In-Vehicle Audio Feedback Cancellation via Modular Filters
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Solution Overview
Problem
Communication between individuals in a vehicle is hindered by positioning and ambient noise, such as wind noise and entertainment audio, which existing technologies have not effectively addressed.
Innovation Solution
A system comprising a feedback filter, an adaptive filter, and a signal combiner processes audio signals from microphones to cancel feedback portions generated by loudspeakers, improving communication clarity by generating and combining cancellation signals with the audio signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If audio signals are processed to cancel feedback portions, then communication clarity is improved, but device complexity increases due to multiple filters and signal processing components
Solution Approach 1:
The feedback cancellation system is divided into distinct functional modules: a feedback filter for initial feedback signal processing, an adaptive filter for dynamic adjustment, and a signal combiner for merging processed signals. This segmentation allows each component to perform a specific function, improving overall feedback cancellation effectiveness while maintaining manageable system complexity through modular design.
2Measurement precision
If feedback cancellation processing is applied to audio signals, then speech clarity is improved, but processing time and computational resources increase
Solution Approach 1:
The feedback filter performs preliminary processing of the feedback signal before it is combined with the original audio signal. By pre-processing the feedback portion separately, the system reduces the computational burden on subsequent processing stages and enables faster real-time operation, thereby reducing overall processing time while maintaining speech clarity.
3Object-affected harmful factors
If adaptive filtering is used to generate cancellation signals, then feedback noise is reduced, but energy consumption increases
Solution Approach 1:
The adaptive filter processes only the feedback portion of the audio signal rather than the entire audio stream. By applying adaptive filtering selectively to the feedback component identified by the feedback filter, the system achieves effective feedback noise reduction while minimizing unnecessary computational operations and reducing overall energy consumption.
Data Source
AI summary
A system includes a feedback filter configured to receive an audio signal from a microphone and to process the audio signal based on a feedback path between a loudspeaker and the microphone. The system also includes an adaptive filter coupled to the feedback filter. The system further includes a signal combiner coupled to the microphone and to the adaptive filter.