Microphone Jack Power Communication Module
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Solution Overview
Problem
Existing 4-pole audio jacks cannot supply sufficient power to active slave devices like earphones with additional functions, such as active noise cancellation, and lack a separate terminal for digital data transmission, limiting the ability to perform power and data communication between host and slave devices.
Innovation Solution
A method and apparatus that allow a host device to determine if a slave device requires power and data using a microphone jack, enabling power communication by transmitting power and data through the microphone jack and allowing the slave device to transmit data back, using a host communication module with a host power communication unit and terminal connection unit to manage power pulses and voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additional power lines are provided to supply power to active slave devices, then power supply capability is improved, but device complexity increases
Solution Approach 1:
The patent reuses the existing microphone jack (designed for audio input) to serve multiple functions: transmitting microphone signals, supplying power to active slave devices, and enabling two-way digital data communication. This multi-functional use eliminates the need for separate power lines and data lines, resolving the contradiction between power supply capability and device complexity
Solution Approach 2:
The patent combines power transmission and data communication functions into the existing audio signal transmission path. By encoding digital data in audio signals and using the same physical connector for both power and data, the system merges multiple functions into a single interface, reducing overall system complexity while maintaining full functionality
2Loss of information
If a separate terminal for digital data transmission is added, then data communication capability is improved, but device complexity increases
Solution Approach 1:
The microphone jack is designed to handle multiple signal types simultaneously: analog microphone signals, digital data signals (through encoding/decoding), and power transmission. This universal interface eliminates the need for separate data terminals, maintaining data communication capability while avoiding increased connector complexity
Solution Approach 2:
The patent replaces physical separate data lines with signal encoding techniques. Digital data is transmitted by encoding it within audio frequency signals that can travel through the existing audio path, substituting a complex multi-line physical connection with a simpler single-line signal-based solution
3Adaptability or versatility
If existing 4-pole audio jack is used without modifications, then compatibility is improved, but power supply capability deteriorates
Solution Approach 1:
The system maintains full compatibility with existing 4-pole audio jacks by reusing the same physical connector and signal paths. The microphone jack, originally designed only for audio input, is enhanced to also provide power transmission and digital data communication, achieving multi-functionality without requiring hardware modifications to the connector itself
Solution Approach 2:
The host device automatically detects whether a connected slave device is active or passive and adjusts its behavior accordingly. The system self-configures to provide appropriate power levels and communication modes without requiring manual intervention or hardware switches, maintaining compatibility while enabling enhanced power supply when needed
Data Source
AI summary
Disclosed is a host communication module, which is provided in a host device that can be connected to a slave device, including: a host power communication unit, in a transmission mode, receiving a power voltage for driving an active slave device from the host device and allowing the host device and the active slave device to perform power communication using the power voltage, and in a reception mode, receiving a power pulse from the active slave device and allowing the host device and the active slave device to perform power communication using the power pulse and a terminal connection unit transmitting or receiving the power pulse to or from the active slave device via a microphone jack provided in the host device.