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616 lines
16 KiB
616 lines
16 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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============================== |
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Using the Digital TV Framework |
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============================== |
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Introduction |
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~~~~~~~~~~~~ |
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One significant difference between Digital TV and Analogue TV that the |
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unwary (like myself) should consider is that, although the component |
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structure of DVB-T cards are substantially similar to Analogue TV cards, |
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they function in substantially different ways. |
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The purpose of an Analogue TV is to receive and display an Analogue |
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Television signal. An Analogue TV signal (otherwise known as composite |
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video) is an analogue encoding of a sequence of image frames (25 frames |
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per second in Europe) rasterised using an interlacing technique. |
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Interlacing takes two fields to represent one frame. Therefore, an |
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Analogue TV card for a PC has the following purpose: |
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* Tune the receiver to receive a broadcast signal |
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* demodulate the broadcast signal |
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* demultiplex the analogue video signal and analogue audio |
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signal. |
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.. note:: |
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some countries employ a digital audio signal |
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embedded within the modulated composite analogue signal - |
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using NICAM signaling.) |
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* digitize the analogue video signal and make the resulting datastream |
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available to the data bus. |
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The digital datastream from an Analogue TV card is generated by |
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circuitry on the card and is often presented uncompressed. For a PAL TV |
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signal encoded at a resolution of 768x576 24-bit color pixels over 25 |
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frames per second - a fair amount of data is generated and must be |
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processed by the PC before it can be displayed on the video monitor |
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screen. Some Analogue TV cards for PCs have onboard MPEG2 encoders which |
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permit the raw digital data stream to be presented to the PC in an |
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encoded and compressed form - similar to the form that is used in |
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Digital TV. |
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The purpose of a simple budget digital TV card (DVB-T,C or S) is to |
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simply: |
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* Tune the received to receive a broadcast signal. * Extract the encoded |
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digital datastream from the broadcast signal. |
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* Make the encoded digital datastream (MPEG2) available to the data bus. |
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The significant difference between the two is that the tuner on the |
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analogue TV card spits out an Analogue signal, whereas the tuner on the |
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digital TV card spits out a compressed encoded digital datastream. As |
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the signal is already digitised, it is trivial to pass this datastream |
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to the PC databus with minimal additional processing and then extract |
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the digital video and audio datastreams passing them to the appropriate |
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software or hardware for decoding and viewing. |
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Getting the card going |
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~~~~~~~~~~~~~~~~~~~~~~ |
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The Device Driver API for DVB under Linux will the following |
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device nodes via the devfs filesystem: |
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* /dev/dvb/adapter0/demux0 |
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* /dev/dvb/adapter0/dvr0 |
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* /dev/dvb/adapter0/frontend0 |
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The ``/dev/dvb/adapter0/dvr0`` device node is used to read the MPEG2 |
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Data Stream and the ``/dev/dvb/adapter0/frontend0`` device node is used |
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to tune the frontend tuner module. The ``/dev/dvb/adapter0/demux0`` is |
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used to control what programs will be received. |
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Depending on the card's feature set, the Device Driver API could also |
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expose other device nodes: |
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* /dev/dvb/adapter0/ca0 |
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* /dev/dvb/adapter0/audio0 |
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* /dev/dvb/adapter0/net0 |
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* /dev/dvb/adapter0/osd0 |
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* /dev/dvb/adapter0/video0 |
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The ``/dev/dvb/adapter0/ca0`` is used to decode encrypted channels. The |
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other device nodes are found only on devices that use the av7110 |
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driver, with is now obsoleted, together with the extra API whose such |
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devices use. |
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Receiving a digital TV channel |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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This section attempts to explain how it works and how this affects the |
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configuration of a Digital TV card. |
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On this example, we're considering tuning into DVB-T channels in |
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Australia, at the Melbourne region. |
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The frequencies broadcast by Mount Dandenong transmitters are, |
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currently: |
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Table 1. Transponder Frequencies Mount Dandenong, Vic, Aus. |
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=========== =========== |
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Broadcaster Frequency |
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=========== =========== |
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Seven 177.500 Mhz |
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SBS 184.500 Mhz |
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Nine 191.625 Mhz |
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Ten 219.500 Mhz |
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ABC 226.500 Mhz |
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Channel 31 557.625 Mhz |
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=========== =========== |
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The digital TV Scan utilities (like dvbv5-scan) have use a set of |
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compiled-in defaults for various countries and regions. Those are |
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currently provided as a separate package, called dtv-scan-tables. It's |
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git tree is located at LinuxTV.org: |
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https://git.linuxtv.org/dtv-scan-tables.git/ |
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If none of the tables there suit, you can specify a data file on the |
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command line which contains the transponder frequencies. Here is a |
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sample file for the above channel transponders, in the old "channel" |
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format:: |
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# Data file for DVB scan program |
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# |
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# C Frequency SymbolRate FEC QAM |
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# S Frequency Polarisation SymbolRate FEC |
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# T Frequency Bandwidth FEC FEC2 QAM Mode Guard Hier |
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T 177500000 7MHz AUTO AUTO QAM64 8k 1/16 NONE |
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T 184500000 7MHz AUTO AUTO QAM64 8k 1/8 NONE |
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T 191625000 7MHz AUTO AUTO QAM64 8k 1/16 NONE |
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T 219500000 7MHz AUTO AUTO QAM64 8k 1/16 NONE |
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T 226500000 7MHz AUTO AUTO QAM64 8k 1/16 NONE |
