EP3228031B1 - Procédé et dispositif pour recevoir un signal de radiodiffusion - Google Patents

Procédé et dispositif pour recevoir un signal de radiodiffusion Download PDF

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Publication number
EP3228031B1
EP3228031B1 EP15775462.3A EP15775462A EP3228031B1 EP 3228031 B1 EP3228031 B1 EP 3228031B1 EP 15775462 A EP15775462 A EP 15775462A EP 3228031 B1 EP3228031 B1 EP 3228031B1
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EP
European Patent Office
Prior art keywords
signal
detected
field strength
current time
broadcast radio
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EP15775462.3A
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German (de)
English (en)
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EP3228031A1 (fr
Inventor
Manh-Thang Tran
Marcus Risse
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas

Definitions

  • the present invention relates to a method for receiving a radio signal, to a corresponding device and to a corresponding computer program.
  • AM radio receivers that use amplitude modulation as a type of modulation generally have a search function in order to set and play back the next receivable station based on a set reception frequency.
  • the reception frequency can be increased or decreased by a fixed frequency step.
  • the new reception frequency can now be used, for example, to check whether a reception field strength is greater than a threshold value and whether further quality values indicating interference are less than a threshold value. If all criteria are met, the search can be ended using the current frequency for playback.
  • EP 2 187 530 A1 discloses a method for receiving a broadcast signal.
  • a broadcast signal can be understood to mean an amplitude-modulated signal such as a long, medium or short-wave signal from a radio transmitter.
  • a signal quality of the radio signal can be characterized, for example, by a reception field strength of the radio signal, a disturbance of the radio signal or a reception field strength of neighboring signals of the radio signal.
  • a reference point in time can be understood to mean a point in time before the current point in time.
  • the step of reading in can be carried out repeatedly in a predetermined rhythm in order to read in a plurality of reference information, wherein each reference information represents a signal quality of the radio signal detected at a different reference time.
  • the reference information can, for example, be held in a suitable memory, also called a landscape memory, for a predetermined period of time and can be read in from there in the reading step.
  • the steps of reading in and receiving can be carried out simultaneously or in succession in any order.
  • the signal quality of the radio signal recorded at the current time can be checked in the checking step, for example with the aid of various threshold value comparisons.
  • the threshold values used here can be selected such that the radio signal has a sufficiently high reproduction quality if the test is successful.
  • the approach presented here is based on the knowledge that a signal quality of a receivable broadcast signal can be checked as a function of an earlier signal quality of the broadcast signal. As a result, fluctuations in the signal quality due to reception time can be recorded and taken into account when testing the radio signal. For example, a search function of a radio receiver can be controlled by such a test in such a way that a consistently good reproduction quality is guaranteed at different reception times of the radio signal.
  • the reception of AM stations can depend heavily on the time of day. While relatively few transmitters can be received during the day due to the daytime attenuation in the area of the long, medium and short wave bands, significantly more transmitters can be received during twilight and at night. However, many of these transmitters can be disturbed by strong field strength loss, English fading, adjacent channel interference or other electromagnetic interference.
  • time-dependent signal impairments can now be taken into account when searching for a station by not only reacting to currently determined signal quality parameters such as a reception field strength or other interference indicating quality values, but also using signal information stored in a landscape memory to determine a respective reception quality of the stations.
  • the signal information can be determined, for example, in a separate signal processing path in addition to a playback path.
  • the search run can be designed so that stations with a sufficiently good reception quality are reproduced at any time of the day.
  • the method is provided with a step of determining a test threshold value using the reference information.
  • the signal quality recorded at the current time is compared with the test threshold.
  • the signal quality recorded at the current time is further checked in the step of checking if it exceeds the checking threshold.
  • a test threshold value can be understood to mean a reception field strength that the broadcast signal must have at least in order to be checked in the checking step.
  • the test threshold value can be predetermined as a function of a number of receivable broadcast signals that exceed a certain field strength threshold and fall below a certain interference threshold.
