Audio delay: Difference between revisions
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with three different settings. Note that exclusive mode is most used in experiments and is the mode best comparable with for | with three different settings. Note that exclusive mode is most used in experiments and is the mode best comparable with for | ||
instance Linux Alsa. Shared mode is best comparable with Linux Jack. | instance Linux Alsa. Shared mode is best comparable with Linux Jack. | ||
In exclusive mode the histogram is square. The minimum delay is 15 ms, the maximum delay is 24 ms. This is caused by a single 10 ms buffer. | |||
The maximum error is therefore 24 ms. When a distinction is made between accuracy and precision, the maximum accuracy error is 14 ms, | |||
the maximum precision error is 10 ms. | |||
Note that for most experiments this is more than good enough. | |||
=== Presentation, Exclusive Mode === | === Presentation, Exclusive Mode === | ||
[[File:Exclusive mode.png|border|Exclusive mode delay]] | |||
=== Presentation, Shared Mode === | === Presentation, Shared Mode === | ||
[[File:Shared.png|border|Shared mode delay]] | |||
=== Presentation, DirectX Mode === | === Presentation, DirectX Mode === | ||
[[File:Directx.png|border|DirectX mode delay]] | |||
== Alternative definitions == | == Alternative definitions == | ||
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=== Precision test === | === Precision test === | ||
This test does not measure the audio delay itself, but only the precision. It can be combined with the previous test. | This test does not measure the audio delay itself, but only the precision. It can be combined with the previous tests. | ||
The difference is that step 3 and 4 are exchanged. This effectively deducts the time that sending the audio stimulus | |||
takes is deducted from the audio delay. If the audio is made with a synchronous function then this test is similar to | |||
how visual delay is measured. | |||