Vehicle Call Device Echo Cancellation for Emergency Detection
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Solution Overview
Problem
Emergency call systems in vehicles often malfunction in critical situations due to microphone issues or occupant injury, leading to delayed problem detection and increased costs with existing solutions.
Innovation Solution
A vehicle call device with an echo canceller unit that can be turned off to determine microphone problems, a receiving unit for preventing echo cancellation, and a voice level detecting unit to automatically assess response levels, minimizing cost and time in emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the echo canceller unit is activated to remove received voice from microphone input, then communication quality is improved, but the ability to detect device problems is worsened
Solution Approach 1:
The echo canceller unit is designed to dynamically change its operation state based on situational needs. During normal communication, it is activated to improve call quality by removing echo. During emergency situations, it is deactivated to allow operators to detect device problems by hearing the played-back voice through the microphone, thus resolving the contradiction between communication quality and detectability
2Difficulty of detecting and measuring
If additional elements are mounted to handle fixed voice message comparison, then device problem detection capability is improved, but cost is increased
Solution Approach 1:
The echo canceller unit, which is already a necessary component for normal communication operations, is made to serve a dual function: improving communication quality during normal operations and enabling device problem detection during emergencies when deactivated. This eliminates the need for separate dedicated detection components, thus improving detection capability without increasing device complexity or cost
Solution Approach 2:
The system uses its existing communication components (speaker, microphone, echo canceller) to perform self-diagnosis. By playing a fixed voice through the speaker and listening through the microphone with echo cancellation disabled, the system can autonomously detect whether its communication hardware is functioning properly, without requiring external diagnostic equipment
3Difficulty of detecting and measuring
If decision process is performed to determine voice correspondence, then device problem detection is improved, but time consumption is increased
Solution Approach 1:
The system implements immediate feedback by playing a fixed voice through the speaker and directly listening for its echo through the microphone. The operator can instantly determine device functionality by hearing whether the played voice is captured, providing rapid detection without requiring complex processing or analysis time
Data Source
AI summary
A vehicle call device, a call system, a center, and a calling method capable of detecting a problem while controlling the cost increase are disclosed. The vehicle call device includes a speaker mounted in a vehicle, the speaker outputting a received voice of an opposite communication party; a microphone mounted in the vehicle; an echo canceller unit removing the received voice that has been output from the speaker and input into the microphone; a detecting unit detecting an emergency situation of the vehicle; and a remove preventing unit preventing the eco canceller unit from removing the received voice when the detecting unit detects the emergency situation.