  • the test threshold value can be used to prevent broadcast signals that are poor in signal quality from the start and therefore not suitable for playback from being further tested. This can increase the efficiency of the method.
  • the test threshold value can also be determined using the additional reference information.
  • An additional broadcast signal can be understood to mean a transmission channel that deviates from the broadcast signal.
  • the signal quality of the additional broadcast signal can be recorded either at the reference time or at an additional reference time that deviates therefrom.
  • the additional reference information can be used, for example, to determine a general quality of a radio reception over a frequency range comprising several radio signals.
  • the test threshold can be determined depending on the general quality of the radio reception. For example, a low test threshold can be selected if there are only a few readily receivable radio signals, or a high test threshold can be selected if there are many easily receivable radio signals.
  • a disturbance can be understood to mean a measured value of the radio signal which represents an impairment of the signal quality or a signal which interacts with the radio signal.
  • a neighboring signal can be understood to mean a signal such as an adjacent radio transmitter whose frequency range is adjacent to or at least close to a frequency range of the radio signal. Using such reference information, the signal quality of the broadcast signal can be determined comprehensively and with great accuracy.
  • the reading step at least further reference information about a signal quality of the radio signal acquired at a further reference point in time is read in.
  • the signal quality recorded at the current time can also be checked using the further reference information. Because the signal quality recorded at the current point in time in the test step can be compared with at least two older signal qualities recorded at a different point in time, for example, a loss of field strength of the radio signal can be reliably determined.
  • a deviation is determined between the received field strength recorded at the reference time and the received field strength recorded at the current time.
  • the deviation can be compared to a specified deviation value.
  • a variation of the respective reception strengths can be determined.
  • a field strength fluctuation of the radio signal can be identified by comparing the deviation with the deviation value.
  • an average fault value can be formed from the fault recorded at the reference point in time and the fault recorded at the current point in time.
  • the mean disturbance value can be compared with a predetermined disturbance value.
  • the difference value, the deviation value or the disturbance value can be predetermined as a function of a speed of a vehicle receiving the radio signal in the step of checking.
  • the deviation value and the disturbance value can be higher at high speed than at low speed. This ensures consistently good reproduction of the radio signal even at different speeds.
  • the method can be provided with a step of reproducing the radio signal.
  • the step of reproducing can be carried out if, in the step of checking, the field strength mean value is at most greater than the received field strength at the current value by the difference value or, additionally or alternatively, the deviation is smaller than the deviation value or, additionally or alternatively, the Mean disturbance value is less than the disturbance value. This can ensure that the broadcast signal is only reproduced if a sufficiently good reproduction quality has resulted in the test step.
  • a device can be understood to mean an electrical device that processes sensor signals and outputs control and / or data signals as a function thereof.
  • the device can have an interface that can be designed in terms of hardware and / or software.
  • the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the device.
  • the interfaces are separate, integrated circuits or at least partially consist of discrete components.
  • the interfaces can be software modules that are present, for example, on a microcontroller in addition to other software modules.
  • a computer program product or computer program with program code which can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory and for carrying out, implementing and / or controlling the steps of the method according to one of the embodiments described above is used, especially if that Program product or program is executed on a computer or device.
  • Fig. 1 shows a block diagram of a device 100 according to an embodiment of the present invention.
  • the device 100 for receiving a radio signal comprises a reading unit 102, a receiving unit 104 and a test unit 106.
  • the reading unit 102 is designed to read in reference information 108 about a signal quality of the radio signal detected at a reference time.
  • the receiving unit 104 is designed to receive signal information 110 about a signal quality of the radio signal detected at a current point in time.
  • the test unit 106 is designed to receive the information 108, 110 and to use the information 108, 110 to test the signal quality detected at the current time.
  • the test unit 106 is designed to test the signal quality recorded at the current time by means of various threshold value comparisons.
