Communication Apparatus Line Impedance Control Oscillation
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Solution Overview
Problem
Existing communication apparatuses face issues with line voltage oscillation due to ringer impedance control, particularly when high inductors are inserted or during pulse dialing, which can affect line facilities and increase costs by requiring different impedance values for compliance with country-specific standards.
Innovation Solution
An apparatus with a first controller to manage line impedance, a detecting unit for ringing signals, and a determining unit to dynamically enable or disable impedance control based on the state of the external telephone, preventing oscillation by validating or invalidating impedance control accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ringer impedance control is continuously activated to ensure compliance with country standards, then compliance with line standards is improved, but line voltage oscillation occurs causing harmful effects on line facilities
Solution Approach 1:
The patent applies dynamics by making the impedance control function movable rather than fixed. The first controller dynamically switches the impedance control function between active and inactive states based on detected conditions (ringing signal presence and telephone line capture status). This dynamic adjustment allows the system to maintain compliance when needed while preventing harmful oscillations during normal operation, directly resolving the technical contradiction between reliability and harmful effects.
2Reliability
If different impedance values are used for different countries to meet local standards, then compliance with country-specific standards is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the impedance parameter through control signals rather than using different physical components for different countries. The first controller changes the impedance parameter value based on the operational state (active during ringing, inactive during normal operation), allowing a single circuit substrate to comply with various country standards without requiring different hardware configurations, thereby reducing device complexity and manufacturing costs.
Data Source
AI summary
An apparatus which accepts a connection of an external telephone and connects to a telephone line includes a first controller configured to control line impedance via the telephone line, a detecting unit configured to detect a ringing signal received from the telephone line, a determining unit configured to determine whether the external telephone captures a telephone line, and a second controller configured to invalidate the control over line impedance by the first controller in a case where the apparatus is a standby state and validate the suppression of the control over ringer impedance by the first controller in a case where the detecting unit detects the ringing signal and the determining unit determines that the external telephone does not capture a telephone line.