Facsimile Line Interface Signal Detection Mode Switching
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Solution Overview
Problem
Facsimile apparatuses using semiconductor DAA cannot simultaneously detect modem signals and ring signals, requiring timely mode switching to avoid detection failure.
Innovation Solution
A facsimile apparatus with a line I/F section, modem signal detection section, ring signal detection section, and switch section that determines the operating state to selectively switch between modem and ring signal detection modes, ensuring reliable detection of either signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the semiconductor DAA uses a single detection section for both modem signals and ring signals, then the device complexity is reduced and costs are lowered, but the reliability of signal detection deteriorates because the system cannot simultaneously detect both signal types
Solution Approach 1:
The patent implements dynamic switching between detection modes using a mode switching unit that changes the detection characteristics of the semiconductor DAA based on operational requirements. The system transitions between a first detection mode (optimized for modem signals) and a second detection mode (optimized for ring signals), allowing a single detection section to reliably handle different signal types at different times without requiring multiple parallel detection sections.
2Reliability
If the facsimile apparatus uses a transformer-based detection system, then both modem signals and ring signals can be detected simultaneously with high reliability, but the device complexity increases and the apparatus size increases
Solution Approach 1:
The patent replaces the traditional transformer-based mechanical/electromagnetic detection system with a semiconductor DAA-based electronic detection system. This substitution eliminates the need for transformers and associated complex circuitry while achieving reliable detection of both modem and ring signals through electronic mode switching, thereby reducing device complexity and size while maintaining detection reliability.
Solution Approach 2:
The semiconductor DAA is configured to perform multiple detection functions by switching between different detection modes. The single detection section can operate in a first mode for detecting modem signals and in a second mode for detecting ring signals, making the system universal and multi-functional without requiring separate dedicated detection sections for each signal type.
3Ease of operation
If the detection mode is not switched at appropriate timing, then the system operation is simplified, but the signal detection precision deteriorates because the wrong detection mode may be active when a specific signal is transmitted
Solution Approach 1:
The patent implements a control unit that monitors the operational state of the facsimile apparatus and provides feedback to the mode switching unit. Based on this feedback regarding the current operational state (whether in standby, transmission, or reception mode), the control unit triggers appropriate mode switches to ensure the correct detection mode is active when specific signals are transmitted, thereby maintaining high detection precision while keeping the operation logic straightforward.
Data Source
AI summary
A facsimile apparatus has a line I/F section that transmits and receives a signal through a network to which an exchange is connected, a modem signal detection section that detects a modem signal transmitted through the network, a ring signal detection section that detects a ring signal transmitted through the network from the exchange, a switch section that switches a signal detection mode of the line I/F section between a ring signal detection mode in which the ring signal detection section detects the ring signal and a modem signal detection mode in which the modem signal detection section detects the modem signal, and an operating state determination section that determines an operating state of the facsimile apparatus, wherein if the operating state determination section determines that the facsimile apparatus is in a standby mode, the switch section switches the signal detection mode into the ring signal detection mode.