Akai PDP4294LV1 Service Manual download pdf (Page 48)

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• Complete Stand-Alone Line 21 Decoder for Closed-

Captioned and Extended Data Services (XDS)

• Preprogrammed to Provide Full Compliance with

EIA–608 Specifications for Extended Data Services

• Automatic Extraction and Serial Output of Special

XDS Packets (Time of Day, Local Time Zone, and

Program Blocking)

• Programmable XDS Filter for a Specific XDS Packet

• Cost-Effective Solution for NTSC Violence Blocking

inside Picture-in-Picture (PiP) Windows

• Minimal Communications and Control Overhead Pro-

vide Simple Implementation of Violence Blocking,

Closed Captioning, and Auto Clock Set Features

• Programmable, On-Screen Display (OSD) for Creat-

ing Full Screen OSD or Captions inside a Picture-in-

Picture (PiP) Window

• User-Programmable Horizontal Display Position for

easy OSD Centering and Adjustment

• I

C Serial Data and Control Communication

• Supports 2 Selectable I

C Addresses

Capable of processing Vertical Blanking Interval (VBI)

data from both fields of the video frame in data, the Z86229

Line 21 Decoder offers a feature-rich solution for any tele-

vision or set-top application. The robust nature of the

Z86229 helps the device conform to the transmission format

defined in the Television Decoder Circuits Act of 1990, and

in accordance with the Electronics Industry Association

specification 608 (EIA–608).

The Line 21 data stream can consist of data from several data

channels multiplexed together. Field 1 consists of four data

channels: two Captions and two Texts. Field 2 consists of

five additional data channels: two Captions, two Texts, and

Extended Data Services (XDS). The XDS data structure is

defined in EIA–608. The Z86229 can recover and display

data transmitted on any of these nine data channels.

The Z86229 can recover and output to a host processor via

the I

C serial bus. The recovered XDS data packet is further

defined in the EIA–608 specification. The on-chip XDS fil-

ters in the Z86229 are fully programmable, enabling recov-

ery of only those XDS data packets selected by the user. This

functionality allows the device to extract the required XDS

information with proper XDS filter setup for compatibility

in a variety of TVs, VCRs, and Set-Top boxes.

In addition, the Z86229 is ideally suited to monitor Line 21

video displayed in a PiP window for violence blocking,

CCD, and other XDS data services. A block diagram of the

Z86229 is illustrated in Figure 1.

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Akai PDP4294LV1 Service Manual Page 48

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