Demodulator

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A '''Demodulator''' (short '''Demod''') recovers (demodulates) the original information from the received and downconverted RF signal. In case of digital TV this is the [[MPEG2 Transport Stream]], in case of analogue TV the [[Wikipedia:Composite video|Composite Signal]].
+
A '''Demodulator''' (short '''Demod''') recovers (demodulates) the original information from an intermediate frequency (IF) that is provided to it by a [[tuner]].  The type of demodulator IC used for this task of information recovery is specific and dependent upon the nature of the signal transmission scheme involved.  
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Digital Demodulators also perform [[Wikipedia:Forward Error Correction|Forward Error Correction]] ([[Wikipedia:Convolutional Code|Convolutional Viterbi-]] and [[Wikipedia:Reed-Solomon_error_correction|Block-Reed-Solomon-Decoding]]).
+
In the case of [[analog TV]], the IF inputted into the demodulator contains the [[Wikipedia:Composite video|composite signal]] that was originally modulated onto the [[RF|RF carrier]].  After recovery, the demodulator outputs a CVSB signal, which will then need to be digitized through sampling techniques performed by a [[decoder|A/V decoder]].  
 +
In the case of [[digital TV]] transmission schemes, the IF inputted into the demodulator contains a [[MPEG-2 Transport Stream]] (TS) that was originally modulated onto the RF carrier.  In the process of recovering that TS, digital demodulators will perform [[Wikipedia:Forward Error Correction|Forward Error Correction]] ([[Wikipedia:Convolutional Code|Convolutional Viterbi-]] and [[Wikipedia:Reed-Solomon_error_correction|Block-Reed-Solomon-Decoding]]).  This whole process is sometimes referred to as RF-to-bits, for, unlike the case with analog IF demodulators, the recovered signal outputted from the digital demodulator is already a digital bit stream; specifically a TS.  The TS will in turn be sent to a decoder  in order to display (and, depending upon what format the underlying video content contained within the TS was encoded with, this could be a MPEG-2 or MPEG-4 decoder ... and either [[Hardware or Software Decoder?|hardware or software based]]).
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{| border="1" cellpadding="5" cellspacing="0" align="center"
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==Demodulator Chipsets==
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|+'''Some Examples for Digital Demods are'''
+
 
 +
===Analogue IF Demodulators===
 +
 
 +
{| class="wikitable sortable"  
 +
|+'''A Sortable List of Analog IF Demodulators'''
|-
|-
-
! style="background:#ffdead;" | Model
+
! Vendor !! Model !! Standards  !! Linux Support !! class="unsortable"| Comments
-
! style="background:#ffdead;" | Type and Vendor
+
|-
|-
-
! style="background:#efefef;" | [[NXT6000]]
+
| [[Philips Semiconductors|Philips]] || TDA9887 || NTSC || {{Yes}} || -
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[ATI/AMD|ATI]]
+
|-  
 +
| [[Xceive]] || [[Xceive XC3028|XC3028]] || NTSC, PAL || er, somewhat || firmware galore
|-
|-
-
! style="background:#efefef;" | [[AT76C651]]
+
| [[Xceive]] || [[Xceive XC5000|XC5000]] || NTSC, PAL || er, somewhat || firmware galore
-
! [[DVB-C]]/[[QAM]] Demod produced by [[Atmel Corporation]]
+
|}
 +
... and so on ...
 +
 
