Videonics MX-1 Instruction Manual page 30

VIDEONICS DIGITAL VIDEO MIXER
• If you are changing the noise filter or chroma AGC settings, use the ABCD
buttons at the bottom of the Mixer's panel to choose which source you
wish to change. (The other settings affect all sources at once and do not use
the ABCD selection.)
• Use the up and down arrow keys to make the change.
• Press OK or PLAY when you're done.
Here are the options you can change and their meanings (from left to right
in the above diagram):
Headphone Volume: 0 is the lowest setting and 9 is the highest. Head-
phone volume is the same for all sources — the ABCD buttons have no effect
when you are setting headphone volume.
Input/Output Frame Rate Lock Disable: This setting (explained in detail
in Chapter 18, "TBC") compensates for slight deviations in video frame rate
between the inputs and the output. When it is locked (setting 0), the MX-1
adjusts the frame rate of the output by very small amounts at the end of each
video field, to reduce or eliminate the need to repeat or drop video fields.
This is the normal setting and is appropriate for most equipment.
The ABCD buttons have no effect on Frame Rate Lock Disable — it affects
all sources at once.
Noise Filter: The MX-1 includes a very sophisticated filter which adjusts
the appearance of the video. The normal setting, 0, passes the full, maximum
quality signal through and is the best setting for most equipment. Higher
settings increase filtering to compensate for video signal problems such as
video that is over-processed using sharpness controls, enhancers, etc. Use the
higher settings if you see picture lines shift to the right, horizontal white
flashes, horizontal black lines at the left hand edge of the picture, or shredded
pictures. Chapter 20, "Video Quality," discusses this in detail. Increase the
setting until the problem is alleviated.
These settings can also be used to reduce noisy (snowy) video. Some
settings affect the whole picture and some only affect edges of shapes and
lines.
Each source has its own noise filter setting, so you can adjust each sepa-
rately. Note that these settings go back to 0 when the power is lost.
Black Level: Video equipment commonly uses one of two black level
settings: 7.5 IRE units, the traditional black, and 0 IRE, a darker black level
favored by a variety of modern equipment. When this setting is 0, the Mixer's
background and border colors use the extra dark black (0 IRE) level. Change
the setting to 1 if you are working with equipment that requires 7.5 IRE.
Composite Chroma AGC: If a composite (RCA-style) input source has a
weak color signal, the Mixer can be set to compensate. If a composite source
looks pale, set the Composite Chroma AGC setting to 1 and the AGC (Auto-
matic Gain Control) will automatically adjust color levels on all composite
inputs. Most sources have correct chroma levels and we recommend you
leave this setting at 0. AGC does not affect S-video sources.
You can adjust chroma AGC for each composite (RCA-style) source. Note
that if the Setup screen shows that a source is set to use the S-video (Y/C)
jack, the AGC setting will not change.
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