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E-mem (effects memory), Work buffer, Keyframe – Grass Valley Kayenne v.3.0 User Manual

Page 55: Effect register, work buffer, and current effect

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KAYENNE — User Manual55

E-MEM (Effects Memory)

E-MEM (Effects Memory)

Grass Valley developed the E-MEM (Effects Memory) system to provide a
way of storing effects for later use. An effect defines parameter settings that
determine how the selected video sources are processed. An E-MEM effect
is learned into an effect register, and can then be recalled at a later time with
a single button press. Effects can be edited after they have been learned,
and effect data can also be saved to and loaded from disk.

Work Buffer

The work buffer is a fundamental aspect of system operation. The work
buffer contains the current state of the system, specifying the sources
selected and the video processing applied to those sources. The work buffer
tracks all the system parameters, including those that do not have controls
delegated. As the operator delegates and alters Control Panel and menu
settings, the associated parameters in the work buffer change. If any altered
work buffer parameters affect the video outputs of the switcher, the
appearance of these outputs will change accordingly.

Keyframe

A single set of processing control settings can be called a keyframe. A key-
frame defines the state of all or a portion of the switcher. Keyframes are
stored in E-MEM effect registers. Two types of information are associated
with a keyframe:

On/off settings, including source selections, and

Parameter settings.

For example, an effect can consist of a keyframe specifying source 1 on
ME-1’s background A bus, source 2 on its background B bus, a horizontal
wipe transition type, and a border. These are button settings, as they can be
turned on and off. The border could be thick and colored red. These are
parameter settings because a range of continuous values are available.

Effect Register, Work Buffer, and Current Effect

For clarity, the following description uses single keyframe effects. Multiple
keyframe effects are discussed later (see

page 57

).

The Kayenne system has 1000 E-MEM registers (numbered 0 - 999) able to
store operational settings for immediate recall. Effect register data must be
applied to the work buffer before these settings can affect the system. When
an effect register is recalled, keyframe data is loaded into the work buffer,
and that register number becomes the current effect (

Figure 29

). The current

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