Audio Cancellation Calibration for Wireless Voice Recognition
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Solution Overview
Problem
Existing voice-enabled devices struggle to accurately cancel ambient audio, including currently-playing audio, to enhance voice command recognition, particularly when using wireless connections like Bluetooth, which introduces significant delays and variations in synchronization.
Innovation Solution
A calibration process is implemented to detect and measure the delay between audio generation and recording, using an audio cue to adjust the cancellation method, ensuring accurate synchronization and effective cancellation of ambient audio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless connections like Bluetooth are used to connect audio output devices, then ease of operation and connectivity flexibility are improved, but synchronization accuracy and timing precision deteriorate due to significant delays and variations
Solution Approach 1:
The system performs a calibration process before actual audio playback to measure and store the time delay between audio generation and playback. This preliminary measurement allows the system to compensate for wireless connection delays in subsequent operations, resolving the contradiction between ease of wireless connection and synchronization accuracy.
Solution Approach 2:
The system continuously monitors the time delay between audio generation and playback through the wireless connection and adjusts the audio processing accordingly. By feeding back the measured delay information and using it to modify subsequent audio operations, the system maintains synchronization accuracy despite the inherent variations in wireless connections.
2Measurement precision
If audio cancellation is applied to remove ambient audio, then voice command recognition accuracy is improved, but the complexity of audio processing increases
Solution Approach 1:
The system extracts and removes the audio cue signal from the ambient audio recording through cancellation processing. By isolating and eliminating the known audio cue components from the mixed recording, the system simplifies the remaining audio signal for voice recognition, improving accuracy without requiring complex processing of the entire audio spectrum.
Solution Approach 2:
The system performs preliminary calibration to measure the time delay and store it as reference data before actual voice recognition operations. This preliminary preparation allows the audio cancellation process to use simple time-based alignment rather than complex real-time analysis, reducing processing complexity while maintaining high voice recognition accuracy.
Data Source
AI summary
An audio cancellation system includes a voice enabled computing system that is connected to an audio output device using a wired or wireless communication network. The voice enabled computing device can provide media content to a user and receive a voice command from the user. The connection between the voice enabled computing system and the audio output device introduces a time delay between the media content being generated at the voice enabled computing device and the media content being reproduced at the audio output device. The system operates to determine a calibration value adapted for the voice enabled computing system and the audio output device. The system uses the calibration value to filter the user's voice command from a recording of ambient sound including the media content, without requiring significant use of memory and computing resources.