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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 ==
=== 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.