Selective Noise Cancellation for Work Vehicle Operators
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Solution Overview
Problem
Current noise cancellation systems in work vehicles indiscriminately dampen all sounds, making it difficult for operators to hear equipment malfunctions or important audio signals, such as voice commands and sirens, which can compromise safety and operability.
Innovation Solution
A system and method for active noise cancellation in work vehicles that includes an input device, an output device, and a signal processing apparatus to separate ambient noise from equipment noise, generating an output waveform that cancels ambient noise while allowing targeted noise, like faulty equipment sounds, to be passed through, using techniques like Fourier analysis and filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise-isolating headphones or ear plugs are used to block all sounds, then operator comfort is improved, but operator safety deteriorates because important audio signals cannot be heard
Solution Approach 1:
The audio signal is segmented into different frequency components using Fourier analysis. The system separates ambient noise from equipment noise by analyzing specific frequency ranges, allowing selective cancellation of harmful noise while preserving important safety-related sounds.
Solution Approach 2:
Different frequency bands are treated differently by the system. The noise cancellation is applied selectively to specific frequency ranges identified as ambient noise, while other frequency ranges containing equipment malfunction signals are preserved without cancellation, creating localized quality differences in noise treatment.
2Object-affected harmful factors
If all sounds are dampened indiscriminately, then operator comfort is improved, but ability to detect equipment malfunctions deteriorates
Solution Approach 1:
The system segments the audio spectrum into distinct frequency components through Fourier analysis. By identifying which frequency segments correspond to ambient noise versus equipment operation sounds, the system can selectively cancel only the harmful ambient noise while preserving equipment malfunction detection capabilities.
Solution Approach 2:
The noise cancellation effect is applied locally to specific frequency bands rather than uniformly across all frequencies. Frequency ranges associated with equipment malfunctions are excluded from cancellation, maintaining local quality differences that preserve diagnostic audio signals while reducing overall noise exposure.
3Object-affected harmful factors
If active noise cancellation is applied to all audio signals, then ambient noise is reduced, but important audio signals such as voice commands and sirens are also cancelled
Solution Approach 1:
The audio signal is segmented into frequency components, and the system identifies which segments contain important information such as voice commands, alarms, and equipment signals. The noise cancellation is then applied only to segments identified as ambient noise, preserving information in other segments.
Solution Approach 2:
Different quality treatment is applied to different frequency regions. Frequency regions containing critical information maintain their original quality without cancellation, while frequency regions identified as ambient noise receive cancellation treatment, creating local quality differences that preserve information integrity.
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
Enhances operator safety and comfort by allowing the perception of critical noise while reducing ambient noise to tolerable levels, enabling the detection of equipment malfunctions and reception of targeted audio signals.
Implementation Method 1
generating an output waveform that cancels ambient noise while allowing targeted noise, like faulty equipment sounds, to be passed through
Data Source
AI summary
In one aspect, a system of active noise cancellation includes a signal processing apparatus in operative communication with at least one input device and at least one output device disposed within or proximate to a cabin of a work vehicle. Generally, the signal processing apparatus can be configured to perform a method of active noise cancellation. The method can include receiving an audio input signal from the at least one input device, the audio input signal comprising audio perceptible from within the cabin. The method can also include processing the audio input signal to separate ambient noise in the audio input signal from equipment noise in the audio input signal and generating an output waveform based on the ambient noise, and outputting the output waveform through the at least one audio output device. The output waveform can be configured to at least partially cancel out the ambient noise.