Articulate Instruments SyncBrightUp Руководство пользователя - Страница 10

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Manual for BrightUp unit. Document No. BrightUpManual_1.1

around 180 horizontal sync cycles and once it comes out of that

loop if the trigger is still high it will retrigger so the upper limit on the

length of the trigger pulse is about 300ms. The amplitude of the

trigger signal should be at least 1.55V [this usually equates to

soundcard levelset at about 30% so set the output to about 40% to

ensure triggering from this source.

The SBU is triggered by the right audio channel only and the left

audio channel passes through the SBU to the speaker output

unchanged and presented as mono to both left and right

speakers/earphones. This means you can play audio prompts on

the left channel without it triggering the SBU and the participant will

only hear the prompt as a mono signal played though both

headphone channels and not hear the trigger beep.

NB. If you want to use audio prompts in AAA then record them

on the left channel ONLY to avoid triggering the SBU with the

audio prompt.. If you want the participant to hear the trigger beep

then record it on both channels otherwise record it on the right

channel only.

NB: If audio beep input to Speaker:to PC socket is present on the

left channel (tip of connector) but NOT on the right channel (ring of

the connector) then the SBU will not trigger.

The audio sync signal

Because the SBU produces a sync pulse signal only on the left

output channel, if recording stereo, the right channel will not have

the sync signal mixed into it. Useful if the trigger occurs while the

participant is talking.

Trigger signal (e.g. audio beep) must

be on the right audio channel or both

channels when input to Speaker:to PC

Audio signal transmitted from left

input (Speaker:to PC) channel to both

Speaker: to spk output channels.

03.07.13