Audio Output Adaptation Using Acoustic Feedback for Ringtone Audibility
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Solution Overview
Problem
Existing audio devices, such as mobile phones, face challenges in automatically adapting ringtone volume to ambient noise levels due to high acoustic coupling between speakers and microphones, leading to incorrect noise estimations and inadequate alert notification in varying environments.
Innovation Solution
A method that monitors and measures the relation between audio output and input signals to adapt the audio device's behavior, using adaptive filtering and sensor data to determine the acoustic environment and adjust the audio output signal accordingly, allowing for ambient-aware volume adjustments and notification enhancements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ringtone volume is increased to be audible in noisy environments, then the alert becomes audible in noisy conditions, but the ringtone becomes too loud in quiet environments
Solution Approach 1:
The system dynamically changes the volume parameter of the ringtone based on detected acoustic environmental conditions. By continuously monitoring ambient noise levels and adjusting the playback volume accordingly, the system ensures the ringtone is audible in noisy environments while maintaining appropriate volume levels in quiet settings, thus resolving the contradiction between reliability and harmful effects.
2Ease of operation
If manual volume adjustment or profile switching is implemented, then the user can control ringtone volume, but user interaction is required which people tend to forget
Solution Approach 1:
The system performs self-service by automatically detecting acoustic environmental conditions and adjusting the ringtone volume without requiring user intervention. The acoustic sensor continuously monitors the environment and the processor autonomously adapts the playback parameters, eliminating the need for manual volume adjustment or profile switching while maintaining optimal audibility.
3Reliability
If automatic volume increase over time is implemented, then the ringtone becomes loud enough eventually, but only the last part is audible and the alert may be missed
Solution Approach 1:
The system takes preliminary action by proactively detecting acoustic environmental conditions before the ringtone plays and pre-adjusting the volume to appropriate levels. This eliminates the need for gradual volume increase over time, ensuring the alert is immediately audible at the correct volume from the start, thus preventing loss of time and ensuring the user hears the notification promptly.
4Difficulty of detecting and measuring
If ambient light sensor or proximity sensor is used to detect environment, then some environmental information is obtained, but the information is not conclusive for distinguishing covered vs. dark environments
Solution Approach 1:
The system introduces an intermediary acoustic sensor that directly measures the acoustic environmental conditions relevant to ringtone audibility. Unlike optical or proximity sensors that provide indirect and ambiguous information, the acoustic sensor directly detects ambient noise levels, providing conclusive and precise measurements for accurate environment classification and appropriate volume adjustment.
5Measurement precision
If noise level is measured before audio playback, then the noise level can be estimated, but variations in environmental noise after playback starts cannot be dealt with
Solution Approach 1:
The system implements continuous feedback by monitoring acoustic environmental conditions throughout the ringtone playback period. The acoustic sensor continuously measures ambient noise levels and the processor dynamically adjusts the playback volume in real-time based on these feedback measurements, enabling the system to respond to environmental noise variations during playback and maintain optimal audibility throughout.
Data Source
AI summary
It is described a method for controlling an adaptation of a behavior of an audio device (100) to a current acoustic environmental condition. The method comprises (a) monitoring an audio output signal (x(t), x′(t)) being provided to an acoustic output device (110) of the audio device (100) for outputting an acoustic output signal, (b) measuring an audio input signal (z(t)) being provided by an acoustic input device (120) of the audio device (100), wherein the audio input signal (z(t)) is indicative for a feedback portion of the acoustic output signal and for the current acoustic environmental condition, (c) determining a relation between the audio output signal (x′(t)) and the audio input signal (z(t)) and (d) adapting the behavior of the audio device (100) based on the determined relation. Further, it is described a data processor, a computer-readable medium and an audio device, which are adapted to control and/or to carry out the above mentioned method for controlling an adaptation of the behavior of an audio device (100) to a current acoustic environmental condition.