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1.. SPDX-License-Identifier: GPL-2.02 3Digital TV (DVB) devices4------------------------5 6Digital TV devices are implemented by several different drivers:7 8- A bridge driver that is responsible to talk with the bus where the other9 devices are connected (PCI, USB, SPI), bind to the other drivers and10 implement the digital demux logic (either in software or in hardware);11 12- Frontend drivers that are usually implemented as two separate drivers:13 14 - A tuner driver that implements the logic which commands the part of15 the hardware responsible for tuning into a digital TV transponder or16 physical channel. The output of a tuner is usually a baseband or17 Intermediate Frequency (IF) signal;18 19 - A demodulator driver (a.k.a "demod") that implements the logic which20 commands the digital TV decoding hardware. The output of a demod is21 a digital stream, with multiple audio, video and data channels typically22 multiplexed using MPEG Transport Stream [#f1]_.23 24On most hardware, the frontend drivers talk with the bridge driver using an25I2C bus.26 27.. [#f1] Some standards use TCP/IP for multiplexing data, like DVB-H (an28 abandoned standard, not used anymore) and ATSC version 3.0 current29 proposals. Currently, the DVB subsystem doesn't implement those standards.30 31 32.. toctree::33 :maxdepth: 134 35 dtv-common36 dtv-frontend37 dtv-demux38 dtv-ca39 dtv-net40