 +
===Digital Demodulators===
 +
{| class="wikitable sortable"
 +
|+'''A Sortable List of Digital Demodulators'''
|-
|-
-
! style="background:#efefef;" | [[CX22700]]
+
! Vendor !! Model !! Standard  !! Linux Support !! class="unsortable"| Comments
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[Conexant Systems, Inc.]]
+
|-
|-
-
! style="background:#efefef;" | [[CX24110]]
+
| [[Afatech]] || [[Afatech AF9005|AF9005]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]. A combo USB bridge & demod IC
-
! [[DVB-S]]/[[QPSK]] Demod produced by [[Conexant Systems, Inc.]]
+
|-
|-
-
! style="background:#efefef;" | [[DIB3000M]]
+
| [[Afatech]] || [[Afatech AF9015|AF9015]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]. A combo USB bridge & demod IC
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[DiBcom]]
+
|-
|-
-
! style="background:#efefef;" | [[LSI L64781|L64781]]
+
| [[Afatech]] || [[Afatech AF9035|AF9035]] || [[DVB-T]] ||  {{Yes}} || ; firmware required
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[LSI Logic Corporation]]
+
|-
|-
-
! style="background:#efefef;" | [[LSI L64782|L64782]]
+
| [[ATI/AMD]] || [[ATI/AMD Nxt2000|Nxt2000]] || [[ATSC]] || {{Unknown}} || Supports [[8-VSB]], [[QAM]]; firmware required
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[LSI Logic Corporation]]
+
|-
|-
-
! style="background:#efefef;" | [[MT8872]]/[[SP8872]]
+
| [[ATI/AMD]] || [[ATI/AMD Nxt2002|Nxt2002]] || [[ATSC]] ||  {{Yes}} || Supports [[8-VSB]], [[QAM]]; firmware required
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[Microtune]]
+
|-
|-
-
! style="background:#efefef;" | [[Philips TDA10021|TDA10021]]
+
| [[ATI/AMD]] || [[ATI/AMD Nxt2004|Nxt2004]] || [[ATSC]] ||  {{Yes}} || Supports [[8-VSB]], [[QAM]]; firmware required
-
! [[DVB-C]]/[[QAM]] Demod produced by [[Philips Semiconductors]]
+
|-
 +
| [[ATI/AMD]] ||  [[ATI/AMD NXT6000|NXT6000]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
 +
|-
 +
| [[ATI/AMD]] || [[ATI/AMD Theater 31x|Theater 31x]] || [[ATSC]] || {{no}} || Supports [[8-VSB]], [[QAM]]
|-
|-
-
! style="background:#efefef;" | [[Philips TDA10045|TDA10045]]
+
| [[Atmel Corporation|Atmel]] || [[Atmel AT76C651|AT76C651]] || DVB-C || {{Unknown}} || supports [[QAM]]
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[Philips Semiconductors]]
+
|-
|-
-
! style="background:#efefef;" | [[Philips TDA10046|TDA10046]]
+
| [[Commsonic]] || [[Commsonic CMS0014|CMS0014]] || [[DVB-S2]] || {{Unknown}} || [[QPSK]] 8PSK, 16APSK and 32APSK
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[Philips Semiconductors]]
+
|-
|-
-
! style="background:#efefef;" | [[Philips TDA8083|TDA8083]]
+
| [[Conexant]] || [[Conexant CX24116|CX24116]] || [[DVB-S2]] || {{Unknown}} ||
-
! [[DVB-S]]/[[QPSK]] Demod produced by [[Philips Semiconductors]]
+
|-
|-
-
! style="background:#efefef;" | [[SP8870]]
+
| [[Conexant]] || [[Conexant CX22700|CX22700]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
-
! [[DVB-T]]/[[COFDM]] Demod produced by [[Spase]]
+
|-
|-
-
! style="background:#efefef;" | [[STV0297]]
+
| [[Conexant]] || [[Conexant CX24110|CX24110]] || [[DVB-S]] ||  {{Yes}} || supports  [[QPSK]]
