DTV Feature

EPG(Electronic Program(me) Guide)/Teletext

• Electronic program guide
• Java DVB EPG API
• Planning for Accessible Video and DVD

Subtitle/CC and Video Description

• What is the difference between open and closed captioning?
• Closed captioning
  • EIA-608 and EIA-708 Closed Captioning
  • Implementing DTV Closed Captions and Video Description
  • DTV Captioning Transitioning from 608 to 708

• Video Description

• EIA-608(line 21 captions)
  • In the NTSC television format, line 21 in the vertical blanking interval (VBI) has been allocated to carry closed captioning information.
  • Channels
    • The Line 21 data stream can consist of data from several data channels multiplexed together.
    • Field 1 has four data channels: two Captions (CC1, CC2) and two Text (T1, T2).
    • Field 2 has five additional data channels: two Captions (CC3, CC4), two Text (T3, T4), and Extended Data Services (XDS).
    • As CC1 and CC2 share bandwidth, if there is a lot of data in CC1, there will be little room for CC2 data. Similarly CC3 and CC4 share the second field of line 21. Since some early caption decoders supported only CC1 and CC2, captions in a second language were often placed in CC2. This led to bandwidth problems, however, and the current FCC recommendation is that bilingual programming should have the second caption language in CC3.

• EIA-708, CEA-708
  • the standard for closed captioning for ATSC digital television streams in the United States and Canada
  • injected into MPEG-2 video streams

• EIA-CEB8 - Consideration of EIA-608-B Data Within the DTV

V-chip

• V-chip
  • CEA-608
    • Closed Caption Disassembly Documentation: XDS(Extended Data Setvices)
    • Extended Data Service is transmitted on channel CC3 (also known as channel 1 of Line 284)
  • CEA-766, V-chip 2.0

• How do the V-Chip Requirements affect DTV Products?

PSIP/PMCP

• Program and System Information Protocol(PSIP)
  • ATSC Standard: Program and System Information Protocol for Terrestrial Broadcast and Cable (Revision C) With Amendment No. 1
  • PSIP Generation and ATSC Stream
  • PSIP: Progam and System Information Protocol

• ATSC Standard: Programming Metadata Communication Protocol, Revision B

PiP/PoP/

Copy Protection/CA(Conditional Access)

• Microvision

• Audio

MTS(Multi Channel Television Sound), SAP(Second Audio Program)

• MTS 立體聲﹑雙語聲播出系統的架構

lip sync

• DDO (digital delay output)
  • To correct audio video sync problems, the video processing circuitry outputs a DDO (digital delay output) signal, which carries information about the amount of delay the video signal experiences due to the processing. The audio synchronizer receives the DDO and in response delays the audio by an equivalent amount, thereby maintaining proper audio video sync.

• ATSC
  • Relative ATSC Document IS-191 - Timing of Sound and Vision for Broadcast Operation

• What is lip sync, and why is it important?
• HDMI's Lip Sync and audio-video synchronization for broadcast and home video