Acoustic Echo Cancellation in Detachable Display Devices
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Solution Overview
Problem
In detachable display devices, the separation of the main System on Chip (SoC) and amplifier leads to delays in feedback signal transmission, preventing effective acoustic echo cancellation (AEC) processing.
Innovation Solution
The main processor in the display device performs AEC by using equalization and volume information to adjust and duplicate audio signals, allowing for direct processing without relying on feedback signals from amplifiers, and includes pre-processing amplifiers for synchronization through I2C communication standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the main SoC and amplifier are separated in detachable display devices, then device flexibility and modularity are improved, but feedback signal transmission delay increases preventing effective AEC processing
Solution Approach 1:
The patent applies preliminary action by having the main processor pre-process the audio signal (equalization and volume adjustment) before transmission to the amplifier. This allows the processor to generate a predicted feedback signal in advance, which is then used for AEC processing without waiting for the actual delayed feedback from the separated amplifier, thus resolving the time loss issue while maintaining device flexibility
2Reliability
If feedback signals are transmitted from the separated amplifier to the main SoC, then AEC processing can be performed, but transmission delay deteriorates AEC performance
Solution Approach 1:
The patent uses copying by creating a duplicate of the audio signal through pre-processing (equalization and volume adjustment) at the main processor. This copied signal serves as a substitute for the delayed feedback signal from the amplifier, enabling AEC processing to proceed with accurate timing without being constrained by the physical separation and transmission delays between components
3Measurement precision
If equalization and volume information are used for audio signal processing, then AEC accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing equalization and volume adjustment on the audio signal before transmission to the amplifier. The main processor stores the equalization information and volume information, and uses these pre-processed parameters to generate an accurate predicted feedback signal for AEC processing. This approach improves AEC accuracy while keeping processing complexity manageable by consolidating the additional processing steps in the main processor rather than adding complex hardware
Data Source
AI summary
A detachable display device includes a main box including a microphone and a main processor, and a display including an amplifier configured to amplify an audio signal received from the main processor and a speaker configured to convert the amplified audio signal into a sound and output the sound. The main processor is configured to perform acoustic echo cancellation (AEC) on the audio signal based on the audio signal output by the main processor, equalization information, and volume information.