Acoustic Transducer Impact Detection in Handheld Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for evaluating impacts in handheld devices are often costly, complex, and inaccurate, especially when used outside controlled environments, and fail to provide reliable data on drop rates and impact severity.
Innovation Solution
A wireless device equipped with a processor, acoustic transducer, and accelerometer that detects and measures impacts by acquiring data from the acoustic transducer, determining the severity of impacts, and storing this information in memory, with the acoustic transducer activated upon detection of freefall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for evaluating impacts are used, then impact detection can be performed, but the methods are costly, complex, and inaccurate
Solution Approach 1:
The acoustic transducer is designed to serve multiple functions: it acts as both a speaker for audio output and a sensor for impact detection. By utilizing the same component for both audio playback and impact sensing, the system eliminates the need for separate dedicated impact sensors, thereby reducing device complexity while maintaining accurate impact detection capabilities through analysis of the transducer's electrical characteristics during impact events
Solution Approach 2:
The acoustic transducer monitors its own electrical characteristics (impedance, resonant frequency) to detect impacts. The transducer serves itself by using its inherent physical properties to sense impact events without requiring external sensing components. The processor analyzes changes in the transducer's electrical behavior that occur naturally during impact events, enabling self-diagnostic capability
2Reliability
If existing impact evaluation methods are used outside controlled environments, then field data can be collected, but the data is unreliable
Solution Approach 1:
The system replaces complex mechanical impact sensing mechanisms with electrical characteristic analysis of the acoustic transducer. Instead of using dedicated mechanical sensors that require complex calibration and signal processing, the invention utilizes electrical measurements (impedance, resonant frequency) that naturally change during impact events, providing reliable field data with simpler processing requirements
Solution Approach 2:
The system continuously monitors the electrical characteristics of the acoustic transducer and compares them against baseline values to detect impact events. The processor analyzes real-time feedback from the transducer's electrical behavior, enabling reliable detection of impacts in field conditions without requiring controlled environment testing or complex external validation systems
3Measurement precision
If dedicated impact sensors are added to handheld devices, then impact detection capability is improved, but device cost and complexity increase
Solution Approach 1:
The acoustic transducer is designed to serve multiple functions: it acts as both a speaker for audio output and a sensor for impact detection. By utilizing the same component for both audio playback and impact sensing, the system eliminates the need for separate dedicated impact sensors, thereby reducing device complexity
Solution Approach 2:
The invention merges the audio output function and impact sensing function into a single acoustic transducer component. By combining these functions, the system reduces the total component count, simplifies manufacturing, and lowers device cost while maintaining both audio quality and impact detection capability
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
Enables accurate and cost-effective detection and measurement of impacts in handheld devices, providing valuable data on drop rates and severity, which can help identify causes of failure and improve device design and maintenance.
Implementation Method 1
an acoustic transducer... detecting whether an impact has occurred; and determining a severity of the impact as a function of an input to the acoustic transducer
Data Source
AI summary
A system and method is provided for detecting and measuring impacts in a wireless device. The wireless device has a processor coupled to a memory and an acoustic transducer. The method comprises acquiring data from the acoustic transducer, the data acquisition including the processor taking samples of an electrical input signal supplied to an input of the processor by the acoustic transducer; saving the acquired data in the memory; detecting whether an impact has occurred; and halting data acquisition after the impact is detected.