VOX Interface Signal Routing for Hospital Communication
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Solution Overview
Problem
Current hospital communication systems require VOX circuits at each device, making them complex and costly, as they need to determine whether they are receiving or sending communications by sensing input signals on two wires, which is inefficient.
Innovation Solution
A VOX interface that interfaces with two separate communications paths, using a comparator to determine the origin of signals and switches to configure the interface to pass signals through the appropriate path, eliminating the need for VOX circuits at each device by acting as a central interface for multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If VOX circuits are placed at each device to determine signal direction, then each device can independently determine whether it is receiving or sending communications, but the system complexity and cost increase significantly
Solution Approach 1:
The patent merges the VOX circuit functionality from multiple distributed devices into a single centralized VOX interface. This interface handles signal direction determination for all communication paths, eliminating the need for individual VOX circuits at each device. The comparator and switch components are consolidated at the interface level, reducing overall system complexity while maintaining the ability to determine signal origin and route communications appropriately.
Solution Approach 2:
The centralized VOX interface serves multiple communication paths simultaneously, performing the function of multiple VOX circuits through a single multi-functional device. The interface can handle bidirectional communication on multiple paths by using the comparator to identify signal origin and the switch to route signals appropriately, making one device perform what previously required many separate VOX circuits.
2Reliability
If VOX circuits are placed at each device, then each device can sense input signals on two wires to determine communication direction, but the cost of the system increases
Solution Approach 1:
The patent combines multiple VOX circuit functions into a single centralized interface, reducing the total number of VOX circuits from many (one per device) to one. This consolidation maintains the reliability of communication direction detection through the use of a comparator that accurately identifies signal origin, while significantly reducing system cost by eliminating redundant circuitry across multiple devices.
3Device complexity
If a centralized VOX interface is used to determine signal origin, then the number of VOX circuits is reduced, but the interface must handle multiple communication paths simultaneously
Solution Approach 1:
The centralized VOX interface is designed with universal functionality to handle multiple communication paths simultaneously. The comparator can evaluate signals from different paths, and the switch can route signals to appropriate destinations, making the single interface adaptable to various communication scenarios including bidirectional communication on multiple paths without requiring path-specific circuitry.
Data Source
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AI summary
A VOX interface is provided that interfaces with at least two communication paths to two separate devices. One communication path may be to a first electronic device, such as a central monitoring station remote from the VOX interface, and another communication path may be to one or more remote devices, such as to one or more patient devices remote from the VOX interface. The VOX interface may determine which of the communication paths is sending a signal (such as an audio signal), and configure the VOX interface (via one or more switches) to pass the signal through. Specifically, the VOX interface may sense signals indicating the presence of audio from a central station audio bus and the patient station bus, may do some background noise filtering on the signals, and may pass these filtered values through a differentiator circuit to determine which bus presented the audio. Depending on which bus presented the audio, one or more switches (such as a relay) may be configured so that the audio may be passed through.