Chroma Branch - Loewe Q2500B Serviceanleitung

Technology of Q 2500 colour TV set
27 MHz
LM0-7
I2C-Bus
Speicher-
steuerung
µP-Bus
Y
U
V
4.6.1

Chroma branch

In the design of the colour television transmis-
sion the compatibility with normal black/white
systems must be observed, in order for colour
transmissions to be received by black and
white sets. For this reason the colour informa-
tion must be integrated into the available fre-
Document Q 2500
Main Channel
8
/
ITU 656
8
/
Decoder 1
16
ITU 656
/
Decoder 2
Sub Channel
Systemcontrol
µP - Interface
32 MHz
Triple
DAC
10Bit
DNC
Black Bar
movement
determination
determination
16
8
/
/
Dynamic
16 Noice
/
Reduction
Fast Switch
Source
Select
Luminance
10
Y-Delay Peaking
/
Chrominace
10
/
Demultiplexer
Digital colour
bandwidth
edge
doublin
10 sharpening
/
4:4:4
quency spectrum used for the brightness in-
formation.
Secondly, to prevent interference the band-
width for the colour signal must be kept as
narrow as possible. For this reason a band-
width of only 1.2 MHz was selected and the
carrier frequency set at 4.43 MHz.
100
I2311
SAA4979H
16
/
Field
Memory
3,5 MBit
16
/
Sample Rate
Conversion
27 to 32 MHz
Bypass
Down
Sampling
Bypass
UP
Sampling
Panoramic
Zoom
Y
U/V
© Loewe ProCollege
2L0-7
2C0-3
7L0-7
7C0-3