Operation
The unique architecture of AirCleaner
®
allows for multiple user modes consisting of one or two screeners,
multiple trigger options and the ability to have two completely independent delay paths through the
system with independent control of audio and video delay.
Although AirCleaner
®
was designed primarily as a device to screen out visual and aural obscenities and
profanities, it also features an adjustable delay to offset audio relative to video and therefore may also
find uses as an audio-to-video synchronization device.
Realizing that every broadcast facility is designed for a unique work-flow, AirCleaner
®
in turn is designed
with maximum flexibility in mind. AirCleaner
®
provides the flexibility required to meet a multitude of
needs.
AirCleaner
®
can be quickly and easily configured by the user to provide either one-screener or
two-screener operation. With two-screener operation, the internal delay can be split between the two
screeners in any proportion desired; each of these screeners also has their own parameters for reaction
time, individually adjustable for both audio and video. AirCleaner
®
also offers a simple way to offset
the audio and video delay to compensate for timing or synchronization errors in the incoming audio/video
feed.
Theory of Operation
The basic operation of AirCleaner
®
is described below. Only the video pathway is described, and the
basic increment of time is one second (the number of frames depends on the video format).
In this example, AirCleaner
®
is programmed with the following parameters:
• Screeners = One
• Total PGM Delay = 40:00
• Video Reaction 1 = 2:00
• On Video Trigger = Defocus
• Defocus Ramp = 0:00
This example begins at an arbitrary time zero (00:00) as shown by the stop watch timer. As this example
progresses, the stop watch timer advances as the violation segment of video shifts rightward through
the video pipeline.
The real-time defocus engine is positioned at the end of the video pipeline in AirCleaner
®
, and is normally
switched out of the video pathway. As you will see, when the first video frame that is marked as the
start of violation reaches the end of the delay pipeline, AirCleaner
®
then automatically switches the
video output to the processed output of the real-time defocus engine
Time 00:00
The current video that the screener is looking at is safe, with no violations. There are violations coming
(marker with an X) in the next 5 seconds. Each box in the figures below represent 1 second. The 0 frame
will also advance through the delay.
12 • Operation — AirCleaner-2 User Manual (v01)