Acoustic Event Detection via Audio Subtraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems fail to differentiate between audio inputs from presentations and actual events like gunshots or explosions in public venues, leading to potential false alarms and a need for a method to accurately detect and alert authorities to real events.
Innovation Solution
A system comprising acoustic sensor units, a central processing unit, and an auxiliary input system that differentiates between presentation audio signals and actual event signals by analyzing differential audio data for temporal and frequency spectrum characteristics, and triggers silent or audible alerts to law enforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic sensor units detect all audio signals in the area, then real events like gunshots or explosions can be detected, but false alarms occur due to presentation audio signals
Solution Approach 1:
The system extracts and removes the presentation audio signal component from the total detected audio signal. The central processing unit subtracts the known presentation audio track from the acoustic sensor input, isolating only the differential audio that represents actual events occurring in the venue, thereby eliminating false alarms from presentation sounds.
Solution Approach 2:
The system uses feedback by continuously comparing the detected audio signal with the expected presentation audio signal. The central processing unit analyzes the differential between what should be playing (presentation audio) and what is actually detected, using this feedback loop to identify anomalies that indicate real events.
2Speed
If the system alerts authorities for all detected events, then real events are reported timely, but unnecessary alerts are generated from false events
Solution Approach 1:
The system performs preliminary analysis of audio signals to determine whether they represent real events or presentation audio before generating alerts. The central processing unit evaluates temporal and frequency characteristics of differential audio data to pre-classify signals, ensuring that only genuine events trigger alerts while maintaining rapid response times.
Solution Approach 2:
The system changes parameters by analyzing multiple characteristics of audio signals including temporal patterns, frequency spectrum content, and amplitude levels. By examining these different parameters of the differential audio data, the system can distinguish between real events and false events with high accuracy while maintaining fast alert generation.
3Measurement precision
If multiple acoustic sensor units are positioned throughout the area, then event location can be determined accurately, but system complexity increases
Solution Approach 1:
The system segments the detection area into multiple zones with strategically positioned acoustic sensor units. Each sensor unit independently monitors its local area, and the central processing unit combines data from multiple segments to determine overall event location and characteristics, achieving accurate spatial detection while maintaining manageable system complexity through modular deployment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces false alarms by accurately identifying real events, ensuring timely and appropriate alerts to authorities in movie, stage, or theater settings, thereby enhancing safety.
Implementation Method 1
at least one acoustic sensor unit configured to detect an audio signal of an event within the area
Data Source
AI summary
This invention provides a system and method that is used to detect gunfire or explosions in an area with a sound system such as a movie, stage or theater setting, by differentiating the sounds in the presentation from those occurring in the physical location and automatically alerting authorities of the event in the movie or stage theater setting.