EP3005591B1 - Evaluation and acoustic emission of audio broadcasting signals in a vehicle - Google Patents

Evaluation and acoustic emission of audio broadcasting signals in a vehicle Download PDF

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Publication number
EP3005591B1
EP3005591B1 EP14705478.7A EP14705478A EP3005591B1 EP 3005591 B1 EP3005591 B1 EP 3005591B1 EP 14705478 A EP14705478 A EP 14705478A EP 3005591 B1 EP3005591 B1 EP 3005591B1
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EP
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Prior art keywords
reception path
reception
switchover
path
threshold value
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EP14705478.7A
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German (de)
French (fr)
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EP3005591A1 (en
Inventor
Frank Oldewurtel
Christian Winter
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Audi AG
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Audi AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
    • H04H20/62—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast for transportation systems, e.g. in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/24—Arrangements for distribution of identical information via broadcast system and non-broadcast system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/26—Arrangements for switching distribution systems

Definitions

  • the invention relates to a method for acoustically broadcasting radio signals in a vehicle, in which radio signals can be transmitted into the vehicle via a first and at least one second receiving path and received there, the first receiving path being evaluated by at least one criterion parameter based on a radio signal that can be received via it is, and the second reception path is also evaluated by a criterion parameter on the basis of the radio signal that can be received via it.
  • Radio programs are traditionally consumed in the vehicle and mainly via analog radio reception using AM (amplitude modulation) or FM (frequency modulation) in the vehicle.
  • the digital radio reception of radio programs for example in the form of DAB (Digital Audio Broadcast), has been available as a further reception method for several years.
  • An innovation for appropriately equipped vehicles is radio reception from the Internet via the mobile radio channel, i.e. Internet radio as an additional reception channel.
  • the internet radio does not use any physical radio transmitters that have to be set up stationary. From the user's point of view, all reception paths have different advantages and disadvantages in terms of audio quality, latency to the original signal, reception range and costs, which makes switching between different reception paths attractive for the user.
  • the EP 2 244 481 A1 provides a mobile terminal device which has a memory, a screen and a wireless communication unit.
  • the wireless communication unit has a first module to receive a first transmission signal and a second module to receive a second transmission signal and a control unit.
  • the control unit controls the wireless communication unit in such a way that, if a signal strength of the first transmission signal falls below a first threshold value, the second module receives the second transmission signal and stores it temporarily in the memory, while content is displayed on the screen that corresponds to the first transmission signal correspond.
  • the JP H11 196 009 A describes a method for switching between DAB and RDS car radio reception, in which a reception quality is compared with a predetermined limit value at regular intervals. If the limit value is undershot for a predetermined period of time, then there is a switchover from the DAB radio to the RDS radio or vice versa.
  • the US 2010/0203823 A1 describes a method for continuing playback of multimedia content in which content is received by a mobile unit via a radio transmission.
  • a data connection is established here, via which the same content can be called up as via the radio transmission.
  • the content is received by the data connection and played back.
  • the US 2013/0053058 A1 describes a method in which the user can specify how precise the match should be when switching from a delayed reception path to a delay-free reception path.
  • the object of the present invention is to make the transmission of radio signals in the vehicle more user-friendly when a reception path is changed.
  • this object is achieved by a method, by an information display system and by a vehicle having the features according to the respective independent claims.
  • the method according to the invention for acoustically emitting radio signals in a vehicle includes the possibility of transmitting radio signals into the vehicle via a first and at least one second receiving path or receiving channel and being able to receive them there.
  • the first reception path is evaluated using a radio signal that can be received via it by at least one criterion parameter
  • the second reception path is also evaluated using the radio signal that can be received via it by a criterion parameter.
  • the criterion parameter can be a single parameter such as a measured variable, but also a higher-level parameter that contains several individual parameters.
  • the evaluation of the radio signals or the reception paths takes place continuously and simultaneously, with a check in discrete time intervals also being possible.
  • the criterion parameters of the reception paths can be identical, that is to say comprise identical measured variables and / or parameters. However, they can also include measured variables and / or parameters that differ from one another, and then, for example, using a comparison list or an algorithm, are converted into one another and compared.
  • a preparation phase is started as a function of a comparison of the criterion parameter of the current reception path with a first threshold value.
  • This preparatory phase is used to prepare for a subsequent switchover from the current reception path, if necessary. that is, the reception path via which the currently acoustically transmitted radio signal is received, to the other reception path or, if several reception paths are available, the best reception path according to the evaluation by the criterion parameter.
  • the criterion parameter of the current reception path is compared with a second threshold value, which is lower than the first threshold value, and a switch to the other reception path is checked if the second threshold value is not reached.
  • a switchover is first prepared after a comparison with the first threshold value.
  • the quality of the broadcast radio signal continues to deteriorate, which is recognized by the criterion parameter when the second threshold value is not reached, a switch to another reception path is checked.
  • a preferred embodiment of the method according to the invention provides that when checking the switchover, the criterion parameter of the other reception path is also compared with the second threshold value, and a switch is made to the other reception path if this criterion parameter does not fall below the second threshold value or if it falls below this value less than falling below the criterion parameter of the current reception path.
  • An advantageous embodiment of the method according to the invention provides that the radio signal received during the preparation phase via the other reception path and to be transmitted after a switch to the other reception path that may still have to take place is buffered.
  • This has the particular advantage that the sequential switching can be designed to be particularly pleasant for the user, for example without any gaps, and, for example, inaudible switching can also be implemented using a correlation method. A complete transfer of information is thereby achieved.
  • the preferred scope of the temporary storage, in particular the amount of temporarily stored information, is to be selected in principle as a function of current environmental conditions such as the local position of the vehicle, weather conditions or local reception conditions.
  • the buffering is only started if the other receiving path is one in which an information presentation of the information contained in the radio signal is offset in time by an offset time interval - that is, delayed or also in advance of the information presentation via the current reception path is carried out.
