Active Noise Reduction Using Mood Detection and Sound Orientation
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Solution Overview
Problem
Existing noise reduction methods, such as warning signs and sound insulation devices, are costly or ineffective in reducing noise pollution, which adversely affects human life and work.
Innovation Solution
A noise reduction device comprising sound receiving, transmitting, and sampling equipment, along with a control unit, that analyzes facial expressions to detect negative moods and generates noise cancellation signals to reduce noise based on noise orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If warning signs and sound insulation devices are used to reduce noise, then noise reduction effect is achieved, but installation cost and living cost increase
Solution Approach 1:
The patent converts the harmful noise waves into beneficial effects by using active noise control technology. The system generates anti-phase sound waves that cancel out the original noise through destructive interference, transforming the harmful acoustic energy into a noise-reduction mechanism without requiring physical barriers or insulation materials.
Solution Approach 2:
The patent replaces mechanical noise reduction methods (such as sound insulation devices and physical barriers) with an electronic and acoustic control system. By using microphones to detect noise, processors to generate anti-phase signals, and speakers to emit cancellation waves, the system substitutes mechanical intervention with electronic signal processing.
2Object-affected harmful factors
If traditional noise reduction methods are used, then some noise reduction effect is achieved, but the methods are ineffective for severe noise pollution
Solution Approach 1:
The patent implements a real-time feedback control system where microphones continuously monitor the noise environment, the processor analyzes the captured signals to determine noise characteristics and orientations, and the system dynamically adjusts the anti-phase sound waves accordingly. This closed-loop feedback mechanism ensures effective noise reduction even in severe and changing noise conditions.
Solution Approach 2:
The patent employs dynamic noise reduction that adapts to changing noise conditions in real-time. The system continuously detects noise sources, determines their orientations, and adjusts the cancellation signals dynamically, allowing it to handle varying noise levels and types effectively rather than relying on static insulation methods.
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
Effectively reduces noise by generating counter-phase signals targeted at noise sources, improving efficiency and reducing installation costs by integrating with existing devices like charging stations and air conditioners.
Implementation Method 1
process data of the noise to obtain a noise signal and noise orientations and generate a noise reduction signal having an amplitude same as the noise signal, and an opposite phase to the noise signal
Data Source
AI summary
A noise reduction method includes: obtaining environment data of a location where the noise reduction device is placed, the environment data including environment sound and facial images of a population within a preset range of the location; analyzing the facial images of the population to determine whether the one or more persons of the population are in a negative mood; determining whether noise is present in the environment sound when the one or more persons of the population are determined in the negative mood; processing the noise to obtain a noise signal and noise orientations when the noise is present in the environment sound; generating a noise reduction signal having an amplitude same as the noise signal and an opposite phase to the noise signal; and playing the noise reduction signal towards the noise orientation. A noise reduction device and an electronic device are also provided.