msm7653 ETC-unknow, msm7653 Datasheet - Page 30

• Manufacturer Part Number: msm7653
• Description: Ntsc/pal Digital Video Encoder
• Manufacturer: ETC-unknow

¡ Semiconductor
CLOSED CAPTION FUNCTION
The closed caption function based on the NCI standard is available.
The caption information on each line is multiplexed as a 26-cycle signal which is synchronized
at 503 kHz. Each cycle is described below.
Cycles 1 to 7
Cycles 8 to 10
Cycles 11 to 26
The output timing when data is multiplexed by the closed caption function is shown below.
–40IRE
50IRE
20IRE
0IRE
(reference)
10.0 ms
Cycle
1
Clock-Run-in period
Start Code
Caption Information
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
Clock Run in
(reference)
13.9 ms
(reference)
6.0 ms
Code
Start
61.7 ms (reference)
Transition time
Caption signal
50%
with caption information.
the ASCII code bits 0 - 6 and the 7ODD parity bit.
the second byte is multiplexed in cycles 19 to 26,
starting from LSB.
7-cycle clock signal to synchronize caption data
Fixed signal with logical level "001"
2-byte multiplex information with combination of
The first byte is multiplexed in cycles 11 to 18 and
Transition time : ns
100%
16-bit Information
(reference)
31.8 ms
Transition time
MSM7653
50IRE
30/35