  • the buffering is started when at least one of the other reception paths that may be considered for the future acoustic transmission or presentation of the radio signal is a reception path in which the radio signals are transmitted via a mobile radio channel.
  • the Internet radio is a possible reception path for broadcasting the radio signal. This has the advantage that the delays occurring in a mobile radio channel due to intermediary providers and fluctuations in the Transmission rate, in particular immediately after a connection has been established, and in particular also a variable, but predetermined time offset by the Internet radio provider, can be compensated for by buffering.
  • This has the advantage that the particularly noticeable time offset between a radio-based reception path, in particular a delay-free reception path such as FM or AM, can be compensated for with Internet radio that is significantly delayed, for example up to thirty seconds or even more, and the resulting pauses be avoided in the transmission of the radio signal.
  • a preferred embodiment of the method according to the invention provides that the preparation phase, in particular the temporary storage, is ended when an actual switchover to the other reception path is carried out and / or the first threshold value is exceeded again towards higher values by the criteria parameter values at least for a predeterminable time interval that is exceeded will.
  • This has the advantage that unnecessary caching is avoided. This is the case, for example, if a switch was made to a reception path that does not require intermediate storage or if future switching is no longer an option due to an improvement in the quality of the radio signal received via the current reception path, so that intermediate storage is no longer necessary .
  • the predeterminable exceedance time interval ensures that there is a short-term improvement in quality the current reception path does not lead to a deletion of the buffer, which may be required shortly afterwards.
  • the predeterminable exceedance time interval is specified in such a way that short improvements in the quality of the current reception path, that is to say in particular sudden, delta-peak-like improvements in quality, do not lead to the caching being terminated.
  • a predeterminable exceeding time interval can be, for example, two seconds.
  • the duration of the exceeding time interval can be dynamically determined or changed as a function of changing environmental conditions, or it can be predetermined in advance.
  • a further embodiment of the method according to the invention provides that a switchover from the current reception path to the other reception path takes place depending on whether the criterion parameter values fall below the second threshold value for at least one predeterminable time interval below the threshold.
  • the advantage here is that the quality of the reception paths is mapped directly and immediately, i.e. very quickly, in the criterion parameter.
  • the criterion parameter of the different reception paths can be made using signal processing steps and / or other mathematical methods or calculations - for example using averaging, weighted integration, or convolution with a core - as a variable from the respective reception field strength and / or in the respective signal-to-noise Ratio (SNR) and / or the respective bit error rate (BER) and / or the available data rate in the cellular network used and / or the type of radio network and / or any required roaming and / or the decoder audio quality (service) and / or the fast information Channel (FIC) and / or the Received Signal Strength Indicator (RSSI) and / or an existing stereo / mono switch and / or a cost factor, which, for example, depicts energy consumption and / or resource use and / or monetary costs in connection with the reception path, processed in such a way that the temporal course of the individual listed variables over be considered and in particular individual short-term or immediately after a switchover occurring overshoot
  • the criterion parameter of the different reception paths is processed as a variable in such a way that expected changes in the respective reception field strength and / or the respective signal-to-noise ratio (SNR) and / of the respective bit error rate (BER) and / or the available data rate in the cellular network used and / or the type of radio network and / or any required roaming and / or the decoder Audio Quality (Service) and / or the Fast Information Channel (FIC) and / or the Received Signal Strength Indicator (RSSI ) and / or an existing stereo / mono switchover and / or a cost factor which, for example, depicts energy consumption and / or resource use and / or monetary costs in connection with the reception path, can also be taken into account.
  • SNR signal-to-noise ratio
  • BER bit error rate
  • BER bit error rate
  • BER bit error rate
  • BER bit error rate
  • Switching to a delayed reception path can preferably take place via fading or a so-called “mute".
  • a delayed reception path such as Internet radio or digital audio broadcast (DAB)
  • DAB digital audio broadcast
  • switching from a delayed reception path such as Internet radio or DAB to a delay-free reception path such as FM or AM can take place in two different ways: either without maintaining the delay, i.e. with skipping information, or with maintaining the delay , that is without skipping information - in the latter case then in particular with the aid of a correlation method and intermediate storage of the radio signal from the delay-free reception path.
  • These two options take place either in accordance with a basic pre-setting of the user or on a specific choice or prompt by the user, which is made via a user option in the human-machine interface (HMI) of a control device or as a hardware solution in the form of an operating element, such as a button or button.
  • HMI human-machine interface
  • the advantage is that the user can choose a Switching can either switch "live", ie that the information that the user receives is again up-to-date and without delay, or that the user can continue to follow the current flow of information without interruption, without jumping the flow of information.
  • the invention also includes an information presentation system for the acoustic transmission of radio signals in a vehicle, with at least one acoustic source and a receiving unit for receiving radio signals, which includes the function in particular of receiving, evaluating the signals and controlling switching between the reception paths.
  • This includes at least two reception paths for transmitting radio signals to the receiving unit, with radio signals being transmitted into the vehicle and received there via a first and at least one second receiving path, the first receiving path being based on a radio signal that can be received via it by means of at least one criterion parameter by the receiving unit is assessed in terms of quality, and the second reception path is also assessed by the receiving unit on the basis of the radio signal that can be received via it by means of a criterion parameter.
  • the receiving unit is designed in such a way that, during a broadcast of the radio signal via one of the receiving paths, the current receiving path, depending on a comparison of the criterion parameter of the current receiving path with a first threshold value, a preparatory phase to prepare for a switchover from the current receiving path. That is, the reception path currently intended for transmission is started on the other reception path, or in the case of several other reception paths on the best of these reception paths according to the respective criterion parameters, and in the preparation phase the criterion parameter of the current reception path with a threshold value compared to the first The lower second threshold value is compared, and if the value falls below the second threshold value, a switch to the other reception path is checked.
  • the receiving unit is designed in such a way that the switchover from a delayed to a non-delayed receiving path takes place either without maintaining the delay or with maintaining the delay, in that the receiving unit is designed so that these two possibilities either according to a basic pre-setting of the user or to a concrete choice or prompting of the user to take place, which are about a user option in a human-machine interface (HMI) of a control device or as a hardware solution in the form of a control element.
