Vehicle Emergency Report Diagnostic Modulation
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Solution Overview
Problem
Conventional emergency report apparatuses in vehicles may cause discomfort to occupants due to the use of diagnostic sounds at audible frequencies when diagnosing loudspeaker defects, which can be exacerbated by noise interference in damaged vehicles.
Innovation Solution
The emergency report apparatus modulates diagnostic data using a carrier wave outside the voice band, making the diagnostic sound inaudible to occupants and reducing discomfort, and includes a notification voice output to confirm the functionality of the voice output instrument without causing discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DTMF sound or other diagnostic sound is output from the loudspeaker at audible frequencies, then the diagnostic sound can be detected by the microphone for determining loudspeaker functionality, but the diagnostic sound becomes hearable by the occupant and causes discomfort
Solution Approach 1:
The patent changes the frequency parameter of the diagnostic sound from the audible range to the ultrasonic range (above 20kHz). This allows the diagnostic sound to remain detectable by the microphone for determining loudspeaker functionality while becoming inaudible to the human occupant, thereby eliminating the discomfort caused by audible diagnostic sounds.
2Reliability
If the vehicle is damaged and loudspeakers become defective, then the occupant cannot converse with the emergency report center operator, but providing a backup loudspeaker increases device complexity
Solution Approach 1:
The system performs self-diagnosis by having the loudspeaker output a diagnostic sound that is detected by the microphone. The processor determines whether the loudspeaker is functioning normally based on the detected sound. This self-service diagnostic capability allows the system to identify defective loudspeakers and switch to backup loudspeakers automatically, maintaining emergency communication reliability without requiring complex manual diagnosis procedures.
3Measurement precision
If diagnostic sound is output at high volume to ensure detection, then the diagnostic function is reliable, but the sound becomes more noticeable and uncomfortable to the occupant
Solution Approach 1:
The patent changes the frequency parameter of the diagnostic sound to the ultrasonic range (above 20kHz). This allows the diagnostic sound to be output at sufficient volume for reliable detection by the microphone while remaining inaudible to the human occupant, thereby simultaneously achieving detection reliability and eliminating occupant discomfort.
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
The solution effectively determines the functionality of voice output instruments without causing discomfort to vehicle occupants, ensuring reliable emergency communication even in noisy conditions by using inaudible diagnostic frequencies and clear notification voices.
Implementation Method 1
The modulation section modulates preselected diagnostic data based on preselected diagnostic modulation data by using a diagnostic carrier wave having preselected carrier wave frequency
Data Source
AI summary
In an emergency report apparatus, diagnostic data is modulated based on a preselected diagnostic modulation method by using a diagnostic carrier wave having a carrier wave frequency that is set within a range of frequencies detectable by a vehicle-mounted voice input instrument and is outside a voice band. A diagnostic electric signal is outputted to a voice output instrument. Demodulated data is generated by demodulating an input voice electric signal being a voice electric signal representing a voice detected by the voice input instrument based on a preselected diagnostic demodulation method. It is determines whether the demodulated data includes data that matches the diagnostic data.