Acoustic Presence Detection Interference Avoidance
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Solution Overview
Problem
Acoustic presence detection in electronic devices is often hindered by interference from other sources, leading to false positives and increased power consumption.
Innovation Solution
The method involves monitoring the surroundings to identify time windows and frequency ranges with minimal interference, allowing for the transmission of ultrasound presence detection signals without interference, thereby reducing power consumption and false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic presence detection is performed continuously to improve detection reliability, then false positives increase and power consumption increases
Solution Approach 1:
The system performs presence detection at periodic intervals rather than continuously. The processor activates the acoustic transducer to emit ultrasound signals and detect reflections only at scheduled time intervals, reducing overall power consumption while maintaining adequate detection reliability for the application.
Solution Approach 2:
The system performs preliminary environmental monitoring to detect the presence of other acoustic devices before initiating presence detection. By identifying interfering devices in advance, the system can adjust its transmission timing or frequency to avoid interference, reducing false positives without requiring continuous high-power operation.
2Measurement precision
If acoustic presence detection is performed to improve user detection capability, then false positives increase due to interference from other sources
Solution Approach 1:
The system continuously monitors the acoustic environment for interference from other devices and uses this feedback to adjust its detection strategy. When interference is detected, the processor modifies transmission timing, frequency selection, or signal processing parameters to maintain detection accuracy despite the presence of other acoustic sources.
Solution Approach 2:
The system dynamically changes detection parameters such as transmission frequency, time-of-flight measurement windows, and signal threshold levels based on the detected acoustic environment. By adapting these parameters in response to environmental conditions, the system maintains measurement precision while accounting for interference from other devices.
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
This approach effectively reduces false positives in presence detection while minimizing power consumption by optimizing signal transmission to avoid interference.
Implementation Method 1
acoustic presence detection signals, preferably in the ultrasound range
Implementation Method 2
receiving signals reflected from an object
Implementation Method 3
measuring the proximity or distance to an object, the trajectory, angle or velocity of at least one object using ultrasound measurements
Data Source
AI summary
The present invention relates to a device and a method for presence detection in the vicinity of a device. The device including an acoustic receiver and corresponding analyzing unit for analyzing the received signals, and an acoustic transmitter, the transmitter and received being configured to operate within a predetermined acoustic frequency range. The method including the steps of receiving and analyzing acoustic signals from the environment within said frequency range and evaluating the periodicity and volume of the signals and identifying frequency ranges and/or time windows with low risk for interference, the transmitter being configured to transmit a presence detection signal within the identified frequency range and time windows, the receiver receiving reflections from the transmitted presence detection signals from which the analyzing unit indicates the possible presence of a user.