  • the reading unit 102 and the receiving unit 104 can be connected to a suitable receiver for receiving the radio signal via separate interfaces or a common interface.
  • the reading-in unit 102 or the receiving unit 104 is designed to receive the reference information 108 or the signal information 110 directly from the receiver.
  • the reading unit 102 and the receiving unit 104 are designed to each receive the broadcast signal from the receiver and to generate the reference information 108 and the signal information 110 themselves using the broadcast signal.
  • the device 100 has a determination unit 112 which is coupled to the reception unit 104 and the test unit 106 and which is designed to determine a test threshold value 114 using the reference information 108 and to send this to the test unit 106.
  • the investigative work is 112 in Fig. 1 coupled to the read-in unit 102 in order to receive the signal information 108 and also to determine the test threshold value 114 using the signal information 108.
  • the test unit 106 is designed to subject the signal quality of the broadcast signal, hereinafter called the current signal quality for short, to an input test using the test threshold value 114.
  • this input test reveals that the current signal quality is above the test threshold value 114, then the current signal quality is checked by the test unit 106 on the basis of further test criteria, as are described in more detail below. If, on the other hand, the current signal quality is below the test threshold value 114, the test of the radio signal by the test unit 106 is terminated.
  • the test unit 106 is designed to generate a reproduction signal 116 in response to a successful test of the current signal quality using the further test criteria, that is to say if the radio signal is expected to have a good reproduction quality.
  • a playback device coupled to device 100 may be configured to receive playback signal 116 received and reproduce the broadcast signal using the playback signal 116.
  • the read-in unit 102 can be designed to read in at least further reference information 118 about a signal quality of the radio signal detected at a further reference time or at least one additional reference information 120 about a signal quality of an additional radio signal detected at the reference time or at a time different from the reference time .
  • the further reference point in time and the additional reference point in time can each represent a point in time preceding the current point in time, analogously to the reference point in time.
  • the determination unit 112 can be designed to receive the additional reference information 120 from the read-in unit 102 and also to determine the test threshold value using the additional reference information 120.
  • the test unit 106 can be designed to receive the further reference information 118 from the read-in unit 102 and also to test the current signal quality of the broadcast signal using the further reference information 118.
  • Fig. 2 shows a schematic representation of a receiving system 200 with a device 100 according to an embodiment of the present invention.
  • the device 100 is, for example, a device such as that shown in FIG Fig. 1 is described.
  • the receiving system 100 can be part of a radio receiver.
  • the radio receiver can be suitable for use in a vehicle.
  • the receiving system 200 comprises a first signal processing path 202, also called a reproduction path, and a second signal processing path 204.
  • the receiving system 200 can optionally also be implemented with more than two signal processing paths.
  • the signal processing paths 202, 204 are designed to process amplitude-modulated signals.
  • the playback path 202 has a high-frequency processing unit 206, which is designed to assign a high-frequency signal as a broadcast signal 208 to process.
  • the radio signal 208 is, for example, filtered, mixed and amplified in the high-frequency processing unit 206.
  • the reproduction path 202 further comprises a signal processing block serving as a demodulation unit 210, which is coupled to the high-frequency processing unit 206 in order to demodulate the amplitude-modulated broadcast signal 208.
  • a signal processing block serving as a demodulation unit 210, which is coupled to the high-frequency processing unit 206 in order to demodulate the amplitude-modulated broadcast signal 208.
  • the second signal processing path 204 comprises a further high-frequency processing unit 214, a further demodulation unit 216 and a further information providing unit 218.
  • the device 100 is designed to execute control software for controlling the signal processing paths 202, 204.
  • the device 100 reads out the values determined in the information providing units 212, 218. These values can include the reference information 108, 118, 120 and the signal information 110.
  • the device 100 also controls the high-frequency processing units 206, 214 in order to set different reception frequencies.
  • the device 100 can be implemented with a so-called landscape memory, in which several entries for each AM reception frequency about a respective reception field strength and respective fault information are stored together with time information.
  • the landscape memory is configured to store ten different entries for each AM reception frequency. Are for a specific AM reception frequency If ten entries already exist, the oldest value is overwritten when a new value is entered.
