Open Audio Volume Control for Ambient Noise and Low Leakage
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Solution Overview
Problem
Conventional audio devices, such as headsets and earbuds, obstruct the ear canal and inhibit users from hearing ambient noise, making it difficult to interact socially and requiring manual volume adjustments based on changing environments.
Innovation Solution
An open audio device with a processor, microphone, and speaker that automatically adjusts sound pressure levels based on detected ambient noise, ensuring the audio output is greater than ambient noise by a threshold amount, minimizing leakage and providing a seamless listening experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional headsets and earbuds create a seal in the ear canal, then audio output is improved and noise isolation is enhanced, but the user cannot hear ambient noise and social interaction is inhibited
Solution Approach 1:
The audio device is divided into two functional paths: an open acoustic path that allows ambient noise to reach the ear, and a separate audio transmission path that delivers audio signals without blocking the ear canal. This segmentation enables simultaneous audio playback and ambient awareness.
Solution Approach 2:
A microphone is introduced as an intermediary to capture ambient noise and feed it to a processor, which then adjusts the audio output level accordingly. This mediator enables the system to automatically adapt to ambient conditions without blocking the ear canal.
2Reliability
If manual volume adjustment is required for changing ambient noise levels, then audio output can be optimized for different environments, but user convenience is reduced and operation becomes complex
Solution Approach 1:
The audio device automatically monitors ambient noise levels through the microphone and autonomously adjusts the audio output volume without requiring user intervention. The system serves itself by detecting environmental conditions and making real-time volume adjustments to maintain optimal audio levels.
Solution Approach 2:
A feedback loop is established where the microphone continuously monitors ambient noise, the processor compares the detected noise level with the current audio output level, and automatically adjusts the volume to maintain a consistent difference. This closed-loop control eliminates manual adjustment needs.
3Object-affected harmful factors
If open audio devices are used to allow ambient noise perception, then social interaction is improved, but audio leakage to others increases
Solution Approach 1:
The audio device dynamically adjusts its output volume based on real-time ambient noise conditions. In noisy environments, the device increases volume to ensure adequate audio output, while in quiet environments, it automatically reduces volume to minimize audio leakage to surrounding people.
4Adaptability or versatility
If automatic sound pressure level adjustment is implemented, then adaptability to ambient noise is improved, but device complexity and processing requirements increase
Solution Approach 1:
The system changes the sound pressure level parameter of the audio output based on detected ambient noise conditions. By monitoring the ambient noise level and adjusting the audio output level accordingly, the system achieves automatic adaptation without complex algorithms, simply modifying the audio signal's amplitude parameter in response to environmental conditions.
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 allows users to comfortably hear audio while being aware of their surroundings, reducing manual volume adjustments and minimizing audio leakage to others, with efficient processing that conserves battery life and maintains accurate noise detection without the need for echo cancellers.
Implementation Method 1
a microphone configured to detect the ambient noise
Implementation Method 2
a speaker configured to output an audio signal
Data Source
AI summary
Methods and apparatus are provided for automatically adjusting, by an audio device, the SPL of its audio output. As described herein, the SPL is adjusted based on detected ambient noise. According to aspects, audio device iteratively adjusts the SPL based on the ambient noise. According to aspects, the SPL is adjusted to be greater than the ambient noise by a threshold SPL amount. According to aspects, the audio device outputs sound in substantially a first direction and the microphone detects sound substantially outside of the first direction. The adjusted sounds are output by the audio device.