Earbud Case DC Voltage Control for Intermodulation Prevention
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Solution Overview
Problem
Intermodulation interference between earbud radios housed in close proximity within an earbud case violates radio frequency emission regulations and hampers effective communication.
Innovation Solution
A low-latency earbud-to-case insertion event detection mechanism using capacitor-based current detection to reduce transmission power of radios, combined with DC voltage threshold control for power management, minimizing intermodulation interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If earbuds are housed in close proximity within an earbud case, then space utilization is improved, but intermodulation interference occurs between radios
Solution Approach 1:
The system detects earbud insertion into the case before communication begins, using a capacitor-based detection circuit that senses the change in electrical characteristics when an earbud is placed in the case. This preliminary detection allows the system to proactively reduce transmission power of the radios before intermodulation interference can occur, rather than reacting after the problem arises.
2Object-generated harmful factors
If transmission power of radios is reduced to prevent intermodulation, then harmful interference is minimized, but communication range and quality deteriorate
Solution Approach 1:
The system dynamically adjusts the transmission power of the radios based on the detected state of earbuds in the case. When earbuds are detected as being in the case, the transmission power is reduced to minimize intermodulation interference. When earbuds are removed from the case, the transmission power is increased to ensure reliable communication. This dynamic adjustment allows the system to optimize both interference reduction and communication quality according to real-time conditions.
3Use of energy by moving object
If DC voltage threshold control is applied for power management, then energy consumption is reduced, but power delivery capability is limited
Solution Approach 1:
The system changes the DC voltage parameter dynamically based on the operational state. When earbuds are detected in the case and transmission power is reduced, the system also reduces the DC voltage supplied to the radios and other components. This voltage threshold control ensures that power consumption is minimized when full power is not needed, while still providing sufficient voltage and power delivery capability when earbuds are removed and full communication functionality is required.
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
Reduces latency by approximately 99.9% and prevents intermodulation interference, optimizing communication efficiency and compliance with RF emission regulations.
Implementation Method 1
A low-latency earbud-to-case insertion event detection mechanism using capacitor-based current detection
Implementation Method 2
Power management of communication system by direct current (DC) voltage threshold control
Data Source
AI summary
An apparatus includes of a first earbud and a second earbud, each including an interface chip and a case. The case includes a case interface chip configured to communicate data with, and transfer power to, interface chips of the first earbud and the second earbud. The case also includes a housing to provide enclosures for the first earbud and the second earbud. The case interface chip is mated with interface chips of the first earbud and the second earbud when the first earbud and the second earbud are inserted in the housing, and wherein the case, the first earbud, and the second earbud are configured to operate at a multiple, different bias voltage levels.