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! [[DVB-C]]/[[QAM]] Demod produced by [[ST Semiconductors]]
+
|-
|-
-
! style="background:#efefef;" | [[STV0299]]
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| [[DiBcom]] || [[DiBcom DIB3000M|DIB3000M]] || [[DVB-T]] ||  {{Yes}} || supports [[COFDM]]
-
! [[DVB-S]]/[[QPSK]] Demod produced by [[ST Semiconductors]]
+
|-
|-
-
! style="background:#efefef;" | [[VES1893]]
+
| [[DiBcom]] || [[DiBcom DIB3000P|DIB3000P]] || [[DVB-T]] ||  {{Yes}} || supports ?
-
! [[DVB-S]]/[[QPSK]] Demod produced by [[VLSI Technology]]
+
|-
|-
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! style="background:#efefef;" | [[VES1993]]
+
| [[DiBcom]] || [[DiBcom DiB7xxx|DiB7xxx]] || [[DVB-T]] ||  {{Yes}} || supports ?
-
! [[DVB-S]]/[[QPSK]] Demod produced by [[VLSI Technology]]
+
|-
|-
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! style="background:#efefef;" | [[VES1820]]
+
| [[Tai-Hui|E3C]] || [[E3C EC168|EC168]] || [[DVB-T]] || exp ||
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! [[DVB-C]]/[[QAM]] Demod produced by [[VLSI Technology]]
+
|-
|-
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! style="background:#efefef;" | [[MT312]]
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| [[Eccincorp]] || [[Eccincorp ECC3100 (SkyPHY)|ECC3100 (SkyPHY)]] || [[DVB-S2]] || {{Unknown}} ||
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! [[DVB-S]]/[[DSS]]/[[QPSK]] Demod produced by [[Zarlink Semiconductor]]
+
|-
|-
-
! style="background:#efefef;" | [[MT352]]
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| [[Fujitsu]] || [[Fujitsu MB86A16|MB86A16]] || [[DVB-S]] || @mantis source (?) || supports [[QPSK]]
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! [[DVB-S]]/[[DSS]]/[[QPSK]] Demod produced by [[Zarlink Semiconductor]]
+
|-
|-
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! style="background:#efefef;" | [[ZL10312]]
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| [[Intel]] || || || || there are several intel demods that could be added here
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! [[DVB-S]]/[[DSS]]/[[QPSK]] Demod produced by [[Zarlink Semiconductor]]
+
|-
|-
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! style="background:#efefef;" | [[ZL10313]]
+
| [[LG]] || [[LG DT3302|DT3302]] || [[ATSC]]||  {{Yes}} || Supports [[8-VSB]], [[QAM]]
-
! [[DVB-S]]/[[DSS]]/[[QPSK]] Demod produced by [[Zarlink Semiconductor]]
+
|-
|-
 +
| [[LG]] || [[LG DT3303|DT3303]] || [[ATSC]] ||  {{Yes}} || Supports [[8-VSB]], [[QAM]]
 +
|-
 +
| [[LSI Logic Corporation]] || [[LSI L64781|L64781]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
 +
|-
 +
| [[LSI Logic Corporation]] || [[LSI L64782|L64782]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
 +
|-
 +
| [[Microtune]] || [[Microtune MT8872|MT8872]] || [[DVB-T]] || {{Unknown}} || [[COFDM]]
 +
|-
 +
| [[Montage]] || [[Montage M88DS3000|M88DS3000]] || [[DVB-S2]] || {{Yes}} || [[QPSK]] [[8PSK]], [[16APSK]] and [[32APSK]]
 +
|-
 +
| [[Montage]] || [[Montage M88DS3000|M88DS3002]] || [[DVB-S2]] || {{Yes}} || [[QPSK]] [[8PSK]], [[16APSK]] and [[32APSK]]
 +
|-
 +
