Playback Device Movement Detection and Audio Adjustment
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Solution Overview
Problem
Playback devices experience mechanical noise and instability due to 'walking' caused by speaker diaphragm movement during audio playback, which can lead to device damage from falling or displacement.
Innovation Solution
Incorporating sensors like accelerometers, gyroscopes, or magnetometers to detect movement and adjust audio output parameters such as volume or equalization to reduce the physical movement of the playback device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If speaker diaphragm moves to play audio sound, then audio playback function is achieved, but playback device physically moves causing mechanical noise and instability
Solution Approach 1:
The system uses sensors to detect device movement during audio playback and feeds this information back to the processor, which then adjusts audio parameters to reduce further movement. This closed-loop feedback mechanism continuously monitors and corrects the walking effect, improving device stability while maintaining audio playback functionality.
Solution Approach 2:
The system dynamically changes audio playback parameters such as volume level, equalization settings, or frequency content based on detected device movement. By adjusting these parameters in real-time, the system reduces the acoustic radiation pressure that causes device movement, thereby eliminating mechanical noise and improving stability.
2Power
If audio volume is increased for better sound quality, then audio playback performance is improved, but speaker diaphragm movement increases causing more device walking
Solution Approach 1:
The system monitors device movement at different volume levels and uses this feedback to determine optimal playback parameters. When high volume is requested, the system can detect increased movement tendency and automatically adjust equalization or reduce bass content to minimize device walking, allowing high power output without compromising stability.
Solution Approach 2:
The system dynamically adjusts audio parameters based on volume level and detected movement. At higher volumes, it may apply different equalization curves or limit certain frequency ranges that cause excessive diaphragm excursion, thereby maintaining audio power while preserving device position stability.
3Reliability
If movement detection is added to reduce device walking, then device stability is improved, but system complexity increases due to additional sensors and processing
Solution Approach 1:
The system uses the device's existing sensors (accelerometers, gyroscopes, magnetometers) that are already part of the playback device for other functions. By repurposing these existing components for movement detection related to walking effect, the system avoids adding dedicated sensors and minimizes the increase in system complexity while still achieving improved device stability.
Solution Approach 2:
The system employs multi-functional use of existing sensor data. The same sensors that detect device movement for various purposes (orientation, motion tracking) are also utilized to detect walking effect during audio playback. This universal approach allows movement detection without requiring separate dedicated sensing systems, thereby limiting the increase in device complexity.
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 minimizes device movement and prevents damage by dynamically adjusting audio settings in response to detected movement, ensuring stable operation and reduced mechanical noise.
Implementation Method 1
Incorporating sensors like accelerometers, gyroscopes, or magnetometers to detect movement
Implementation Method 2
Incorporating sensors like accelerometers, gyroscopes, or magnetometers to detect movement
Implementation Method 3
Incorporating sensors like accelerometers, gyroscopes, or magnetometers to detect movement
Data Source
AI summary
Method and apparatus for physical detecting movement of a playback device which plays audio sound via a speaker enclosed in the playback device. While the speaker plays the audio sound, a determination is made whether the playback device is physically moving. In response to the playback device physically moving, the audio sound played by the speaker is modified, for example, by adjusting the volume or equalization of the audio sound, so as to reduce the physical movement of the playback device.