Dynamic Microphone Selection for Mobile Voice Noise Reduction
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Solution Overview
Problem
Current dual microphone noise reduction technologies in mobile terminals often filter out useful sounds due to the close proximity of microphones, affecting voice communication quality and reducing noise reduction effectiveness.
Innovation Solution
A method and apparatus that select a communicating microphone and a noise reducing microphone from a voice headphone and a built-in microphone, creating a distance between them to reduce noise while minimizing the filtering of useful voice information, using audio signal energy comparison to determine the optimal microphone configuration, and performing noise reduction and voice coding to generate an improved audio output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two microphones are placed close together in a mobile terminal for dual microphone noise reduction, then the device size is reduced and manufacturing is simplified, but useful sounds are filtered along with noise, affecting voice communication quality
Solution Approach 1:
The patent dynamically switches between different microphone configurations (first configuration with first and second microphones, second configuration with third and fourth microphones) based on environmental noise conditions. This dynamic adaptation allows the system to maintain effective noise reduction while preserving useful voice information by selecting the optimal microphone pair for current conditions.
Solution Approach 2:
The system changes operational parameters by switching between different microphone configurations and adjusting noise reduction processing based on detected environmental conditions. This parameter change enables the system to optimize the balance between noise reduction effectiveness and preservation of useful voice information.
2Device complexity
If two microphones are placed close together for noise reduction, then device complexity is reduced, but noise reduction effectiveness is weakened due to filtering of useful sounds
Solution Approach 1:
The patent divides the noise reduction function into multiple segments by implementing multiple microphone configurations (first and second configurations with different microphone pairs). Each configuration is optimized for specific scenarios, and the system segments the noise reduction task by selecting appropriate configurations based on environmental conditions, thereby improving overall noise reduction reliability.
Solution Approach 2:
The system uses a composite approach by combining multiple microphone configurations and selectively applying different noise reduction processing methods. This composite structure allows the system to leverage the strengths of different microphone arrangements to achieve reliable noise reduction across various environmental conditions.
3Object-affected harmful factors
If noise reduction processing is applied to audio signals from closely placed microphones, then noise is reduced, but voice communication quality deteriorates due to loss of useful sounds
Solution Approach 1:
The system performs preliminary actions by detecting environmental noise conditions before applying noise reduction processing. Based on the detected conditions, it pre-selects the appropriate microphone configuration and processing method, thereby preventing the loss of useful voice information while effectively reducing ambient noise.
Solution Approach 2:
The system uses feedback by continuously monitoring environmental conditions and adjusting the noise reduction processing accordingly. The detection unit detects ambient noise levels and the processing unit adapts the noise reduction algorithm based on this feedback, ensuring that useful voice information is preserved while effectively reducing harmful ambient noise.
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 enhances voice communication quality by effectively reducing noise while preserving useful voice information, improving noise reduction efficacy and user experience, and reduces the need for multiple embedded microphones, thus lowering production costs.
Implementation Method 1
one for clear voice communication and the other for active physical noise reduction where ambient sounds are collected and processed and then a sound wave with an inverted phase to the noise is generated to reduce the noise by using an offsetting principle
Data Source
AI summary
The present invention discloses a method and an apparatus for reducing noise in voices of a mobile terminal and relates to the field of communications technologies, which can improve the effect of noise reduction. The method includes: selecting, from a voice headphone and a microphone built in the mobile terminal, a current communicating microphone and a current noise reducing microphone; obtaining an audio signal received by the current communicating microphone and an audio signal received by the current noise reducing microphone; performing noise reduction according to the audio signal received by the current communicating microphone and the audio signal received by the current noise reducing microphone, so as to obtain a noise reduced signal; and performing voice coding according to the noise reduced signal to generate an audio output signal.