TMC22091 datasheet(41/60 Pages) CADEKA

41 / 60 page

PRODUCT SPECIFICATION

TMC22091/TMC22191

A DOWNSTREAM KEY image comprises the white alpha

characters "HAPPY FACE", and black alpha characters

"Time". This is to be superimposed over the previous 3-layer

composite image. The key signal needed for superimposing

DOWNSTREAM KEY image over the other composite

images is shown to the right. This represents a single bit sig-

nal mapped over the image. When the signal is black (logic

LOW), the DOWNSTREAM KEY image is active, when it

is white (logic HIGH), the previous composite image is

active.

The ﬁnal 4-layer composite image, DOWNSTREAM KEY

over FOREGROUND over MIDGROUND over BACK-

GROUND, is shown in Figure 21.

In this illustration, all four source images are static (not mov-

ing). The images input to the TMC22191 can just as well be

"live" (from video camera or VCR sources) as long as:

• Data from those sources is in an input format that the

TMC22191 can accept, and

• The sources either synchronize the TMC22191

(Genlock mode) or are synchronized by the TMC22191

(Master or Slave mode).

Key signals may be generated external to the TMC22191

(Hardware Keying) and use the KEY input pin for control.

Key signals may also be generated within the TMC22191

(Data Keying) by the comparison of input color data with

color data stored in the TMC22191.

Figure 20. Adding a 3rd Layer

2-LAYER COMPOSITE

FOREGROUND

KEY

3-LAYER COMPOSITE

27037A

HI KIDS !

Figure 21. Adding a 4th Layer

3-LAYER COMPOSITE

DOWNSTREAM KEY

KEY

4-LAYER COMPOSITE

27038A

HI KIDS !

HAPPY

FACE

TIME

HAPPY

FACE

TIME

HAPPY

FACE

TIME

TMC22091 Datasheet(PDF) 41 Page - Cadeka Microcircuits LLC.

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