  • the device 100 controls the second signal processing path 204 so that it runs through the AM reception frequencies supported by the radio receiver in a fixed time schedule or when it is not required for other tasks.
  • the reception field strength and the interference information for each set AM reception frequency are entered in the landscape memory together with a time stamp.
  • the device 100 reads out the landscape memory in a fixed rhythm.
  • the device 100 can be designed to determine the test threshold value for an AM search run depending on a number of those transmitters which exceed a certain field strength threshold and fall below a certain interference threshold. If the landscape memory contains a few easily receivable transmitters, the test threshold is set accordingly low. If, on the other hand, many transmitters can be received well, the test threshold is set accordingly high.
  • the device 100 is designed to immediately activate the second signal processing path 204 in response to the start of an AM search by a user of the radio receiver. This activates a search run from a current reception frequency of the playback path 202, also called the reception reception or playback signal path, in a direction defined by the user.
  • the values determined for the reception field strength and the disturbance information are entered in the landscape memory together with a time stamp.
  • the device 100 After a short delay, the device 100 now also starts an AM search in the playback path 202.
  • a current value of the reception field strength and current quality values for example a disturbance of the reception frequency or a reception field strength of adjacent reception frequencies, are determined on each reception frequency. If the received field strength is below the determined test threshold value, which can also be referred to as the search threshold value, the device 100 sets the next received frequency. The test is now carried out again. If the reception field strength of the next reception frequency is above the determined test threshold value, the device 100 checks all entries in the landscape memory for the set reception frequency as well as the entries for the respectively adjacent channels. Only those entries are considered that do not exceed a specified age of 10, 15 or 30 minutes, for example.
  • the device 100 now checks one or more of the following criteria.
  • the device 100 checks whether a variation in the received field strengths stored in the landscape memory, including the currently determined received field strength, is less than a predetermined deviation threshold value.
  • the device 100 checks whether an average fault value of the fault information stored in the landscape memory, including the currently determined fault information, is less than a predetermined fault threshold value.
  • the device 100 checks whether a field strength mean value of the reception field strengths of the adjacent channels stored in the landscape memory is at most a larger amount than the current reception field strength.
  • the device 100 can be designed to control the respective threshold values for the criteria specified above as a function of a driving speed of the vehicle. If the vehicle is stationary, the threshold values for the field strength variation and the interference information can be set low. If the vehicle is moving, the threshold values can be increased accordingly.
  • the first criterion determines whether a transmitter with a high field strength fluctuation is received at the current reception frequency. Is this the If so, the current reception frequency is not reproduced. Averaged fault information is evaluated via the second criterion, which allows a more accurate picture than a one-time measurement.
  • the third criterion suppresses transmitters with a very strong adjacent channel, since interference with the adjacent channel can be expected here.
  • the device 100 stops the AM search on the playback path 202 and releases the set reception frequency for playback.
  • Fig. 3 shows a flowchart of a method 300 according to an embodiment of the present invention.
  • the method 300 for receiving a radio signal can, for example, be carried out by a device such as that shown in FIG Figures 1 and 2nd described.
  • method 300 for AM search optimization can be carried out.
  • reference information is first read in about a signal quality of the radio signal detected at a reference time.
  • signal information about a signal quality of the radio signal detected at a current point in time is received.
  • Steps 302, 304 can be carried out simultaneously or in any order.
  • the signal quality detected at the current point in time is checked using the signal information under reference information in order to determine a reproduction quality of the broadcast signal.
  • a reception field strength of the broadcast signal a disturbance of the broadcast signal or a reception field strength of at least one neighboring signal of the broadcast signal can be read in as information about a signal quality of the broadcast signal.
  • an embodiment includes a "and / or" link between a first feature and a second feature, it should be read in such a way that the embodiment according to one embodiment has both the first feature and the second feature and according to another embodiment either only that has the first feature or only the second feature.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Claims (12)

