Adaptive CNG Signal Detection in Facsimile Apparatuses
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Solution Overview
Problem
Existing facsimile apparatuses face difficulties in accurately detecting the Calling (CNG) signal due to interference from Outgoing Messages (OGM) in the TEL answering mode, leading to improper detection of the CNG signal across different operation modes.
Innovation Solution
A facsimile apparatus that determines its operation mode and uses either a band-pass filter or both band-pass and band-reject filters to detect the CNG signal, depending on the mode, ensuring accurate detection by selecting the appropriate filter configuration based on the reception mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both band-pass filter and band-reject filter are used to detect CNG signal, then detection accuracy in FAX/TEL mode is improved, but false detection occurs in TEL answering mode due to OGM interference
Solution Approach 1:
The patent applies dynamics by making the filter configuration adaptive rather than fixed. The system dynamically switches between using only a band-pass filter and using both band-pass and band-reject filters based on the detected operation mode (TEL answering mode vs. FAX/TEL mode). This dynamic adaptation resolves the contradiction by allowing the detection system to optimize its filter configuration for each specific mode, improving accuracy in FAX/TEL mode while preventing false detections in TEL answering mode.
Solution Approach 2:
The patent changes the parameter of filter configuration based on the operation mode. When in FAX/TEL mode, the system uses both band-pass and band-reject filters to achieve high detection accuracy. When in TEL answering mode, the system switches to using only a band-pass filter to avoid false detections caused by OGM signals. This parameter change approach allows the system to maintain both high accuracy and reliability across different operational contexts.
2Reliability
If only band-pass filter is used for CNG detection, then false detection is avoided in TEL answering mode, but detection accuracy decreases in FAX/TEL mode
Solution Approach 1:
The system dynamically adjusts the filter configuration based on the operation mode. In TEL answering mode, it uses only a band-pass filter to ensure reliability and avoid false detections from OGM signals. In FAX/TEL mode, it switches to using both band-pass and band-reject filters to maximize detection accuracy. This dynamic switching resolves the contradiction between reliability and precision by optimizing the filter setup for each specific operational context.
Solution Approach 2:
The patent changes the detection parameter (filter configuration) according to the operation mode. For TEL answering mode, the parameter is set to use only band-pass filter to maintain reliability. For FAX/TEL mode, the parameter is changed to use both band-pass and band-reject filters to achieve higher precision. This parameter adaptation allows the system to excel in both modes without compromise.
3Device complexity
If a fixed detection method is used for CNG signal, then device complexity is reduced, but detection accuracy varies across different operation modes
Solution Approach 1:
The patent implements a universal detection system that can adapt to multiple operation modes (TEL answering mode and FAX/TEL mode) through a single integrated approach. The system uses a mode determination unit to identify the current operation mode and then selects the appropriate filter configuration accordingly. This multi-functionality allows one detection system to serve multiple purposes with high accuracy in each mode without requiring separate detection systems for each mode, thus maintaining simplicity while achieving precision.
Solution Approach 2:
The system introduces dynamic adaptability to a previously static detection method. By adding a mode determination unit and conditional filter selection logic, the system transforms from a fixed, simple detection method to a dynamic one that automatically adjusts its configuration based on the operation mode. This dynamic enhancement maintains relatively low complexity while dramatically improving detection accuracy across different modes.
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
This approach enhances the accuracy of CNG signal detection by adapting filter usage to the specific operation mode, effectively distinguishing the CNG signal from interfering signals like OGM, thereby ensuring reliable facsimile communication initiation.
Implementation Method 1
a band-pass filter unit that detects a signal of a frequency band corresponding to a frequency band of the CNG signal
Implementation Method 2
a band-reject filter unit that detects a signal of a frequency band other than a frequency band corresponding to a frequency band of the CNG signal
Data Source
AI summary
There is a need to provide a technique of accurately detecting an identification signal representing that the partner performs facsimile communication, by using an appropriate detection filter in accordance with the operation mode in a facsimile apparatus. Based on whether the FAX/TEL mode (first mode) or the TEL answering mode (second mode) is set as the operation mode, a facsimile apparatus according to this invention determines whether a band-pass filter and band-reject filter are to be used. The facsimile apparatus detects a CNG based on the signal detection result using the determined filter.