  • HMI human-machine interface
  • the invention also comprises a vehicle with such an information presentation system as described above or an advantageous embodiment thereof.
  • a first step 1 here comprises a continuous and simultaneous ongoing checking of the reception quality of the available reception paths, ie a checking of the criterion parameters of all reception paths.
  • the criterion parameter of the selected i.e. currently used for broadcasting, is Received path compared with the predetermined first and second threshold. If the value of the criterion parameter is above the first value of the first threshold, no further action is carried out, but rather the ongoing checking of the reception quality according to step 1 is continued.
  • step 3 a change to the one or, in the case of several possible reception paths, a different reception path is prepared in a further step 3. This includes, in particular, the intermediate storage of the radio signal received via the other reception path. Furthermore, the ongoing checking of the quality of the reception path based on the criterion parameters according to step 1 is continued. If the value of the criterion parameter of the selected reception path is below the value of the second threshold, after step 2 in step 4 a switch to the other reception path is checked and, if necessary, carried out. In any case, after checking or switching, the ongoing checking of the reception quality of all reception paths is continued according to step 1.
  • digital and analog (FM) radio and internet radio are available as reception channels.
  • the radio signal received via digital radio is broadcast immediately.
  • the quality of all three reception paths is then continuously checked using the criterion parameters. If the criterion parameter of the digital broadcasting falls below the first threshold value, according to step 3, for example, a switch to Internet radio is prepared by means of intermediate storage.
  • a switch is checked in accordance with step 4. If, for example, according to the criterion parameters, the analog radio signal is to be preferred over the Internet radio, it may be possible to switch to the analog radio signal.
  • step 2 If the criterion parameter of the analog broadcast signal exceeds the first threshold value, the buffering is stopped in accordance with step 2. If the analog FM signal should now deteriorate, depending on the criterion parameter according to In step 3, a change is prepared again, that is to say, for example, an intermediate storage of the signal that can be received via the Internet radio is initiated. If, in the event of a further deterioration in the analog signal, a switch is checked in accordance with step 4 and, for example, Internet radio is the preferred reception path, the temporarily stored content is used and the switch to Internet radio takes place for the user without a perceptible pause in the acoustic transmission of the radio signal .
  • the user would first have to wait until the information received via the Internet radio is sufficient and can therefore also be transmitted acoustically. For example, after a connection to the Internet radio provider has been established, depending on the available transmission rate, it can take up to 30 seconds before the acoustic transmission of a radio signal received via the Internet, i.e. an activation of an audio signal that can be received via the Internet, can begin. During this time, the acoustic transmission of the radio signal would be interrupted.
  • Fig. 2 an exemplary time course of two different criterion parameters is shown in the same situation.
  • the two criterion parameters here are, for example, the intensity I of an FM radio signal and an averaged intensity ⁇ I>, which is derived from the intensity I.
  • Both intensities I, ⁇ I> are plotted over time t.
  • the threshold values S1, S2 associated with the first and second thresholds are also shown.
  • the threshold value S1 is greater than the threshold value S2 here. At the times before t1, the two criterion parameters are initially still above the threshold value S1.
  • the first criterion parameter that is to say the intensity I
  • a switchover is therefore prepared between times t1 and t2. Since Internet radio is the alternative reception method, in this example a good reception quality is assumed for Internet radio, and consequently for a If future switching is possible, the audio signal received via the Internet radio is temporarily stored.
  • a switch back to the analog radio as the reception path can take place.
  • the user can then, for example, jump back to the audio content currently being played back in analog FM broadcasting via a button, a "live" switch, which is ahead of time compared to Internet radio.
  • Fig. 3 Another exemplary course of two criterion parameters is shown.
  • analog radio reception via FM is not desired here, so that digital radio and Internet radio are available as reception channels with DAB, for example.
  • the intensity I for example that of the digital DAB radio signal or the corresponding averaged intensity ⁇ I>, is selected as the y-axis and the time t as the x-axis.
  • the two threshold values S1 and S2 are also shown. Initially, that is to say at times before t1, intensity I and averaged intensity ⁇ I> are still above threshold value S1, but this changes at time t1 and t A , respectively.
  • the intensity I passes through the threshold value S2 several times at the points in time t2, t3, t4 and t5, which follow one another in rapid succession. This can result in switching between different reception paths several times in quick succession, the so-called "ping-pong effect", which, however, is very annoying for the user.
  • the averaged intensity ⁇ I> is used as the criterion parameter, this is avoided from the outset in the present example, since the averaged intensity ⁇ I> does not follow the short-term fluctuations in the intensity I and so the second threshold value S2 is not crossed corresponding to the times t2, t3, t4 and t5.
  • a selection of the intensity I as a criterion parameter may have already led to multiple switching back and forth between, in the present case, DAB and the Internet radio. This is avoided, for example, by choosing the averaged intensity ⁇ I> as the criterion parameter.
  • the intensity I rises again, it even rises briefly, between the immediately successive points in time t6 and t7, to a value above the first threshold value S1.
  • the averaged intensity value ⁇ I> follows this sudden increase only with a delay and does not exceed the first threshold value S1.
  • the selection of the intensity I as the criterion parameter leads to an interruption or stopping of the intermediate storage at the point in time t6 because the threshold value S1 is exceeded.
  • the interruption of the temporary storage can have unfavorable consequences - for example if between the two points in time t7 and t8 not enough time has passed to completely fill the buffer again.
  • sufficient information in the buffer memory cannot be accessed, so that the user may have to accept an interruption in the broadcast radio signal when switching, for a period that is, for example, due to another technically necessary Caching is conditional.
  • the buffering of the signals from the Internet radio is not interrupted at t6.
  • the averaged intensity ⁇ I> drops at time t B , which corresponds to the drop in intensity I at time t8
  • no new intermediate storage is required, i.e. the user is immediately out of the Internet radio via the temporarily stored radio signal with information without an audible pause provided.
  • the DAB signal is available again at a later point in time with sufficient intensity I, a switch back from the Internet radio to DAB reception may be desired, possibly for cost reasons.
  • the DAB radio signal is generally ahead of the Internet radio signal so that information can be skipped when switching from Internet radio to DAB as the reception path.
  • the DAB radio signal can also be temporarily stored and possibly an inaudible switch from Internet radio to DAB as a reception path for the same radio signal, for example, using a correlation method.
  • the audio signal received via DAB identical to the one previously received via Internet radio, is acoustically broadcast with a delay.

