Communication Apparatus Connection State Detection via Voltage Analysis
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Solution Overview
Problem
Existing communication apparatuses struggle to accurately determine correct connection states between telephone and line connection terminals due to similar terminal shapes leading to incorrect connections, and existing methods fail to differentiate between correct and incorrect connections, especially when capacitance elements are charged, causing voltage discrepancies that result in erroneous detection.
Innovation Solution
A communication apparatus with a control unit, modem unit, identification unit, switching unit, and determination units that measure and analyze voltage changes to differentiate between correct and incorrect connections by determining if the voltage decreases after disconnection, using a threshold value and multiple voltage measurements to determine the connection state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage comparison method is used to detect connection state, then connection detection is simplified, but detection accuracy deteriorates when capacitance elements are charged
Solution Approach 1:
The patent applies preliminary action by performing multiple voltage measurements at different time points (immediate measurement after disconnection, and subsequent measurements after a predetermined time interval) before making a final connection state determination. This multi-stage measurement approach allows the system to account for capacitance discharge effects while maintaining a relatively simple detection mechanism.
Solution Approach 2:
The patent implements feedback by comparing voltage values measured at different time points and using this comparison to determine the connection state. The system measures voltage immediately after disconnection, waits for a predetermined time, measures again, and uses the change (or lack of change) in voltage to feedback-based determination of whether a correct or incorrect connection was made, thereby improving accuracy without significantly increasing device complexity.
2Ease of operation
If line voltage is used for connection determination, then detection is straightforward, but reliability deteriorates in private branch exchange environments with low voltage
Solution Approach 1:
The patent replaces the mechanical/voltage-based determination method with an electronic measurement and comparison system. Instead of relying solely on absolute voltage thresholds that fail in low-voltage PBX environments, the system uses electronic voltage measurements at different time points, compares the change in voltage, and makes determination based on this dynamic comparison, thereby maintaining reliability across different voltage environments while keeping the operation straightforward.
3Device complexity
If single voltage measurement is performed, then measurement process is simple, but precision deteriorates due to capacitance element charge state
Solution Approach 1:
The patent applies preliminary action by performing multiple voltage measurements at different time points (immediate measurement after disconnection, and subsequent measurements after a predetermined time interval) before making a final connection state determination. This multi-stage measurement approach allows the system to account for capacitance discharge effects while maintaining a relatively simple detection mechanism.
Solution Approach 2:
The patent implements periodic action by measuring voltage at regular time intervals (immediately after disconnection, then after a predetermined time period, and potentially additional periodic measurements). This periodic measurement strategy enables the system to observe voltage changes over time and distinguish between correct and incorrect connections based on the discharge pattern, improving precision without significantly complicating the measurement process.
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
Accurately detects correct or incorrect connections, reducing erroneous detection and improving connection state accuracy, even when capacitance elements are charged, by analyzing voltage changes and threshold values, thereby preventing misidentification of connection states.
Implementation Method 1
a telephone to be connected to the telephone connection terminal typically includes an element (hereinafter referred to as "capacitance element") having a capacitance component, such as a capacitor or varistor
Implementation Method 2
the capacitance element is charged by a line voltage supplied from the telephone line to a value (for example, 48 V) close to the line voltage
Data Source
AI summary
A communication apparatus includes: a first determination unit configured to determine whether a first voltage identified under conditions where a telephone connection terminal is connected to a modem unit is greater than or equal to a first threshold value; a second determination unit configured to, if the first determination unit determines that the first voltage is greater than or equal to the first threshold value, determine whether a second voltage identified under conditions where the telephone connection terminal is disconnected from the modem unit tends to decrease; and a third determination unit configured to determine connection states of the telephone connection terminal and a line connection terminal based on determination results of the first determination unit and the second determination unit. If the second determination unit determines that the identified second voltage has decreased more than once, the third determination unit determines that a wrong connection has been made.