40 строки
1.4 KiB
ReStructuredText
40 строки
1.4 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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Digital TV (DVB) devices
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------------------------
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Digital TV devices are implemented by several different drivers:
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- A bridge driver that is responsible to talk with the bus where the other
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devices are connected (PCI, USB, SPI), bind to the other drivers and
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implement the digital demux logic (either in software or in hardware);
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- Frontend drivers that are usually implemented as two separate drivers:
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- A tuner driver that implements the logic which commands the part of
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the hardware responsible for tuning into a digital TV transponder or
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physical channel. The output of a tuner is usually a baseband or
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Intermediate Frequency (IF) signal;
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- A demodulator driver (a.k.a "demod") that implements the logic which
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commands the digital TV decoding hardware. The output of a demod is
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a digital stream, with multiple audio, video and data channels typically
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multiplexed using MPEG Transport Stream [#f1]_.
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On most hardware, the frontend drivers talk with the bridge driver using an
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I2C bus.
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.. [#f1] Some standards use TCP/IP for multiplexing data, like DVB-H (an
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abandoned standard, not used anymore) and ATSC version 3.0 current
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proposals. Currently, the DVB subsystem doesn't implement those standards.
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.. toctree::
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:maxdepth: 1
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dtv-common
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dtv-frontend
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dtv-demux
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dtv-ca
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dtv-net
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