Project Overview
IoT stands for "Internet of Things," which refers to the integration of various information sensing devices, such as radio frequency identification, infrared sensors, GPS, laser scanners, and other information sensing devices, with the Internet according to agreed-upon protocols. The purpose is to connect all items to the network for information exchange and communication, facilitating identification and management.
So far, the Internet of Things has been making our lives increasingly convenient, from eating and dressing to traveling and shopping. The IoT is slowly becoming embedded in our daily lives. Smart wearable devices are an important part of this, and in the era of IoT, the functions of smart wearable devices are becoming more and more numerous. At the same time, the iterative updates of Bluetooth transmission technology, with its low power consumption, have further enhanced the performance of smart wearable devices, with representative products such as TWS earphones, smartwatches, and smart speakers.
Usually, when using products, it is inevitable to come into contact with liquids such as sweat and rainwater, which can cause damage to the acoustic performance of the product's microphone or lead to a decline in performance, resulting in a decrease in user experience. For testing the quality of the microphone's airtightness in products, MegaSig has a complete system ranging from software testing algorithms to hardware testing equipment, capable of quickly and accurately presenting the data of product microphone airtightness test items in a visual manner.
An Introduction
Smart Wearable IoT Product Microphone Airtightness Test Link
(1) Taking the TWS Earphone Airtightness Test Link as an example for illustration:
Microphone Acoustic Performance Airtightness Test:
Before the fixture action: The TWS earphone is connected and interacts with the U 982 Bluetooth adapter. AudioExpert pushes the audio signal to the PM 6143 audio data acquisition card, which then sends an acoustic signal through the AM 581 artificial mouth. The TWS earphone microphone captures the signal and sends it back to the AudioExpert audio analysis software via the Bluetooth HFP protocol through the U 982 Bluetooth adapter for signal analysis.
After the fixture action: The TWS earphone is connected and interacts with the U 982 Bluetooth adapter. The fixture, controlled by a cylinder, blocks the TWS microphone. Then, AudioExpert pushes the audio signal to the PM 6143 audio data acquisition card, which sends an acoustic signal through the AM 581 artificial mouth. The TWS earphone microphone captures the signal and sends it back to the AudioExpert audio analysis software via the Bluetooth HFP protocol through the U 982 Bluetooth adapter for signal analysis. The AudioExpert software calculates the difference between the two test curves to ultimately determine the airtightness effect.
Speaker Routine Acoustic Performance Test:
The TWS earphone is connected and interacts with the U 982 Bluetooth adapter. AudioExpert pushes the audio signal through the Bluetooth A2DP protocol to vibrate the finished earphone speaker. The CM 311 acoustic coupling chamber + A 803 preamplifier microphone kit collects the signal to the PM 6143 audio data acquisition card, which then sends the captured signal back to the AudioExpert audio analysis software for signal analysis.
(II) Taking the smartwatch airtightness test circuit as an example for illustration:
Microphone Acoustic Performance Airtightness Test:
Before the fixture action: The smartwatch is connected and interacts with the U 982 Bluetooth adapter. AudioExpert sends an audio signal to the PM 6143 audio data acquisition card, which then generates a sound signal through the AM 581 artificial mouth. The smartwatch microphone captures the signal and sends it back to the AudioExpert audio analysis software via the Bluetooth HFP protocol through the U 982 Bluetooth adapter for signal analysis.
After the fixture action: The smartwatch is connected and interacts with the U 982 Bluetooth adapter. The fixture, controlled by a cylinder, blocks the smartwatch microphone. Then, AudioExpert sends an audio signal to the PM 6143 audio data acquisition card, which generates a sound signal through the AM 581 artificial mouth. The smartwatch microphone captures the signal and sends it back to the AudioExpert audio analysis software via the Bluetooth HFP protocol through the U 982 Bluetooth adapter for signal analysis. The AudioExpert software calculates the difference between the two test curves to ultimately determine the airtightness effect.
Speaker Routine Acoustic Performance Test:
The smartwatch is connected and interacts with the U 982 Bluetooth adapter. AudioExpert sends an audio signal through the Bluetooth A2DP protocol to vibrate the finished speaker of the smartwatch. The M 663+A 802 free-field microphone kit collects the signal to the PM 6143 audio data acquisition card, which then sends the captured signal back to the AudioExpert audio analysis software for signal analysis.
(III) Taking the smart speaker airtightness test circuit as an example for illustration:
Microphone Acoustic Performance Airtightness Test:
Before the fixture action: The smart speaker is connected and interacts with the U 982 Bluetooth adapter. AudioExpert sends an audio signal to the PM 6143 audio data acquisition card, which then generates a sound signal through the AM 581 artificial mouth. The smart speaker microphone captures the signal and sends it back to the AudioExpert audio analysis software via the Bluetooth HFP protocol through the U 982 Bluetooth adapter for signal analysis.
After the fixture action: The smart speaker is connected and interacts with the U 982 Bluetooth adapter. The fixture, controlled by a cylinder, blocks the smart speaker microphone. Then, AudioExpert sends an audio signal to the PM 6143 audio data acquisition card, which generates a sound signal through the AM 581 artificial mouth. The smart speaker microphone captures the signal and sends it back to the AudioExpert audio analysis software via the Bluetooth HFP protocol through the U 982 Bluetooth adapter for signal analysis. The AudioExpert software calculates the difference between the two test curves to ultimately determine the airtightness effect.
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