Headset Noise Reduction via External Cavity and Dual Microphones
Solution Overview
Problem
In strong-noise environments, existing headsets fail to maintain clear voice communication and protect hearing while allowing for sensitive monitoring of the surroundings, leading to potential dangers and significant losses.
Innovation Solution
A headset communication method using an earplug and external connection cavity to reduce noise, combined with internal and external microphones for signal processing, and sound dynamic compression to enhance voice clarity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an earplug is used to block noise entering the ear canal, then hearing protection is improved, but the ability to monitor environmental sounds is worsened
Solution Approach 1:
The patent introduces an external connection cavity as an intermediary structure that provides an alternative acoustic pathway. This cavity with lower acoustic impedance allows environmental sounds to reach the eardrum while the earplug blocks direct noise entry through the ear canal, thus mediating between hearing protection and environmental monitoring needs
Solution Approach 2:
The patent segments the acoustic pathway into two separate channels: the ear canal blocked by the earplug for hearing protection, and the external connection cavity for environmental sound monitoring. This segmentation allows each channel to serve its specific function independently
2Object-affected harmful factors
If noise reduction is enhanced in strong noise environments, then hearing protection is improved, but voice communication clarity is worsened
Solution Approach 1:
The external connection cavity acts as an intermediary acoustic pathway that allows voice signals to reach the eardrum while blocking other noise. The cavity's acoustic properties are designed to favor voice frequency transmission while attenuating other noise frequencies
Solution Approach 2:
The patent applies local quality by designing the external connection cavity with specific acoustic impedance characteristics that differ from the ear canal. The cavity wall is equipped with sound-absorbing materials targeted at specific frequency ranges to selectively pass voice frequencies while absorbing noise frequencies
3Object-affected harmful factors
If the ear canal is blocked to protect hearing, then noise reduction is improved, but the natural sound transmission path is worsened
Solution Approach 1:
The patent segments the sound transmission function into two pathways: the blocked ear canal for noise reduction and the external connection cavity for reliable sound transmission. This ensures that natural sound transmission is maintained through the alternative pathway while the ear canal remains blocked for protection
Solution Approach 2:
The external connection cavity serves as an intermediary structure that restores reliable sound transmission by providing an alternative pathway around the blocked ear canal, maintaining acoustic connectivity without requiring the ear canal to be open
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 method effectively reduces noise across all frequencies, enhances voice clarity, and allows for safe monitoring of the environment, protecting hearing and ensuring effective communication.
Implementation Method 1
using an earplug closely coupled to the wearer's ear canal meatus to reduce medium and high frequency noises entering the ear canal
Implementation Method 2
using an external connection cavity extending from the earplug and constituting a parallel branch with the ear canal to divert medium and low frequency noises entering the ear canal
Implementation Method 3
a sound absorbing material is attached to the inner wall of the external connection cavity
Data Source
AI summary
The invention discloses a headset communication method under a strong-noise environment and a headset. The method comprises: using earplugs to reduce medium and high frequency noises entering an ear canal, using an external connection cavity in parallel connection with the ear canal to divert medium and low frequency noises; using an internal microphone to pick up the sound in the ear canal and an environmental noise signal entering the ear canal, using an external microphone to pick up the environmental noise signal, and taking the external microphone signal as reference signals to eliminate the noise element in the internal microphone signal and remain the voice element to obtain transmitting terminal signals of the headset; using sound dynamic compression technology to cut down and compensate the signals picked up by the external microphone in terms of sound pressure level such that the sound pressure range is compressed to a range acceptable by human ears and the signals picked up by the external microphone and the receiving terminal signal received by the headset are broadcast together through a receiver of the headset. By means of the technical scheme of the present invention, the functions of protecting hearing, enhancing voice and monitoring a three-dimensional environment can be achieved comprehensively under strong-noise environments.