USB-C Audio Port Switching to Reduce Crosstalk
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Solution Overview
Problem
The use of type-C connectors for audio devices in electronic devices leads to shared wiring, causing increased internal resistance and crosstalk due to the need for switch control, which affects connection performance.
Innovation Solution
Implementing a method that selectively grounds transmission wires based on the coupling orientation of the audio device, using switch units and a ground unit to minimize composite resistance and reduce crosstalk by optimizing the connection paths between the codec and the audio device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If type-C connector is used for audio device connection, then device volume is reduced and multi-functionality is achieved, but crosstalk performance deteriorates due to shared wiring and switch control
Solution Approach 1:
The transmission wires are divided into separate groups: dedicated wires for audio devices and shared wires for other devices. Switch units selectively connect these wire groups based on the connected device type, isolating audio signals from other signals to reduce crosstalk while maintaining multi-functionality through the type-C connector.
Solution Approach 2:
Switch units act as intermediary components between the codec and the type-C connector, selectively routing signals through different wire groups. This intermediary mechanism separates audio signal paths from other signal paths, reducing crosstalk while preserving the multi-functional capability of the type-C connector.
2Device complexity
If shared wiring is used for type-C connector, then device complexity is reduced, but connection performance deteriorates due to increased internal resistance
Solution Approach 1:
Different wire groups have different characteristics optimized for different purposes: dedicated wires provide low resistance for audio signals, while shared wires serve multiple functions. The switch units selectively activate the appropriate wire group based on the connected device, ensuring optimal connection performance for each device type while maintaining overall wiring simplicity.
Data Source
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AI summary
An electronic device may include a connection unit including four ports for connecting an external audio device; a codec configured to generate an audio signal transmitted to the external audio device; a first switch unit configured to, if the external audio device is electrically connected to the electronic device, connect the first port and the second port with the codec; a second switch unit configured to, if the external audio device is electrically connected to the electronic device, connect the third port and the fourth port with the codec; a third switch unit configured to swap connection directions of the third port and the fourth port according to a coupling orientation of the external audio device and the electronic device; and a ground unit connected to the third port and the fourth port and configured to ground one of the third port and the fourth port.