Demodulator: Difference between revisions

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(STB0899 also supports 16APSK)
(intermediate save)
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! Vendor !! Model !! Standards !! Linux Support !! class="unsortable"| Comments
! Vendor !! Model !! Standards !! Linux Support !! class="unsortable"| Comments
|-
|-
| [[Philips]] || TDA9887 || NTSC || Yes || -
| [[Philips Semiconductors|Philips]] || TDA9887 || NTSC || Yes || -
|-
|-
| [[Xceiev]] || [[Xceive XC3028|XC3028]] || NTSC, PAL || er, somewhat || firmware galore
| [[Xceive]] || [[Xceive XC3028|XC3028]] || NTSC, PAL || er, somewhat || firmware galore
⚫
|-
| [[Xceive]] || [[Xceive XC5000|XC5000]] || NTSC, PAL || er, somewhat || firmware galore
|}
|}
... an so on ...
... and so on ...


===Digital Demodulators===
===Digital Demodulators===
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|-
|-
| [[ATI/AMD]] || [[ATI/AMD Nxt2004|Nxt2004]] || [[ATSC]] || yes || Supports 8-VSB, QAM; firmware required
| [[ATI/AMD]] || [[ATI/AMD Nxt2004|Nxt2004]] || [[ATSC]] || yes || Supports 8-VSB, QAM; firmware required
⚫
|-
| [[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
| [[ATI/AMD]] || [[ATI/AMD Theater 31x|Theater 31x]] || [[ATSC]] || no || Supports 8-VSB, QAM
⚫
|-

| [[Conexant]] || [[Conexant CX24116|CX24116]] || [[DVB-S2]] || ? ||

⚫
|-

| [[Conexant]] || [[Conexant CX22700|CX22700]] || [[DVB-T]] || yes || Supports [[COFDM]]
⚫
|-
| [[Conexant]] || [[Conexant CX24110|CX24110]] || [[DVB-S]] || yes || supports [[QPSK]]
|-
| [[LSI Logic Corporation]] || [[LSI L64781|L64781]] || [[DVB-T]] || yes || Supports [[COFDM]]
|-
| [[LSI Logic Corporation]] || [[LSI L64782|L64782]] || [[DVB-T]] || yes || Supports [[COFDM]]
|-
|-
| [[Philips Semiconductors|Philips]] || [[Philips TDA10021|TDA10021]] || [[DVB-C]] || yes || Supports [[QAM]]
| [[Philips Semiconductors|Philips]] || [[Philips TDA10021|TDA10021]] || [[DVB-C]] || yes || Supports [[QAM]]
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===DVB-S2 Demodulators===
===DVB-S2 Demodulators===
* [[Commsonic CMS0014]]
* [[Commsonic CMS0014]]
* [[Conexant CX24116]]
* [[Eccincorp ECC3100 (SkyPHY)]]
* [[Eccincorp ECC3100 (SkyPHY)]]


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! style="background:#ffdead;" | Model
! style="background:#ffdead;" | Model
! style="background:#ffdead;" | Type and Vendor
! style="background:#ffdead;" | Type and Vendor
⚫
|-
! style="background:#efefef;" | [[NXT6000]]
! [[DVB-T]]/[[COFDM]] Demod produced by [[ATI/AMD|ATI]]
|-
|-
! style="background:#efefef;" | [[Atmel AT76C651|AT76C651]]
! style="background:#efefef;" | [[Atmel AT76C651|AT76C651]]
! [[DVB-C]]/[[QAM]] Demod produced by [[Atmel Corporation]]
! [[DVB-C]]/[[QAM]] Demod produced by [[Atmel Corporation]]
⚫
|-
! style="background:#efefef;" | [[Conexant CX22700|CX22700]]
! [[DVB-T]]/[[COFDM]] Demod produced by [[Conexant Systems, Inc.]]
⚫
|-
! style="background:#efefef;" | [[Conexant CX24110|CX24110]]
! [[DVB-S]]/[[QPSK]] Demod produced by [[Conexant Systems, Inc.]]
|-
|-
! style="background:#efefef;" | [[DIB3000M]]
! style="background:#efefef;" | [[DIB3000M]]
! [[DVB-T]]/[[COFDM]] Demod produced by [[DiBcom]]
! [[DVB-T]]/[[COFDM]] Demod produced by [[DiBcom]]
⚫
|-
! style="background:#efefef;" | [[LSI L64781|L64781]]
! [[DVB-T]]/[[COFDM]] Demod produced by [[LSI Logic Corporation]]
⚫
|-
! style="background:#efefef;" | [[LSI L64782|L64782]]
! [[DVB-T]]/[[COFDM]] Demod produced by [[LSI Logic Corporation]]
|-
|-
! style="background:#efefef;" | [[Microtune MT8872|MT8872]]/[[SPaSE SP8872|SP8872]]
! style="background:#efefef;" | [[Microtune MT8872|MT8872]]/[[SPaSE SP8872|SP8872]]

Revision as of 03:35, 24 December 2007

A Demodulator (short Demod) recovers (demodulates) the original information from the received and downconverted RF signal -- a tuner acquires the RF signal and converts it to an intermediate frequency (IF) which is then passed onto the demodulator for processing. 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 MPEG2 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 MPEG2 or MPEG4 decoder ... and either hardware or software based).

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
ATI/AMD Nxt2000 ATSC ? 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
Conexant CX24116 DVB-S2 ?
Conexant CX22700 DVB-T yes Supports COFDM
Conexant CX24110 DVB-S yes supports QPSK
LSI Logic Corporation L64781 DVB-T yes Supports COFDM
LSI Logic Corporation L64782 DVB-T yes Supports COFDM
Philips TDA10021 DVB-C yes Supports QAM
Philips TDA10045 DVB-T yes Supports COFDM
Philips TDA10046 DVB-T yes Supports COFDM
Philips TDA8083 DVB-S yes supports QPSK
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 ? supports QPSK
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

...and so on ...

Note: Info below needs to be added to table above

ATSC Demodulators

  • LG DT3302
  • LG DT3303
  • Oren
  • Oren
  • Samsung s5h
  • Zoran/Oren Cascade

....

DVB-T Demodulators

...

DVB-S2 Demodulators

...


Some Examples for Digital Demods are
Model Type and Vendor
AT76C651 DVB-C/QAM Demod produced by Atmel Corporation
DIB3000M DVB-T/COFDM Demod produced by DiBcom
MT8872/SP8872 DVB-T/COFDM Demod produced by Microtune/SPaSE
SP8870 DVB-T/COFDM Demod produced by SPaSE


Also see

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