Audio Output Synchronization for Voice Recognition Interference
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Solution Overview
Problem
Voice recognition systems face degradation due to interference from nearby audio sources, such as televisions, and local audio outputs, which can hinder the accurate processing of voice commands if the interference signals are not synchronized and cancelled effectively.
Innovation Solution
Implementing a method to synchronize interference signals from local and remote audio sources by delaying the output of local audio to align it with the audio input, allowing for simultaneous capture and cancellation of these signals, thereby improving the accuracy of voice command processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If local audio output is used for voice recognition feedback, then user experience is improved, but interference with voice command capture deteriorates
Solution Approach 1:
The system performs preliminary synchronization by delaying the local audio output signal to match the timing of remote audio signals before they are captured by the microphone. This preliminary alignment ensures that when the audio signals are played through local speakers, they arrive at the microphone at the same time as remote audio, enabling effective cancellation without degrading voice command capture quality
Solution Approach 2:
The system converts the harmful local audio interference into a beneficial cancellation opportunity by capturing the local audio signal, synchronizing it with remote audio timing, and using it as a reference signal to actively cancel both local and remote audio interference from the voice command capture channel
2Object-generated harmful factors
If audio signals are cancelled without synchronization, then noise cancellation is attempted, but cancellation accuracy deteriorates
Solution Approach 1:
The system performs preliminary timing alignment by delaying the local audio output signal to synchronize with remote audio signals before cancellation processing. This ensures that all audio interference signals (local and remote) are time-aligned when captured by the microphone, allowing the cancellation algorithm to effectively subtract them from the voice command signal with high accuracy
Solution Approach 2:
The system uses feedback by capturing the local audio output signal, synchronizing it with remote audio timing, and using this synchronized signal as a reference for the cancellation algorithm. The cancellation system continuously adjusts based on the synchronized reference signal to maintain accurate noise cancellation
Data Source
AI summary
A first computing device may comprise at least one audio output and at least one audio input. The first computing device may determine a first delay associated with output of first audio from a second computing device located remote to the first computing device. Output of second audio may be caused via the at least one audio output based on the first delay. An audio input signal comprising the first audio, the second audio, and third audio indicative of a voice command may be received via the at least one audio input. At least one action may be caused to be performed based on the voice command. The at least one action may be caused to be performed based on removal of the first audio and the second audio from the audio input signal.