Used internally. A GET/SET operation for it won’t change or return anything.
Interpret the cache of data, build either a traditional frontend tunerequest so we can pass validation in the FE_SET_FRONTEND ioctl.
Reset a cache of data specific to the frontend here. This does not effect hardware.
Frequency of the digital TV transponder/channel.
Note
Specifies the frontend modulation type for delivery systems that supports more than one modulation type. The modulation can be one of the types defined by enum fe_modulation.
Most of the digital TV standards currently offers more than one possible modulation (sometimes called as “constellation” on some standards). This enum contains the values used by the Kernel. Please note that not all modulations are supported by a given standard.
| ID | Description |
|---|---|
QPSK |
QPSK modulation |
QAM_16 |
16-QAM modulation |
QAM_32 |
32-QAM modulation |
QAM_64 |
64-QAM modulation |
QAM_128 |
128-QAM modulation |
QAM_256 |
256-QAM modulation |
QAM_AUTO |
Autodetect QAM modulation |
VSB_8 |
8-VSB modulation |
VSB_16 |
16-VSB modulation |
PSK_8 |
8-PSK modulation |
APSK_16 |
16-APSK modulation |
APSK_32 |
32-APSK modulation |
DQPSK |
DQPSK modulation |
QAM_4_NR |
4-QAM-NR modulation |
Bandwidth for the channel, in HZ.
Possible values: 1712000, 5000000, 6000000, 7000000, 8000000, 10000000.
Note
Specifies if the frontend should do spectral inversion or not.
This parameter indicates if spectral inversion should be presumed or not. In the automatic setting (INVERSION_AUTO) the hardware will try to figure out the correct setting by itself. If the hardware doesn’t support, the DVB core will try to lock at the carrier first with inversion off. If it fails, it will try to enable inversion.
| ID | Description |
|---|---|
INVERSION_OFF |
Don’t do spectral band inversion. |
INVERSION_ON |
Do spectral band inversion. |
INVERSION_AUTO |
Autodetect spectral band inversion. |
Currently not implemented.
Digital TV symbol rate, in bauds (symbols/second). Used on cable standards.
Used cable/satellite transmissions. The acceptable values are:
| ID | Description |
|---|---|
FEC_NONE |
No Forward Error Correction Code |
FEC_AUTO |
Autodetect Error Correction Code |
FEC_1_2 |
Forward Error Correction Code 1/2 |
FEC_2_3 |
Forward Error Correction Code 2/3 |
FEC_3_4 |
Forward Error Correction Code 3/4 |
FEC_4_5 |
Forward Error Correction Code 4/5 |
FEC_5_6 |
Forward Error Correction Code 5/6 |
FEC_6_7 |
Forward Error Correction Code 6/7 |
FEC_7_8 |
Forward Error Correction Code 7/8 |
FEC_8_9 |
Forward Error Correction Code 8/9 |
FEC_9_10 |
Forward Error Correction Code 9/10 |
FEC_2_5 |
Forward Error Correction Code 2/5 |
FEC_3_5 |
Forward Error Correction Code 3/5 |
The voltage is usually used with non-DiSEqC capable LNBs to switch the polarzation (horizontal/vertical). When using DiSEqC epuipment this voltage has to be switched consistently to the DiSEqC commands as described in the DiSEqC spec.
| ID | Description |
|---|---|
SEC_VOLTAGE_13 |
Set DC voltage level to 13V |
SEC_VOLTAGE_18 |
Set DC voltage level to 18V |
SEC_VOLTAGE_OFF |
Don’t send any voltage to the antenna |
Currently not used.
Sets DVB-S2 pilot
| ID | Description |
|---|---|
PILOT_ON |
Pilot tones enabled |
PILOT_OFF |
Pilot tones disabled |
PILOT_AUTO |
Autodetect pilot tones |
Sets DVB-S2 rolloff
| ID | Description |
|---|---|
ROLLOFF_35 |
Roloff factor: α=35% |
ROLLOFF_20 |
Roloff factor: α=20% |
ROLLOFF_25 |
Roloff factor: α=25% |
ROLLOFF_AUTO |
Auto-detect the roloff factor. |
Currently not implemented.
Currently not implemented.
Currently not implemented.
