
Solution Approach 1:
The patent divides the echo cancellation task into separate processing stages: a combiner that aggregates signals from multiple speakers into a reduced set of representative signals, and separate echo cancellation processing for each speaker channel. This segmentation allows the system to handle multiple speakers without proportionally increasing the complexity of echo cancellation processing, as the combiner reduces the signal dimensionality before processing.
Solution Approach 2:
The combiner acts as an intermediary component between the multiple speaker outputs and the echo cancellation processor. It receives amplified audio signals from multiple speakers and transforms them into a reduced number of combined signals, serving as a mediator that simplifies the interface between the multi-speaker system and the echo cancellation algorithm, thereby reducing processing complexity while maintaining audio quality.
2Adaptability or versatility
If amplifier settings are adjusted for different speaker orientations, then audio performance is optimized, but the transfer function becomes unpredictable
Solution Approach 1:
The patent implements dynamic adjustment of amplifier settings based on detected speaker orientation. The system continuously monitors the operational state of speakers and modifies amplifier parameters in real-time to optimize audio performance for different orientations. This dynamic adaptation allows the system to maintain reliable transfer functions across varying conditions by adjusting settings proactively rather than using fixed parameters.
Solution Approach 2:
The system employs feedback mechanisms to monitor speaker performance and orientation, using this information to adjust amplifier settings. By continuously measuring the actual audio output and comparing it with expected transfer characteristics, the system can compensate for orientation variations and maintain predictable transfer functions despite changes in speaker positioning or orientation.
3Measurement precision
If echo cancellation algorithms process signals from multiple speakers, then cancellation accuracy is improved, but processing time and computational load increase
Solution Approach 1:
The patent merges the signals from multiple speakers into a reduced set of combined signals through the combiner before they are processed by the echo cancellation algorithm. This merging operation consolidates redundant information across speaker channels, allowing the echo cancellation processor to work with fewer independent signals. The result is maintained cancellation accuracy across all speaker channels while significantly reducing the computational load and processing time required.
Data Source
AI summary
In an example, an audio system, which may comprise an integrated circuit, comprises an amplifier and a combiner. The amplifier is configured to output a first amplified audio signal to a speaker. The combiner is configured to: receive the first amplified audio signal from the amplifier, receive a second audio signal, combine the first amplified audio signal and second audio signal into a combined signal, and output the combined signal.