BT856 データシートの表示（PDF） - Unspecified

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BT856

YCrCb or RGB to NTSC/PAL Digital Video Encoder

Unspecified 

CIRCUIT DESCRIPTION

Closed Captioning

Bt856/7

Closed Captioning

The Bt856/7 encodes NTSC/PAL–M closed captioning on scan line 21 and

NTSC/PAL–M extended data services on scan line 284. Four 8-bit registers (sub-

address 0xD0–D4) provide the data while bits D6 and D7 at subaddress 0xDE en-

able display of the data. A logical zero corresponds to the blanking level of 0 IRE,

while a logical one corresponds to 50 IRE above the blanking level.

Closed captioning for PAL–B, D, G, H, I, N, N-Argentina is similar to that for

NTSC. Closed caption encoding is performed for 625-line systems according to

the system proposed by the National Captioning Institute; clock and data timing is

identical to that of NTSC system, except that encoding is provided on lines 22

and 335.

The Bt856/7 generates the clock run-in and appropriate timing automatically.

Pixel inputs are ignored during CC encoding. See FCC Code of Federal Regula-

tions (CFR) 47 Section 15.119 (10/91 edition or later) for programming informa-

tion. EIA608 describes ancillary data applications for Field 2 Line 21 (line 284).

NOTE: Register contents are transferred immediately following the clock run-in,

and must be stable for the duration of the line generated.

Anticopy Process (Bt857 Only)

The anticopy process contained within the Bt857 is implemented according to the

Macrovision revision 6 specification developed by Macrovision in

Mountain View, California. All luminance, chrominance, and composite video

waveforms include the Macrovision anticopy process. The Bt857 incorporates an

anticopy process technology that is protected by U.S. patents and other intellectual

property rights. The anticopy process is licensed for non-commercial, home use

only. Reverse engineering or disassembly is prohibited.

Brooktree cannot ship Bt857 units to any customer until that customer has been

approved by Macrovision. To obtain approval for shipment of Bt857 samples, a

“Macrovision Proprietary Material License Agreement” is required. Contact Mac-

rovision at 415-691-2900 (FAX: 415-691-2999) to facilitate this agreement.

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