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  • Circuits Of Receivers In General (AREA)

Description

Die Erfindung betrifft ein Verfahren zum akustischen Ausstrahlen von Hörfunksignalen in einem Fahrzeug, bei welchem Hörfunksignale über einen ersten und über zumindest einen zweiten Empfangsweg ins Fahrzeug übertragen und dort empfangen werden können, wobei der erste Empfangsweg anhand eines über ihn empfangbaren Hörfunksignals durch zumindest einen Kriteriumparameter bewertet wird, und der zweite Empfangsweg ebenfalls anhand des über ihn empfangbaren Hörfunksignals durch einen Kriteriumparameter bewertet wird.The invention relates to a method for acoustically broadcasting radio signals in a vehicle, in which radio signals can be transmitted into the vehicle via a first and at least one second receiving path and received there, the first receiving path being evaluated by at least one criterion parameter based on a radio signal that can be received via it is, and the second reception path is also evaluated by a criterion parameter on the basis of the radio signal that can be received via it.

Radioprogramme werden im Fahrzeug traditionell und hauptsächlich über den analogen Rundfunkempfang mittels AM (Amplitudenmodulation) oder FM (Frequenzmodulation) im Fahrzeug konsumiert. Der digitale Rundfunkempfang von Radioprogrammen, beispielsweise in Form von DAB (Digital Audio Broadcast), steht seit mehreren Jahren als weiterer Empfangsweg zur Verfügung. Eine Neuerung für entsprechend ausgerüstete Fahrzeuge ist der Radioempfang aus dem Internet über den Mobilfunkkanal, also Internetradio als weiteren Empfangsweg. Das Internetradio nutzt also keine physikalischen Rundfunksender, die stationär errichtet werden müssen. Alle Empfangswege haben aus Nutzersicht unterschiedliche Vor- und Nachteile hinsichtlich Audio-Qualität, Latenz zum Ursprungssignal, Empfangsreichweite und Kosten, was ein Umschalten zwischen unterschiedlichen Empfangswegen für den Nutzer attraktiv macht.Radio programs are traditionally consumed in the vehicle and mainly via analog radio reception using AM (amplitude modulation) or FM (frequency modulation) in the vehicle. The digital radio reception of radio programs, for example in the form of DAB (Digital Audio Broadcast), has been available as a further reception method for several years. An innovation for appropriately equipped vehicles is radio reception from the Internet via the mobile radio channel, i.e. Internet radio as an additional reception channel. The internet radio does not use any physical radio transmitters that have to be set up stationary. From the user's point of view, all reception paths have different advantages and disadvantages in terms of audio quality, latency to the original signal, reception range and costs, which makes switching between different reception paths attractive for the user.

