EP0941588B1 - Procede et dispositif de radiodiffusion mixte analogique et numerique d'emission radiophonique diffusee par un meme emetteur - Google Patents
Procede et dispositif de radiodiffusion mixte analogique et numerique d'emission radiophonique diffusee par un meme emetteur Download PDFInfo
- Publication number
- EP0941588B1 EP0941588B1 EP97947119A EP97947119A EP0941588B1 EP 0941588 B1 EP0941588 B1 EP 0941588B1 EP 97947119 A EP97947119 A EP 97947119A EP 97947119 A EP97947119 A EP 97947119A EP 0941588 B1 EP0941588 B1 EP 0941588B1
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- European Patent Office
- Prior art keywords
- modulation
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001228 spectrum Methods 0.000 claims abstract description 32
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
Definitions
- the present invention relates to a broadcasting method mixed analog and digital to ensure the transition between conventional amplitude modulation broadcasting systems, for example example, and digital broadcasting systems. It applies in particular the creation of a transmitter broadcasting in the range of short waves.
- the object of the invention is to remedy this situation.
- the invention relates to a broadcasting method mixed analog and digital broadcast radio broadcast by the same transmitter and intended to be received equally by amplitude modulation or single sideband receivers and digital type receivers suitable for multi demodulation subcarriers, characterized in that it consists in transmitting a signal composite whose frequency spectrum consists of a first analog spectrum representative of amplitude modulation or single sideband and a second spectrum composed of multi-subcarriers, the first and second spectrum occupying two bands of disjoint frequency.
- the invention has the advantage that it allows broadcasting simultaneous analog and digital by the same transmitter of a transmission can be received by a modulation receiver as well scope of trade without the need to modify or change it, only by a receiver fitted with a signal demodulator digital.
- the transmission signal is produced according to the invention by modulation of a composite signal which is the sum of the audio signal and a digital signal obtained by multi-sub-modulation of the audio signal.
- the frequency spectrum of the digital signal is formed as represented by curve A of FIG. 1 by a large number of regularly spaced subcarriers and modulated independently of each other according to a modulation method with several phase states of the type known for example under the abbreviation MAQ of Amplitude Modulation on two quadrature channels.
- the frequency spectrum obtained occupies a bandwidth B n which is the sum of the frequency spectra of all the subcarriers.
- the frequency spectrum of the digital signal as a whole appears very well delimited in the frequency space, unlike the spectrum represented by the curve B in Figure 1 which is that obtained with a digital modulation method on a single carrier.
- the analog signal is transmitted using the known methods of amplitude modulation with two sidebands or with a single sideband known by the abbreviation BLU.
- amplitude modulation still known by the English abbreviation AM for "Amplitude-Modulation”
- the analog signal is obtained by amplitude modulation of a pure carrier, taking care that the amplitude of the modulated signal is never canceled.
- a signal to be modulated S (t) gives rise at the output of a transmitter to a signal of the form cos (2 ⁇ F o t) (S o + S (t) ) where S o is a bias guaranteeing a positive amplitude and F o is the carrier frequency.
- the frequency spectrum is formed as shown in FIG.
- the power conveyed by the carrier residue represents 70% of the total power emitted, while the carrier residue does not carry any information by itself, the useful information being entirely contained in each of the spectra S (f ) .
- the spectral congestion obtained is as shown in Figure 3 reduced A half. Modulation which can be seen as modulation amplitude is filtered to let pass only one of the two halves frequency spectrum with little or no carrier residue.
- the reduction in transmission power varies depending on the fraction carrier residue. If this residue is completely eliminated, the necessary transmitting power, at equivalent range, is no longer than 15% of that required for AM amplitude modulation.
- Unfortunately as a simple commercial receiver appears unable to properly demodulate such a signal especially when the carrier residue is absent, the transmission must take place with a residue therefore of carrier, to limit the distortion which invariably can occur with an amplitude modulation receiver.
- the composite signal which is transmitted according to the invention by a single transmitter is the sum of the analog signal, of bandwidth B a and of the digital signal of bandwidth B n .
