Acoustic Sensor Array for Noise Isolation in Enclosed Cabins
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Solution Overview
Problem
Background noise at work sites, particularly around construction and mining equipment, interferes with clear communication between machine operators and ground personnel, making verbal communication difficult due to the isolation of operators within enclosed compartments and the simultaneous transmission of noise with communication signals.
Innovation Solution
A sound monitoring system equipped with multiple microphones arranged in an acoustic signal detection array, which captures environmental noise and separates desired verbal communication from undesired background noise, using a controller to process signals and transmit clear audio to the operator compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple microphones are arranged in an acoustic signal detection array to capture environmental noise, then the ability to detect and separate desired sound from background noise is improved, but the device complexity increases
Solution Approach 1:
The acoustic sensor is divided into multiple microphones arranged in an array, with each microphone capturing sound from different directions. The controller segments the acoustic sensor output signal into multiple portions corresponding to different microphones, enabling directional sound detection and separation of desired communication from background noise through spatial analysis
Solution Approach 2:
The controller performs multiple functions using the same acoustic sensor array: it detects environmental noise levels, identifies directional sound sources, separates verbal communication from background noise, and generates filtered output signals. This multi-functionality improves measurement precision without proportionally increasing device complexity
2Reliability
If the operator compartment is enclosed to protect the operator, then safety and comfort are improved, but communication with ground personnel deteriorates due to isolation from environmental noise
Solution Approach 1:
The acoustic sensor array and controller system acts as an intermediary between the enclosed operator compartment and the external environment. It captures environmental sounds outside the compartment, processes them to isolate verbal communication from background noise, and transmits the filtered signals to the operator, enabling clear communication while maintaining the protective enclosure
Solution Approach 2:
The system replaces direct acoustic transmission through the compartment structure with an electronic signal processing system. Instead of relying on physical sound transmission through walls and windows, the system uses microphones, digital signal processing, and speakers to electronically transmit communication signals, overcoming the isolation effect of the enclosed compartment
3Ease of operation
If assisted communication devices are used to enable communication between operator and ground personnel, then communication capability is improved, but background noise is simultaneously transmitted along with verbal communication deteriorating quality
Solution Approach 1:
The controller extracts the desired verbal communication signal from the mixed acoustic sensor output that contains both communication and background noise. By analyzing signals from multiple microphones in the array and applying signal processing algorithms, the system separates the communication portion from the background noise portion, transmitting only the clear verbal communication to the operator
Solution Approach 2:
The system uses feedback from the acoustic sensor array to continuously monitor and analyze the acoustic environment. The controller adjusts signal processing parameters based on the detected noise levels and communication signals, optimizing the separation of desired sound from background noise in real-time to maintain high communication quality
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 communication clarity by isolating verbal commands from background noise, allowing operators to receive and understand messages more effectively, improving safety and operational efficiency by providing directional sound detection and processing.
Implementation Method 1
an acoustic sensor including a plurality of microphones arranged into an acoustic signal detection array configured to detect and capture the environmental noise level
Implementation Method 2
the controller is programmed to receive and perform a signal processing on the acoustic sensor output signal to identify a first portion of the acoustic sensor output signal and a second portion of the acoustic sensor output signal
Implementation Method 3
the speaker emits the controller output signal
Data Source
AI summary
A sound monitoring system for collecting and processing an environmental noise level surrounding a work machine is disclosed. The sound monitoring system may include an acoustic sensor having a plurality of microphones arranged into a signal detection array to capture the environmental noise level and generate an acoustic output signal. Additionally, the sound monitoring system may include a controller communicably coupled to the acoustic sensor and programmed to perform a signal processing to identify a first portion and a second portion of the acoustic output signal. Furthermore, the controller may be programmed to generate a controller output signal based on the first and second portions of the output level. A speaker may be located on the work machine and communicably coupled to the controller such that the speaker receives and emits the controller output signal.