Ultrasonic Audio Fallback for Portable Device Speaker Reliability
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Solution Overview
Problem
In public-safety or mission-critical environments, portable communication devices face challenges when remote audio devices malfunction, leading to inability to hear or be notified of incoming communications due to damaged components or depleted batteries, which existing systems fail to address effectively without user intervention.
Innovation Solution
The system configures a portable communication device to generate an ultrasonic audio signal, mix it with incoming audio, and compare the remote audio signal's level to thresholds to determine if a compensated audio signal should be output, enabling fallback to local components for audio detection and notification, without requiring user intervention or hardware modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the system relies on remote audio devices for audio output and input, then communication range and mobility are improved, but reliability deteriorates when remote devices malfunction or are battery-depleted
Solution Approach 1:
The system performs fault detection before complete communication failure occurs by monitoring audio signal characteristics (amplitude, signal-to-noise ratio) from the remote audio device. When degradation is detected, the system proactively activates fallback mode using the portable device's local speaker and microphone, ensuring continuous communication without waiting for total failure.
Solution Approach 2:
The portable communication device serves as an intermediary between the remote audio device and the communication system. It monitors the remote device's audio performance and mediates the transition between remote and local audio paths, seamlessly switching to local components when remote devices become unreliable.
2Reliability
If the system automatically detects and responds to remote audio device faults, then reliability is improved, but device complexity increases due to additional monitoring and control mechanisms
Solution Approach 1:
The system uses the remote audio device's own audio output as the monitoring signal to detect its health status. The portable device analyzes the audio signal characteristics (amplitude, signal-to-noise ratio) from the remote speaker to determine if the device is malfunctioning or battery-depleted, eliminating the need for separate sensor systems.
Solution Approach 2:
The system continuously monitors audio signal characteristics from the remote audio device and uses this feedback to dynamically adjust the communication path. When audio quality deteriorates beyond thresholds, the system automatically switches to local audio components, creating a closed-loop control system that responds to real-time conditions.
3Reliability
If the system switches to local speaker for audio output when remote device fails, then reliability is improved, but audio quality and loudness may deteriorate due to different acoustic characteristics
Solution Approach 1:
The system dynamically adjusts audio parameters (gain, equalization, compression) when switching between remote and local audio paths. The portable device modifies the audio signal characteristics to compensate for differences in speaker efficiency, acoustic environment, and signal path, maintaining consistent audio quality across both modes.
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
This approach dynamically adjusts the local speaker's volume to compensate for audio loss, enabling continuous communication and notification even when remote audio devices are defective or battery-depleted, without modifying existing hardware, and provides automatic fault detection and notification.
Implementation Method 1
generate an ultrasonic audio signal, mix the ultrasonic audio signal with the incoming audio signal to generate a mixed audio signal
Data Source
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AI summary
Methods and apparatus for configuring a portable communication device are disclosed. The methods include receiving an incoming audio signal, adjusting the incoming signal audio level based on a volume control setting, generating an ultrasonic audio signal having an audio level independent of the volume control setting, mixing the incoming signal with the ultrasonic signal to generate a mixed audio signal, outputting the mixed signal to a remote audio device, receiving a remote audio signal from the remote device, and comparing the remote signal audio level to one or more thresholds to determine whether to output a compensated audio signal to a speaker. The remote signal may be detected by the remote device in response to sound output from the remote device based on the mixed signal, and the compensated signal audio signal may be adjusted based on an estimated loss in loudness associated with the remote signal audio level.