Earset Ground Separation for RF Noise Reduction
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Solution Overview
Problem
Conventional earsets with a four-pole standard circuit suffer from RF noise interference when used for phone calls, as the ground functions as both an audio and shielding ground, allowing RF noise to flow into electronic devices, and existing noise attenuation techniques are ineffective in earset mode, particularly during activities like driving or walking.
Innovation Solution
The earset design incorporates a switch that separates the audio ground and shielding ground, allowing the right-hand and left-hand speakers to connect with either the audio ground or shielding ground based on the voltage at the microphone terminal, enabling effective noise reduction during phone calls while maintaining the four-pole standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ground is used as both audio ground and shielding ground in a four-pole standard circuit, then the earset structure remains simple and compatible with standard connectors, but RF noise flows into the electronic device during phone calls
Solution Approach 1:
The patent divides the single ground into two separate grounds: an audio ground for audio signals and a shielding ground for RF noise shielding. This segmentation allows each ground to perform its specific function independently, preventing RF noise from contaminating the audio signal while maintaining compatibility with the four-pole connector structure.
Solution Approach 2:
The patent introduces a switching mechanism as an intermediary component that dynamically connects the shielding ground to the audio ground or to the signal ground based on operational mode. This intermediary allows the system to adapt the ground configuration to prevent RF noise interference during phone calls while maintaining structural simplicity.
2Object-affected harmful factors
If conventional noise attenuation techniques are used, then ambient noise is reduced during handset mode, but noise attenuation is ineffective during earset mode activities like driving or walking
Solution Approach 1:
The patent implements a dynamic ground switching mechanism that adapts the ground configuration based on the operational mode (handset mode vs. earset mode). During earset mode, the switching mechanism dynamically connects the shielding ground to isolate RF noise, providing effective noise attenuation in dynamic scenarios like driving or walking, whereas static conventional techniques fail to adapt to these varying conditions.
3Ease of manufacture
If the ground serves dual purposes as audio ground and shielding ground, then manufacturing and assembly are simplified, but noise during phone calls cannot be removed
Solution Approach 1:
The patent segments the ground function into separate audio ground and shielding ground paths within the four-pole connector architecture. This segmentation maintains manufacturing simplicity by using standard connector components while achieving reliable noise-free communication by preventing RF noise from the shielding ground from mixing with audio signals.
Solution Approach 2:
The switching mechanism acts as an intermediary that enables the system to achieve reliable noise-free communication without complicating the manufacturing process. It provides a straightforward switching approach between ground configurations that can be implemented using standard electronic switching components within the existing earset structure.
Data Source
AI summary
An earset, according to various examples, comprises: an electronic device connection unit having a microphone terminal connected to a microphone of the earset, an audio ground terminal connected to an audio ground of the earset, a right speaker terminal, and a left speaker terminal; and a switch for allowing, according to a voltage of the microphone terminal, a right speaker and a left speaker of the earset to be mutually connected with one of the right speaker terminal and the left speaker terminal, and the other one of the right speaker terminal and the left speaker terminal to be connected with a shield ground of the earset. Other examples are possible.