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| -rw-r--r-- | dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API | 250 |
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diff --git a/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API b/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API deleted file mode 100644 index 2d90df5bb..000000000 --- a/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API +++ /dev/null @@ -1,250 +0,0 @@ -Changelog -========= - -latest: -v1.3 - 2009-08-05 -- added reference to ARIB TR-B14 - -v1.2 - 2009-08-04 -- removed DTV_BANDWIDTH from being a necessary parameter - now optional - -v1.1 - 2009-08-04 -- added DTV_FREQUENCY as a necessary parameter - -v1.0 - 2009-08-03 -- initial draft - -Proposal -======== - -This document describes shortly what are the possible parameters in the Linux -DVB-API called "S2API" and now DVB API 5 in order to tune an ISDB-T/ISDB-Tsb -demodulator: - -This ISDB-T/ISDB-Tsb API extension should reflect all information -needed to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible -that some very sophisticated devices won't need certain parameters to -tune. - -The information given here should help application writers to know how -to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API. - -The details given here about ISDB-T and ISDB-Tsb are just enough to -basically show the dependencies between the needed parameter values, -but surely some information is left out. For more detailed information -see the following documents: - -- ARIB STD-B31 - "Transmission System for Digital Terrestrial - Television Broadcasting" and -- ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial - Television Broadcasting". - -In order to read this document one has to have some knowledge the -channel structure in ISDB-T and ISDB-Tsb. I.e. it has to be known to -the reader that an ISDB-T channel consists of 13 segments, that it can -have up to 3 layer sharing those segments, and things like that. - -Parameters used by ISDB-T and ISDB-Tsb. - -Existing parameters -=================== - -a) DTV_FREQUENCY - -Central frequency of the channel. - -For ISDB-T the channels are usally transmitted with an offset of 143kHz. E.g. a -valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of -the channel which is 6MHz. - -As in ISDB-Tsb the channel consists of only one or three segments the -frequency step is 429kHz, 3*429 respectively. As for ISDB-T the -central frequency of the channel is expected. - -b) DTV_BANDWIDTH_HZ (optional) - -Possible values: - -For ISDB-T it should be always 6000000Hz (6MHz) -For ISDB-Tsb it can vary depending on the number of connected segments - -Note: Hardware specific values might be given here, but standard -applications should not bother to set a value to this field as -standard demods are ignoring it anyway. - -Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from -other parameters (DTV_ISDBT_SB_SEGMENT_IDX, -DTV_ISDBT_SB_SEGMENT_COUNT). - -c) DTV_DELIVERY_SYSTEM - -Possible values: SYS_ISDBT - -d) DTV_TRANSMISSION_MODE - -ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called -'mode' in the standard: Mode 1 is 2K, mode 2 is 4K, mode 3 is 8K - -Possible values: TRANSMISSION_MODE_2K, TRANSMISSION_MODE_8K, - TRANSMISSION_MODE_AUTO, TRANSMISSION_MODE_4K - -If DTV_TRANSMISSION_MODE is set the TRANSMISSION_MODE_AUTO the -hardware will try to find the correct FFT-size (if capable) and will -use TMCC to fill in the missing parameters. - -TRANSMISSION_MODE_4K is added at the same time as the other new parameters. - -e) DTV_GUARD_INTERVAL - -Possible values: GUARD_INTERVAL_1_32, GUARD_INTERVAL_1_16, GUARD_INTERVAL_1_8, - GUARD_INTERVAL_1_4, GUARD_INTERVAL_AUTO - -If DTV_GUARD_INTERVAL is set the GUARD_INTERVAL_AUTO the hardware will -try to find the correct guard interval (if capable) and will use TMCC to fill -in the missing parameters. - -New parameters -============== - -1. DTV_ISDBT_PARTIAL_RECEPTION (1b) - -If DTV_ISDBT_SOUND_BROADCASTING is '0' this bit-field represents whether -the channel is in partial reception mode or not. - -If '1' DTV_ISDBT_LAYERA_* values are assigned to the center segment and -DTV_ISDBT_LAYERA_SEGMENT_COUNT has to be '1'. - -If in addition DTV_ISDBT_SOUND_BROADCASTING is '1' -DTV_ISDBT_PARTIAL_RECEPTION represents whether this ISDB-Tsb channel -is consisting of one segment and layer or three segments and two layers. - -Possible values: 0, 1, -1 (AUTO) - -2. DTV_ISDBT_SOUND_BROADCASTING (1b) - -This