- the bandwidth of the signal S (t) is designated by B S and is close to the bandwidth B o .
- B n denotes the bandwidth necessary for the transmission of the bit rate of the digital signal associated with S (t).
- the high frequencies of the spectrum S (f) are arranged to be the closest to those of the digital signal.
- a possible involuntary reception by a commercial AM receiver of some of the frequencies contained in the digital signal can only result in a noise localized in the high frequencies, which is a lesser harm by the fact that a noise in the acute frequencies is perceptually less annoying than in the low frequencies and that in addition a receiver with amplitude modulation of the trade strongly attenuates the treble.
- the power conveyed by the digital component can be equal or even lower than that of the analog component, which amounts to saying that the total power transmitted can be close to or less than that which is necessary for a transmitter with AM amplitude modulation carrying only the analog signal.
- the difference between the frequencies F 0 and F 1 which respectively represent the frequency of the carrier residue for the analog and the central frequency of the digital is determined so that the total band of the transmitted signal, denoted B t , is compatible with the broadcasting rules in use.
- the transmission in AM amplitude modulation of the digital signal alone can occupy all the available band on its own or, as shown in the figure 6, the simultaneous transmission in amplitude modulation of analog and digital, the digital signal can then be considered as a special "signaling" located beyond the acute frequencies of the low frequency analog signal S (t) .
- the emission of the analog signal in AM amplitude modulation or in modulation known by the English abbreviation VSB (Vestigial Side Band) to limit the distortion in the low frequencies and the digital in upper or lower sideband.
- a device for implementing the method previously described is shown in Figure 8.
- This includes a circuit adder 1 coupled by a first input to a first channel of modulation composed of an audio frequency coder 2, a multiplexer 3 of data supplied by the encoder 2, and of service data and auxiliaries, and a multi-sub modulator 4 linked together in this serial order.
- the summator 1 is also coupled by a second modulation input to a second compound channel essentially by a low pass filter 5.
- the output of the summing circuit 1 is coupled to the input of a modulation device 6 composed by a modulator with AM amplitude modulation or with a single BLU sideband.
- the modulated signal supplied by the modulation device 6 is filtered by a side band selector filter 7.
- a control device 8 is coupled between the output of the low pass filter 5 to regulate the level of residual carrier provided by the modulation device 6 This is made up as shown in figure 9 of two ways.
- a first channel comprises a device for estimating the minima of the signal S (t) coupled to a first input of a subtractor circuit 10 via a low pass filter 11.
- a second channel is composed of a circuit with delay 12 of a determined duration T corresponding to the duration of the processing of the signal S (t) in the first channel, coupled to a second input of the subtractor circuit 10 via a multiplier circuit 13 by a set value 9 .
- the output of the subtractor circuit 10 is connected to a control input of the modulation device 6 of FIG. 8.
- the signal S (t) is applied according to this configuration simultaneously to the respective inputs of the device for estimating minima 9 and of the device delay 12.
- the regulating device 8 makes it possible to limit the waste of energy represented by a strong carrier residue, by continuously adjusting this residue as a function of the instantaneous power of the signal S (t) .
- the distortion is perfectly negligible.
- the other values of the signal S (t) the distortion is brought to an acceptable level.
- the minima of the signal S (t) are permanently estimated and filtered by the low-pass filter 11 whose cut-off frequency is for example 10 Hz so as to be inaudible and the value obtained is delayed by the delay T and is affected by a gain g less than 1 before being subtracted from the signal S (t) .
- the frequency spectrum of the resulting analog signal transmitted at the output of the selector filter 7 then has the form shown in FIG. 10, the carrier residue being modulated with a very small bandwidth.
- FIGS. 11 a , 11 b and 11 c Temporal waveforms of the carrier without and with modulation of the residue are shown in FIGS. 11 a , 11 b and 11 c as a function of the amplitude of the signal S (t).
