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ST92195D Datasheet(PDF) 169 Page - STMicroelectronics |
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ST92195D Datasheet(HTML) 169 Page - STMicroelectronics |
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169 / 249 page  169/249 ST92195C/D - VPS & WSS SLICER VPS & WSS SLICER (Cont’d) 7.8.6 WSS Data Group Assignments The 14 data bits of the WSS signal are divided into 4 groups. Group 1 contains 4 bits in which the first 3 carry data and the last bit is the odd parity bit for the first three bits. Group 2 contains 4 data bits. Group 3 and Group 4 contain 3 data bits. Group 1 Data: Aspect Ratio Bits Bits 0, 1, and 2 are data bits with Bit 3 contains the odd parity bit. The data bits in Group 1 are defined in Table 30 Group1 Data Bits. Group 2 Data: Enhanced Service Bits B(4) Film bit defined by: '0' is camera mode, '1' is film mode. B(7)-B(5) Reserved. Set to “0”. Group 3 Data: Subtitle Bits B(8) This bit denotes if subtitles are within the teletext. When “0”; Subtitles are NOT found within teletext. When “1”; Subtitles are found within tele- text. B(9) and B(10) are Subtitling mode bits defined in the following table: Group 4 Data: Reserved Bits B(13)-B(11) These bits are reserved. They are set to “0”. Table 30. Group1 Data Bits The number of active lines is only an indication for the exact aspect ratios a=1.33, a=1.56, and a=1.78. (*) The actual transmitted aspect ratio is 4:3 but a 14:9 window should contain all the relevant picture con- tent to encourage a wide screen display on a 16:9 television set. b10 b9 b8 Location of Subtitles x x 0 No Subtitles in teletext 0 0 1 No open subtitles 0 1 1 Subtitles are in the active image area 10 1 Subtitles are out of the active image area 1 1 1 Reserved B3 B2 B1 B0 Aspect Ratio Aspect Ratio Range Format Position Number of Active Lines (estimated) 1 0 0 0 4:3 a<= 1.46 Full Not applicable 576 0 0 0 1 14:9 1.46 < a <= 1.66 Letterbox center 504 0 0 1 0 14:9 1.46 < a <= 1.66 Letterbox top 504 1 0 1 1 16:9 1.66 < a <= 1.90 Letterbox center 430 0 1 0 0 16:9 1.66 < a <= 1.90 Letterbox top 430 1 1 0 1 >16:9 1.90 < a Letterbox center not defined 1 1 1 0 14:9 1.46 < a <= 1.66 Full (*) center 576 0 1 1 1 16:9 1.66 < a <= 1.90 Full Not applicable 576 |
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