Facsimile Off-Hook Detection During Ringing Mode
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Solution Overview
Problem
Conventional facsimile apparatuses in ringing mode face issues with power supply interruption during dialing, leading to incorrect off-hook detection and cancellation of dial inputs, preventing users from making desired phone calls.
Innovation Solution
A facsimile apparatus with a detection unit, switching unit, and processor that maintains power supply to the telephone device even when disconnected from the line, allowing off-hook detection and enabling dial input during ringing mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay is turned on to disconnect the handset from the telephone line before dialing in ringing mode, then the dial signal output is not affected by the handset, but the power supply to the handset is interrupted causing incorrect off-hook detection
Solution Approach 1:
The patent introduces an off-hook detection unit that operates independently of the relay switching state. This detection unit continuously monitors the handset state through the switching unit, serving as an intermediary that allows accurate off-hook detection even when the relay disconnects the handset from the telephone line. The detection unit receives signals from the switching unit to determine handset state without requiring direct telephone line connection.
2Loss of energy
If the internal power supply is turned off in ringing mode to save power, then power consumption is reduced, but the off-hook detection unit cannot operate causing misrecognition of handset state
Solution Approach 1:
The patent implements preliminary action by having the controller turn on the internal power supply in advance when an off-hook state is detected, before dialing operations are performed. This ensures that the off-hook detection unit and other necessary components are powered and operational when needed, preventing misrecognition of handset state while still allowing the system to remain in low-power mode during normal standby.
Solution Approach 2:
The patent applies dynamics by making the internal power supply state changeable based on operational requirements. The power supply transitions from off (power-saving state) to on (operational state) when dialing is detected or initiated, and can return to off when not needed. This dynamic power management allows the system to balance power consumption with functional requirements.
3Manufacturing precision
If the relay is turned on to disconnect the handset during dialing, then dial signal waveform is not affected, but the current for off-hook detection is disconnected causing dial input cancellation
Solution Approach 1:
The patent uses the switching unit as an intermediary that provides separate signal paths for different functions. The switching unit can disconnect the handset from the telephone line for clean dial signal transmission while simultaneously maintaining the connection between the off-hook detection unit and the handset through a different path. This allows the system to achieve both waveform quality and operational continuity.
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
Enables users to take the handset off-hook and input dial numbers without power supply interruption, preventing misrecognition and allowing successful phone calls while maintaining low power consumption.
Implementation Method 1
a direct current is supplied from inside the multi-function peripheral instead, and an off-hook of the handset is detected
Implementation Method 2
In the non-ringing mode, a relay is used, and, by turning the relay on, control for disconnecting the handset from the telephone line is performed
Implementation Method 3
a direct current is supplied from inside the multi-function peripheral instead, and an off-hook of the handset is detected
Data Source
AI summary
The facsimile apparatus of the present invention, and the method of controlling the same, switches a connection between a telephone device and a telephone line between connected and cut off, has a power supply for supplying power to the telephone device, and, in a state where the telephone device and the telephone line are connected and supply of power from the power supply to the telephone device is stopped, in a case that an off-hook of the telephone device is detected by a detection unit for detecting an off-hook and an on-hook of the telephone device, controls to start supply of power from the power supply to the telephone device.