| [[Oren]] || [[Oren or51211|or51211]] || [[ATSC]] ||  {{Yes}} || supports [[8-VSB]] and [[QAM]]; firmware required, however, no QAM capable firmware is known
 +
|-
 +
| [[Oren]] || [[Oren or51132|or51132]] || [[ATSC]] ||  {{Yes}} || supports [[8-VSB]] and [[QAM]]; firmware required
 +
|-
 +
| [[Philips Semiconductors|Philips]] || [[NXP TDA1002x|TDA10021]] || [[DVB-C]] ||  {{Yes}} || Supports [[QAM]]
 +
|-
 +
| [[Philips Semiconductors|Philips]] || [[NXP TDA1004x|TDA10045]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
 +
|-
 +
| [[Philips Semiconductors|Philips]] || [[NXP TDA1004x|TDA10046]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
 +
|-
 +
| [[Philips Semiconductors|Philips]] || [[NXP TDA1004x|TDA10048]] || [[DVB-T]] ||  {{Yes}} || Supports [[COFDM]]
 +
|-
 +
| [[Philips Semiconductors|Philips]] || [[Philips TDA8083|TDA8083]] || [[DVB-S]] ||  {{Yes}} || supports  [[QPSK]]
 +
|-
 +
| [[Samsung]] || [[Samsung s5h1409|s5h1409]] || [[ATSC]] ||  {{Yes}} || Supports [[8-VSB]], [[QAM]].  Also known as the Conexant CX24227
 +
|-
 +
| [[Samsung]] || [[Samsung s5h1411|s5h1411]] || [[ATSC]] ||  {{Yes}} || Supports [[8-VSB]], [[QAM]]. 
 +
|-
 +
| [[SPaSE]] || [[SPaSE SP8870|SP8870]] || [[DVB-T]] || {{Unknown}} || supports [[COFDM]]
 +
|-
 +
| [[SPaSE]] || [[SPaSE SP8872|SP8872]] || [[DVB-T]] || {{Unknown}} || [[COFDM]]
 +
|-
 +
| [[STMicroelectronics]] || [[STMicroelectronics STV0297|STV0297]] || [[DVB-C]] ||  {{Yes}} || supports [[QAM]]
 +
|-
 +
| [[STMicroelectronics]] || [[STMicroelectronics STV0299|STV0299]] || [[DVB-S]] ||  {{Yes}} || supports  [[QPSK]]
 +
|-
 +
| [[STMicroelectronics]] || [[STMicroelectronics STB0899|STB0899]] || [[DVB-S2]] ||  {{Yes}} || supports [[8PSK]], [[QPSK]], [[16APSK]]
 +
|-
 +
| [[STMicroelectronics]] || [[STMicroelectronics STV0900|STV0900/3]] || [[DVB-S2]] || {{Unknown}} ||supports [[QPSK]]
 +
|-
 +
| [[STMicroelectronics]] || [[STMicroelectronics STV0900|STV0900]] || [[DVB-S2]] || {{Unknown}} ||
 +
|-
 +
| [[STMicroelectronics]] || [[STMicroelectronics STV0900|STV0900B]] || [[DVB-S2]] || {{Unknown}} ||
 +
|-
 +
| [[VLSI Technology]] || [[VLSI VES1893|VES1893]] || [[DVB-S]] ||  {{Yes}} || supports [[QPSK]]
 +
|-
 +
| [[VLSI Technology]] || [[VLSI VES1993|VES1993]] || [[DVB-S]] ||  {{Yes}} || supports [[QPSK]]
 +
|-
 +
| [[VLSI Technology]] || [[VLSI VES1820|VES1820]] || [[DVB-C]] ||  {{Yes}} || supports [[QAM]]
 +
|-
 +
| [[Zarlink Semiconductor]] || [[Zarlink MT312|MT312]] || [[DVB-S]]/[[DSS]] ||  {{Yes}} || supports [[QPSK]]
 +
|-
 +
| [[Zarlink Semiconductor]] || [[Zarlink MT352|MT352]] || [[DVB-T]] ||  {{Yes}} || supports [[COFDM]]
 +
|-
 +
| [[Zarlink Semiconductor]] || [[Zarlink ZL10312|ZL10312]] || [[DVB-S]]/[[DSS]] || {{no}} || supports [[QPSK]]
 +
|-
 +
| [[Zarlink Semiconductor]] || [[Zarlink ZL10313|ZL10313]] || [[DVB-S]]/[[DSS]] || {{no}} || supports [[QPSK]]
 +
|-
 +
| [[Zoran]] || [[Zoran Cascade2|Cascade2 (CAS-220)]] || [[ATSC]] || {{Unknown}} || Supports [[8-VSB]], [[QAM]]. Formerly [[Oren]]
|}
|}
 +
...and so on ...
 +
 +
==Also see==
 +
* [[List of Chipset Vendors]]
[[Category:Technology]]
[[Category:Technology]]
 +
[[Category:Hardware]]
 +
[[Category:Demodulator]]

