WO2010127864A1 - Systeme et procede de protection contre les perturbations engendrees par des signaux fm sur la reception de signaux de bande iii - Google Patents
Systeme et procede de protection contre les perturbations engendrees par des signaux fm sur la reception de signaux de bande iii Download PDFInfo
- Publication number
- WO2010127864A1 WO2010127864A1 PCT/EP2010/002799 EP2010002799W WO2010127864A1 WO 2010127864 A1 WO2010127864 A1 WO 2010127864A1 EP 2010002799 W EP2010002799 W EP 2010002799W WO 2010127864 A1 WO2010127864 A1 WO 2010127864A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- band
- frequency
- signals
- disturbing
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
Definitions
- the invention relates to a protection system for limiting the disturbances caused by signals belonging to the frequency band called "FM" ("Modulated Frequency") on the reception of digital listening signals belonging to the band III.
- FM Modulated Frequency
- the present invention relates to the technical field of radio broadcasting on board motor vehicles for receiving signals belonging to the FM band, that is to say between 87.5 MHz and 108 MHz, as well as digital listening signals. belonging to the band of radio frequency band III, that is to say between 174 MHz and 230 MHz.
- the invention relates to a protection system for limiting the intrusion of strong signals belonging to the FM frequency domain onto listening signals belonging to the band frequency domain III.
- DAB Digital Broadcasting
- the devices for the reception of the band III listening signals have deficiencies with regard to the power of certain FM transmitters. Indeed, sufficiently powerful FM transmitters generate FM signals likely to disturb the reception of listening signals belonging to the domain of band frequencies III. More particularly, the reception of frequency listening signals F 1 belonging to this band III may be disturbed by the emission of a two harmonic FM signal having a frequency F 2 substantially equal to Fi / 2.
- a tuner adapted for receiving digital listening signals of frequency F 1 equal to 200 MHz is disturbed by the transmission of an FM signal of frequency F 2 equal to 100 MHz.
- this disturbance is particularly felt when the power ratio of the FM signal transmitted on the listening signal is greater than 60 dB.
- a high pass filter acts on the entire spectrum of the signal received by the band tuner III while only part of this spectrum belonging to the FM band should be attenuated.
- the realization of a high pass filter involves using a larger number of components, which increases the cost of manufacturing the protection system.
- the present invention aims to eliminate the disadvantages of the state of the art by proposing a protection system for limiting the intrusion of FM signals on the reception of band signals III without unduly limiting the sensitivity of the receiver.
- the object of the invention is to provide a protection system which is not very intrusive on the reception circuit during its use and which disturbs only a small part of the signal received by the band tuner III.
- the invention also aims to limit the number of components used to reduce production costs.
- the present invention proposes to use the FM tuner available in the car radio to identify any signals belonging to a band of FM frequencies likely to disturb the reception of the band listening signal III. If necessary, the protection system can then prevent the reception of these disturbing signals by the band tuner III.
- the invention relates to a protection system against disturbances generated by signals on the reception of a listening signal belonging to the frequency domain of band III, comprising a band III tuner adapted to receive at least one listening signal emitted in the band frequency domain III; an FM tuner adapted to scan an FM frequency band to identify signals present in the FM frequency band; a rejection module adapted to prevent the passage of a frequency range to the band tuner III.
- the system comprises a processing module able to analyze the signals as a function of characteristics of the listening signal so as to identify the reception of at least one disturbing signal capable of disturbing the listening signal, the processing module being able to controlling the rejection module to prevent the passage of a frequency interval to the band tuner III when the reception of at least one disturbing signal is identified.
- the rejection module is composed of a high pass filter adapted to prevent the passage of signals belonging to the FM frequency band.
- the rejection module is composed of an adjustable jet filter capable of preventing the passage of a signal belonging to a 2 MHz frequency band around the disturbing emission frequency F EP .
- the FM tuner is capable of periodically scanning the FM frequency band to identify signals, and preferably every fifteen seconds.
- the invention also relates to a method for protecting against the disturbances generated by signals on the reception of a listening signal belonging to the domain of the band III frequencies, consisting of receiving, via a band III tuner at least one listener signal transmitted in the band frequency domain III; scan an FM frequency band to identify signals belonging to the FM frequency band.
- the method also comprises the following steps: analyzing the signals as a function of characteristics of the listening signal so as to identify the reception of at least one disturbing signal capable of disturbing the listening signal; and preventing the passage of a frequency interval to the band tuner III when the reception of at least one interfering signal is identified.
- the invention relates to a motor vehicle radio comprising a protection system according to the above characteristics.
