ASK
User Manual
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OSC:
The principle of Open Sound Control (OSC) protocol is for networking sound synthesizers,
computers, and multimedia devices for musical performance or show control. As with XML and JSON,
the OSC protocol allows sharing data. OSC is transported via UDP packets between devices connected
on an Ethernet.
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Brightness
：
Usually refers to the amount or intensity of video light produced on a screen without
regard to colour. Sometimes called black level.
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Contrast Ratio
：
The ratio of the high light output level divided by the low light output level. In
theory, the contrast ratio of the television system should be at least 100:1, if not 300:1. In reality,
there are several limitations. Well-controlled viewing conditions should yield a practical contrast
ratio of 30:1 to 50:1.
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Colour Temperature:
The colour quality, expressed in degrees Kelvin (K), of a light source. The higher
the colour temperature, the bluer the light. The lower the temperature, the redder the light.
Benchmark colour temperature for the A/V industryinclude5000°K,6500°K,and9000°K.
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Saturation:
Chroma, Chroma gain. The intensity of the colour, or the extent to which a given colour in
any image is free from white. The less white in a colour, the truer the colour or the greater its
saturation. Saturation is the amount of pigment in a colour, and not the intensity.
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Gamma:
The light output of a CRT is not linear with respect to the voltage input. The difference
between what you should have and what is actually output is known as gamma.
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Frame:
In interlaced video, a frame is one complete image.A video frame is made up of two fields,
or two sets of interlaced lines. In a film, a frame is one still image of a series that makes up a motion
image.
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Genlock:
Allows synchronisation of otherwise video devices. A signal generator provides a signal
pulses which connected devices can reference. Also see Black Burst and Color Burst.
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Blackburst:
The video waveform without the video elements.It includes the vertical sync,
horizontal sync, and the Chroma burst information. Blackburst is used to synchronize video
equipment to align the video output.
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ColourBurst:
In colour TV systems, a burst of subcarrier frequency located on the back part of the
composite video signal. This serves as a colour synchronizing signal to establish a frequency and phase
reference for the Chroma signal. Colour burst is 3.58 MHz for NTSC and 4.43 MHz for PAL.
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Colour Bars
：
A standard test pattern of several basic colours (white, yellow, cyan, green, magenta,
red, blue, and black) as a reference for system alignment and testing. In NTSC video, the most
commonly used colour bars are the SMPTE standard colour bars. In PAL video, the most commonly
used colour bars are eight full field bars. On computer monitors the most commonly used colour
bars are two rows of reversed colour bars
