Electrically Isolated Push-To-Talk Device for Noise Reduction
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Solution Overview
Problem
Conventional Push-To-Talk (PTT) devices in communication systems electrically tie ground signals, leading to noise coupling and disrupted audio transmission due to multiple ground paths, which renders radio signals undecipherable.
Innovation Solution
The introduction of Electrically-Isolated Push-To-Talk (EI-PTT) devices, which prevent direct current connections between radios and headsets, thereby isolating ground signals and eliminating noise coupling by maintaining separate electrical paths for transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional PTT devices electrically tie ground signals to enable communication control, then the system can operate with centralized power supply and control, but noise coupling occurs and audio transmission is disrupted
Solution Approach 1:
The patent introduces an intermediary device (the PTT device with electrically isolated ground signals) that mediates between the radio and headset. This intermediary maintains separate electrical paths for transmission and reception while still enabling communication control, thereby eliminating noise coupling without sacrificing operational capability.
2Extent of automation
If multiple ground paths are used in the system, then centralized power supply and control are enabled, but noise coupling increases and signals become undecipherable
Solution Approach 1:
The patent segments the electrical connections by maintaining separate electrical paths for transmission and reception. The PTT device divides the ground signal paths into isolated segments, allowing centralized control to be maintained while preventing noise from coupling between different parts of the system, thus preserving signal clarity.
3Ease of operation
If ground signals are electrically tied to enable push-to-talk functionality, then transmission mode switching is possible, but communication noise is generated and audio transmission is disrupted
Solution Approach 1:
The PTT device acts as an intermediary that enables transmission mode switching while maintaining electrically isolated ground signals. This isolation prevents the generation of communication noise that would otherwise disrupt audio transmission, allowing the device to provide push-to-talk functionality without the harmful side effects.
Data Source
AI summary
Communications systems containing an electrically-isolated Push-To-Talk (EI-PTT) device are described in this application. The communication systems contain multiple radios, a microphone/headset, and a centralized power supply. The systems also contain an EI-PTT device which reduces or eliminates noise that can disrupt the audio transmission. The EI-PTT device allows an operator or user of the communication system to actuate a button which remotely switches the radio from receive mode to transmit mode. This allows multiple users to listen (receive) to communication traffic on the same frequency at all times, but only speak (transmit) on the frequency while activating the EI-PTT device. Unlike other PTT devices which electrically tie the ground signals inside the device, the EI-PTT devices electrically isolate the ground signals to reduce the problem of noise coupling. Other embodiments are described.