Specifies the type of Delivery system
Possible values:
| ID | Description |
|---|---|
SYS_UNDEFINED |
Undefined standard. Generally, indicates an error |
SYS_DVBC_ANNEX_A |
Cable TV: DVB-C following ITU-T J.83 Annex A spec |
SYS_DVBC_ANNEX_B |
Cable TV: DVB-C following ITU-T J.83 Annex B spec (ClearQAM) |
SYS_DVBC_ANNEX_C |
Cable TV: DVB-C following ITU-T J.83 Annex C spec |
SYS_ISDBC |
Cable TV: ISDB-C (no drivers yet) |
SYS_DVBT |
Terrestral TV: DVB-T |
SYS_DVBT2 |
Terrestral TV: DVB-T2 |
SYS_ISDBT |
Terrestral TV: ISDB-T |
SYS_ATSC |
Terrestral TV: ATSC |
SYS_ATSCMH |
Terrestral TV (mobile): ATSC-M/H |
SYS_DTMB |
Terrestrial TV: DTMB |
SYS_DVBS |
Satellite TV: DVB-S |
SYS_DVBS2 |
Satellite TV: DVB-S2 |
SYS_TURBO |
Satellite TV: DVB-S Turbo |
SYS_ISDBS |
Satellite TV: ISDB-S |
SYS_DAB |
Digital audio: DAB (not fully supported) |
SYS_DSS |
Satellite TV:”DSS (not fully supported) |
SYS_CMMB |
Terrestral TV (mobile):CMMB (not fully supported) |
SYS_DVBH |
Terrestral TV (mobile): DVB-H (standard deprecated) |
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)
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)
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)
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.
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.
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.
There are 3 parameter sets, for Layers A, B and C.
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.
Only the values of the first 3 bits are used. Other bits will be silently ignored:
DTV_ISDBT_LAYER_ENABLED bit 0: layer A enabled
DTV_ISDBT_LAYER_ENABLED bit 1: layer B enabled
DTV_ISDBT_LAYER_ENABLED bit 2: layer C enabled
DTV_ISDBT_LAYER_ENABLED bits 3-31: unused
Possible values: FEC_AUTO, FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8
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.
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[A-C]_SEGMENT_COUNT
| PR | SB | Layer A width | Layer B width | Layer C width | total width |
| 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 | 13 |
Valid values: 0, 1, 2, 4, -1 (AUTO)
when DTV_ISDBT_SOUND_BROADCASTING is active, value 8 is also valid.
Note: The real time interleaving length depends on the mode (fft-size). The values here are referring to what can be found in the TMCC-structure, as shown in the table below.
| DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING | Mode 1 (2K FFT) | Mode 2 (4K FFT) | Mode 3 (8K FFT) |
| 0 | 0 | 0 | 0 |
| 1 | 4 | 2 | 1 |
| 2 | 8 | 4 | 2 |
| 4 | 16 | 8 | 4 |
Version number of the FIC (Fast Information Channel) signaling data.
FIC is used for relaying information to allow rapid service acquisition by the receiver.
Possible values: 0, 1, 2, 3, ..., 30, 31
Parade identification number
A parade is a collection of up to eight MH groups, conveying one or two ensembles.
Possible values: 0, 1, 2, 3, ..., 126, 127
Number of MH groups per MH subframe for a designated parade.
Possible values: 1, 2, 3, 4, 5, 6, 7, 8
Total number of MH groups including all MH groups belonging to all MH parades in one MH subframe.
Possible values: 0, 1, 2, 3, ..., 30, 31
Reed Solomon (RS) frame mode.
Possible values are:
| ID | Description |
|---|---|
ATSCMH_RSFRAME_PRI_ONLY |
Single Frame: There is only a primary RS Frame for all Group Regions. |
ATSCMH_RSFRAME_PRI_SEC |
Dual Frame: There are two separate RS Frames: Primary RS Frame for Group Region A and B and Secondary RS Frame for Group Region C and D. |
Reed Solomon(RS) frame ensemble.
Possible values are:
| ID | Description |
|---|---|
ATSCMH_RSFRAME_ENS_PRI |
Primary Ensemble. |
AATSCMH_RSFRAME_PRI_SEC |
Secondary Ensemble. |
AATSCMH_RSFRAME_RES |
Reserved. Shouldn’t be used. |
Reed Solomon (RS) code mode (primary).
Possible values are:
| ID | Description |
|---|---|
ATSCMH_RSCODE_211_187 |
Reed Solomon code (211,187). |
ATSCMH_RSCODE_223_187 |
Reed Solomon code (223,187). |
ATSCMH_RSCODE_235_187 |
Reed Solomon code (235,187). |
ATSCMH_RSCODE_RES |
Reserved. Shouldn’t be used. |
Reed Solomon (RS) code mode (secondary).
Possible values are the same as documented on enum atscmh_rs_code_mode:
Series Concatenated Convolutional Code Block Mode.
Possible values are:
| ID | Description |
|---|---|
ATSCMH_SCCC_BLK_SEP |
Separate SCCC: the SCCC outer code mode shall be set independently for each Group Region (A, B, C, D) |
ATSCMH_SCCC_BLK_COMB |
Combined SCCC: all four Regions shall have the same SCCC outer code mode. |
ATSCMH_SCCC_BLK_RES |
Reserved. Shouldn’t be used. |
Series Concatenated Convolutional Code Rate.
