Earphone Test Station Digital Interface Automation
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Solution Overview
Problem
The development and manufacture of active noise reduction earphone devices are complicated by the transition from analogue to digital technologies, requiring effective communication and synchronization of configuration and control messages, as well as data integration across a spatially extended test system, which is challenging in factory environments.
Innovation Solution
A digital interface-based earphone device/test station pairing that enables two-way communication and automated testing, using a processor module and test module to perform rapid testing and configuration, accommodating both wired and wireless interfaces, and allowing for self-calibration and tuning with a test station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital technologies are used in earphone devices and test systems, then functionality and integration are improved, but device complexity and difficulty of testing increase due to need for configuration communication, data integration, and time-synchronization
Solution Approach 1:
The patent introduces a test module as an intermediary component that manages all digital communications between the test station and earphone device. This mediator handles configuration messages, control signals, and data integration, simplifying the overall system architecture by centralizing the complexity in a dedicated component rather than distributing it across multiple subsystems.
Solution Approach 2:
The digital interface is designed to serve multiple functions simultaneously: it transmits audio signals, carries configuration messages, conveys control commands, and enables data exchange for testing purposes. This multi-functionality reduces the need for separate dedicated interfaces for each purpose, thereby reducing overall system complexity while maintaining full digital capabilities.
2Loss of information
If digital interface is used for communication between test station and earphone device, then data transmission capability is improved, but time-synchronization difficulty increases due to spatially extended system and weak connections
Solution Approach 1:
The test module implements feedback mechanisms that monitor data transmission timing and adjust synchronization accordingly. By continuously measuring actual transmission times and comparing them against expected values, the system can detect and correct timing drift, ensuring accurate time-synchronization across the spatially extended test environment despite variable connection conditions.
Solution Approach 2:
The system performs preliminary calibration and synchronization setup before actual testing begins. Configuration messages are exchanged in advance to establish timing references and synchronize clocks between test station and earphone device, ensuring that when testing commences, time-synchronization is already optimized and minimal adjustment is needed during the test itself.
3Manufacturing precision
If sample-by-sample testing is performed during manufacture, then manufacturing precision is improved, but productivity decreases due to time-consuming individual characterization
Solution Approach 1:
The test module executes pre-programmed test sequences and characterization routines that are prepared in advance. By having test protocols predefined and automatically executed, the system eliminates manual setup and measurement time for each sample, enabling rapid sequential testing that maintains individual sample precision while significantly increasing overall manufacturing throughput.
Solution Approach 2:
The earphone device and test station automatically perform mutual characterization without requiring manual intervention. The system self-calibrates, self-tests, and automatically records results, eliminating the need for operator involvement in each testing cycle. This automation maintains high measurement precision while dramatically increasing productivity by enabling continuous unattended operation.
Data Source
AI summary
An earphone device/test station pairing (1, 2) includes an earphone device (1) including: at least one electroacoustic driver (32, 33, 34); a digital module (31) including a processor module; and a digital interface configured to connect the earphone device (1) to a media/communications device having a digital output; a test station (2) including at least one transducer (40, 42, 6), the test station (2) being operative to communicate with the earphone device (1) via the digital interface to allow data transmission between the earphone device (1) and the test station (2) during a test/configuration procedure; and a test module (4) for performing automated testing of the earphone device (1) when mounted on/connected to the test station (2).