Beim Umschalten des akustischen Ausstrahlens eines Hörfunksignals von einem Empfangsweg, beispielsweise dem analogen Rundfunkempfang, zu einem anderen Empfangsweg, beispielsweise digitalem Rundfunkempfang oder Internetradio, kommt es zu Störungen. Dies ist darauf zurückzuführen, dass die Hörfunksignale auf den unterschiedlichen Empfangswegen in der Regel aus technischen Gründen nicht synchronisiert im Fahrzeug empfangen werden.When switching the acoustic transmission of a radio signal from one reception path, for example analog radio reception, to another reception path, for example digital radio reception or Internet radio, interference occurs. This is due to the fact that the radio signals on the different reception paths are usually not received in a synchronized manner in the vehicle for technical reasons.

In der Druckschrift DE 10 2005 041 653 A1 ist ein Verfahren für ein von einem Nutzer weniger wahrnehmbares Umschalten zwischen analogem und digitalem Rundfunkempfang beschrieben. Eine Synchronisation der beiden Funksignale über ein Korrelationsverfahren ermöglicht hier ein Umschalten zwischen den Empfangswegen, ohne dass für den Nutzer eine Lücke oder eine Wiederholung im Hörfunksignal wahrzunehmen ist.In the pamphlet DE 10 2005 041 653 A1 describes a method for switching between analog and digital radio reception that is less perceptible to a user. A synchronization of the two radio signals via a correlation process enables switching between the reception paths without the user perceiving a gap or a repetition in the radio signal.

Die EP 2 244 481 A1 stellt ein mobiles Endgerät bereit, welches einen Speicher, einen Bildschirm sowie eine drahtlos-Kommunikationseinheit aufweist. Die drahtlos-Kommunikationseinheit hat dabei ein erstes Modul um ein erstes Übertragungssignal zu empfangen und ein zweites Modul um ein zweites Übertragungssignal zu empfangen und eine Kontrolleinheit. Die Kontrolleinheit steuert die drahtlos-Kommunikationseinheit dahingehend, dass, wenn eine Signalstärke des ersten Übertragungssignals einen ersten Schwellwert unterschreitet, durch das zweite Modul das zweite Übertragungssignal empfangen wird und in dem Speicher zwischengespeichert wird, während auf dem Bildschirm Inhalte dargestellt werden, welche dem ersten Übertragungssignal entsprechen.the EP 2 244 481 A1 provides a mobile terminal device which has a memory, a screen and a wireless communication unit. The wireless communication unit has a first module to receive a first transmission signal and a second module to receive a second transmission signal and a control unit. The control unit controls the wireless communication unit in such a way that, if a signal strength of the first transmission signal falls below a first threshold value, the second module receives the second transmission signal and stores it temporarily in the memory, while content is displayed on the screen that corresponds to the first transmission signal correspond.

Die JP H11 196 009 A beschreibt ein Verfahren zum Umschalten zwischen einem DAB- und RDS-Autoradioempfang, bei welchem in regelmäßigen Abständen eine Empfangsqualität mit einem vorgegebenen Grenzwert verglichen wird. Wird der Grenzwert für eine vorgegebene Zeitdauer hin unterschritten, so erfolgt ein Umschalten von dem DAB-Radio zu dem RDS-Radio oder umgekehrt.the JP H11 196 009 A describes a method for switching between DAB and RDS car radio reception, in which a reception quality is compared with a predetermined limit value at regular intervals. If the limit value is undershot for a predetermined period of time, then there is a switchover from the DAB radio to the RDS radio or vice versa.

Die US 2010/0203823 A1 beschreibt eine Methode zum Fortführen einer Wiedergabe eines multimedialen Inhaltes, bei welcher ein Inhalt über eine Rundfunkübermittlung von einer mobilen Einheit empfangen wird. Es wird hier eine Datenverbindung aufgebaut, über welche der gleiche Inhalt wie über die Rundfunkübermittlung abgerufen werden kann. Sobald über die Datenverbindung eine geeignete Quelle für den besagten Inhalt gefunden ist und die Empfangsqualität der Radioübermittlung eine vorgegebene Schwelle unterschreitet, wird der Inhalt von der Datenverbindung empfangen und wiedergegeben.the US 2010/0203823 A1 describes a method for continuing playback of multimedia content in which content is received by a mobile unit via a radio transmission. A data connection is established here, via which the same content can be called up as via the radio transmission. As soon as a suitable source for the said content is found via the data connection and the reception quality of the radio transmission falls below a predetermined threshold, the content is received by the data connection and played back.

Die US 2013/0053058 A1 beschreibt eine Methode bei welcher der Nutzer eine Vorgabe machen kann, wie genau die Übereinstimmung beim Umschalten von einem verzögerungsbehafteten Empfangsweg zu einem verzögerungsfreien Empfangsweg sein soll.the US 2013/0053058 A1 describes a method in which the user can specify how precise the match should be when switching from a delayed reception path to a delay-free reception path.

