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8VSB Modulator and CVBS Output Card
Sencore’s HDTV 998Comp is an ATSC/RF, NTSC/Composite television signal output card. It is a single card solution for delivering ATSC/MPEG source material in both Digital and Analog formats. The card provides fully-agile (Channels 2-69) modulated television output based on the ATSC standard. A simultaneous decoded NTSC signal is provided via the composite video outputs. The input to the card is an ATSC MPEG2 transport stream delivered via the PCI interface.
A simple program interface (API), robust low-level software drivers, and sample code in the Software Developer’s Kit (SDK) are provided to simplify integration and minimize start-up time.
- Simultaneous Digital and Analog Signal Output
ATSC/8VSB modulated RF signal on channels 2-69 (tuned through software API). RF level +12dBm, 75 ohm. Simultaneous NTSC signal is delivered via the Composite video outputs. The HDTV 998Comp card will decode and scale ATSC formats up to and including 1080i.
- Robust Software Drivers and API
Robust low-level software drivers, a simple program interface (API), and sample code (SDK) are provided to simplify integration and minimize start-up time.
- Retail Television-Wall video source with simultaneous Digital and Analog formats.
- Digital signage video output card.
ATSC RF OUTPUT
Channel Range: VHF 2-13, UHF 14-69 (User Selectable)
Output Connector: “F” type RF connector
Output Impedance: 75 Ω
Output Level: +12 dBmV (nominal)
MER (SNR): > 27 db
Modulation Type: 8 level VSB for ATSC Broadcast.
A/V Formats: All formats modulated as encoded in MPEG transport stream file.
NTSC COMPOSITE OUTPUT
Video Type: Composite NTSC
Video Connector: “RCA” type connector
Video Impedance: 75 Ω
Display Modes: Letterbox, cropped or full-screen.
Video Scaling: Will decode and scale ATSC formats up to and including 1080i.
Audio Connector: 2 x “RCA” connectors (L,R)
Audio Mode: Stereo
FILE ENCODING REQUIREMENTS
File Type: MPEG2 Transport Stream (TS) file.
TS Multiplex Rate: 19.392658 Mbps +/- 54 bps (ATSC)
TS Packet Size: 188 Bytes
Other File Specs: The TS file begin and end on whole TS packet boundaries. and contain an integer number of TS packets.
Minimum File Size: 16 MB (6.6 secs @ 19.392658 Mbps)
Video Format: Any of 18 ATSC Formats (per ATSC A/53b)
Audio Encoding: AC-3 (per ATSC A52)
Data Tables: MPEG2 compliant Program Specific Information (PSI) tables (PAT and PMT) must be present.
File Play-lists: For best results when concatenating multiple files in a play-list, the following guidelines should be followed:
• Use the same video, audio , and PCR PID assignments for all files.
• Encode video and audio using the same format for all files.
• Begin and end each file with 10 frames of black video.
ATSC PSIP TABLE REQUIREMENTS
Placeholders for a minimal set of ATSC PSIP/PSI tables must be present in order to provide channel information required by consumer receiving devices. (Refer to ATSC docs A65 and A69). PSIP/PSI should be multiplexed into the TS file with the PIDs and repetition intervals shown:
TABLE: PID RATE
PAT: 0 (0x00) 100 ms
PMT: 16 (0x10) 400 ms
MGT: 8187 (0x1FFB) 150 ms
TVCT: 8187 (0x1FFB) 400 ms
STT: 8187 (0x1FFB) 1000 ms
RTT: 8187 (0x1FFB) 60s (1 per file min)
EIT-0: 8144 (0x1FD0) 500 ms
EIT-1: 8145 (0x1FD1) 500 ms
EIT-2: 8146 (0x1FD2) 500 ms
EIT-3: 8147 (0x1FD3) 500 ms
Note: In seamless play mode, the PSIP and PSI sections will be overwritten to ensure a consistent broadcast stream from file to file.
VISUALLY SEAMLESS SPLICING
PCR accuracy < 500ns
PTS/DTS accuracy < 1/90khz
TS Packet continuity Per ISO/IEC 13818-1 2.4.3.3
Table Versions continuity Per ISO/IEC 13818-1 2.4.4
SEAMLESS MODE REQUIREMENTS (in addition to above)
Seamless play mode requires each file to begin and end with a “seamless splice point” (per SMPTE-312M) along with the following restrictions:
Lead in/out frames: No restriction
Fade-in/out: No restriction
Video Format: ATSC “1080i”. The encoded video format must be consistent for all files to be spliced in a play-list.
Programs: Single program w/ one video and one audio service.
Packet ID’s:
PMT PID: 16 (0x010)
PCR PID: 17 (0x011)
Video PID: 17 (0x011)
Audio PID: 20 (0x014)
TS FILE START
The first GOP in the file MUST be CLOSED
TS FILE END
The file should NOT be padded with additional null packets.
VBV METHOD
The VBV_delay at the beginning and end of every file must be the same to ensure that the video buffer does not underflow or overflow at the splice point. This concept is identical to the SPMTE-312M restrictions on “splice_delay”. This requirement can be achieved by using a constant VBV_delay throughout all files, or by using an encoding algorithm that forces VBV_Delay to a consistent value at the beginning and end of all files. VBV_delay can be examined as the delay between the access unit arrival (in PCR time) and the actual stamped decoding time per DTS/PTS.
SOFTWARE
A software developer’s kit (SDK) is available with drivers, libraries and sample applications for Windows based operating systems. A basic file player utility is also available for simple applications.
GENERAL CARD SPECIFICATIONS
RF output synchronization: < 20 mSec.
O/S Compatibility: Win 2000/2003/XP
Product form factor: Single-slot, Universal PCI bus card
PCI Compliance: PCI 2.2, PCI-X 2.0
Size: Approx. 6” x 4” x ¾” (Length x height x clearance)
Weight: ~ 6 ounces
Power consumption: Less than 10W
Operating Temperature: 10 to 40 degrees C (50 to 104 degrees F)
Humidity: Less 95% (non-condensing)
TYPICAL PC REQUIREMENTS
Controller: 2.0 GHz Celeron or better)
Memory: 256 MB or more
Drive type: Any (for single card systems)
Serial ATA (for multi-card systems)