Projection Device Active Noise Cancellation for Cooling Fans
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Solution Overview
Problem
Projection apparatuses generate noise during operation, such as cooling fan noise and electronic component noise, which interfere with user experience.
Innovation Solution
A noise reduction method using a speaker to output a noise reduction signal based on a pre-configured target noise signal, determined by the cooling fan noise, and optionally using a microphone to collect and process noise signals for voice interactions, with noise feature information used to control the speaker output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is used to cool electronic components, then the temperature control is improved, but noise is generated during operation
Solution Approach 1:
The patent applies active noise control by using the speaker to emit anti-phase noise signals that cancel out the harmful cooling fan noise. The noise reduction signal generator creates a signal opposite in phase to the fan noise, and the speaker outputs this canceling signal, converting the harmful noise into a beneficial noise cancellation effect.
Solution Approach 2:
The patent introduces a noise reduction signal generator and speaker as intermediary components between the cooling fan noise source and the user. These intermediaries process the noise signal and generate a counter-signal that cancels the original noise, effectively mediating the harmful effect without changing the cooling fan operation.
2Object-generated harmful factors
If noise reduction technology is added to cancel fan noise, then noise is reduced, but device complexity increases
Solution Approach 1:
The patent makes the speaker serve multiple functions: it not only outputs audio content but also generates noise reduction signals to cancel fan noise. This multi-functionality reduces the need for separate dedicated noise cancellation hardware, thereby limiting the increase in device complexity while achieving noise reduction.
Solution Approach 2:
The system uses its own speaker component to provide noise cancellation functionality. The noise reduction signal generator processes signals from the speaker itself, and the speaker re-output the cleaned signal, allowing the system to self-service its noise problem using existing hardware rather than requiring external or additional specialized components.
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 cancels out noise generated by the projection apparatus, improving sound quality and user experience without adding hardware.
Implementation Method 1
generating a noise reduction signal based on a pre-configured target noise signal... sending the noise reduction signal to the speaker for output... used to cancel out a noise generated by the projection apparatus
Data Source
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AI summary
Disclosed are a noise reduction method, a projection device, and a storage medium. The noise reduction method can be applied to the projection device, and the projection device comprises: a loudspeaker and a heat dissipation fan. The method comprises: generating a noise reduction signal on the basis of a pre-configured target noise signal, wherein the target noise signal is determined on the basis of the noise generated when a heat dissipation fan works; and sending the noise reduction signal to a loudspeaker for output.