Easy HD Expressway!
WWW.HIDES.COM.TW 10
0: 1/2
1: 2/3
2: 3/4
3: 5/6
4: 7/8
ccHDtv DTVCAM guard interval options.
0:1/32
1:1/16
2:1/8
3:1/4
(In 16QAM mode, only Guad Interval 1/4 & 1/8 are supported)
ccHDtv DTVCAM FFT options.
2: 2K
8: 8K
Software adjusts RF output gain.
Range: -25 ~ +5
In Kbps, find details below.
Note: it’s recommended that the [Video Bitrate] should be less
than [modulation data rate] by 20% at least.
If [modulation data rate] is too low, it may cause video glitch.
The modulation data rate ( channel capacity, maximum data bit rate or throughput) varies depending on the
transmission parameters.
The maximum date bit rate can be calculated as below.
Tbandwidth = {1000,000, 2000,000, 3000,000, 4000,000, 5,000,000,6,000,000, 7,000,000,
8,000,000} in Hz for 1~8MHz
Tcode_rate = {1/2, 2/3, 3/4, 5/6, 7/8}
TConstellation = {2, 4, 6} <- QPSK = 2, 16QAM=4, 64QAM = 6
TGuardInterval = {4/5, 8/9, 16/17, 32/33}, 1/4 = 4/5, 1/8 = 8/9, 1/16 => 16/17, 1/32 => 32/33}
2K/8K mode does not matter
Maximum bit rate = 1512 / 2048 * 188 / 204 * 64 / 56 * TBandwidth * Tcode_rate * TConstellation *
TGuardInterval (bps)
= 423 / 544 * TBandwidth * Tcode_rate * TConstellation * TGuardInterval (bps)
Refer to the table shown below.
The channel data rate MUST be larger than the video encoding bit rate.
