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authorMauro Carvalho Chehab <mchehab@redhat.com>2009-09-16 22:22:05 -0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-09-18 23:14:36 -0400
commit453d63c6a1afff9aa7e83ac9c3a9dbd6254a1fcd (patch)
treefe2303d074dfc40aa5c8270566a00bf6dad22d5a /Documentation/DocBook/dvb
parentaaeab30f753d9499e04979e2a5a7feadba18c39d (diff)
V4L/DVB (12915): DocBook/media: Add isdb-t documentation
Adds ISDB-T_and_ISDB-Tsb_with_S2API spec converted into DocBook format. The text is authored by Patrick Boettcher, and was converted to DocBook by me. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/dvb')
-rw-r--r--Documentation/DocBook/dvb/.gitignore1
-rw-r--r--Documentation/DocBook/dvb/dvbapi.xml8
-rw-r--r--Documentation/DocBook/dvb/frontend.xml1
-rw-r--r--Documentation/DocBook/dvb/isdbt.xml313
4 files changed, 323 insertions, 0 deletions
diff --git a/Documentation/DocBook/dvb/.gitignore b/Documentation/DocBook/dvb/.gitignore
new file mode 100644
index 000000000000..d7ec32eafac9
--- /dev/null
+++ b/Documentation/DocBook/dvb/.gitignore
@@ -0,0 +1 @@
!*.xml
diff --git a/Documentation/DocBook/dvb/dvbapi.xml b/Documentation/DocBook/dvb/dvbapi.xml
index d53ca4e98e84..4fc5b23470a3 100644
--- a/Documentation/DocBook/dvb/dvbapi.xml
+++ b/Documentation/DocBook/dvb/dvbapi.xml
@@ -30,6 +30,14 @@
30<revhistory> 30<revhistory>
31<!-- Put document revisions here, newest first. --> 31<!-- Put document revisions here, newest first. -->
32<revision> 32<revision>
33<revnumber>2.0.1</revnumber>
34<date>2009-09-16</date>
35<authorinitials>mcc</authorinitials>
36<revremark>
37Added ISDB-T test originally written by Patrick Boettcher
38</revremark>
39</revision>
40<revision>
33<revnumber>2.0.0</revnumber> 41<revnumber>2.0.0</revnumber>
34<date>2009-09-06</date> 42<date>2009-09-06</date>
35<authorinitials>mcc</authorinitials> 43<authorinitials>mcc</authorinitials>
diff --git a/Documentation/DocBook/dvb/frontend.xml b/Documentation/DocBook/dvb/frontend.xml
index 028c9f23f0d4..9d89a7b94fd5 100644
--- a/Documentation/DocBook/dvb/frontend.xml
+++ b/Documentation/DocBook/dvb/frontend.xml
@@ -1763,3 +1763,4 @@ modulation mode which can be one of the following:
1763 </row></tbody></tgroup></informaltable> 1763 </row></tbody></tgroup></informaltable>
1764</section> 1764</section>
1765</section> 1765</section>
1766&sub-isdbt;
diff --git a/Documentation/DocBook/dvb/isdbt.xml b/Documentation/DocBook/dvb/isdbt.xml
new file mode 100644
index 000000000000..39e4696f1f00
--- /dev/null
+++ b/Documentation/DocBook/dvb/isdbt.xml
@@ -0,0 +1,313 @@
1<section id="isdbt">
2 <title>ISDB-T frontend</title>
3 <para>This section describes shortly what are the possible parameters in the Linux
4 DVB-API called "S2API" and now DVB API 5 in order to tune an ISDB-T/ISDB-Tsb
5 demodulator:</para>
6
7 <para>This ISDB-T/ISDB-Tsb API extension should reflect all information
8 needed to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible
9 that some very sophisticated devices won't need certain parameters to
10 tune.</para>
11
12 <para>The information given here should help application writers to know how
13 to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.</para>
14
15 <para>The details given here about ISDB-T and ISDB-Tsb are just enough to
16 basically show the dependencies between the needed parameter values,
17 but surely some information is left out. For more detailed information
18 see the following documents:</para>
19
20 <para>ARIB STD-B31 - "Transmission System for Digital Terrestrial
21 Television Broadcasting" and</para>
22 <para>ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial
23 Television Broadcasting".</para>
24
25 <para>In order to read this document one has to have some knowledge the
26 channel structure in ISDB-T and ISDB-Tsb. I.e. it has to be known to
27 the reader that an ISDB-T channel consists of 13 segments, that it can
