Near ultrasound tests

This page contains steps for conducting near ultrasound (formerly known as hifi ultrasound) microphone and speaker tests. See the Audio section for general audio implementation instructions.

Near ultrasound microphone tests

Prerequisites: Prepare two devices, one as the test device, one as the reference device. The reference can be any device that is known to produce near ultrasound sound.

Step 1: Open Near Ultrasound Microphone Tests on both devices
Test device	Reference device
Step 2: After opening the test, press RECORD on the test device, then quickly press PLAY on the reference device.
Test device	Reference device
Step 3: Wait for the test to finish. While waiting, the devices should look like the following screenshots. Do nothing until you see the screens shown in Step 4.
Test device	Reference device
Step 4a: On the test device, if text PASS is shown, report passed by pressing the green button.
Test device	Reference device
Step 4b: On the test device, if text FAIL is shown, report failed by pressing the red button. Afterward you can repeat from step 1 to repeat the test if desired.
Test device	Reference device
Extra step: This step isn't required. You can plot the calculated response using the PLOT button on the test device.
Test device	Reference device N/A

Near ultrasound speaker tests

Prerequisites: Prepare two devices, one as the test device, one as the reference device. The reference can be any device that is known to record near ultrasound sound.

Step 1: Open Near Ultrasound Speaker Tests on both devices
Test device	Reference device
Step 2: After opening the test, press RECORD on the reference device, then quickly press PLAY on the test device.
Test device	Reference device
Step 3: Wait for the test to finish. While waiting, the devices should look like the following screenshots. Do nothing until you see the screens shown in Step 4.
Test device	Reference device
Step 4: When you see the popup on the reference device, press OK on the test device.
Test device	Reference device
Step 5a: On the reference device, if text PASS is shown, report passed by pressing the green button on the test device.
Test device	Reference device
Step 5b: On the reference device, if text FAIL is shown, report failed by pressing the red button on the test device. Afterward you can repeat from step 1 to repeat the test if desired.
Test device	Reference device
Extra step: This step isn't required. You can plot the calculated response using the PLOT button on the reference device. See the instructions in Near Ultrasound Microphone Test.