Phone Test Set Modem for Bi-directional Data Communication
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Solution Overview
Problem
Phone test sets lack the capability for bi-directional alphanumeric data communication with other devices connected to the phone line, limiting their functionality in digital communication.
Innovation Solution
Incorporating modem functionality into the phone test set to enable digital communication, using a processor with modulator/demodulator capabilities, and implementing an FM discriminator and universal synchronous/asynchronous receiver/transmitter (USART) to facilitate bi-directional ASCII data transmission and reception over the phone line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If modem functionality is incorporated into the phone test set, then digital communication capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the modem functionality directly into the existing phone test set device, merging voice communication and data communication capabilities into a single integrated unit. This allows the test set to perform both traditional telephone operations and digital data transmission without requiring separate equipment.
Solution Approach 2:
The modified phone test set becomes a multi-functional device that can handle both voice calls and alphanumeric data communication. The modem capability enables the same device to serve dual purposes: traditional telephone testing and digital data exchange, increasing its versatility and adaptability.
2Adaptability or versatility
If bi-directional alphanumeric data communication is added, then functionality is enhanced, but ease of operation deteriorates
Solution Approach 1:
The patent introduces a microprocessor as an intermediary component that manages the complex data communication protocols. The microprocessor handles the modulation and demodulation of signals, as well as the coordination of data transmission, shielding the user from the complexity of digital communication operations.
Solution Approach 2:
The patent replaces manual operational procedures with automated microprocessor-controlled systems. Instead of requiring users to manually manage data transmission protocols, the system automatically handles modulation, demodulation, and data routing, simplifying the user interface and operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the phone test set to function as a bi-directional alphanumeric data terminal, allowing for remote communication of commands and control data, enhancing its capabilities beyond traditional telephone operations.
Implementation Method 1
a modulator for modulating audio frequency signals from the processor onto carrier frequencies for transmission on the phone line
Implementation Method 2
a demodulator for demodulating incoming signals from the phone line to data for the processor
Implementation Method 3
The incoming signal is supplied to an FM discriminator, the output of which is supplied to a low pass filter
Data Source
AI summary
A phone test set provides modem capability in a hand held device, enabling bi-directional data communications. Demodulation is provided by sampling digitized incoming phone line signals at 4 times carrier frequency, and employing values representing 0 and 90 degree samples to extract the information signal.