Expanded Temperature Audio Path Switching for Portable Radios
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Solution Overview
Problem
Portable communication devices, particularly public safety radios and their audio accessories, face challenges in maintaining mission critical audio functionality over extreme temperature ranges, as existing components are not capable of operating effectively at such extremes, and simply disabling audio functions or reducing performance is not acceptable.
Innovation Solution
A method and apparatus that monitor temperature to disable temperature-sensitive microprocessors, switching audio paths to high-temperature capable electronic paths, allowing microphone and speaker signals to be processed without relying on digital signal processors, enabling mission critical audio functionality through analog audio even at extreme temperatures, and providing a hardware bypass for software failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital signal processors are used for audio processing, then audio processing capability is improved, but temperature operating range is limited
Solution Approach 1:
The patent divides the audio processing system into two separate paths: a digital signal processing path for normal temperature operation and an analog audio path for extreme temperature operation. This segmentation allows each path to be optimized for its specific operating conditions, resolving the contradiction between digital processing capability and temperature range limitations.
Solution Approach 2:
The patent changes the operational parameters of the audio processing system by switching between digital and analog modes based on temperature conditions. When temperature exceeds the digital processor's operating range, the system transitions to analog processing, effectively changing the processing parameter to maintain operation across extended temperature ranges.
2Reliability
If audio functions are disabled under high temperatures, then device reliability is improved, but mission critical audio functionality is lost
Solution Approach 1:
The patent introduces an intermediary analog audio path that acts as a mediator between the digital signal processor and the audio output. When the digital processor becomes unreliable at high temperatures, the analog path provides continuous audio functionality, ensuring mission critical operations maintain reliability without complete functionality loss.
3Reliability
If digital signal processing is used, then audio quality is improved, but operational reliability at extreme temperatures deteriorates
Solution Approach 1:
The patent implements a dynamic audio processing system that automatically adapts its processing mode based on temperature conditions. The system transitions from digital to analog processing dynamically when temperature thresholds are exceeded, maintaining operational reliability while preserving audio quality through the appropriate processing path for current conditions.
Data Source
AI summary
A method and apparatus for operation of a remote speaker microphone over an expanded temperature range. By monitoring a temperature of the communication device, a temperature sensitive microprocessor can be disabled above a predetermined extreme temperature, thereby allowing control of an audio path of the communication device to be modified. Microphone and speaker signals of the communication device can be switched or rerouted to an electronic path capable of operating above the predetermined extreme temperature for expanded operation while previous microprocessor controlled digital and analog audio circuits are shut down.