Revision as of 23:25, 26 November 2012

A Demodulator (short Demod) recovers (demodulates) the original information from an intermediate frequency (IF) that is provided to it by a tuner. The type of demodulator IC used for this task of information recovery is specific and dependent upon the nature of the signal transmission scheme involved.

In the case of analog TV, the IF inputted into the demodulator contains the composite signal that was originally modulated onto the RF carrier. After recovery, the demodulator outputs a CVSB signal, which will then need to be digitized through sampling techniques performed by a A/V decoder.

In the case of digital TV transmission schemes, the IF inputted into the demodulator contains a MPEG-2 Transport Stream (TS) that was originally modulated onto the RF carrier. In the process of recovering that TS, digital demodulators will perform Forward Error Correction (Convolutional Viterbi- and Block-Reed-Solomon-Decoding). This whole process is sometimes referred to as RF-to-bits, for, unlike the case with analog IF demodulators, the recovered signal outputted from the digital demodulator is already a digital bit stream; specifically a TS. The TS will in turn be sent to a decoder in order to display (and, depending upon what format the underlying video content contained within the TS was encoded with, this could be a MPEG-2 or MPEG-4 decoder ... and either hardware or software based).

Contents

Demodulator Chipsets

Analogue IF Demodulators

A Sortable List of Analog IF Demodulators
Vendor Model Standards Linux Support Comments
Philips TDA9887 NTSC Yes -
Xceive XC3028 NTSC, PAL er, somewhat firmware galore
Xceive XC5000 NTSC, PAL er, somewhat firmware galore

... and so on ...

Digital Demodulators

A Sortable List of Digital Demodulators
Vendor Model Standard Linux Support Comments
Afatech AF9005 DVB-T Yes Supports COFDM. A combo USB bridge & demod IC
Afatech AF9015 DVB-T Yes Supports COFDM. A combo USB bridge & demod IC
Afatech AF9035 DVB-T Yes  ; firmware required
ATI/AMD Nxt2000 ATSC ? Unknown Supports 8-VSB, QAM; firmware required
ATI/AMD Nxt2002 ATSC Yes Supports 8-VSB, QAM; firmware required
ATI/AMD Nxt2004 ATSC Yes Supports 8-VSB, QAM; firmware required
ATI/AMD NXT6000 DVB-T Yes Supports COFDM
ATI/AMD Theater 31x ATSC No Supports 8-VSB, QAM
Atmel AT76C651 DVB-C ? Unknown supports QAM
Commsonic CMS0014 DVB-S2 ? Unknown QPSK 8PSK, 16APSK and 32APSK
Conexant CX24116 DVB-S2 ? Unknown
Conexant CX22700 DVB-T Yes Supports COFDM
Conexant CX24110 DVB-S Yes supports QPSK
DiBcom DIB3000M DVB-T Yes supports COFDM
DiBcom DIB3000P DVB-T Yes supports ?
DiBcom DiB7xxx DVB-T Yes supports ?
E3C EC168 DVB-T exp
Eccincorp ECC3100 (SkyPHY) DVB-S2 ? Unknown
Fujitsu MB86A16 DVB-S @mantis source (?) supports QPSK
Intel there are several intel demods that could be added here
LG DT3302 ATSC Yes Supports 8-VSB, QAM
LG DT3303 ATSC Yes Supports 8-VSB, QAM
LSI Logic Corporation L64781 DVB-T Yes Supports COFDM
LSI Logic Corporation L64782 DVB-T Yes Supports COFDM
Microtune MT8872 DVB-T ? Unknown COFDM
Montage M88DS3000 DVB-S2 Yes QPSK 8PSK, 16APSK and 32APSK
Montage M88DS3002 DVB-S2 Yes QPSK 8PSK, 16APSK and 32APSK
Oren or51211 ATSC Yes supports 8-VSB and QAM; firmware required, however, no QAM capable firmware is known
Oren or51132 ATSC Yes supports 8-VSB and QAM; firmware required
Philips TDA10021 DVB-C Yes Supports QAM
Philips TDA10045 DVB-T Yes Supports COFDM
Philips TDA10046 DVB-T Yes Supports COFDM
Philips TDA10048 DVB-T Yes Supports COFDM
Philips TDA8083 DVB-S Yes supports QPSK
Samsung s5h1409 ATSC Yes Supports 8-VSB, QAM. Also known as the Conexant CX24227
Samsung s5h1411 ATSC Yes Supports 8-VSB, QAM.
SPaSE SP8870 DVB-T ? Unknown supports COFDM
SPaSE SP8872 DVB-T ? Unknown COFDM
STMicroelectronics STV0297 DVB-C Yes supports QAM
STMicroelectronics STV0299 DVB-S Yes supports QPSK
STMicroelectronics STB0899 DVB-S2 Yes supports 8PSK, QPSK, 16APSK
STMicroelectronics STV0900/3 DVB-S2 ? Unknown supports QPSK
STMicroelectronics STV0900 DVB-S2 ? Unknown
STMicroelectronics STV0900B DVB-S2 ? Unknown
VLSI Technology VES1893 DVB-S Yes supports QPSK
VLSI Technology VES1993 DVB-S Yes supports QPSK
VLSI Technology VES1820 DVB-C Yes supports QAM
Zarlink Semiconductor MT312 DVB-S/DSS Yes supports QPSK
Zarlink Semiconductor MT352 DVB-T Yes supports COFDM
Zarlink Semiconductor ZL10312 DVB-S/DSS No supports QPSK
Zarlink Semiconductor ZL10313 DVB-S/DSS No supports QPSK
Zoran Cascade2 (CAS-220) ATSC ? Unknown Supports 8-VSB, QAM. Formerly Oren

...and so on ...

Also see

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