From 6d5c31b581da5df7fc0e35e232a2adba9fbfd2c1 Mon Sep 17 00:00:00 2001 From: Patrick Boettcher Date: Tue, 4 Aug 2009 16:09:35 +0200 Subject: ISDB-T: added bandwidth as an optional parameter From: Patrick Boettcher - added bandwidth as an optional parameter - added changelog - added version Priority: normal Signed-off-by: Patrick Boettcher --- dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API | 38 +++++++++++++++++++++++++++------ 1 file changed, 31 insertions(+), 7 deletions(-) diff --git a/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API b/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API index e2df2b4d9..747183225 100644 --- a/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API +++ b/dvb-spec/ISDB-T_and_ISDB-Tsb_with_S2API @@ -1,5 +1,23 @@ -This document describes shortly what are the possible parameters in -the Linux DVB-API called "S2API" in order to tune an ISDB-T/ISDB-Tsb +Version 1.2 - 2009-08-04 +======================== + +Changelog +========= + +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 @@ -35,18 +53,24 @@ 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 428kHz, 3*428 respectively. As for ISDB-T the +frequency step is 429kHz, 3*429 respectively. As for ISDB-T the central frequency of the channel is expected. -b) DTV_BANDWIDTH_HZ - -Help the front-end, for example, to set up base-band-filters correctly. +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 @@ -192,7 +216,7 @@ 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, DQPSK, QAM_16, QAM_64, DQPSK +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. -- cgit v1.2.3