Motion-Sensitive Speaker Signal Synchronization
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Solution Overview
Problem
Motion detection signals from multiple active sensor-based devices operating in a common environment can interfere with each other, leading to inaccurate motion detection due to signal overlap, causing devices to incorrectly determine motion presence.
Innovation Solution
A motion-sensitive acoustic speaker with a processing device that synchronizes its motion detection signals with other speakers by emitting its active phase during the idle periods of remotely located speakers, using distinct signal characteristics and timing information to avoid interference, and adjusting its active and idle phases to minimize overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple motion-sensitive devices operate simultaneously in a common environment, then motion detection coverage is improved, but signal interference occurs leading to inaccurate motion detection
Solution Approach 1:
The system implements periodic action by dividing motion detection into discrete time slots, where each device transmits during its assigned slot and remains silent during other slots. This time-division multiplexing approach allows multiple devices to operate in the same environment without signal interference, maintaining both coverage and detection accuracy.
Solution Approach 2:
The system applies segmentation by dividing the operational time into separate segments or slots assigned to different devices. Each device operates independently in its designated time segment, preventing signal overlap and interference while maintaining comprehensive motion detection coverage across the environment.
2Reliability
If multiple devices emit motion detection signals simultaneously, then detection capability is enhanced, but signal overlap causes incorrect motion determinations
Solution Approach 1:
The system uses periodic action with time-division multiplexing to assign specific transmission slots to different devices. Each device transmits its motion detection signals during its designated periodic slot and remains silent during other slots, preventing signal overlap and preserving signal integrity while maintaining enhanced detection capability through multiple devices.
Solution Approach 2:
The system maintains continuity of useful action by ensuring that motion detection coverage is continuous across all devices through coordinated time slots. While individual devices are silent during other slots, the overall system maintains continuous monitoring capability as devices take turns transmitting, preserving both detection capability and signal integrity.
3Speed
If devices transmit motion detection signals continuously, then motion detection responsiveness is improved, but interference with other devices increases
Solution Approach 1:
The system implements periodic action with time-division multiplexing to resolve the contradiction between responsiveness and interference. Each device transmits during its assigned periodic slot with sufficient frequency to maintain responsive detection, while remaining silent during other slots to eliminate signal interference with other devices in the environment.
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 allows for accurate and interference-free motion detection by ensuring that the active phases of motion detection signals from multiple speakers occur during the idle periods of other speakers, enhancing the reliability of motion sensing in shared environments.
Implementation Method 1
detect, based on reflections associated with the active phase of the first motion detection signal received by the at least one receiver, movement in an environment
Data Source
AI summary
A motion-sensitive acoustic speaker may include a housing; a transmitter associated with the housing, a receiver associated with the housing, a interface component associated with the housing, and a processing device. The processing device is configured to: cause the transmitter to emit a first motion detection signal having an active phase and an idle phase; detect movement in an environment of the primary motion-sensitive acoustic speaker; cause a change in a state of the interface component in response to detection of movement in the environment of the motion-sensitive acoustic speaker; detect a presence of a secondary motion-sensitive acoustic speaker in the environment of the motion sensitive acoustic speaker; determine an idle period associated with the idle phase of the second motion detection signal during which a transmitter associated with the secondary motion-sensitive acoustic speaker is not actively transmitting; and cause the transmitter of the motion-sensitive acoustic speaker to emit the first motion detection signal such that the active phase of the first motion detection signal occurs within the idle period.