FMUSER INTERNATIONAL GROUP INC.
广州市汉婷生物技术开发有限公司
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coding rate this modulator can transport is limitary when the device works as
different constellations and symbol rates.
User can refer to the formula as below:
Max_input_bitrate = Symb_rate*qam_bits*188/204
Max input bit rate: the maximum effective inputting coding rate
Symb rate: the symbol rate
Qam_bits: the QAM bit when device works as current constellation (user can
refer to the following table when device works as 6.875Msps symbol rate):
Constellation
qam_bits
(
bit/symb
)
Symb_rate
(
Msps
)
Max_input_bitrate
(
Mbps
)
16
4
6.875
25.343
32
5
31.679
64
6
38.015
128
7
44.350
256
8
50.686
4.2.2.4 Symbol rate
After entering the submenu by pressing ENTER key, user can set the symbol rate
by moving the UP/DOWN/LEFT/RIGHT key and then repressing ENTER to
confirm.
The symbol rate range is 2.5Msps~4.66Msps, 5.0Msps~8.0Msps
,
1ksps stepping for
J.83A/DVB-C and J.83C.
4.3.2.5 Frequency point bandwidth
After entering the submenu by pressing ENTER key, user can set the bandwidth
►
1.4 Symbol Rate J.83A/DVB-C
6.875Msps
►
1.4 Symbol Rate J.83B
5.057Msps
►
1.4 Symbol Rate J.83C
6.875Msps