field represents whether the other DTV_ISDBT_*-parameters are -referring to an ISDB-T and an ISDB-Tsb channel. (See also -DTV_ISDBT_PARTIAL_RECEPTION). - -Possible values: 0, 1, -1 (AUTO) - -3. DTV_ISDBT_SB_SUBCHANNEL_ID - -This field only applies if DTV_ISDBT_SOUND_BROADCASTING is '1'. - -(Note of the author: This might not be the correct description of the - SUBCHANNEL-ID in all details, but it is my understanding of the technical - background needed to program a device) - -An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a -set of connected ISDB-Tsb channels. In this set of channels every -channel can be received independently. The number of connected -ISDB-Tsb segment can vary, e.g. depending on the frequency spectrum -bandwidth available. - -Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The -broadcaster has several possibilities to put those channels in the -air: Assuming a normal 13-segment ISDB-T spectrum he can align the 8 -segments from position 1-8 to 5-13 or anything in between. - -The underlying layer of segments are subchannels: each segment is -consisting of several subchannels with a predefined IDs. A sub-channel -is used to help the demodulator to synchronize on the channel. - -An ISDB-T channel is always centered over all sub-channels. As for -the example above, in ISDB-Tsb it is no longer as simple as that. - -The DTV_ISDBT_SB_SUBCHANNEL_ID parameter is used to give the -sub-channel ID of the segment to be demodulated. - -Possible values: 0 .. 41, -1 (AUTO) - -4. DTV_ISDBT_SB_SEGMENT_IDX - -This field only applies if DTV_ISDBT_SOUND_BROADCASTING is '1'. - -DTV_ISDBT_SB_SEGMENT_IDX gives the index of the segment to be -demodulated for an ISDB-Tsb channel where several of them are -transmitted in the connected manner. - -Possible values: 0 .. DTV_ISDBT_SB_SEGMENT_COUNT-1 - -Note: This value cannot be determined by an automatic channel search. - -5. DTV_ISDBT_SB_SEGMENT_COUNT - -This field only applies if DTV_ISDBT_SOUND_BROADCASTING is '1'. - -DTV_ISDBT_SB_SEGMENT_COUNT gives the total count of connected ISDB-Tsb -channels. - -Possible values: 1 .. 13 - -Note: This value cannot be determined by an automatic channel search. - -6. Hierarchical layers - -ISDB-T channels can be coded hierarchically. As opposed to DVB-T in -ISDB-T hierarchical layers can be decoded simultaneously. For that -reason a ISDB-T demodulator has 3 viterbi and 3 reed-solomon-decoders. - -ISDB-T has 3 hierarchical layers which each can use a part of the -available segments. The total number of segments over all layers has -to 13 in ISDB-T. - -6.1 DTV_ISDBT_LAYER_ENABLED (3b) - -Hierarchical reception in ISDB-T is achieved by enabling or disabling -layers in the decoding process. Setting all bits of -DTV_ISDBT_LAYER_ENABLED to '1' forces all layers (if applicable) to be -demodulated. This is the default. - -If the channel is in the partial reception mode -(DTV_ISDBT_PARTIAL_RECEPTION=1) the central segment can be decoded -independently of the other 12 segments. In that mode layer A has to -have a SEGMENT_COUNT of 1. - -In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb -according to DTV_ISDBT_PARTIAL_RECEPTION. SEGMENT_COUNT must be filled -accordingly. - -Possible values: 0x1, 0x2, 0x4 (|-able) - -DTV_ISDBT_LAYER_ENABLED[0:0] - layer A -DTV_ISDBT_LAYER_ENABLED[1:1] - layer B -DTV_ISDBT_LAYER_ENABLED[2:2] - layer C -DTV_ISDBT_LAYER_ENABLED[31:3] unused - -6.2 DTV_ISDBT_LAYER*_FEC - -Possible values: FEC_AUTO, FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8, - -6.3 DTV_ISDBT_LAYER*_MODULATION - -Possible values: QAM_AUTO, QPSK, QAM_16, QAM_64, DQPSK - -Note: If layer C is DQPSK layer B has to be DQPSK. If layer B is DQPSK -and DTV_ISDBT_PARTIAL_RECEPTION=0 layer has to be DQPSK. - -6.4 DTV_ISDBT_LAYER*_SEGMENT_COUNT - -Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO) - -Note: Truth table for DTV_ISDBT_SOUND_BROADCASTING and -DTV_ISDBT_PARTIAL_RECEPTION and LAYER*_SEGMENT_COUNT - - PR | SB || layer A width | layer B width | layer C width | total -----+----++---------------+---------------+---------------+------- - 0 | 0 || 1 .. 13 | 1 .. 13 | 1..13 | 13 - 1 | 0 || 1 | 1 .. 13 | 1..13 | 13 - 0 | 1 || 1 | 0 | 0 | 1 - 1 | 1 || 1 | 2 | 0 | 3 - - -6.5 DTV_ISDBT_LAYER*_TIME_INTERLEAVING - -Possible values: 0, 1, 2, 3, -1 (AUTO) - -Note: The real inter-leaver depth-names depend on the mode (fft-size); the values -here are referring to what can be found in the TMCC-structure - -independent of the mode. |