  1. Procédé (300) de réception d'un signal de radiodiffusion (208), le procédé (300) comprenant les étapes suivantes :
    la lecture (302) d'une information de référence (108) concernant une qualité de signal du signal de radiodiffusion (208), détectée à un instant de référence ;
    la réception (304) d'une information de signal (110) concernant une qualité de signal du signal de radiodiffusion (208), détectée à un instant actuel ; et
    le contrôle (306) de la qualité de signal détectée à l'instant actuel en utilisant l'information de signal (110) et l'information de référence (108) pour déterminer une qualité de reproduction du signal de radiodiffusion (208),
    caractérisé en ce que le procédé (300) comprend une étape de détermination d'une valeur seuil de contrôle (114) en utilisant l'information de référence (108), dans lequel, à l'étape de contrôle (306), la qualité de signal détectée à l'instant actuel est contrôlée davantage si la qualité de signal détectée à l'instant actuel dépasse la valeur seuil de contrôle (114) et la qualité de signal détectée à l'instant actuel n'est pas contrôlée davantage si la qualité de signal détectée à l'instant actuel soupasse la valeur seuil de contrôle (114).
  2. Procédé (300) selon la revendication 1, dans lequel, à l'étape de lecture (302), au moins une information de référence supplémentaire (120) concernant une qualité de signal d'un signal de radiodiffusion supplémentaire, détectée à l'instant de référence ou à un instant de référence supplémentaire, est lue, dans lequel, à l'étape de détermination, la valeur seuil de contrôle (114) est en outre déterminée en utilisant l'information de référence supplémentaire (120) .
  3. Procédé (300) selon l'une quelconque des revendications précédentes, dans lequel, à l'étape de lecture (302), l'information de référence (108) représente une intensité de champ de réception du signal de radiodiffusion (208), détectée à l'instant de référence, et/ou une interférence du signal de radiodiffusion (208) et/ou une intensité de champ de réception au moins d'un signal voisin du signal de radiodiffusion (208), dans lequel, à l'étape de réception (304), l'information de signal (110) représente une intensité de champ de réception du signal de radiodiffusion (208), détectée à l'instant actuel, et/ou une interférence du signal de radiodiffusion (208) et/ou une intensité de champ de réception du signal voisin.
  4. Procédé (300) selon l'une quelconque des revendications précédentes, dans lequel, à l'étape de lecture (302), au moins une information de référence (118) supplémentaire concernant une qualité de signal du signal de radiodiffusion (208), détectée à un instant de référence supplémentaire, est lue, dans lequel, à l'étape de contrôle (306), la qualité de signal détectée à l'instant actuel est contrôlée en outre en utilisant l'information de référence (118) supplémentaire.
  5. Procédé (300) selon la revendication 3 et 4, dans lequel, à l'étape de lecture (302), l'information de référence supplémentaire (118) représente une intensité de champ de réception du signal voisin, détectée à l'instant de référence supplémentaire, dans lequel, à l'étape de contrôle (306), une moyenne d'intensité de champ est formée à partir de l'intensité de champ de réception du signal voisin, détectée à l'instant de référence, et de l'intensité de champ de réception du signal voisin, détectée à l'instant de référence supplémentaire, une différence entre la moyenne d'intensité de champ et l'intensité de champ de réception détectée à l'instant actuel étant déterminée et comparée à une valeur de différence prédéfinie.
  6. Procédé (300) selon la revendication 3 ou 5, dans lequel, à l'étape de contrôle (306), un écart entre l'intensité de champ de réception détectée à l'instant de référence et l'intensité de champ de réception détectée à l'instant actuel est déterminé, l'écart étant comparé à une valeur d'écart prédéfinie.
  7. Procédé (300) selon l'une quelconque des revendications 3, 5 ou 6, dans lequel, à l'étape de contrôle (306), une moyenne d'interférence est formée à partir de l'interférence détectée à l'instant de référence et de l'interférence détectée à l'instant actuel, la moyenne d'interférence étant comparée à une valeur d'interférence prédéfinie.
  8. Procédé (300) selon l'une quelconque des revendications 5 à 7, dans lequel, à l'étape de contrôle (306), la valeur de différence et/ou la valeur d'écart et/ou la valeur d'interférence sont prédéfinies en fonction d'une vitesse d'un véhicule recevant le signal de radiodiffusion (208).
  9. Procédé (300) selon l'une quelconque des revendications 5 à 8, comprenant une étape de reproduction du signal de radiodiffusion (208) si à l'étape de contrôle (306) la moyenne d'intensité de champ est supérieure à l'intensité de champ de réception détectée à l'instant actuel au plus de la valeur de différence et/ou si l'écart est inférieur à la valeur d'écart et/ou si la moyenne d'interférence est inférieure à la valeur d'interférence.
  10. Dispositif (100) pour recevoir un signal de radiodiffusion (208), le dispositif (100) présentant les particularités suivantes :
    une unité de lecture (102) pour lire une information de référence (108) concernant une qualité de signal du signal de radiodiffusion (208), détectée à un instant de référence ;
    une unité de réception (104) pour recevoir une information de signal (110) concernant une qualité de signal du signal de radiodiffusion (208), détectée à un instant actuel ; et
    une unité de contrôle (106) pour contrôler la qualité de signal détectée à l'instant actuel en utilisant l'information de signal (110) et l'information de référence (108) pour déterminer une qualité de reproduction du signal de radiodiffusion (208),
    caractérisé en ce que le dispositif (100) comprend une unité de détermination (112) pour déterminer une valeur seuil de contrôle (114) en utilisant l'information de référence (108), l'unité de contrôle (106) étant réalisée pour contrôler la qualité de signal détectée à l'instant actuel davantage si la qualité de signal détectée à l'instant actuel dépasse la valeur seuil de contrôle (114) et de ne pas contrôler la qualité de signal détectée à l'instant actuel davantage si la qualité de signal détectée à l'instant actuel soupasse la valeur seuil de contrôle (114) .
  11. Programme informatique configuré pour amener un ordinateur à effecteur toutes les étapes d'un procédé (300) selon l'une quelconque des revendications 1 à 9 lorsque le programme informatique est exécuté sur l'ordinateur.
  12. Support de stockage lisible par machine avec un programme informatique selon la revendication 11 stocké sur celui-ci.
EP15775462.3A 2014-12-05 2015-10-09 Procédé et dispositif pour recevoir un signal de radiodiffusion Active EP3228031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014225043.9A DE102014225043A1 (de) 2014-12-05 2014-12-05 Verfahren und Vorrichtung zum Empfangen eines Rundfunksignals
PCT/EP2015/073334 WO2016087099A1 (fr) 2014-12-05 2015-10-09 Procédé et dispositif de réception d'un signal de radiodiffusion

