1、 GY/T 141-1999 Specifications and methods of measurement on scramble/descramble system used for analog TV signal in CATV systems 1999-11-17 2000-02-01 GY/T 141-1999 GY/T114-1994 GY/T114-1994 G Y /T 141 1999 Specifications and methods of measurement on scramble/descramble system used for analog TV si
2、gnal in CATV systems 1 2 GB 3174-1995 PAL-D GB 7401-1987 GB 9025-1988 30MHz1GHz - GB 11318.13-1996 - GB 12281-1990 GB/T 6510-1996 GB/T 14219-1993 GY/T 106-1999 GY/T 121-1995 GY/T 125-1995 3 3.1 CATV scramble/descramble system used for analog TV signal 3.2 scrambling 3.3 descrambling 3.4 encryption 1
3、999-11-17 2000-02-01 47 GY/T 141-1999 , 3.5 decryption 3.6 scrambler encoder 3.7 descrambler decoder 3.8 baseband scramble 3.9 RF scramble 3.10 analog scramble 3.11 digital scramble 3.12 descrambling information 3.13 decryption information 3.14 addressing 3.16 security 4 4.1 4.1.1 4.1.2 4.1.3 4.2 4.
4、2.1 4.2.2 4.2.3 36dB 4.2.4 50 4.3 48GY/T 141-1999 4.3.1 GB3174 4.3.2 4.3.3 4.3.4 5 5.1 5.1.1 I IIA IIB 5.1.2 1 1 I IIA IIB 1 % 7 10 12 8.3.1 2 7 10 12 8.3.1 3 % 5 6 6 8.3.2 4 ns 45 60 100 8.3.2 5 ( ) dB 57 48 46 8.3.3 6 dB 1 2.5 3 8.3.4 7 ns 50 80 100 8.3.5 8 dB 1.5 3 3 8.3.6 9 % 2 3 4 8.3.7 10 dB 6
5、0 50 45 8.3.8 1 0MHz 5MHz 2 I 40Hz 15KHz IIA IIB 100Hz 10KHz 5.1.3 1 , 4 5.2 GY/T 125 2 49GY/T 141-1999 2 1 MHz 550 2 - 59 3 dBuV 60-75 4 75 5 dB 6 6 dB VHF 8 UHF 6 7 dBuV 74 4 8 dB 14 4 9 kHz 500 10 kHz 6500 20 11 dB 57 12 dB 30 13 dB 57 14 kHz 500 6 GB 9025 GB12281 7 3 3 1 2 3 4 5 6 7 7.1 , 7.2 ,
6、50GY/T 141-1999 7.3 7.4 , 7.5 , 7.6 8 8.1 8.1.1 8.1.2 8.1.3 8.2 8.2.1 I 1 1 I 8.2.2 IIA 2a IIB 2b 2a 51GY/T 141-1999 2b 2 II 8.3 8.3.1 a. 1Vp-p b. 80% RF 70dBuV c. d. . e. GB/T 6510 8.3.2 a. 20T 10T b. 80% RF 70dBuV c. d. 8.3.3 a. 50% b. 1kHz 0dBm c 80% RF 70dBuV d. e. 5MHz 4.43MHz f. 8.3.4 a. 420mV
7、p-p b. 80% RF 70dBuV c. 52GY/T 141-1999 d. e. GB/T 6510 8.3.5 a. sinx/x b. 80% RF 70dBuV c. d. 8.3.6 a. 1kHz b. 1kHz 12.5kHz 1kHz 8.3.7 a. 1kHz 0dBm b. 1kHz 50kHz 8.3.8 a. b. 1kHz 0dBm, c. 1kHz 50kHz 9 9.1 GB7401 4.2 9.2 9.3 53GY/T 141-1999 1998 40 GY/T114-1994 1 GY/T114 94 2 1998 6 1998 10 3 1998 11 12 1999 3 4 9 4 1999 10 1 GY/T114-1994 2 3 3 1 4 4 5 2 4 4.1 4.9 4.1 5 4 1 5 4.11 4.12 , ” , I IIA IIB 54GY/T 141-1999 2 3 SinX/X I 50ns GY/T106-1999 GB/T142-1993 4 5 GY/T125-1995 6 I II GB11318.13-1996 7 IIA GB11318.13-1996 5 7 6 8 55
