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