Articulate Instruments SyncBrightUp Руководство пользователя - Страница 11

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Manual for BrightUp unit. Document No. BrightUpManual_1.1

Technical Details

Specifications

SyncBrightUp Unit
Power Supply
Power Consumption
Sync signal
Case Dimensions
Weight
Serial Number

General Environmental

Temperature (Operation)
Temperature (Storage/Transport)
Humidity
When the PIC circuit receives an audio signal from the PC it
performs the following actions:
wake from SLEEP
•
switch on power to the sync separator and oscillator
•
wait a few mSec
•
for 100mS,
•
o send a pulse to the SyncBrightUp circuit to make a bright
square
o send a 1kHz tone to the PC audio input to sync the
system
o flash the LED to show that the circuit is working
switch off power to the sync separator and oscillator
•
go to SLEEP
•
The PIC wakes from SLEEP when it receives a signal greter than
130mV at its comparator input. The comparator is comparing the
audio input with 130mV from a potential-divider.
There is no off-switch. When the PIC is in SLEEP mode, it
consumes around 20uA. A pair of 1175mAh AAA Duracell cells will
last longer than their shelf life of 5 years.When receiving a tone on
the mic/line input channel, 2 frames (= 4 de-interlaced frames) of
video have a bright square are superimposed in the top right-hand
corner. At the same time 4 2kHz tones are superimposed on the
mic/line output. For 250mS following the 4 tones, VSync pulses
from the video channel are mixed into the audio signal mic/line
output. The PC can then sync its audio and video streams by
aligning the four de-interlaced frames with bright-up squares with
the four 2kHz tones. It can also estimate the video frame rate by
examining the VSync pulses during the following 250mS.
A typical audio recording looks like this:
Copyright © 2011 Articulate Instruments
3V dc (2x AAA batteries)
50mW
headphone level
H26 x W56 xD110
0.120kg
________
+10 to +40° C
-15 to +60 ° C
No Condensation 30 to 70%
03.07.13
11