Publications (2)

Publication Number Publication Date
EP3228031A1 EP3228031A1 (fr) 2017-10-11
EP3228031B1 true EP3228031B1 (fr) 2020-05-06

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EP15775462.3A Active EP3228031B1 (fr) 2014-12-05 2015-10-09 Procédé et dispositif pour recevoir un signal de radiodiffusion

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EP (1) EP3228031B1 (fr)
CN (1) CN107005321B (fr)
DE (1) DE102014225043A1 (fr)
WO (1) WO2016087099A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP4352976B2 (ja) * 2004-04-20 2009-10-28 株式会社日立製作所 受信装置及び受信方法
US7711033B2 (en) * 2005-04-14 2010-05-04 Telefonaktiebolaget Lm Ericsson (Publ) SIR prediction method and apparatus
JP2006323973A (ja) * 2005-05-20 2006-11-30 Matsushita Electric Ind Co Ltd 信号処理装置及び方法
EP2187530A4 (fr) * 2007-08-24 2011-12-28 Mitsubishi Electric Corp Récepteur de radiodiffusion

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WO2016087099A1 (fr) 2016-06-09
DE102014225043A1 (de) 2016-06-09
CN107005321A (zh) 2017-08-01
EP3228031A1 (fr) 2017-10-11
CN107005321B (zh) 2019-10-15

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