28 have up to 3 layer sharing those segments, and things like that.</para>
29
30 <para>Parameters used by ISDB-T and ISDB-Tsb.</para>
31
32 <section id="isdbt-parms">
33 <title>Parameters that are common with DVB-T and ATSC</title>
34
35 <section id="isdbt-freq">
36 <title><constant>DTV_FREQUENCY</constant></title>
37
38 <para>Central frequency of the channel.</para>
39
40 <para>For ISDB-T the channels are usally transmitted with an offset of 143kHz. E.g. a
41 valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of
42 the channel which is 6MHz.</para>
43
44 <para>As in ISDB-Tsb the channel consists of only one or three segments the
45 frequency step is 429kHz, 3*429 respectively. As for ISDB-T the
46 central frequency of the channel is expected.</para>
47 </section>
48
49 <section id="isdbt-bw">
50 <title><constant>DTV_BANDWIDTH_HZ</constant> (optional)</title>
51
52 <para>Possible values:</para>
53
54 <para>For ISDB-T it should be always 6000000Hz (6MHz)</para>
55 <para>For ISDB-Tsb it can vary depending on the number of connected segments</para>
56
57 <para>Note: Hardware specific values might be given here, but standard
58 applications should not bother to set a value to this field as
59 standard demods are ignoring it anyway.</para>
60
61 <para>Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from
62 other parameters (DTV_ISDBT_SB_SEGMENT_IDX,
63 DTV_ISDBT_SB_SEGMENT_COUNT).</para>
64 </section>
65
66 <section id="isdbt-delivery-sys">
67 <title><constant>DTV_DELIVERY_SYSTEM</constant></title>
68
69 <para>Possible values: <constant>SYS_ISDBT</constant></para>
70 </section>
71
72 <section id="isdbt-tx-mode">
73 <title><constant>DTV_TRANSMISSION_MODE</constant></title>
74
75 <para>ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called
76 'mode' in the standard: Mode 1 is 2K, mode 2 is 4K, mode 3 is 8K</para>
77
78 <para>Possible values: <constant>TRANSMISSION_MODE_2K</constant>, <constant>TRANSMISSION_MODE_8K</constant>,
79 <constant>TRANSMISSION_MODE_AUTO</constant>, <constant>TRANSMISSION_MODE_4K</constant></para>
80
81 <para>If <constant>DTV_TRANSMISSION_MODE</constant> is set the <constant>TRANSMISSION_MODE_AUTO</constant> the
82 hardware will try to find the correct FFT-size (if capable) and will
83 use TMCC to fill in the missing parameters.</para>
84
85 <para><constant>TRANSMISSION_MODE_4K</constant> is added at the same time as the other new parameters.</para>
86 </section>
87
88 <section id="isdbt-guard-interval">
89 <title><constant>DTV_GUARD_INTERVAL</constant></title>
90
91 <para>Possible values: <constant>GUARD_INTERVAL_1_32</constant>, <constant>GUARD_INTERVAL_1_16</constant>, <constant>GUARD_INTERVAL_1_8</constant>,
92 <constant>GUARD_INTERVAL_1_4</constant>, <constant>GUARD_INTERVAL_AUTO</constant></para>
93
94 <para>If <constant>DTV_GUARD_INTERVAL</constant> is set the <constant>GUARD_INTERVAL_AUTO</constant> the hardware will
95 try to find the correct guard interval (if capable) and will use TMCC to fill
96 in the missing parameters.</para>
97 </section>
98 </section>
99 <section id="isdbt-new-parms">ISDB-T only parameters
100
101 <section id="isdbt-part-rec">
102 <title><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></title>
103
104 <para><constant>If DTV_ISDBT_SOUND_BROADCASTING</constant> is '0' this bit-field represents whether
105 the channel is in partial reception mode or not.</para>
106
107 <para>If '1' <constant>DTV_ISDBT_LAYERA_*</constant> values are assigned to the center segment and
108 <constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant> has to be '1'.</para>
109
110 <para>If in addition <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'
111 <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> represents whether this ISDB-Tsb channel
112 is consisting of one segment and layer or three segments and two layers.</para>
