Sony Multi Interface Shoe Adapter - Manual (Page 267)

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Overview
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Freeze image: An input image that has been frozen, but not saved to memory.
Still image: A freeze frame that has been saved to memory as a file. Each file
(still file) holds just one still image.
Frame memory clip: A clip consists of a sequence of still images, which
appears as a movie on playback. In this manual this is also referred to
simply as a “clip.” The files (still files) constituting clips are referred to as
a “clip file.”
When the above distinctions are not being made, an image is simply referred
to as an “image.”
Use of frame memory
There are eight frame memory channels, FM1 to FM8, and each channel
independently allows a freeze image to be saved or recalled.
By allocating FM1 to FM8 to cross-point buttons you can use the still image
output or clip output from each channel as input material.
Correspondence between input and output
There are two buses for capturing frame memory material: the frame memory
source 1 bus and the frame memory source 2 bus.
These input buses are used by allocation to one of the pairs of output, FM1&2,
FM3&4, FM5&6, and FM7&8. You can freeze a frame in each channel
separately, or freeze in the two channels simultaneously.
The source buses allocated to FM1 to FM8 are as follows.
Pair mode
By enabling the pair mode, you can link FM1 and FM2, FM3 and FM4, FM5
and FM6, and FM7 and FM8. For example, when a freeze or image processing
is carried out on FM1, the same operation is carried out on FM2. The same
applies to the other pairs. When a pair of images are captured in pair mode, the
image frozen in FM1 (3, 5, or 7) is referred to as the main file and the other
frozen in FM2 (4, 6, or 8) is referred to as the sub file.
Input Frame memory source bus 1 Frame memory source bus 2
Output FM1 FM2
FM3 FM4
FM5 FM6
FM7 FM8