- a processing module capable of analyzing the characteristics of the signals received by the FM tuner makes it possible to define whether there exists a disturbing FM transmitter as a function of the frequency of the band signal III to be received.
- This processing module also makes it possible to determine whether the power ratio between the signal of the FM band and the band listening signal III is high enough for the reception of this band signal III to be effectively disturbed by the signal. It is thus possible to limit the use of the rejection module to the periods during which a disturbing signal affects the reception of the band listening signal III. Systematic insertion losses are thus avoided.
- rejection module consisting of a high pass circuit makes it possible to prevent the passage of all the signals in the FM frequency range.
- rejection module composed of a notch filter makes it possible to prevent only the passage of the frequency band to be rejected and thus to limit the effects of the rejection module on the band listening signal III.
- Figure 1 is a schematic representation of a first embodiment of the invention
- Figure 2 a schematic representation of a second embodiment of the invention.
- FIG. 1 represents a first embodiment of the protection system according to the invention.
- the protection system comprises a first antenna 2 connected to an FM tuner 4 for receiving FM signals 6 whose transmission frequency belongs to the frequency domain FM, that is to say 87 , 5 MHz at 108 MHz.
- FM signals 6 are characterized more particularly by their transmission frequency and their transmission power.
- the FM tuner 4 is also connected to a processing module 8. Thus, the FM tuner 4 can transmit to the processing module 8 all the information relating to the characteristics of the FM signals 6 received.
- the protection system also comprises a second antenna 12 connected to a band III tuner 14 capable of receiving a listening signal 16 in a frequency range of 174 MHz and 230 MHz.
- This band III tuner 14 is also connected to the processing module 8.
- the band III tuner 14 communicates to the processing module 8 information relating to the frequency F E and the power P E of the listening signal 16 to a moment t.
- the second antenna 12 is connected to the band III tuner 14 via a high-pass filter 20 normally not deactivated.
- This high pass filter 20 can be constructed using passive component of inductance or capacitance type. The desired additional rejection level will depend on the order of the filter and thus the number of elements.
- This high pass filter 20 is switched on / off by means of switches, generally based on active elements (diode, transistors), the control of these switches is the responsibility of the processing module 8.
- the FM tuner 4 regularly performs a scan of the frequencies of the FM band to identify the possible reception of FM signals by the first antenna 2.
- the FM tuner 4 thus acquires information concerning the characteristics, and more particularly the frequency and the transmission power, FM signals 6 received by the first antenna 2. This information is then transmitted to the processing module 8 for analysis.
- the band III tuner 14 is tuned to a listening frequency F E equal to 197.648 MHz, for a power P E measured at -80 dBm. This information concerning the characteristics of the listening signal 16 by the band tuner III is also transmitted to the processing module 8 for analysis.
- the processing module 8 determines, according to the characteristics of the listening signal 16, the characteristics of an FM signal which would be likely to disturb the reception of this listening signal 16. In the example of use above, the processing module 8 selects a frequency band of 2 MHz around the frequency disturbing emission F EP may disturb the listening signal 16, that is to say 98.242 MHz.
- the processing module 8 also determines a threshold power P EP above which an FM signal would actually be disturbing. Preferably, this threshold power P E P is 60 dB greater than the power P E of the listening signal 16. In the example above, this threshold power P E p would be -20dBm.
- the processing module 8 then analyzes the data from the FM tuner 4 according to the data calculated from the characteristics of the listening signal 16. Each FM signal received by the FM tuner is thus analyzed to check whether its frequency and power define a disturbing FM 6 signal likely to disturb the reception of the listening signal 16.
- the processing module 8 then triggers the activation of the rejection module 20.
- the processing module 8 does not trigger the activation of the rejection module 20. There is then no attenuation on the FM band of the spectrum of the listening signal 16 and the sensitivity of the band III tuner 14 is maintained.
- the rejection module 20 used is a high-pass filter. Activation of this high pass filter therefore makes it possible to prevent the passage of the entire FM band of the spectrum of the listening signal 16 to the band tuner III 14.
- the band III tuner 14 is tuned to 197.648 MHz for a field measured at -60 dBm. So, if the FM Tuner 4 detects a 98.5 MHz transmitter of -10 dBm, the high pass filter is activated and adds - 30 dB of rejection at the cost of an insertion loss of only a few dB.
- FIG. 2 shows a second embodiment of a protection system according to the invention. This second embodiment has substantially the same architecture as the first embodiment.
- the protection system also comprises a first antenna 2 connected to an FM tuner 4 for receiving FM signals 6 whose transmission frequency belongs to the FM domain.