113
114 <para>Possible values: 0, 1, -1 (AUTO)</para>
115 </section>
116
117 <section id="isdbt-sound-bcast">
118 <title><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></title>
119
120 <para>This field represents whether the other DTV_ISDBT_*-parameters are
121 referring to an ISDB-T and an ISDB-Tsb channel. (See also
122 <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>).</para>
123
124 Possible values: 0, 1, -1 (AUTO)
125 </section>
126
127 <section id="isdbt-sb-ch-id">
128 <title><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></title>
129
130 <para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
131
132 <para>(Note of the author: This might not be the correct description of the
133 <constant>SUBCHANNEL-ID</constant> in all details, but it is my understanding of the technical
134 background needed to program a device)</para>
135
136 <para>An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a
137 set of connected ISDB-Tsb channels. In this set of channels every
138 channel can be received independently. The number of connected
139 ISDB-Tsb segment can vary, e.g. depending on the frequency spectrum
140 bandwidth available.</para>
141
142 <para>Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The
143 broadcaster has several possibilities to put those channels in the
144 air: Assuming a normal 13-segment ISDB-T spectrum he can align the 8
145 segments from position 1-8 to 5-13 or anything in between.</para>
146
147 <para>The underlying layer of segments are subchannels: each segment is
148 consisting of several subchannels with a predefined IDs. A sub-channel
149 is used to help the demodulator to synchronize on the channel.</para>
150
151 <para>An ISDB-T channel is always centered over all sub-channels. As for
152 the example above, in ISDB-Tsb it is no longer as simple as that.</para>
153
154 <para><constant>The DTV_ISDBT_SB_SUBCHANNEL_ID</constant> parameter is used to give the
155 sub-channel ID of the segment to be demodulated.</para>
156
157 <para>Possible values: 0 .. 41, -1 (AUTO)</para>
158 </section>
159
160 <section id="isdbt-sb-seg-idx">
161
162 <title><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></title>
163
164 <para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
165
166 <para><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> gives the index of the segment to be
167 demodulated for an ISDB-Tsb channel where several of them are
168 transmitted in the connected manner.</para>
169
170 <para>Possible values: 0 .. <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> - 1</para>
171
172 <para>Note: This value cannot be determined by an automatic channel search.</para>
173 </section>
174
175 <section id="isdbt-sb-seg-cnt">
176 <title><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></title>
177
178 <para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
179
180 <para><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> gives the total count of connected ISDB-Tsb
181 channels.</para>
182
183 <para>Possible values: 1 .. 13</para>
184
185 <para>Note: This value cannot be determined by an automatic channel search.</para>
186 </section>
187
188 <section id="isdb-hierq-layers">
189 <title>Hierarchical layers</title>
190
191 <para>ISDB-T channels can be coded hierarchically. As opposed to DVB-T in
192 ISDB-T hierarchical layers can be decoded simultaneously. For that
193 reason a ISDB-T demodulator has 3 viterbi and 3 reed-solomon-decoders.</para>
194
195 <para>ISDB-T has 3 hierarchical layers which each can use a part of the
196 available segments. The total number of segments over all layers has
197 to 13 in ISDB-T.</para>
198
199 <section id="isdbt-layer-ena">
200 <title><constant>DTV_ISDBT_LAYER_ENABLED</constant></title>
201
202 <para>Hierarchical reception in ISDB-T is achieved by enabling or disabling