Possible values are:
| ID | Description |
|---|---|
ATSCMH_SCCC_CODE_HLF |
The outer code rate of a SCCC Block is 1/2 rate. |
ATSCMH_SCCC_CODE_QTR |
The outer code rate of a SCCC Block is 1/4 rate. |
ATSCMH_SCCC_CODE_RES |
to be documented. |
Series Concatenated Convolutional Code Rate.
Possible values are the same as documented on enum atscmh_sccc_code_mode.
Series Concatenated Convolutional Code Rate.
Possible values are the same as documented on enum atscmh_sccc_code_mode.
Series Concatenated Convolutional Code Rate.
Possible values are the same as documented on enum atscmh_sccc_code_mode.
Returns the major/minor version of the DVB API
Used on terrestrial transmissions. The acceptable values are the ones described at fe_transmit_mode.
Used on terrestrial transmissions. The acceptable values are the ones described at fe_transmit_mode.
Possible values are:
| ID | Description |
|---|---|
GUARD_INTERVAL_AUTO |
Autodetect the guard interval |
GUARD_INTERVAL_1_128 |
Guard interval 1/128 |
GUARD_INTERVAL_1_32 |
Guard interval 1/32 |
GUARD_INTERVAL_1_16 |
Guard interval 1/16 |
GUARD_INTERVAL_1_8 |
Guard interval 1/8 |
GUARD_INTERVAL_1_4 |
Guard interval 1/4 |
GUARD_INTERVAL_19_128 |
Guard interval 19/128 |
GUARD_INTERVAL_19_256 |
Guard interval 19/256 |
GUARD_INTERVAL_PN420 |
PN length 420 (1/4) |
GUARD_INTERVAL_PN595 |
PN length 595 (1/6) |
GUARD_INTERVAL_PN945 |
PN length 945 (1/9) |
Notes:
1) 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.
2) Intervals 1/128, 19/128 and 19/256 are used only for DVB-T2 at present
Specifies the number of carriers used by the standard. This is used only on OFTM-based standards, e. g. DVB-T/T2, ISDB-T, DTMB
| ID | Description |
|---|---|
TRANSMISSION_MODE_AUTO |
Autodetect transmission mode. The hardware will try to find the correct FFT-size (if capable) to fill in the missing parameters. |
TRANSMISSION_MODE_1K |
Transmission mode 1K |
TRANSMISSION_MODE_2K |
Transmission mode 2K |
TRANSMISSION_MODE_8K |
Transmission mode 8K |
TRANSMISSION_MODE_4K |
Transmission mode 4K |
TRANSMISSION_MODE_16K |
Transmission mode 16K |
TRANSMISSION_MODE_32K |
Transmission mode 32K |
TRANSMISSION_MODE_C1 |
Single Carrier (C=1) transmission mode (DTMB) |
TRANSMISSION_MODE_C3780 |
Multi Carrier (C=3780) transmission mode (DTMB) |
Notes:
1) 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
2) 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.
Frontend hierarchy
| ID | Description |
|---|---|
HIERARCHY_NONE |
No hierarchy |
HIERARCHY_AUTO |
Autodetect hierarchy (if supported) |
HIERARCHY_1 |
Hierarchy 1 |
HIERARCHY_2 |
Hierarchy 2 |
HIERARCHY_4 |
Hierarchy 4 |
DVB-S2, DVB-T2 and ISDB-S support the transmission of several streams on a single transport stream. This property enables the DVB driver to handle substream filtering, when supported by the hardware. By default, substream filtering is disabled.
For DVB-S2 and DVB-T2, the valid substream id range is from 0 to 255.
For ISDB, the valid substream id range is from 1 to 65535.
To disable it, you should use the special macro NO_STREAM_ID_FILTER.
Note: any value outside the id range also disables filtering.
Obsolete, replaced with DTV_STREAM_ID.
A Multi standard frontend needs to advertise the delivery systems provided. Applications need to enumerate the provided delivery systems, before using any other operation with the frontend. Prior to it’s introduction, FE_GET_INFO was used to determine a frontend type. A frontend which provides more than a single delivery system, FE_GET_INFO doesn’t help much. Applications which intends to use a multistandard frontend must enumerate the delivery systems associated with it, rather than trying to use FE_GET_INFO. In the case of a legacy frontend, the result is just the same as with FE_GET_INFO, but in a more structured format
Time interleaving to be used. Currently, used only on DTMB.
| ID | Description |
|---|---|
INTERLEAVING_NONE |
No interleaving. |
INTERLEAVING_AUTO |
Auto-detect interleaving. |
INTERLEAVING_240 |
Interleaving of 240 symbols. |
INTERLEAVING_720 |
Interleaving of 720 symbols. |
Low-noise amplifier.
Hardware might offer controllable LNA which can be set manually using that parameter. Usually LNA could be found only from terrestrial devices if at all.
Possible values: 0, 1, LNA_AUTO
0, LNA off
1, LNA on
use the special macro LNA_AUTO to set LNA auto