Communication Apparatus Oscillation Suppression via Dynamic DC Mask
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Solution Overview
Problem
Communication apparatuses connected to public line networks experience oscillations within specific frequency bandwidths (20 kHz to 1 MHz), leading to noise generation and echo cancellation malfunctions, which existing technologies fail to adequately address.
Innovation Solution
A communication apparatus with a line control unit, detection circuit, memory unit, adjusting unit, and oscillation detection circuit that stores multiple voltage-current characteristic curves, allowing for real-time adjustment of line voltage and current based on selected curves to prevent oscillations by switching between different DC mask curves corresponding to detected oscillation frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the line current and line voltage are adjusted based on a predetermined DC mask curve to meet public line standards, then the communication quality is improved, but oscillation occurs in the network causing noise and echo cancellation malfunction
Solution Approach 1:
The patent implements a feedback mechanism by detecting oscillation in the communication network and automatically switching between multiple DC mask curves based on the detected oscillation state. The system monitors the network condition and adjusts the voltage-current characteristic curve selection dynamically, creating a closed-loop control system that eliminates oscillation while maintaining communication quality standards.
Solution Approach 2:
The patent transforms the static DC mask curve selection into a dynamic system by introducing multiple voltage-current characteristic curves that can be switched based on network conditions. Instead of using a single fixed curve, the system adapts the curve selection in real-time according to detected oscillation, making the impedance adjustment process dynamic and responsive to network state changes.
2Object-generated harmful factors
If multiple voltage-current characteristic curves are stored and switched based on oscillation detection, then oscillation is suppressed, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by storing multiple DC mask curves with different voltage-current characteristic parameters in a lookup table. Instead of implementing complex real-time calculation algorithms, the system changes the operational parameters by selecting from pre-stored curves, simplifying the control logic while effectively suppressing oscillation through parameter switching.
Solution Approach 2:
The patent uses a cost-effective approach by implementing oscillation detection and curve switching through software control rather than expensive hardware modifications. The system uses existing detection capabilities and simple lookup table storage, avoiding complex additional hardware circuits while achieving oscillation suppression through intelligent control algorithms.
Data Source
AI summary
In a communication apparatus has a line control unit that controls connection with a communication line network, a communication unit transmits/receives data through the communication line network. A detection circuit detects one of a line voltage value and a line current value when the communication apparatus is connected to the line network. A memory unit stores multiple voltage-current characteristic curves defining relationships of line voltage values with respect to line current values satisfying a predetermined standard. An adjusting unit adjusts the line voltage value and the line current value so as to satisfy the predetermined standard based on one of the voltage-current characteristic curves stored in the memory unit. A selecting unit selects another voltage-current characteristic curve different from the one of the voltage-current characteristic curves from among the multiple voltage-current characteristic curves stored in the memory unit. A re-adjusting unit adjusts one of the line voltage and a line current.