Anti-voice Interference Filtering for Electronic Devices
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Solution Overview
Problem
Voice commands in electronic devices are often interfered with by background noises, such as audio playing on the target device, leading to ineffective control.
Innovation Solution
An anti-voice interference filtering system that acquires and filters audio signals to isolate user voice signals from background noise, using a comparison module to calculate a time difference and sound amplification parameter, and then modifies the background noise signal to compensate for these differences, synthesizing the signals to produce a noise-filtered audio input for voice recognition systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voice control is implemented in electronic devices, then user convenience is improved, but voice recognition accuracy deteriorates due to background noise interference
Solution Approach 1:
The patent captures the background noise (harmful factor) through the audio output unit, processes it to extract interference characteristics, and uses these characteristics to subtract the noise from the original audio signal. This converts the harmful background noise into useful information for noise cancellation, thereby improving voice recognition accuracy while maintaining voice control convenience
Solution Approach 2:
The patent introduces an audio output unit as an intermediary component that captures the background noise signal. This intermediary serves as a reference source that allows the system to identify and remove interference from the voice signal without requiring additional microphones or complex hardware modifications
2Device complexity
If traditional control methods are used, then device complexity is reduced, but user convenience deteriorates
Solution Approach 1:
The audio output unit serves multiple functions: it is used for normal audio playback and simultaneously serves as a reference microphone for capturing background noise. This multi-functionality allows the system to implement noise cancellation without adding dedicated hardware components, maintaining device simplicity while improving user convenience through voice control
Data Source
AI summary
An interference filtering method applied to the voice commands of a user of a device includes audio acquisition unit of device taking a first audio signal including user voice from the environment and a second audio signal from an audio output unit of a device creating competing noise. A first background audio signal is obtained by filtering a speech sound region in first audio signal, and a second background audio signal is obtained by filtering a speech sound region in second audio signal. A time difference T and a sound amplified parameter X are obtained by comparison. A third audio signal is obtained by performing time compensation, amplification, and an inverting operation on second audio signal. First audio signal and third audio signal are synthesized to produce fourth audio signal for feeding to voice recognition unit of the original user device.