how calculate of round trip and the does 3.5mm adapter is necessary to run the test

user_5337332 0
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Hi Could you tell the oboe's implementation how calculate of round trip ?

For round trip test environment, according to https://github.com/google/oboe/blob/master/apps/OboeTester/docs/Usage.md

Some of these tests require an audio Loopback Adapter that plugs into a 3.5 mm jack. If the phone does not have a 3.5 mm jack then you can combine that with a USB to 3.5mm adapter.

Is it really needed? I still can get the latency result without loopback adapter in a quiet test environment, is this result wrong? In my android phone(oneplus 8, Android 10, CPU: Qualcomm 865, 8GB+128GB), I got latency.msec = 35.xx.

oboe android
1 Answers

The loopback adapter is required to test the signal path over a wired connection (either 3.5mm or USB).

The result you have measured is the over-the-air signal path from the built-in speaker to the built-in microphone. This is typically higher than a wired signal path because of extra signal processing introduced to improve the sound quality of the built-in speaker.

user_8249030
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