Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 46)

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Features
Audio Processing
Voice-Overs
Voice-overs adjust the combined levels of the background audio and incoming voice-over so
the audio level does not exceed the original background volume. The diagram shows how the
‘duck’ and voice-over presets adjust the actual audio levels.
Fig. 4-3: Audio level during Voice-Over - duck and voice-over preset
The duck value is the amount by which the background audio level is attenuated when the
voice-over is fully on. The voice-over preset value is the level of the voice-over audio when the
voice-over is fully on. Both values are given in decibels.
The Imagestore 750 Configurator’s ‘Audio Graph’ page allows you to define 8 independent
voice-overs for use on the program bus. There are also 8 preview voice-overs for the preview
bus which can be set to cut up or down automatically based on the arm state of the corre-
sponding program voice-over. (See
Audio Mix Blocks on page 165 for more information.)
Easyplay
 Easyplay2 requires the IS-750-EP16 option to be enabled.
 Note: In software versions 3.1 and later, 16 channels of audio clip playout are also enabled by
IS-750-EP2 and IS-750-EP8 options.
The Easyplay feature allows digital audio clip storage and playout of up to four independent
streams sharing a total of sixteen audio channels. Many variations are possible, such as:
Easyplay audio clips are often associated with one of the 16 available voice-overs on PGM and
PVW. The associated voice-over may be configured to fade up automatically when the Easyplay
stream starts playing, and fade down automatically when the Easyplay stream stops. Alterna-
tively, the Easyplay stream can be configured to start or stop playing when its associated voice-
over is faded up or down.
You can place Easyplay in a mode in which it follows video layers cuts, fades, loads and unloads
automatically. In this mode, audio clips are loaded by association with image file names, and the
audio clips play out (or stop) automatically when the keyer associated to the media file is cut up
(or down). The association may be made with either program or preview keyers.
Voice-Over Preset
Duck Preset
Voice-Over Audio
Background Audio
Name Description Streams Channels
16 One stream playing out the widest possible audio clips 1 16
2.0 + 5.1 One language with two streams of different width 2 8
2.0 + 5.1 + 2.0 + 5.1 Two languages each with two streams of different
widths 4 16
2.0 + 2.0 Two stereo streams under independent control 2 4
2.0 + 2.0 + 2.0 + 2.0 Four stereo streams under independent control 4 8
Table 4-5: Example Easyplay2 streams and channels possibilities