BR9914260A - Processo e aparelho para demodular e equalizar um sinal de rádio difusão digital compatìvel com amplitude modulada, e, processo de operar um receptor de rádio frequência e receptor de rádio frequência para receber um sinal de rádio difusão digital compatìvel com amplitude modulada - Google Patents

Processo e aparelho para demodular e equalizar um sinal de rádio difusão digital compatìvel com amplitude modulada, e, processo de operar um receptor de rádio frequência e receptor de rádio frequência para receber um sinal de rádio difusão digital compatìvel com amplitude modulada

Info

Publication number
BR9914260A
BR9914260A BR9914260-0A BR9914260A BR9914260A BR 9914260 A BR9914260 A BR 9914260A BR 9914260 A BR9914260 A BR 9914260A BR 9914260 A BR9914260 A BR 9914260A
Authority
BR
Brazil
Prior art keywords
signal
radio frequency
frequency receiver
modulated amplitude
carrier signals
Prior art date
Application number
BR9914260-0A
Other languages
English (en)
Inventor
David Carl Hartup
Don R Goldston
Original Assignee
Ibiquity Digital Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ibiquity Digital Corp filed Critical Ibiquity Digital Corp
Publication of BR9914260A publication Critical patent/BR9914260A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/01—Equalisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
    • H04L2025/03439—Fixed structures
    • H04L2025/03522—Frequency domain

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

''PROCESSO E APARELHO PARA DEMODULAR E EQUALIZAR UM SINAL DE RáDIO DIFUSãO DIGITAL COMPATìVEL COM AMPLITUDE MODULADA, E, PROCESSO DE OPERAR UM RECEPTOR DE RáDIO FREQuêNCIA E RECEPTOR DE RáDIO FREQuêNCIA PARA RECEBER UM SINAL DE RáDIO DIFUSãO DIGITAL COMPATìVEL COM AMPLITUDE MODULADA'' Um processo de demodulação e equalização é usado para processar um sinal de rádio difusão digital compatível com amplitude modulada, incluindo um sinal de rádio freq³ência modulado em amplitude possuindo uma primeira portadora modulada por um sinal de programa analógico em um primeiro espectro de freq³ência, diversos sinais de portadora modulados digitalmente posicionados dentro de uma largura de banda que abrange o primeiro espectro de freq³ência, um primeiro grupo dos sinais de portadora modulados digitalmente incluindo sinais de portadora complementares e permanecendo dentro do primeiro espectro de freq³ência, e segundo e terceiro grupos dos sinais de portadora modulados digitalmente incluindo sinais de portadora não complementares e permanecendo fora do primeiro espectro de freq³ência. O processo inclui as etapas de: considerar uma primeira transformada de Fourier do sinal digital composto modulado em amplitude para produzir um primeiro sinal transformado representativo das portadoras não complementares; processar o primeiro sinal transformado para produzir um primeiro sinal equalizado, multiplicando o primeiro sinal transformado por um primeiro vetor de equalização no qual o vetor de equalização inclui primeiros diversos coeficientes de equalizador; atualizar os primeiros diversos coeficientes de equalizador; considerar uma Transformada de Fourier Rápida do sinal digital compatível modulado em amplitude, para produzir um segundo sinal transformado representativo das portadoras complementares; determinar um segundo vetor de equalização compreendendo segundos diversos coeficientes de equalizador, nos quais segundos diversos coeficientes de equalizador são determinados interpolando coeficientes dos primeiros diversos coeficientes de equalizador; processar o segundo sinal transformado para produzir um segundo sinal equalizado, multiplicando segundo sinal transformado pelo vetor de equalização. A invenção também abrange a operação de receptores de rádio freq³ência que utilizam o processo acima, bem como aparelho que realiza o método acima e receptores de rádio freq³ência que utilizam o método de equalização acima.
BR9914260-0A 1998-10-02 1999-09-02 Processo e aparelho para demodular e equalizar um sinal de rádio difusão digital compatìvel com amplitude modulada, e, processo de operar um receptor de rádio frequência e receptor de rádio frequência para receber um sinal de rádio difusão digital compatìvel com amplitude modulada BR9914260A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/208,107 US6295317B1 (en) 1998-10-02 1998-10-02 Method and apparatus for demodulating and equalizing an AM compatible digital audio broadcast signal
PCT/US1999/020276 WO2000021261A1 (en) 1998-10-02 1999-09-02 Method and apparatus for demodulating and equalizing an am compatible digital audio broadcast signal