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T 557625000 7MHz AUTO AUTO QPSK 8k 1/16 NONE |
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Nowadays, we prefer to use a newer format, with is more verbose and easier |
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to understand. With the new format, the "Seven" channel transponder's |
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data is represented by:: |
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[Seven] |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = AUTO |
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CODE_RATE_LP = AUTO |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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INVERSION = AUTO |
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For an updated version of the complete table, please see: |
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https://git.linuxtv.org/dtv-scan-tables.git/tree/dvb-t/au-Melbourne |
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When the Digital TV scanning utility runs, it will output a file |
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containing the information for all the audio and video programs that |
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exists into each channel's transponders which the card's frontend can |
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lock onto. (i.e. any whose signal is strong enough at your antenna). |
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Here's the output of the dvbv5 tools from a channel scan took from |
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Melburne:: |
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[ABC HDTV] |
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SERVICE_ID = 560 |
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VIDEO_PID = 2307 |
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AUDIO_PID = 0 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 226500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 3/4 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[ABC TV Melbourne] |
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SERVICE_ID = 561 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 226500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 3/4 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[ABC TV 2] |
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SERVICE_ID = 562 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 226500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 3/4 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[ABC TV 3] |
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SERVICE_ID = 563 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 226500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 3/4 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[ABC TV 4] |
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SERVICE_ID = 564 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 226500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 3/4 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[ABC DiG Radio] |
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SERVICE_ID = 566 |
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VIDEO_PID = 0 |
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AUDIO_PID = 2311 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 226500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 3/4 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital] |
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SERVICE_ID = 1585 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital 1] |
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SERVICE_ID = 1586 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital 2] |
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SERVICE_ID = 1587 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital 3] |
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SERVICE_ID = 1588 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital] |
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SERVICE_ID = 1589 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital 4] |
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SERVICE_ID = 1590 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital] |
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SERVICE_ID = 1591 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN HD] |
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SERVICE_ID = 1592 |
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VIDEO_PID = 514 |
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AUDIO_PID = 0 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[TEN Digital] |
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SERVICE_ID = 1593 |
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VIDEO_PID = 512 |
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AUDIO_PID = 650 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 219500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[Nine Digital] |
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SERVICE_ID = 1072 |
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VIDEO_PID = 513 |
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AUDIO_PID = 660 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 191625000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[Nine Digital HD] |
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SERVICE_ID = 1073 |
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VIDEO_PID = 512 |
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AUDIO_PID = 0 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 191625000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[Nine Guide] |
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SERVICE_ID = 1074 |
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VIDEO_PID = 514 |
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AUDIO_PID = 670 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 191625000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 3/4 |
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CODE_RATE_LP = 1/2 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/16 |
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HIERARCHY = NONE |
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[7 Digital] |
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SERVICE_ID = 1328 |
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VIDEO_PID = 769 |
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AUDIO_PID = 770 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[7 Digital 1] |
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SERVICE_ID = 1329 |
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VIDEO_PID = 769 |
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AUDIO_PID = 770 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[7 Digital 2] |
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SERVICE_ID = 1330 |
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VIDEO_PID = 769 |
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AUDIO_PID = 770 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[7 Digital 3] |
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SERVICE_ID = 1331 |
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VIDEO_PID = 769 |
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AUDIO_PID = 770 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[7 HD Digital] |
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SERVICE_ID = 1332 |
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VIDEO_PID = 833 |
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AUDIO_PID = 834 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[7 Program Guide] |
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SERVICE_ID = 1334 |
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VIDEO_PID = 865 |
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AUDIO_PID = 866 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 177500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[SBS HD] |
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SERVICE_ID = 784 |
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VIDEO_PID = 102 |
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AUDIO_PID = 103 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 536500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[SBS DIGITAL 1] |
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SERVICE_ID = 785 |
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VIDEO_PID = 161 |
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AUDIO_PID = 81 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 536500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[SBS DIGITAL 2] |
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SERVICE_ID = 786 |
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VIDEO_PID = 162 |
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AUDIO_PID = 83 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 536500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[SBS EPG] |
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SERVICE_ID = 787 |
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VIDEO_PID = 163 |
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AUDIO_PID = 85 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 536500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
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GUARD_INTERVAL = 1/8 |
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HIERARCHY = NONE |
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[SBS RADIO 1] |
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SERVICE_ID = 798 |
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VIDEO_PID = 0 |
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AUDIO_PID = 201 |
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DELIVERY_SYSTEM = DVBT |
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FREQUENCY = 536500000 |
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INVERSION = OFF |
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BANDWIDTH_HZ = 7000000 |
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CODE_RATE_HP = 2/3 |
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CODE_RATE_LP = 2/3 |
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MODULATION = QAM/64 |
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TRANSMISSION_MODE = 8K |
|
GUARD_INTERVAL = 1/8 |
|
HIERARCHY = NONE |
|
|
|
[SBS RADIO 2] |
|
SERVICE_ID = 799 |
|
VIDEO_PID = 0 |
|
AUDIO_PID = 202 |
|
DELIVERY_SYSTEM = DVBT |
|
FREQUENCY = 536500000 |
|
INVERSION = OFF |
|
BANDWIDTH_HZ = 7000000 |
|
CODE_RATE_HP = 2/3 |
|
CODE_RATE_LP = 2/3 |
|
MODULATION = QAM/64 |
|
TRANSMISSION_MODE = 8K |
|
GUARD_INTERVAL = 1/8 |
|
HIERARCHY = NONE
|
|
|