Aufgabe der vorliegenden Erfindung ist es, die Ausstrahlung von Hörfunksignalen im Fahrzeug bei einem Wechsel eines Empfangswegs nutzerfreundlicher zu gestalten.The object of the present invention is to make the transmission of radio signals in the vehicle more user-friendly when a reception path is changed.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren, durch ein Informationsdarbietungssystem und durch ein Fahrzeug mit den Merkmalen gemäß den jeweiligen unabhängigen Patentansprüchen gelöst.According to the invention, this object is achieved by a method, by an information display system and by a vehicle having the features according to the respective independent claims.

Das erfindungsgemäße Verfahren zum akustischen Ausstrahlen von Hörfunksignalen in einem Fahrzeug beinhaltet die Möglichkeit, Hörfunksignale über einen ersten und über zumindest einen zweiten Empfangsweg bzw. Empfangskanal ins Fahrzeug zu übertragen und dort empfangen zu können. Hierbei wird der erste Empfangsweg anhand eines über ihn empfangbaren Hörfunksignals durch zumindest einen Kriteriumparameter bewertet, und der zweite Empfangsweg wird ebenfalls anhand des über ihn empfangbaren Hörfunksignals durch einen Kriteriumparameter bewertet. Der Kriteriumparameter kann ein einzelner Parameter wie eine Messgröße sein, aber auch ein übergeordneter Parameter, der mehrere einzelne Parameter beinhaltet. Die Bewertung der Hörfunksignale bzw. der Empfangswege erfolgt kontinuierlich und simultan, wobei eine Überprüfung in diskreten Zeitintervallen ebenfalls möglich ist.The method according to the invention for acoustically emitting radio signals in a vehicle includes the possibility of transmitting radio signals into the vehicle via a first and at least one second receiving path or receiving channel and being able to receive them there. Here, the first reception path is evaluated using a radio signal that can be received via it by at least one criterion parameter, and the second reception path is also evaluated using the radio signal that can be received via it by a criterion parameter. The criterion parameter can be a single parameter such as a measured variable, but also a higher-level parameter that contains several individual parameters. The evaluation of the radio signals or the reception paths takes place continuously and simultaneously, with a check in discrete time intervals also being possible.

Die Kriteriumparameter der Empfangswege können identisch sein, also identische Messgrößen und/oder Parameter umfassen. Sie können aber auch voneinander abweichende Messgrößen und/oder Parameter umfassen, und dann, bspw. über eine Vergleichsliste oder einen Algorithmus, ineinander überführt und verglichen werden.The criterion parameters of the reception paths can be identical, that is to say comprise identical measured variables and / or parameters. However, they can also include measured variables and / or parameters that differ from one another, and then, for example, using a comparison list or an algorithm, are converted into one another and compared.

Wesentlich ist hier, dass während einer Ausstrahlung des Hörfunksignals über einen der Empfangswege, den momentanen Empfangsweg, abhängig von einem Vergleich von dem Kriteriumparameter des momentanen Empfangswegs mit einem ersten Schwellwert eine Vorbereitungsphase gestartet wird. Diese Vorbereitungsphase dient zur Vorbereitung eines später gegebenenfalls erfolgenden Umschaltens von dem momentanen Empfangsweg, also dem Empfangsweg, über welchen das derzeit akustisch ausgestrahlte Hörfunksignal empfangen wird, auf den anderen Empfangsweg oder, falls mehrere Empfangswege zur Verfügung stehen, den gemäß der Bewertung durch den Kriteriumparameter besten Empfangsweg. In der Vorbereitungsphase wird ein Vergleich des Kriteriumparameters des momentanen Empfangswegs mit einem im Vergleich zum ersten Schwellwert niedrigeren zweiten Schwellwert durchgeführt und bei einem Unterschreiten des zweiten Schwellwerts ein Überprüfen eines Umschaltens auf den anderen Empfangsweg durchgeführt.It is essential here that while the radio signal is being transmitted via one of the reception paths, the current reception path, a preparation phase is started as a function of a comparison of the criterion parameter of the current reception path with a first threshold value. This preparatory phase is used to prepare for a subsequent switchover from the current reception path, if necessary. that is, the reception path via which the currently acoustically transmitted radio signal is received, to the other reception path or, if several reception paths are available, the best reception path according to the evaluation by the criterion parameter. In the preparation phase, the criterion parameter of the current reception path is compared with a second threshold value, which is lower than the first threshold value, and a switch to the other reception path is checked if the second threshold value is not reached.

Es wird also im Falle eines Absinkens der durch den Kriteriumparameter repräsentierten Güte des momentanen Empfangswegs bzw. der Qualität des ausgestrahlten Hörfunksignals nach einem Vergleich mit dem ersten Schwellwert zunächst ein Umschalten vorbereitet. Im Falle einer weiterhin schlechter werdenden Qualität des ausgestrahlten Hörfunksignals, welches über ein Unterschreiten des zweiten Schwellwerts durch den Kriteriumparameter erkannt wird, wird ein Umschalten auf einen anderen Empfangsweg geprüft. Vorteil ist hier, dass in der Vorbereitungsphase explizite Maßnahmen, welche von sowohl dem momentanen Empfangsweg als auch dem oder den möglichen anderen Empfangswegen abhängen, ergriffen werden können, um ein bestmögliches, im Idealfall für den Nutzer nicht bemerkbares Umschalten zwischen verschiedenen Empfangswegen zu ermöglichen.In the event of a decrease in the quality of the current reception path or the quality of the broadcast radio signal represented by the criterion parameter, a switchover is first prepared after a comparison with the first threshold value. In the event that the quality of the broadcast radio signal continues to deteriorate, which is recognized by the criterion parameter when the second threshold value is not reached, a switch to another reception path is checked. The advantage here is that explicit measures, which depend on both the current reception path and the other possible reception path (s), can be taken in the preparation phase in order to enable the best possible switchover between different reception paths, ideally not noticeable to the user.

