Lapel Audio System Hands-Free Mode Transition
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Solution Overview
Problem
Communication between wearers of self-contained breathing apparatuses, such as firefighters, is difficult due to the need for manual operation of existing radio systems, which are prone to interference and entanglement, and lack seamless transition between push-to-talk and hands-free modes, especially in noisy and hazardous environments.
Innovation Solution
A multi-channel communication apparatus with a controller and radio receiver that selectively produces audio and transmit signals based on a selector signal, allowing for seamless transition between push-to-talk and hands-free modes, and includes a housing for wearability, a microphone, and a speaker, with provisions for amplification and channel selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a corded link connects the microphone and speaker to the radio, then audio signal transmission is achieved, but the cord becomes entangled in clothes or equipment and may loosen or detach, creating a safety hazard
Solution Approach 1:
The patent removes the corded connection from the system by implementing wireless communication between the microphone/speaker assembly and the radio unit. The audio signals are transmitted wirelessly through the radio frequency channel, eliminating the physical cord that caused entanglement and safety hazards while maintaining audio signal transmission reliability.
Solution Approach 2:
The mechanical cord connection is replaced with an electromagnetic radio frequency connection. The audio signals that were previously transmitted through a physical cable are now transmitted wirelessly through the air using radio waves, substituting a mechanical system with an electromagnetic field-based system.
2Reliability
If push-to-talk activation is used, then single-channel communication is achieved, but one hand must be used to press the button, leaving only one hand free for other tasks
Solution Approach 1:
The system automatically detects voice signals and activates transmission without requiring manual button pressing. The voice-activated circuitry monitors the audio input and automatically enables the transmit function when speech is detected, allowing the user to communicate hands-free while maintaining reliable communication control.
Solution Approach 2:
The mechanical push-to-talk button operation is replaced with an electronic voice detection system. Instead of requiring physical pressure on a button to activate transmission, the system uses electronic sensors to detect the presence of voice signals and automatically activates the transmit function.
3Quantity of substance
If the microphone picks up ambient noise for transmission, then all audio signals are captured, but interference from ambient noise such as fire scene noise reduces communication clarity
Solution Approach 1:
The system applies different processing characteristics to different audio frequency ranges. Voice frequency signals are amplified and transmitted with higher gain, while ambient noise frequencies are suppressed or rejected. This selective amplification based on local frequency characteristics maintains communication clarity while capturing necessary audio signals.
Solution Approach 2:
The system monitors the audio input signals and automatically adjusts amplification levels based on the detected signal characteristics. When voice signals are detected, the system increases amplification for those frequencies; when ambient noise is detected, the system reduces amplification or applies filtering, creating a feedback-controlled audio processing system.
4Ease of operation
If voice detection circuitry is used for hands-free operation, then automatic activation is achieved, but ambient noise interference causes false triggering of the circuitry
Solution Approach 1:
The system dynamically adjusts the sensitivity threshold and detection parameters of the voice-activated circuitry based on the ambient noise level. When high ambient noise is detected, the system raises the activation threshold to prevent false triggering; when ambient noise is low, the threshold is lowered to enable sensitive voice detection, maintaining hands-free operation reliability across different environmental conditions.
Data Source
AI summary
An apparatus for communicating using multiple channels. The apparatus includes a first radio receiver and a controller. The first radio receiver is configured to produce a first receive signal in response to a first radio frequency signal in a first frequency band. The controller has a first receive input for receiving the first receive signal, an audio input for receiving an audio in signal, a selector input for receiving a selector signal, an audio output for producing an audio out signal and a first transmitter output for producing a first transmitter signal. The first transmit output is configured for communication with a radio transmitter operable to transmit a second radio frequency signal in a second frequency band different from the first frequency band. The controller is configured to cause the audio output to produce the audio out signal in response to the first receive signal when the selector signal is in a first state and to cause the first transmitter output to produce the first transmit signal in response to the audio in signal when the selector signal is in a second state.