Publications (1)

Publication Number Publication Date
BR9914260A true BR9914260A (pt) 2001-07-03

Family

ID=22773203

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9914260-0A BR9914260A (pt) 1998-10-02 1999-09-02 Processo e aparelho para demodular e equalizar um sinal de rádio difusão digital compatìvel com amplitude modulada, e, processo de operar um receptor de rádio frequência e receptor de rádio frequência para receber um sinal de rádio difusão digital compatìvel com amplitude modulada

Country Status (13)

Country Link
US (2) US6295317B1 (pt)
EP (1) EP1118195B1 (pt)
JP (1) JP2002527949A (pt)
KR (1) KR20010079967A (pt)
CN (1) CN1151643C (pt)
AT (1) ATE267491T1 (pt)
AU (1) AU753955B2 (pt)
BR (1) BR9914260A (pt)
CA (1) CA2345999C (pt)
DE (1) DE69917471D1 (pt)
MX (1) MXPA01003333A (pt)
RU (1) RU2222872C2 (pt)
WO (1) WO2000021261A1 (pt)

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US6731682B1 (en) * 2000-04-07 2004-05-04 Zenith Electronics Corporation Multipath ghost eliminating equalizer with optimum noise enhancement
JP2001313594A (ja) * 2000-04-28 2001-11-09 Fujitsu Ltd Ｄｍｔシステムのタイムドメインイコライザーの係数更新方法、レシーブ方法、ｄｍｔシステム及びｄｍｔモデム
US6671340B1 (en) * 2000-06-15 2003-12-30 Ibiquity Digital Corporation Method and apparatus for reduction of interference in FM in-band on-channel digital audio broadcasting receivers
US6898249B2 (en) * 2002-12-17 2005-05-24 Ibiquity Digital Corporation Method and apparatus for AM digital audio broadcasting with amplitude scaled tertiary subcarriers
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US7697620B2 (en) * 2005-11-14 2010-04-13 Ibiquity Digital Corporation Equalizer for AM in-band on-channel radio receivers
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US9191256B2 (en) 2012-12-03 2015-11-17 Digital PowerRadio, LLC Systems and methods for advanced iterative decoding and channel estimation of concatenated coding systems
US8595590B1 (en) 2012-12-03 2013-11-26 Digital PowerRadio, LLC Systems and methods for encoding and decoding of check-irregular non-systematic IRA codes
US8948272B2 (en) 2012-12-03 2015-02-03 Digital PowerRadio, LLC Joint source-channel decoding with source sequence augmentation
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CN113472372B (zh) * 2016-12-22 2023-02-17 新唐科技日本株式会社 噪声抑制装置、噪声抑制方法、以及接收装置、接收方法

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Also Published As

Publication number Publication date
EP1118195A1 (en) 2001-07-25
WO2000021261A1 (en) 2000-04-13
EP1118195B1 (en) 2004-05-19
CN1326633A (zh) 2001-12-12
CN1151643C (zh) 2004-05-26
US20020097796A1 (en) 2002-07-25
AU753955B2 (en) 2002-10-31
KR20010079967A (ko) 2001-08-22
CA2345999A1 (en) 2000-04-13
US6480536B2 (en) 2002-11-12
JP2002527949A (ja) 2002-08-27
DE69917471D1 (de) 2004-06-24
ATE267491T1 (de) 2004-06-15
MXPA01003333A (es) 2004-02-17
RU2222872C2 (ru) 2004-01-27
AU6135899A (en) 2000-04-26
US6295317B1 (en) 2001-09-25
CA2345999C (en) 2005-03-22

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Legal Events

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B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 7A, 8A E 9A ANUIDADES.

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO PUBLICADO NA RPI 1962 DE 12/08/2008.

B15K Others concerning applications: alteration of classification

Ipc: H04L 25/03 (2006.01)