admin-guide/media/dvb_intro.rst

1 .. SPDX-License-Identifier: GPL-2.0
12 structure of DVB-T cards are substantially similar to Analogue TV cards,
16 Television signal. An Analogue TV signal (otherwise known as composite
22 * Tune the receiver to receive a broadcast signal
23 * demodulate the broadcast signal
24 * demultiplex the analogue video signal and analogue audio
25   signal.
29      some countries employ a digital audio signal
30      embedded within the modulated composite analogue signal -
33 * digitize the analogue video signal and make the resulting datastream
38 signal encoded at a resolution of 768x576 24-bit color pixels over 25
39 frames per second - a fair amount of data is generated and must be
43 encoded and compressed form - similar to the form that is used in
46 The purpose of a simple budget digital TV card (DVB-T,C or S) is to
49 * Tune the received to receive a broadcast signal. * Extract the encoded
50   digital datastream from the broadcast signal.
54 analogue TV card spits out an Analogue signal, whereas the tuner on the
56 the signal is already digitised, it is trivial to pass this datastream
96 On this example, we're considering tuning into DVB-T channels in
115 The digital TV Scan utilities (like dvbv5-scan) have use a set of
116 compiled-in defaults for various countries and regions. Those are
117 currently provided as a separate package, called dtv-scan-tables. It's
120     https://git.linuxtv.org/dtv-scan-tables.git/
131 	# T Frequency Bandwidth FEC FEC2 QAM Mode Guard Hier
158     https://git.linuxtv.org/dtv-scan-tables.git/tree/dvb-t/au-Melbourne
163 lock onto. (i.e. any whose signal is strong enough at your antenna).