BR9610614A - Aparelho e processo para demodular um sinal compósito - Google Patents
Aparelho e processo para demodular um sinal compósitoInfo
- Publication number
- BR9610614A BR9610614A BR9610614-0A BR9610614A BR9610614A BR 9610614 A BR9610614 A BR 9610614A BR 9610614 A BR9610614 A BR 9610614A BR 9610614 A BR9610614 A BR 9610614A
- Authority
- BR
- Brazil
- Prior art keywords
- signals
- digital
- complementary
- demodulating
- signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/2245—Homodyne or synchrodyne circuits using two quadrature channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/18—Aspects of broadcast communication characterised by the type of broadcast system in band on channel [IBOC]
- H04H2201/186—AM digital or hybrid
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
- H04L27/26522—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators using partial FFTs
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
"APARELHO E PROCESSO PARA DEMODULAR UM SINAL COMPóSITO"A invenção apresenta um processo e aparelho para demodualr uma forma de onda DAB AM composta que contem portadoras digitalmente moduladas e que emprega um misturador (180) para converter um sinal recebido (170) em dois sinais, o primeiro destes sinais representa um componente em-fase e o segundo dos sinais representa um componente em quadratura, dosi conversores analógicos/digitais (182, 184) para converter os dois sinais digitais, e dois elementos de transformação rápida de Fourier (188, 190) para extrair dados separadamente dos dois sinais digitais. Sinais de portadoras digitais complementares são recuperados da quadratura, e portadores digitais não complementares são derivados de uma soma dos lados complementares e da saída do processo FFT de componente em-fase. O escape do sinal AM através de um filtro passa-alto (186) é impedido de interferir com a demodulação do sinal de portadora complementar pelo uso de canais de demodulação separados.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US301895P | 1995-08-31 | 1995-08-31 | |
US08/604,276 US5633896A (en) | 1996-02-21 | 1996-02-21 | AM compatible digital waveform demodulation using a dual FFT |
PCT/US1996/013526 WO1997008877A1 (en) | 1995-08-31 | 1996-08-21 | Am compatible digital waveform demodulation using a dual fft |
Publications (1)
Publication Number | Publication Date |
---|---|
BR9610614A true BR9610614A (pt) | 1999-12-21 |
Family
ID=26671176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR9610614-0A BR9610614A (pt) | 1995-08-31 | 1996-08-21 | Aparelho e processo para demodular um sinal compósito |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0847642A4 (pt) |
JP (1) | JPH11509066A (pt) |
AU (1) | AU6853996A (pt) |
BR (1) | BR9610614A (pt) |
CA (1) | CA2233063A1 (pt) |
WO (1) | WO1997008877A1 (pt) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6295317B1 (en) * | 1998-10-02 | 2001-09-25 | Usa Digital Radio Partners, Lp | Method and apparatus for demodulating and equalizing an AM compatible digital audio broadcast signal |
US6556639B1 (en) * | 1999-06-24 | 2003-04-29 | Ibiquity Digital Corporation | Method and apparatus for determining transmission mode and synchronization for a digital audio broadcasting signal |
GB0020624D0 (en) | 2000-08-21 | 2000-10-11 | Element 14 Inc | Multi band DMT receiver |
ES2181550B1 (es) * | 2000-09-06 | 2003-12-16 | Univ Valencia Politecnica | Selector de portadoras en modulaciones ofdm (multiplexacion por division de frencuencia ortogonal). |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5128964A (en) * | 1990-10-10 | 1992-07-07 | Intelligent Modem Corporation | Modulation method and apparatus for multicarrier data transmission |
SG44771A1 (en) * | 1991-02-28 | 1997-12-19 | Philips Electronics Nv | System for broadcasting and receiving digital data receiver and transmitter for use in such system |
US5278826A (en) * | 1991-04-11 | 1994-01-11 | Usa Digital Radio | Method and apparatus for digital audio broadcasting and reception |
DE4111855C2 (de) * | 1991-04-11 | 1994-10-20 | Inst Rundfunktechnik Gmbh | Verfahren zum rundfunkmäßigen Übertragen eines digital codierten Datenstroms |
FR2707064B1 (pt) * | 1993-06-21 | 1996-03-08 | France Telecom |
-
1996
- 1996-08-21 EP EP96928969A patent/EP0847642A4/en not_active Withdrawn
- 1996-08-21 AU AU68539/96A patent/AU6853996A/en not_active Abandoned
- 1996-08-21 CA CA002233063A patent/CA2233063A1/en not_active Abandoned
- 1996-08-21 JP JP9510405A patent/JPH11509066A/ja active Pending
- 1996-08-21 BR BR9610614-0A patent/BR9610614A/pt not_active Application Discontinuation
- 1996-08-21 WO PCT/US1996/013526 patent/WO1997008877A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
JPH11509066A (ja) | 1999-08-03 |
CA2233063A1 (en) | 1997-03-06 |
EP0847642A1 (en) | 1998-06-17 |
WO1997008877A1 (en) | 1997-03-06 |
EP0847642A4 (en) | 2001-09-12 |
AU6853996A (en) | 1997-03-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FA10 | Dismissal: dismissal - article 33 of industrial property law |