1 Digital TV (DVB) devices
2 ------------------------
4 Digital TV devices are implemented by several different drivers:
6 - A bridge driver that is responsible to talk with the bus where the other
7 devices are connected (PCI, USB, SPI), bind to the other drivers and
8 implement the digital demux logic (either in software or in hardware);
10 - Frontend drivers that are usually implemented as two separate drivers:
12 - A tuner driver that implements the logic with commands the part of the
13 hardware with is reponsible to tune into a digital TV transponder or
14 physical channel. The output of a tuner is usually a baseband or
15 Intermediate Frequency (IF) signal;
17 - A demodulator driver (a.k.a "demod") that implements the logic with
18 commands the digital TV decoding hardware. The output of a demod is
19 a digital stream, with multiple audio, video and data channels typically
20 multiplexed using MPEG Transport Stream [#f1]_.
22 On most hardware, the frontend drivers talk with the bridge driver using an
25 .. [#f1] Some standards use TCP/IP for multiplexing data, like DVB-H (an
26 abandoned standard, not used anymore) and ATSC version 3.0 current
27 proposals. Currently, the DVB subsystem doesn't implement those standards.