Programmable Signal Generator Tone Stability
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Solution Overview
Problem
Current tone-out systems for first responders are limited by their inability to generate a wide range of tones without hardware changes, are difficult to program, lack cross-compatibility, and have reliability issues due to analog oscillators prone to drift, leading to high costs and maintenance challenges, especially in inter-agency communication and backup systems.
Innovation Solution
A programmable signal generator that uses a microprocessor module, multi-channel synthesis core, and radio interface control logic to generate a wide variety of tone patterns and sequences, including complex simultaneous tones, with a user-friendly interface and the ability to log dispatch activity, allowing for easy programming and integration with existing systems without requiring hardware changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog oscillators are used to generate tones, then the system can produce audible signals, but the oscillators are prone to drift and require frequent calibration
Solution Approach 1:
The patent replaces mechanical analog oscillators with a digital signal processing system using a microprocessor and software algorithms to generate tones. This substitution eliminates the drift problem inherent in analog oscillators while maintaining tone generation capability, and removes the need for manual calibration maintenance.
Solution Approach 2:
The patent changes the fundamental parameter of tone generation from analog voltage control to digital frequency synthesis. By using a phase-locked loop (PLL) and direct digital synthesis (DDS) techniques, the system achieves high frequency stability without drift, transforming the unreliable analog parameter into a precise digital parameter.
2Adaptability or versatility
If hardware changes are made to generate different tones, then various tone patterns can be produced, but the system becomes complex and costly to reconfigure
Solution Approach 1:
The patent implements dynamic reconfigurability through software control rather than static hardware configuration. The microprocessor can dynamically change tone parameters (frequency, duration, pattern) via programmable interfaces, allowing the system to adapt to different communication protocols and agencies without any hardware changes.
Solution Approach 2:
The patent creates a universal tone generator that can produce multiple tone patterns (single tone, dual tone, multi-tone, coded tones) using a single hardware platform. The multi-channel synthesis core and programmable architecture enable one device to serve multiple agencies and protocols, eliminating the need for separate hardware for each tone type.
3Adaptability or versatility
If proprietary tone sequences are used for different agencies, then each agency can have customized signaling, but cross-agency communication becomes difficult
Solution Approach 1:
The patent segments the tone generation system into modular components: a base generation engine and programmable protocol layers. This allows each agency to configure their specific tone sequences through software while maintaining a common hardware foundation, enabling both customization and interoperability.
Solution Approach 2:
The patent introduces a programmable interface layer as an intermediary between the tone generation hardware and agency-specific protocols. This software layer translates between different agency protocols and the underlying hardware, facilitating cross-agency communication while preserving proprietary signaling capabilities.
4Measurement precision
If specialized programming equipment is required to program the signal generator, then precise tone parameters can be set, but the programming process becomes difficult and time-consuming
Solution Approach 1:
The patent implements self-service programming capabilities where the signal generator can be configured through user-friendly interfaces (display and control panel) without requiring external specialized equipment. The system provides automated parameter validation and error checking, making precise programming accessible to operators without specialized training.
Data Source
AI summary
A programmable signal generator and radio controller for providing dispatch paging tone out frequencies to first responders and other selected areas. The signal generator is capable of performing tone-outs to various first responders and being cross compatible with prior and future evolutionary systems. The signal generator uses plain-text console interface and plain-text tone-out parameter definitions allowing programming without special software, apps, or Internet connectivity. The signal generator is capable of controlling operational functions of connected radio transceiver equipment including initiating and terminating RF transmission, selecting radio channel or frequency, and monitoring operational status of the transceiver. The signal generator is also capable of interactive communication with external third-party digital radio dispatch console systems via Ethernet network and TCP/IP protocol via an isolated network interoperability interface that implements a simple Application Program Interface (API).