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
Claims (10)
- Procédé de radiodiffusion mixte en analogique et en numérique d'émission radiophonique diffusée par un même émetteur et destinée à être reçue indifféremment par des récepteurs à modulation d'amplitude ou à bande latérale unique et des récepteurs de type numérique adaptés pour la démodulation de multi sous-porteuses, caractérisé en ce qu'il consiste à émettre un signal composite dont le spectre de fréquence (Bt) se compose d'un premier spectre analogique (Ba) représentatif de la modulation d'amplitude ou de la bande latérale unique et d'un deuxième spectre (Bn) composé des multi sous-porteuses, les premier et deuxième spectres occupant deux bandes de fréquence disjointes.
- Procédé selon la revendication 1, caractérisé en ce que le spectre du signal analogique (Ba) est celui d'un signal modulé en amplitude.
- Procédé selon la revendication 1, caractérisé en ce que le spectre (Ba) du signal analogique est celui d'un signal modulé en bande latérale unique.
- Procédé selon la revendication 1, caractérisé en ce que le spectre (Ba) du signal analogique est celui d'un signal modulé VSB.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le spectre (Bn) du signal numérique est composé d'un nombre déterminé de sous porteuses régulièrement espacées et modulées indépendamment les unes des autres selon un procédé de modulation à plusieurs états de phase.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il consiste à disposer le spectre du signal numérique dans une bande de fréquence (Bn) du côté des fréquences correspondant aux fréquences aiguës de la bande de fréquence analogique originale.
- Procédé selon la revendication 6, caractérisé en ce qu'il consiste à émettre simultanément les signaux analogique et numérique en modulation d'amplitude.
- Procédé selon la revendication 6, caractérisé en ce qu'il consiste à émettre simultanément le signal analogique en modulation d'amplitude et le signal numérique en bande latérale unique.
- Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'il comprend un circuit sommateur (1) couplé par une première entrée à une première voie de modulation composée d'un codeur audiofréquence (2), d'un multiplexeur (3) et d'un modulateur mufti sous-porteuses (4) reliés dans cet ordre en série, et couplé par une deuxième entrée à une deuxième voie comportant un filtre basse fréquence (5), la sortie du circuit sommateur (1) étant couplée à l'entrée d'un dispositif de modulation (6) composé par un modulateur à modulation d'amplitude ou à bande latérale unique.
- Dispositif selon la revendication 9, caractérisé en ce qu'il comprend un dispositif de régulation (8) couplé entre la sortie du filtre passe bas (5) et la sortie du modulateur multi sous porteuses (4) pour réguler le niveau de porteuse résiduelle fourni par le dispositif de modulation (6).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9614686 | 1996-11-29 | ||
FR9614686A FR2756686B1 (fr) | 1996-11-29 | 1996-11-29 | Procede et dispositif de radiodiffusion mixte analogique et numerique d'emission radiophonique diffusee par un meme emetteur |
PCT/FR1997/002109 WO1998024201A1 (fr) | 1996-11-29 | 1997-11-21 | Procede et dispositif de radiodiffusion mixte analogique et numerique d'emission radiophonique diffusee par un meme emetteur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0941588A1 EP0941588A1 (fr) | 1999-09-15 |
EP0941588B1 true EP0941588B1 (fr) | 2003-02-05 |
Family
ID=9498189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97947119A Expired - Lifetime EP0941588B1 (fr) | 1996-11-29 | 1997-11-21 | Procede et dispositif de radiodiffusion mixte analogique et numerique d'emission radiophonique diffusee par un meme emetteur |
Country Status (7)
Country | Link |
---|---|
US (1) | US6418300B1 (fr) |
EP (1) | EP0941588B1 (fr) |
