Acoustic Presence Detection via Adaptive Filter
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Solution Overview
Problem
Existing presence detection sensors face accuracy issues due to distance limitations and blind spots, making it difficult to detect individuals beyond a certain range or behind objects, and increasing the number of sensors to address these issues is costly and inefficient.
Innovation Solution
An acoustic presence detection system using a processor, microphone, and adaptive filter that transmits sound waves and detects changes in the room's impulse response to determine the presence of objects, covering all areas without blind spots even with a single microphone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are deployed at different locations to increase coverage and reduce blind spots, then presence detection coverage is improved, but system cost and complexity increase
Solution Approach 1:
The patent replaces traditional optical/mechanical presence detection sensors with an acoustic detection system that uses sound wave transmission and analysis. The system transmits acoustic signals through the room and analyzes reflected waves to detect presence, eliminating the need for multiple optical sensors while achieving comprehensive coverage without blind spots
Solution Approach 2:
The acoustic presence detection system serves multiple functions: it detects presence throughout the entire room volume, identifies objects behind furniture and obstacles, and provides continuous monitoring without requiring multiple separate sensor units. The single acoustic system replaces what would traditionally require multiple specialized sensors
2Measurement precision
If traditional presence detection sensors are used, then detection is possible in limited areas, but accuracy decreases with distance and blind spots are created
Solution Approach 1:
The patent transitions from two-dimensional surface-based optical detection to three-dimensional volumetric acoustic detection. By transmitting sound waves through the entire room volume and analyzing reflections from all directions, the system achieves accurate detection throughout the full spatial volume, eliminating distance-related accuracy degradation and blind spots inherent in planar sensor arrangements
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
The system provides comprehensive room coverage with no blind spots and improved presence detection accuracy, reducing costs by eliminating the need for multiple sensors while maintaining high sensitivity.
Implementation Method 1
an acoustic presence detection system that transmits sound waves and detects changes in the room's impulse response
Implementation Method 2
detects changes in the room's impulse response to determine the presence of objects
Data Source
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AI summary
One or more embodiments set forth an audio presence detection system, with a memory that includes an acoustic presence detection application, and a processor that executes the acoustic presence detection application. The audio presence detection system receives a first input signal associated with a first speaker, and receives a second input signal associated with a first microphone. The audio presence detection system generates, via an adaptive filter, a first estimation signal based on at least the first input signal and an impulse response associated with a room related to the first speaker and the first microphone. The audio presence detection system computes a first error signal based on the second input signal and the first estimation signal. The audio presence detection system determines that an object is present within a space based on a magnitude associated with the first error signal relative to a first threshold level.