Auto-calibrating In-ear Headphone with Ear Canal Feedback
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Solution Overview
Problem
Existing in-ear headphones fail to provide accurate frequency responses and ambient noise transmission due to individual ear anatomy variations, leading to suboptimal sound reproduction and incomplete noise cancellation, especially in environments where background noises are necessary for safety.
Innovation Solution
An auto-calibrating in-ear headphone system that uses an integrated circuit to generate sound signals, measure ear canal characteristics, and modify audio signals based on ear drum responses and target functions, allowing for accurate sound reproduction and ambient noise integration without removing the headphones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If in-ear headphones create a closed seal with the ear canal to block environmental noises, then active noise cancellation is improved, but the user cannot hear environmental background noises necessary for safety
Solution Approach 1:
The system dynamically switches between different operational modes (noise cancellation mode and ambient sound mode) based on user needs and environmental conditions, making the noise isolation特性 adjustable rather than fixed
Solution Approach 2:
A microphone acts as an intermediary to capture environmental sounds outside the ear canal and transmit them to the user's ear, bridging the gap between the sealed ear canal and the external environment
2Ease of manufacture
If conventional headphones use flat frequency response equalization, then manufacturing complexity is reduced, but individual ear anatomy variations cause inaccurate sound reproduction
Solution Approach 1:
The system performs self-calibration by automatically measuring the user's ear canal characteristics through built-in microphones and speakers, eliminating the need for external measurement equipment or manual equalization setup
Solution Approach 2:
The system uses feedback from microphones that detect sounds played through the ear canal to automatically adjust and optimize the frequency response equalization for each user's unique ear anatomy
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 system ensures users experience intended sound frequencies and ambient noises as if not wearing headphones, with efficient active noise cancellation, addressing individual ear anatomy variations and enhancing safety in noisy environments.
Implementation Method 1
generate a sound signal and play the sound signal at a driver when the in-ear headphone is placed in a user's ear canal
Implementation Method 2
the reflected sound signal is received and recorded by a first microphone
Implementation Method 3
An integrated circuit within an in-ear headphone can generate a sound signal and play the sound signal at a driver
Implementation Method 4
generate a second sound signal from an audio input and modify the second sound signal based on the user's ear drum response
Implementation Method 5
in-ear headphones are known to provide high quality sound to a user by creating a closed seal with the ear drum and the outside world, thereby blocking out most environmental or background noises
Data Source
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AI summary
A method for calibrating an in-ear headphone to improve the frequency response heard by a user. The method including generating a sound signal and playing the sound signal at a driver when the in-ear headphone is placed within a user's ear canal, receiving a reflected sound signal at a first microphone, generating a frequency response based on the reflected sound signal, generating the user's ear drum response based on the frequency response, generating a second sound signal, modifying the second sound signal based on the user's ear drum response, and playing the modified second sound signal at the driver.