Active Noise Suppression Device Using Anti-Phase Signal Cancellation
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Solution Overview
Problem
Existing noise suppression technologies are ineffective in reducing loud outdoor construction noises in residential areas, as they are designed for small spaces and cannot handle the aesthetic constraints of larger environments, limiting their practicality in urban settings.
Innovation Solution
A directional noise suppression device that uses anti-phase synchronization of outdoor noises, comprising a directional reception and processing circuit, attenuation control circuit, multi-channel digital amplifier circuit, and single-directional loudspeaker, to generate and transmit 'mirror image' noise signals that cancel out outdoor noise, ensuring effective noise neutralization within indoor spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If acoustic insulation devices such as double glass and seal treatment are installed, then relatively low outdoor noises can be suppressed, but louder noises cannot be effectively suppressed
Solution Approach 1:
The patent converts the harmful outdoor noise into a beneficial signal by using it as the reference for generating anti-noise signals. The directional microphone captures the outdoor noise, and the system generates inverted-phase signals that cancel the noise, effectively converting the noise problem into a solution opportunity.
Solution Approach 2:
The patent replaces traditional mechanical acoustic insulation devices with an electronic active noise control system. Instead of relying on physical barriers like double glass and seal treatment, the system uses electronic signal processing to actively cancel noise, providing adaptability to different noise levels and types.
2Volume of moving object
If traditional silencer and pilot headset products are used, then sound transmission space can be controlled in very small spaces, but the technology cannot be applied to larger spaces like apartments
Solution Approach 1:
The patent creates a universal noise suppression system that can function effectively in both very small spaces and large spaces like apartments. By using directional microphones and distributed loudspeakers, the system adapts to different space scales without requiring physical modification of the space itself.
Solution Approach 2:
The patent transitions from controlling sound transmission in a localized small space to controlling noise propagation in three-dimensional space across the entire room. By positioning loudspeakers at the inlet of noises and using directional audio processing, the system achieves noise suppression throughout the entire indoor space regardless of its size.
3Stability of the object's composition
If acoustic materials are pasted on the periphery to prevent sound reflection, then phase changes can be achieved in very small spaces, but the decoration materials cannot satisfy aesthetic requirements
Solution Approach 1:
The patent replaces physical acoustic materials with electronic phase control. Instead of pasting acoustic materials on walls to control sound reflection, the system uses electronic signal processing to control the phase of sound waves generated by loudspeakers, achieving the same effect without compromising aesthetic requirements.
Solution Approach 2:
The patent changes the parameter control from physical acoustic material properties to electronic signal parameters. By adjusting the phase and amplitude of electrical signals sent to loudspeakers, the system achieves precise control over sound wave phases without requiring physical modification of the environment, thereby maintaining aesthetic flexibility.
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 achieves noise suppression with an isolation degree of over 23 dB, effectively reducing outdoor noise levels and creating a quieter indoor environment by using ZY series noise suppression chips and DSP technology to account for transmission delays and reverberation, ensuring high fidelity and adaptive energy processing.
Implementation Method 1
the circuit structure of suppression device includes a directional reception and processing circuit for outdoor noises, a attenuation control circuit, a multi-channel digital amplifier circuit, and loudspeaker being installed at the inlet of noises, the directional reception and processing circuit for outdoor noise processes the noise signals collected from the outdoor environment and generates the inverted-phase signals
Implementation Method 2
which then enables the loudspeaker to generate noise compensation signals inverted to outdoor noises... the sounds sent from the same sound source can be turned into two-way sounds with opposite phases and corresponding amplitudes after technical processing, which will then generate the 'silence' when being played in the same space
Data Source
AI summary
The suppression device for outdoor noises in indoor space solves the technical problems on realizing better sound insulation effect within the room space and creating a quiet atmosphere for people's living environment. The structure includes an anti-noise sound source synchronized to and invert with outdoor noises. The circuit structure of suppression device includes a directional reception and processing circuit for outdoor noises, a attenuation control circuit, a multi-channel digital amplifier circuit, and loudspeaker being installed at the inlet of indoor noises. The directional reception and processing circuit for outdoor noises processes the noise signals collected from the outdoor environment and generates the inverted-phase signals, and then transmits them to the input terminal of attenuation control circuit. After being processed with attenuation by attenuation control circuit, the reverse-phase signals are sent out to input terminal of multi-channel digital amplifier circuit, which then enables the loudspeaker to generate noise compensation signals inverted to outdoor noises. This invention can provide the whole system with noise suppression capability over 28 dB.