Speaker Echo Cancellation Using Filtered Inverted-Phase Output
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Solution Overview
Problem
Electronic devices face challenges in effectively canceling echo components due to increased signal output and structural changes, such as slimness, which can distort echo signals, leading to poor audio quality and deteriorated voice recognition performance.
Innovation Solution
The electronic device outputs an inverted phase signal corresponding to the audio signal through an auxiliary output unit to cancel echo components, and filters this signal based on external environment parameters to improve echo cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of signal output through speaker is increased, then audio output quality is improved, but echo component flowing into microphone increases
Solution Approach 1:
The system generates an anti-echo signal by inverting the phase of the speaker output signal before it can be picked up by the microphone. This preliminary counter-action cancels the echo component when the inverted signal and original echo combine at the microphone, allowing high output power without proportional increase in echo interference.
Solution Approach 2:
The system takes the harmful echo signal that would normally degrade audio quality and converts it into a beneficial anti-echo signal through phase inversion. The inverted signal, when combined with the original echo at the microphone, produces destructive interference that eliminates the harmful echo component while preserving the desired audio output.
2Volume of moving object
If electronic device structure is changed for slimness, then device portability is improved, but echo signal distortion increases
Solution Approach 1:
The system dynamically adapts the anti-echo signal generation process to compensate for structural constraints. By continuously monitoring the speaker output and generating real-time inverted signals, the system maintains effective echo cancellation despite the fixed slim structure that causes signal distortion.
Solution Approach 2:
The system changes the phase parameter of the speaker signal by inverting it to create the anti-echo signal. This parameter transformation allows the system to counteract the distortion effects caused by the slim device structure, maintaining signal accuracy without requiring structural changes.
3Reliability
If AEC is used to cancel echo, then audio quality is improved, but clipped or distorted echo components cannot be cancelled
Solution Approach 1:
The system performs preliminary phase inversion of the speaker signal to generate the anti-echo signal before the echo reaches the microphone. This advance preparation ensures that even clipped or distorted echo components have their corresponding inverted signals ready for cancellation, improving the system's ability to handle non-ideal echo conditions.
Solution Approach 2:
The system uses feedback from the speaker output signal to continuously generate updated anti-echo signals. This feedback mechanism ensures that the inverted signal remains synchronized with the actual speaker output, maintaining effective echo cancellation even when echo components are clipped or distorted by environmental factors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces echo components entering the microphone, enhancing audio quality and voice recognition accuracy by accounting for environmental noise and signal distortions.
Implementation Method 1
output, through an auxiliary output unit, an inverted phase signal corresponding to an audio signal output through a main output unit, thereby cancelling an echo component
Data Source
AI summary
The present disclosure relates to an apparatus and a method for cancelling echo by an electronic device. Here, a method of operating an electronic device includes converting a first digital signal related to a sound to be output through a plurality of speakers into a first analog signal; outputting the converted first analog signal as a sound using at least a part of the plurality of speakers; filtering at least a part of the converted first analog signal and/or the output sound and then generating a second analog signal; and outputting the second analog signal as another sound using at least another part of the plurality of speakers.