JP (1) | JP4131483B2 (fr) |
AT (1) | ATE232342T1 (fr) |
DE (1) | DE69718930T2 (fr) |
FR (1) | FR2756686B1 (fr) |
WO (1) | WO1998024201A1 (fr) |
Families Citing this family (51)
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US6370371B1 (en) | 1998-10-21 | 2002-04-09 | Parkervision, Inc. | Applications of universal frequency translation |
US7236754B2 (en) | 1999-08-23 | 2007-06-26 | Parkervision, Inc. | Method and system for frequency up-conversion |
US7039372B1 (en) | 1998-10-21 | 2006-05-02 | Parkervision, Inc. | Method and system for frequency up-conversion with modulation embodiments |
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US6542722B1 (en) | 1998-10-21 | 2003-04-01 | Parkervision, Inc. | Method and system for frequency up-conversion with variety of transmitter configurations |
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US6813485B2 (en) | 1998-10-21 | 2004-11-02 | Parkervision, Inc. | Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same |
US6560301B1 (en) | 1998-10-21 | 2003-05-06 | Parkervision, Inc. | Integrated frequency translation and selectivity with a variety of filter embodiments |
US7295826B1 (en) | 1998-10-21 | 2007-11-13 | Parkervision, Inc. | Integrated frequency translation and selectivity with gain control functionality, and applications thereof |
US6049706A (en) | 1998-10-21 | 2000-04-11 | Parkervision, Inc. | Integrated frequency translation and selectivity |
US7006805B1 (en) | 1999-01-22 | 2006-02-28 | Parker Vision, Inc. | Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service |
US6704558B1 (en) | 1999-01-22 | 2004-03-09 | Parkervision, Inc. | Image-reject down-converter and embodiments thereof, such as the family radio service |
US6704549B1 (en) | 1999-03-03 | 2004-03-09 | Parkvision, Inc. | Multi-mode, multi-band communication system |
US6853690B1 (en) | 1999-04-16 | 2005-02-08 | Parkervision, Inc. | Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments |
US6879817B1 (en) | 1999-04-16 | 2005-04-12 | Parkervision, Inc. | DC offset, re-radiation, and I/Q solutions using universal frequency translation technology |
US6873836B1 (en) | 1999-03-03 | 2005-03-29 | Parkervision, Inc. | Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology |
US7110435B1 (en) | 1999-03-15 | 2006-09-19 | Parkervision, Inc. | Spread spectrum applications of universal frequency translation |
US7065162B1 (en) | 1999-04-16 | 2006-06-20 | Parkervision, Inc. | Method and system for down-converting an electromagnetic signal, and transforms for same |
US7693230B2 (en) | 1999-04-16 | 2010-04-06 | Parkervision, Inc. | Apparatus and method of differential IQ frequency up-conversion |
US7110444B1 (en) | 1999-08-04 | 2006-09-19 | Parkervision, Inc. | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations |
US7054296B1 (en) | 1999-08-04 | 2006-05-30 | Parkervision, Inc. | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation |
US8295406B1 (en) | 1999-08-04 | 2012-10-23 | Parkervision, Inc. | Universal platform module for a plurality of communication protocols |
US7072390B1 (en) | 1999-08-04 | 2006-07-04 | Parkervision, Inc. | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments |
US7082171B1 (en) | 1999-11-24 | 2006-07-25 | Parkervision, Inc. | Phase shifting applications of universal frequency translation |
US6963734B2 (en) | 1999-12-22 | 2005-11-08 | Parkervision, Inc. | Differential frequency down-conversion using techniques of universal frequency translation technology |
US7292835B2 (en) | 2000-01-28 | 2007-11-06 | Parkervision, Inc. | Wireless and wired cable modem applications of universal frequency translation technology |
US7010286B2 (en) | 2000-04-14 | 2006-03-07 | Parkervision, Inc. | Apparatus, system, and method for down-converting and up-converting electromagnetic signals |
