Audio Feedback Time Shift Filter for Voice Recognition
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Solution Overview
Problem
Vocal command recognition systems face challenges in distinguishing user commands from audio feedback and environmental noise, particularly when program audio content, such as lyrics, interferes with voice recognition algorithms.
Innovation Solution
An audio feedback time shift filter system that separates program audio feedback from environmental audio using a deterministic delay to synchronize and filter out program content audio feedback, preventing misinterpretation of user commands by compensating for feedback loop delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vocal command recognition is implemented to control audio systems, then user convenience and hands-free operation are improved, but audio feedback from program content causes misinterpretation and false commands
Solution Approach 1:
The audio signal is segmented into program content audio and environmental audio components. The system separates these segments by identifying and removing the program content audio portion from the combined audio signal, allowing pure environmental audio (user commands) to be processed for recognition.
Solution Approach 2:
The harmful program content audio feedback is extracted and removed from the environmental audio signal. The system identifies the program content audio patterns and extracts them from the mixed audio signal before voice recognition processing, preventing false command generation.
2Adaptability or versatility
If audio feedback is emitted to enhance user experience and program immersion, then user engagement is improved, but interference with voice recognition algorithms increases
Solution Approach 1:
The system performs preliminary processing by pre-identifying and pre-removing program content audio from the environmental audio signal before the voice recognition algorithm processes the signal. This preliminary action prevents the recognition algorithm from encountering interfering audio patterns in the first place.
3Productivity
If program audio content is played back with feedback loop, then audio system functionality is improved, but false command generation increases
Solution Approach 1:
The system converts the harmful feedback loop into a beneficial feature by using the deterministic delay characteristics to identify and remove program content audio. The feedback loop that previously caused false commands is now utilized to track and eliminate the interfering audio patterns, improving overall system reliability.
Data Source
AI summary
Audio feedback time shifted filtering systems and methods are presented. The systems and methods facilitate separation of program audio feedback from received environmental audio (e.g., audio sensed by a microphone.) The separation of the program audio feedback reduces interference from program content audio feedback on performance of voice recognition operations. In one embodiment of a personal video recorder audio filter method, environmental audio patterns are received, an audio feedback time shift filter process is executed for separating out program content from the environmental audio patterns, and voice recognition is performed on the filtered environment audio patterns (without interference from program audio content feedback). The time shift or deterministic delay provides a closer correlation between program audio content and program audio content feedback received at the microphone and permits input timing compensation to compensate for feedback loop delays.