Active Noise Control for Automatic Door Drives

The patent replaces mechanical noise reduction measures (insulation, decoupling) with an electronic/acoustic system. A recording device captures the mechanical operating noise, a processor analyzes and inverts the phase of the recorded signal, and a playback device reproduces the inverted signal to cancel the original noise through acoustic superposition. This substitution of mechanical methods with electronic signal processing resolves the contradiction by achieving noise reduction without the cost and effectiveness limitations of mechanical approaches.

The patent converts the harmful mechanical operating noise into a useful signal for cancellation. The recording device captures the noise that would otherwise be harmful, the processor transforms it by phase inversion, and the playback device uses it to create destructive interference with the original noise. This transforms the harmful noise into a beneficial cancellation signal, resolving the contradiction between noise reduction and cost-effectiveness.

The patent replaces expensive mechanical noise reduction measures with an electronic active noise control system. The system uses a recording device to capture noise, a processor to generate inverted phase signals, and playback devices to reproduce cancellation signals. This electronic approach achieves noise reduction at lower cost and with higher effectiveness, resolving the contradiction between noise reduction and cost efficiency.

The patent changes the approach from passive mechanical noise reduction to active electronic noise control by modifying the temporal and phase parameters of the noise signal. The recording device captures the noise waveform, the processor inverts its phase and adjusts timing, and the playback device reproduces the modified signal. This parameter-based approach achieves superior noise reduction at lower cost compared to conventional mechanical measures.

The patent employs a processor that performs multiple functions: it receives the recorded noise signal, analyzes its characteristics, inverts the phase, adjusts timing, and generates the cancellation signal. This multi-functional processing approach consolidates what would otherwise require multiple separate devices into a single integrated unit, reducing overall system complexity while achieving effective noise cancellation.

The patent uses the processor as an intermediary between the recording device and playback device. The processor receives the raw noise signal from the recording device, transforms it through phase inversion and timing adjustment, and outputs the cancellation signal to the playback device. This intermediary approach simplifies the system architecture by centralizing the complex signal processing functions in a single component rather than distributing complexity across multiple devices.