US7554508B2 (en) | 2000-06-09 | 2009-06-30 | Parker Vision, Inc. | Phased array antenna applications on universal frequency translation |
US7010559B2 (en) | 2000-11-14 | 2006-03-07 | Parkervision, Inc. | Method and apparatus for a parallel correlator and applications thereof |
US7454453B2 (en) | 2000-11-14 | 2008-11-18 | Parkervision, Inc. | Methods, systems, and computer program products for parallel correlation and applications thereof |
US7072427B2 (en) | 2001-11-09 | 2006-07-04 | Parkervision, Inc. | Method and apparatus for reducing DC offsets in a communication system |
US7085335B2 (en) | 2001-11-09 | 2006-08-01 | Parkervision, Inc. | Method and apparatus for reducing DC offsets in a communication system |
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FR2832877B1 (fr) * | 2001-11-23 | 2006-08-18 | Thales Sa | Procede et dispositif d'egalisation par blocs avec interpolation amelioree |
FR2832879B1 (fr) * | 2001-11-23 | 2006-08-18 | Thales Sa | Procede et egalisation par segmentations des donnees |
US6975848B2 (en) | 2002-06-04 | 2005-12-13 | Parkervision, Inc. | Method and apparatus for DC offset removal in a radio frequency communication channel |
US7321640B2 (en) | 2002-06-07 | 2008-01-22 | Parkervision, Inc. | Active polyphase inverter filter for quadrature signal generation |
US7460584B2 (en) | 2002-07-18 | 2008-12-02 | Parkervision, Inc. | Networking methods and systems |
US7379883B2 (en) | 2002-07-18 | 2008-05-27 | Parkervision, Inc. | Networking methods and systems |
FR2847400B1 (fr) * | 2002-11-15 | 2005-01-21 | Thales Sa | Systeme et procede de detection de presence et de synchronisation d'un signal pour un systeme a sauts de frequence fonctionnant en environnement perturbe |
FR2854994B1 (fr) * | 2003-05-16 | 2005-07-01 | Thales Sa | Dispositif et procede de rejection d'interferences auto-adaptatif |
EP2502428B1 (fr) | 2009-11-17 | 2014-06-25 | Phonak AG | Dispositif a assistance auditive et procédé |
DK2502429T3 (en) | 2009-11-17 | 2014-08-04 | Phonak Ag | Hearing assistance system and method |
US20160197669A1 (en) | 2014-12-11 | 2016-07-07 | Tesla Wireless Company LLC | Communication method and system that uses low latency/low data bandwidth and high latency/high data bandwidth pathways |
EP3176954B1 (fr) * | 2015-12-02 | 2018-09-26 | etatronix GmbH | Procede de transmission d'informations numeriques et analogiques lors de la transmission d'energie |
BR112020008038A2 (pt) * | 2017-10-24 | 2020-10-27 | Skywave Networks Llc | sincronização de relógios durante a comutação entre modos de transmissão de difusão e de dados |
CN118400244B (zh) * | 2024-05-24 | 2024-11-22 | 湘潭大学 | 一种数字模拟混合型信号调制方法及调解方法 |
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DE19601161A1 (de) * | 1995-05-27 | 1996-11-28 | Deutsche Telekom Ag | Verfahren zur Übertragung von Zusatzinformationen in TV-Kanälen |
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-
1996
- 1996-11-29 FR FR9614686A patent/FR2756686B1/fr not_active Expired - Fee Related
-
1997
- 1997-11-21 WO PCT/FR1997/002109 patent/WO1998024201A1/fr active IP Right Grant
- 1997-11-21 DE DE69718930T patent/DE69718930T2/de not_active Expired - Lifetime
- 1997-11-21 US US09/308,651 patent/US6418300B1/en not_active Expired - Fee Related
- 1997-11-21 AT AT97947119T patent/ATE232342T1/de active
- 1997-11-21 JP JP52435298A patent/JP4131483B2/ja not_active Expired - Fee Related
- 1997-11-21 EP EP97947119A patent/EP0941588B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1998024201A1 (fr) | 1998-06-04 |
DE69718930D1 (de) | 2003-03-13 |
EP0941588A1 (fr) | 1999-09-15 |
US6418300B1 (en) | 2002-07-09 |
FR2756686A1 (fr) | 1998-06-05 |
DE69718930T2 (de) | 2003-11-13 |
JP4131483B2 (ja) | 2008-08-13 |
FR2756686B1 (fr) | 1999-02-19 |
JP2001505017A (ja) | 2001-04-10 |
ATE232342T1 (de) | 2003-02-15 |
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