Eine bevorzugte Ausgestaltung des erfindungsgemäßen Verfahrens sieht vor, dass beim Überprüfen des Umschaltens auch der Kriteriumparameter des anderen Empfangswegs mit dem zweiten Schwellwert verglichen wird, und auf den anderen Empfangsweg umgeschaltet wird, falls dieser Kriteriumparameter den zweiten Schwellwert nicht unterschreitet oder ein Unterschreiten geringer ist, als das Unterschreiten des Kriteriumparameters des momentanen Empfangsweges. Das hat den Vorteil, dass gewährleistet ist, dass ein Umschalten auf einen anderen Empfangsweg nur erfolgt, falls dieser bzw. das über ihn empfangene Hörfunksignal eine bessere Qualität aufweist, als das über den momentanen Empfangsweg empfangene Hörfunksignal.A preferred embodiment of the method according to the invention provides that when checking the switchover, the criterion parameter of the other reception path is also compared with the second threshold value, and a switch is made to the other reception path if this criterion parameter does not fall below the second threshold value or if it falls below this value less than falling below the criterion parameter of the current reception path. This has the advantage that it is ensured that a switchover to another reception path only takes place if this or the radio signal received via it has a better quality than the radio signal received via the current reception path.

Eine vorteilhafte Ausführungsform des erfindungsgemäßen Verfahrens sieht vor, dass das während der Vorbereitungsphase über den anderen Empfangsweg empfangene, nach einem möglicherweise noch zu erfolgenden Umschalten auf den anderen Empfangsweg auszustrahlende Hörfunksignal zwischengespeichert wird. Das hat den besonderen Vorteil, dass das Umschalten in Folge für den Nutzer besonders angenehmen, zum Beispiel lückenlos, gestaltet werden kann, und beispielsweise auch über ein Korrelationsverfahren ein unhörbares Umschalten realisiert werden kann. Eine lückenlose Informationsübermittlung ist dadurch erreicht. Der bevorzugte Umfang des Zwischenspeicherns, also insbesondere die Menge der zwischengespeicherten Information, ist hierbei prinzipiell in Abhängigkeit von aktuellen Umgebungsbedingungen wie bspw. der örtlichen Position des Fahrzeugs, Witterungsbedingungen oder lokalen Empfangsbedingungen zu wählen.An advantageous embodiment of the method according to the invention provides that the radio signal received during the preparation phase via the other reception path and to be transmitted after a switch to the other reception path that may still have to take place is buffered. This has the particular advantage that the sequential switching can be designed to be particularly pleasant for the user, for example without any gaps, and, for example, inaudible switching can also be implemented using a correlation method. A complete transfer of information is thereby achieved. The preferred scope of the temporary storage, in particular the amount of temporarily stored information, is to be selected in principle as a function of current environmental conditions such as the local position of the vehicle, weather conditions or local reception conditions.

Insbesondere ist vorgesehen, dass das Zwischenspeichern nur dann gestartet wird, wenn als der andere Empfangsweg ein derartiger vorgesehen wird, bei dem eine Informationsdarbietung der in dem Hörfunksignal enthaltenen Informationen um ein Versatzzeitintervall zeitlich versetzt - also verzögert oder auch zeitlich voraus - zu der Informationsdarbietung über den momentanen Empfangsweg durchgeführt wird. Das hat den Vorteil, dass technisch bedingte Verzögerungen bei dem Umschalten für den Nutzer unhörbar oder schwer wahrnehmbar gemacht werden können. Insbesondere können so beim Umschalten Pausen überbrückt oder ein Überspringen von Informationen vermieden werden.In particular, it is provided that the buffering is only started if the other receiving path is one in which an information presentation of the information contained in the radio signal is offset in time by an offset time interval - that is, delayed or also in advance of the information presentation via the current reception path is carried out. This has the advantage that technical delays in switching can be made inaudible or difficult to perceive for the user. In particular, pauses can be bridged when switching over or information cannot be skipped over.

