Clipped Ringing Signal Detection via Waveform Continuity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detection methods for clipped ringing signals in telephone communication systems are dependent on the amplitude and frequency of the ringing signal, requiring threshold adjustments that complicate programming and increase the risk of incorrect clipping detection.
Innovation Solution
A device comprising a ringing generator, a ringing signal adjusting-and-driving section, and a voltage-detection and clipping-judgment section, which detects voltage waveform continuity to determine clipping, independent of signal amplitude and frequency, and adjusts the gain accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection methods rely on amplitude and frequency thresholds, then detection can be performed, but programming complexity increases and detection accuracy decreases
Solution Approach 1:
The patent changes the detection parameter from amplitude/frequency values to waveform continuity (derivative discontinuity). Instead of comparing signal magnitude against thresholds, the method detects clipping by identifying abrupt changes in the waveform's slope, which occurs at clipping points regardless of the signal's amplitude or frequency characteristics.
Solution Approach 2:
The patent replaces the traditional threshold-based detection mechanism with a derivative-based detection mechanism. By computing the first derivative of the waveform and detecting discontinuities, the system substitutes magnitude comparison with slope analysis, eliminating the need for amplitude and frequency threshold programming.
2Reliability
If battery feeding power is increased, then ringing signal integrity can be maintained under higher load, but power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the clipping detection system continuously monitors the ringing signal and provides information about signal integrity to the power supply control. When clipping is detected, the system can trigger power supply adjustments, creating a closed-loop control that maintains signal integrity only when necessary rather than continuously consuming high power.
Solution Approach 2:
The patent performs preliminary detection of clipping conditions before they severely degrade signal quality. By detecting the onset of clipping through derivative discontinuity analysis, the system can proactively adjust power supply levels to prevent clipping rather than reacting after significant distortion occurs, thereby maintaining integrity with minimal power increase.
Data Source
AI summary
A device for detection of a clipped ringing signal includes a ringing generator, a ringing signal adjusting-and-driving section, and a voltage-detection and clipping-judgment section. The ringing signal adjusting-and-driving section receives a ringing signal from the ringing generator. The ringing signal adjusting-and-driving section also receives a gain adjusting signal. The ringing signal adjusting-and-driving section outputs the ringing signal to a subscriber loop after adjusting the gain thereof according to the gain adjusting signal. The voltage-detection and clipping-judgment section is coupled to the subscriber loop to detect the loop voltage waveform of the subscriber loop, and to determine that the ringing signal is clipped when the loop voltage waveform is discontinuous. When the ringing signal is clipped, the voltage-detection and clipping-judgment section sends the gain adjusting signal to drive the ringing signal adjusting-and-driving section to attenuate the gain of the ringing signal.