Closed Caption & V-Chip (Basic Signal Path)
Overview
The Media Receiver incorporates one Closed Caption Decoder and two V-Chip Program Blocking IC’s. The two
V-Chip Decoders are for main and sub-picture. The Closed Caption Decoder is used for the main picture only.
31K Component signals do not pass through either of these circuits.
Main Picture
If tuner 1 input were selected as the main picture it would first pass through IC1301 and be outputted to Switch
IC2504 and sent to the main picture V-Chip IC1603 and the Closed Caption Decoder IC1602. The Closed Caption
Data would output IC1602 by two paths. The Text box information would enter IC803 directly and the text data
would pass through IC1401, the RGB and component selector IC prior to entering IC803. If Closed Caption were
selected to be viewed the signals would be added in IC803 to the main RGB output signal. The signal going into
the V-Chip IC1603 is decoded and checked by IC1102. The Sensing IC1102 checks for v-chip settings by the
customer. It receives its information from the main CPU (IC1) and if the v-chip content is not allowed to be viewed
the signal will not enter the 3-D YC separator IC7001. The signal will be to grounded by IC2504.
Sub-Picture
If tuner 2 were selected for sub-picture the output from IC1301 would be sent to switch IC2505 and in this case
sent to V-Chip (2) IC1601. The same sensing IC (IC1601) is used for Sub-Picture V-Chip control and IC2505 will
ground the input to IC402 if the content detected should not be viewed.
Note:
Only one setting for V-Chip Content Protection can be set by the customer. Therefore Main and Sub Pictures
share the same setting.
