Directional Audio Attenuation for In-Car Emergency Siren Detection
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Solution Overview
Problem
Advanced automotive entertainment systems, while providing high-quality audio, often mask external noise, including important emergency signals like sirens, making it difficult for drivers to detect them.
Innovation Solution
An audio signal attenuation system that processes audio signals to selectively filter and attenuate emergency warning frequencies, determining direction and applying multi-channel attenuation coefficients to allow sirens to be heard over music, while maintaining music integrity and alerting the driver through audio cues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If audio signal volume is increased for entertainment, then audio quality is improved, but external emergency signals become undetectable
Solution Approach 1:
The system extracts and identifies specific frequency components corresponding to emergency warning signals from the mixed audio environment. By isolating these critical frequency bands, the system can selectively process only the emergency signal portions while leaving the rest of the audio entertainment signal intact, thus solving the contradiction between maintaining high audio volume and detecting external emergency signals.
Solution Approach 2:
The system applies different processing characteristics to different frequency bands of the audio signal. Specifically, it identifies frequency ranges characteristic of emergency warnings and applies enhanced detection and alerting mechanisms only to those bands, while maintaining standard audio reproduction for other frequencies. This localized processing approach allows simultaneous high-quality audio entertainment and emergency signal detection.
2Difficulty of detecting and measuring
If audio signal volume is turned down drastically to hear alarm, then emergency signals become detectable, but audio entertainment quality deteriorates
Solution Approach 1:
The audio signal is segmented into multiple frequency bands, with specific attention given to identifying and isolating the frequency range characteristic of emergency warning signals. By segmenting the audio spectrum in this way, the system can independently control the processing of emergency signal frequencies versus entertainment audio frequencies, eliminating the need to reduce overall volume to detect alarms.
Solution Approach 2:
The system introduces an intermediary processing stage that analyzes the audio signal for emergency characteristics and generates separate alert outputs. This intermediary layer allows the original audio signal to continue playing at full volume while simultaneously detecting and highlighting emergency warnings through dedicated alert mechanisms, thus maintaining both audio quality and emergency detectability.
3Difficulty of detecting and measuring
If selective frequency attenuation is applied to emergency signals, then emergency detectability is improved, but audio signal integrity is affected
Solution Approach 1:
The system dynamically adjusts the processing applied to different frequency bands based on real-time detection of emergency signal characteristics. When emergency signals are detected in specific frequency ranges, the system temporarily enhances those bands for alerting purposes while maintaining the original audio signal integrity for non-emergency frequencies. This dynamic, conditional processing approach preserves audio fidelity while enabling effective emergency detection.
Data Source
AI summary
An audio signal attenuation system and method for detecting an audio emergency warning signal (or alarm) in a vehicle in which an audio signal is being played. Embodiments of the system and method make it easier for a police, fire, or other emergency alarm or siren to be heard in a loud or noisy listening environment when audio signal is being reproduced. This is achieved using selective frequency attenuation, which identifies a frequency of the alarm and then selectively attenuates the alarm frequency in the audio signal. Moreover, direction data that includes information about from which direction the alarm is coming can be used to selectively attenuate the alarm frequency in certain channels (or speakers) of the audio signal. In some embodiments, audio cues are used to alert the listener to the alarm signal and are adjusted based on alarm distance from the vehicle, speed, and the type of alarm.