Communication Device Circuit Control for CI Signal Noise
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Solution Overview
Problem
Existing communication devices experience unpleasant noise and potential damage to electronic elements due to the CI signal flowing through circuits when starting a voice communication, as the CI signal's amplitude exceeds voice signal levels and can be audible as non-voice signals.
Innovation Solution
A communication device with a calling signal detection system that waits to close the circuit until the CI signal is detected in an OFF state, preventing the CI signal from flowing through the handset circuit and using a state detection system to differentiate between ON and OFF states based on pulse duration, ensuring the circuit is only closed when the CI signal is in the OFF state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the circuit is closed immediately when the user picks up the handset, then the communication can be started quickly, but the CI signal may flow through the handset circuit causing unpleasant noise and potential damage to electronic elements
Solution Approach 1:
The invention applies preliminary action by detecting the CI signal state before closing the circuit. The system checks whether the CI signal is in the OFF state prior to allowing circuit closure, preventing harmful CI signal flow while maintaining quick connection when safe. This advance checking mechanism resolves the contradiction by ensuring circuit closure only occurs when the CI signal will not cause damage or noise.
2Adaptability or versatility
If the circuit includes a relay for connecting the handset, then the circuit can be switched from CI detection mode to voice communication mode, but the relay switching may allow CI signal pulses to flow through the handset during the transition
Solution Approach 1:
The invention uses feedback by continuously monitoring the CI signal state and using this information to control the relay switching timing. The system only permits circuit closure when feedback indicates the CI signal is in the OFF state, preventing harmful pulses from flowing through the handset during the transition from CI detection mode to voice communication mode.
Data Source
AI summary
A communication device enables a voice communication with another communication device connected to a communication circuit network. The communication device has a calling signal detection system that detects whether a calling signal is received from the other communication device via the communication circuit network, a circuit closing system that is configured to close a circuit connecting the communication device and the other communication device when a communication starting operation is performed by a user after the calling signal detection system detects the calling signal from the other communication device, a state detection system that detects whether the calling signal currently received is in ON or OFF state, and a standby control system that controls the circuit closing system to await closing the circuit until the state detection system detects the OFF state of the calling signal if the state detection system detects the ON state of the currently received calling signal.