203 layers in the decoding process. Setting all bits of
204 <constant>DTV_ISDBT_LAYER_ENABLED</constant> to '1' forces all layers (if applicable) to be
205 demodulated. This is the default.</para>
206
207 <para>If the channel is in the partial reception mode
208 (<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> = 1) the central segment can be decoded
209 independently of the other 12 segments. In that mode layer A has to
210 have a <constant>SEGMENT_COUNT</constant> of 1.</para>
211
212 <para>In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb
213 according to <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>. <constant>SEGMENT_COUNT</constant> must be filled
214 accordingly.</para>
215
216 <para>Possible values: 0x1, 0x2, 0x4 (|-able)</para>
217
218 <para><constant>DTV_ISDBT_LAYER_ENABLED[0:0]</constant> - layer A</para>
219 <para><constant>DTV_ISDBT_LAYER_ENABLED[1:1]</constant> - layer B</para>
220 <para><constant>DTV_ISDBT_LAYER_ENABLED[2:2]</constant> - layer C</para>
221 <para><constant>DTV_ISDBT_LAYER_ENABLED[31:3]</constant> unused</para>
222 </section>
223
224 <section id="isdbt-layer-fec">
225 <title><constant>DTV_ISDBT_LAYER*_FEC</constant></title>
226
227 <para>Possible values: <constant>FEC_AUTO</constant>, <constant>FEC_1_2</constant>, <constant>FEC_2_3</constant>, <constant>FEC_3_4</constant>, <constant>FEC_5_6</constant>, <constant>FEC_7_8</constant></para>
228 </section>
229
230 <section id="isdbt-layer-mod">
231 <title><constant>DTV_ISDBT_LAYER*_MODULATION</constant></title>
232
233 <para>Possible values: <constant>QAM_AUTO</constant>, QP<constant>SK, QAM_16</constant>, <constant>QAM_64</constant>, <constant>DQPSK</constant></para>
234
235 <para>Note: If layer C is <constant>DQPSK</constant> layer B has to be <constant>DQPSK</constant>. If layer B is <constant>DQPSK</constant>
236 and <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>=0 layer has to be <constant>DQPSK</constant>.</para>
237 </section>
238
239 <section id="isdbt-layer-seg-cnt">
240 <title><constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant></title>
241
242 <para>Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)</para>
243
244 <para>Note: Truth table for <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> and
245 <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> and <constant>LAYER</constant>*_SEGMENT_COUNT</para>
246
247 <informaltable id="isdbt-layer_seg-cnt-table">
248 <tgroup cols="6">
249
250 <tbody>
251 <row>
252 <entry>PR</entry>
253 <entry>SB</entry>
254 <entry>Layer A width</entry>
255 <entry>Layer B width</entry>
256 <entry>Layer C width</entry>
257 <entry>total width</entry>
258 </row>
259
260 <row>
261 <entry>0</entry>
262 <entry>0</entry>
263 <entry>1 .. 13</entry>
264 <entry>1 .. 13</entry>
265 <entry>1 .. 13</entry>
266 <entry>13</entry>
267 </row>
268
269 <row>
270 <entry>1</entry>
271 <entry>0</entry>
272 <entry>1</entry>
273 <entry>1 .. 13</entry>
274 <entry>1 .. 13</entry>
275 <entry>13</entry>
276 </row>
277
278 <row>
279 <entry>0</entry>
280 <entry>1</entry>
281 <entry>1</entry>
282 <entry>0</entry>
283 <entry>0</entry>
284 <entry>1</entry>
285 </row>
286
287 <row>
288 <entry>1</entry>
289 <entry>1</entry>
290 <entry>1</entry>
291 <entry>2</entry>
292 <entry>0</entry>
293 <entry>13</entry>
294 </row>
295 </tbody>
296
297 </tgroup>
298 </informaltable>
299
300 </section>
301
302 <section id="isdbt_layer_t_interl">
303 <title><constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant></title>
304
305 <para>Possible values: 0, 1, 2, 3, -1 (AUTO)</para>
306
307 <para>Note: The real inter-leaver depth-names depend on the mode (fft-size); the values
308 here are referring to what can be found in the TMCC-structure -
309 independent of the mode.</para>
310 </section>
311 </section>
312 </section>
313</section>
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-29 00:24:58 -0500