- the FM tuner 4 is connected to the processing module 8, which enables it to receive information relating to the characteristics of the FM signals 6 received by the FM tuner 4.
- the protection system also comprises a second antenna 12 connected to a band III tuner 14 capable of receiving a listening signal 16 in the band frequency domain III.
- This band III tuner 14 is also connected to the processing module 8.
- the rejection module 20 is composed of an adjustable jet filter, also called notch filter, to prevent the passage of an adjustable frequency band.
- the width of this band of frequencies attenuated by the notch filter has a width of 2 MHz centered on the disturbing emission frequency F EP calculated by the processing module 8.
- the characteristics of this frequency band attenuated by the The result is that only part of the spectrum of the listening signal 16 is affected by the use of the rejection module 20.
- This tuned filter can be realized using a fixed inductance and a variable capacitance (varicap). At the expense of the processing module 8 to control the voltage required to tune the filter circuit on the frequency to reject or to make the jogger ineffective.
- the summary table presented below illustrates the results obtained by using the two rejection modules 20 of the embodiments of FIGS. 1 and 2.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2010244693A AU2010244693B2 (en) | 2009-05-07 | 2010-05-07 | System and method for protecting against interference generated by FM signals in receiving band III signals |
CN201080019864.8A CN102414993B (zh) | 2009-05-07 | 2010-05-07 | 防止fm信号的干扰的系统和方法和带该系统的机动车无线电 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0902197A FR2945392B1 (fr) | 2009-05-07 | 2009-05-07 | Systeme et procede de protection contre les perturbations engendrees par des signaux fm sur la reception de signaux de bande iii |
FR0902197 | 2009-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010127864A1 true WO2010127864A1 (fr) | 2010-11-11 |
Family
ID=41506483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/002799 WO2010127864A1 (fr) | 2009-05-07 | 2010-05-07 | Systeme et procede de protection contre les perturbations engendrees par des signaux fm sur la reception de signaux de bande iii |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN102414993B (fr) |
AU (1) | AU2010244693B2 (fr) |
FR (1) | FR2945392B1 (fr) |
WO (1) | WO2010127864A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4654884A (en) * | 1984-05-10 | 1987-03-31 | Alps Electric Co., Ltd. | Radio receiver with switching circuit for elimination of intermodulation interference |
EP1022873A2 (fr) * | 1999-01-22 | 2000-07-26 | Sony Corporation | Récepteur pour la réception de transmissions de radiodiffusion numérique ainsi que de transmissions de radiodiffusion en modulation de fréquence, comportant des données supplémentaires |
GB2408899A (en) * | 2003-12-04 | 2005-06-08 | Imagination Tech Ltd | DAB receiver which looks up non-interfering digital processing clock frequencies from a table for each RF reception channel |
US20080152049A1 (en) * | 2006-12-08 | 2008-06-26 | Texas Instruments Deutschland Gmbh | Digital audio broadcast receiver |
-
2009
- 2009-05-07 FR FR0902197A patent/FR2945392B1/fr active Active
-
2010
- 2010-05-07 AU AU2010244693A patent/AU2010244693B2/en active Active
- 2010-05-07 CN CN201080019864.8A patent/CN102414993B/zh active Active
- 2010-05-07 WO PCT/EP2010/002799 patent/WO2010127864A1/fr active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4654884A (en) * | 1984-05-10 | 1987-03-31 | Alps Electric Co., Ltd. | Radio receiver with switching circuit for elimination of intermodulation interference |
EP1022873A2 (fr) * | 1999-01-22 | 2000-07-26 | Sony Corporation | Récepteur pour la réception de transmissions de radiodiffusion numérique ainsi que de transmissions de radiodiffusion en modulation de fréquence, comportant des données supplémentaires |
GB2408899A (en) * | 2003-12-04 | 2005-06-08 | Imagination Tech Ltd | DAB receiver which looks up non-interfering digital processing clock frequencies from a table for each RF reception channel |
US20080152049A1 (en) * | 2006-12-08 | 2008-06-26 | Texas Instruments Deutschland Gmbh | Digital audio broadcast receiver |
Also Published As
Publication number | Publication date |
---|---|
CN102414993A (zh) | 2012-04-11 |
FR2945392A1 (fr) | 2010-11-12 |
FR2945392B1 (fr) | 2011-04-22 |
AU2010244693A1 (en) | 2011-11-24 |
CN102414993B (zh) | 2014-09-24 |
AU2010244693B2 (en) | 2014-06-19 |
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