有朋友从美国快回来了 准备顺路带点东西 看上一个机子 本身只带S2的头子   还有个空余插槽还需要单独配一个DVB-C的头子

但是相应品牌只有一种 而且是葡萄牙生产给巴西用的 害怕拿回来用不上

咨询下大家 谢谢

Quick Overviewespecialmente diseñado para Brasil y Latin America
DVB-C stands for Digital Video Broadcasting - Cable and it is the DVB European consortium standard for the broadcast transmission of digital television over cable. This system transmits an MPEG-2 or MPEG-4 family digital audio/video stream, using a QAM modulation with channel coding.

Product DescriptionTechnical description of the DVB-C transmitter
Scheme of a DVB-C transmission system
With reference to the figure, a short description of the single processing blocks follows.
Source coding and MPEG-2 multiplexing (MUX): video, audio, and data streams are multiplexed into an MPEG program stream (MPEG-PS). One or more MPEG-PSs are joined together into an MPEG transport stream (MPEG-TS). This is the basic digital stream which is being transmitted and received by home set top boxes (STB). Allowed bitrates for the transported MPEG-2 depend on a number of modulation parameters: it can range from about 6 to about 64 Mbit/s (see the bottom figure for a complete listing).
MUX adaptation and energy dispersal: the MPEG-TS is identified as a sequence of data packets, of fixed length (188 bytes). With a technique called energy dispersal, the byte sequence is decorrelated.
External encoder: a first level of protection is applied to the transmitted data, using a nonbinary block code, a Reed-Solomon RS (204, 188) code, allowing the correction of up to a maximum of 8 wrong bytes for each 188-byte packet.
External interleaver: convolutional interleaving is used to rearrange the transmitted data sequence, such way it becomes more rugged to long sequences of errors.
Byte/m-tuple conversion: data bytes are encoded into bit m-tuples (m = 4, 5, 6, 7, or 8).
Differential coding: In order to get a rotation-invariant constellation, this unit shall apply a differential encoding of the two Most Significant Bits (MSBs) of each symbol.
QAM Mapper: the bit sequence is mapped into a base-band digital sequence of complex symbols. There are 5 allowed modulation modes: 16-QAM, 32-QAM, 64-QAM, 128-QAM, 256-QAM.
Base-band shaping: the QAM signal is filtered with a raised-cosine shaped filter, in order to remove mutual signal interference at the receiving side.
DAC and front-end: the digital signal is transformed into an analog signal, with a digital-to-analog converter (DAC), and then modulated to radio frequency by the RF front-end.
Available bitrates for a DVB-C system
Modulation Bandwidth (MHz)
2 4 5 8 10
16QAM 6,41 12,82 19,23 25,64 32,05
32QAM 8,01 16,03 24,04 32,05 40,07
64QAM 9,92 19,23 28,85 38,47 48,08
128QAM 11,22 22,44 33,66 44,88 56,10
256QAM 12,82 25,64 38,47 51,29 64,11