Bevorzugt ist es, dass das Zwischenspeichern gestartet wird, wenn zumindest einer der für die zukünftige akustische Ausstrahlung bzw. Darbietung des Hörfunksignals in Frage kommenden anderen Empfangswege ein Empfangsweg ist, bei dem die Hörfunksignale über einen Mobilfunkkanal übertragen werden. Insbesondere also, wenn das Internetradio ein möglicher Empfangsweg für die Ausstrahlung des Hörfunksignals ist. Das hat den Vorteil, dass gerade die bei einem Mobilfunkkanal auftretenden Verzögerungen aufgrund von zwischengeschalteten Providern sowie Schwankungen in der Übertragungsrate insbesondere unmittelbar nach einem Verbindungsaufbau und insbesondere auch ein variabler, aber vom Internetradioanbieter vorgegebener zeitlicher Versatz durch ein Zwischenspeichern ausgeglichen werden können. Beispielsweise kann es nach einem Verbindungsaufbau zum Internetradioanbieter in Abhängigkeit von der verfügbaren Übertragungsrate bis zu 30 Sekunden dauern, bis die akustische Ausstrahlung eines über das Internet empfangenen Hörfunksignals, also eine Aufschaltung eines über das Internet empfangbaren Ausiosignals, beginnen kann. Diese Pause wäre ohne ein vorbereitendes Zwischenspeichern für den Nutzer als Stille wahrnehmbar und sehr störend.It is preferred that the buffering is started when at least one of the other reception paths that may be considered for the future acoustic transmission or presentation of the radio signal is a reception path in which the radio signals are transmitted via a mobile radio channel. In particular, if the Internet radio is a possible reception path for broadcasting the radio signal. This has the advantage that the delays occurring in a mobile radio channel due to intermediary providers and fluctuations in the Transmission rate, in particular immediately after a connection has been established, and in particular also a variable, but predetermined time offset by the Internet radio provider, can be compensated for by buffering. For example, after a connection to the Internet radio provider has been established, depending on the available transmission rate, it can take up to 30 seconds before the acoustic transmission of a radio signal received via the Internet, i.e. an activation of an audio signal that can be received via the Internet, can begin. Without a preliminary buffering, this pause would be perceptible to the user as silence and very annoying.

Hier kann insbesondere vorgesehen sein, das Zwischenspeichern zu starten, wenn das Umschalten von einem rundfunkbasierten Empfangsweg auf das Internetradio geprüft werden kann oder soll. Das hat den Vorteil, dass der besonders auffallende zeitliche Versatz zwischen einem rundfunkbasierten Empfangsweg, insbesondere einem verzögerungsfreien Empfangsweg wie FM oder AM, auf das im Vergleich stark, bspw. bis zu dreißig Sekunden oder sogar darüber hinaus, verzögerte Internetradio ausgeglichen werden kann und resultierende Pausen in der Ausstrahlung des Hörfunksignals vermieden werden.Provision can in particular be made here to start the buffering when the switchover from a radio-based reception path to the Internet radio can or should be checked. This has the advantage that the particularly noticeable time offset between a radio-based reception path, in particular a delay-free reception path such as FM or AM, can be compensated for with Internet radio that is significantly delayed, for example up to thirty seconds or even more, and the resulting pauses be avoided in the transmission of the radio signal.

Eine bevorzugte Ausführungsform des erfindungsgemäßen Verfahrens sieht vor, dass die Vorbereitungsphase, insbesondere das Zwischenspeichern, beendet wird, wenn ein tatsächliches Umschalten auf den anderen Empfangsweg durchgeführt wird und/oder der erste Schwellwert durch die Kriterienparameterwerte zumindest für ein vorgebbares Überschreitungszeitintervall wieder zu höheren Werten hin überschritten wird. Das hat den Vorteil, dass unnötiges Zwischenspeichern vermieden wird. Das ist beispielsweise der Fall, falls auf einen Empfangsweg umgeschaltet wurde, der ein Zwischenspeichern nicht erfordert oder wenn auf Grund einer Verbesserung der Qualität des über den momentanen Empfangsweg empfangene Hörfunksignal ein künftiges Umschalten nicht mehr in Frage kommt, so dass ein Zwischenspeichern nicht mehr notwendig ist. Das vorgebbare Überschreitungszeitintervall stellt hier sicher, dass eine kurzzeitige Verbesserung der Qualität des momentanen Empfangsweges nicht zu einem Löschen des Zwischenspeichers, der möglicherweise kurz später benötigt wird, führt. Vorteilhafterweise ist also das vorgebbare Überschreitungszeitintervall so vorgegeben, dass kurze Verbesserungen der Güte des momentanen Empfangsweges, also insbesondere sprunghafte, deltapeakartige Vebesserungen der Qualität nicht zu einem Beenden des Zwischenspeicherns führen. Ein solches vorgebbares Überschreitungszeitintervall kann beispielsweise zwei Sekunden betragen. Grundsätzlich kann die Dauer des Überschreitungszeitintervalls in Abhängigkeit von wechselnden Umgebungsbedingungen dynamisch bestimmt bzw. verändert oder zuvor fest vorgegeben werden.A preferred embodiment of the method according to the invention provides that the preparation phase, in particular the temporary storage, is ended when an actual switchover to the other reception path is carried out and / or the first threshold value is exceeded again towards higher values by the criteria parameter values at least for a predeterminable time interval that is exceeded will. This has the advantage that unnecessary caching is avoided. This is the case, for example, if a switch was made to a reception path that does not require intermediate storage or if future switching is no longer an option due to an improvement in the quality of the radio signal received via the current reception path, so that intermediate storage is no longer necessary . The predeterminable exceedance time interval ensures that there is a short-term improvement in quality the current reception path does not lead to a deletion of the buffer, which may be required shortly afterwards. Advantageously, the predeterminable exceedance time interval is specified in such a way that short improvements in the quality of the current reception path, that is to say in particular sudden, delta-peak-like improvements in quality, do not lead to the caching being terminated. Such a predeterminable exceeding time interval can be, for example, two seconds. In principle, the duration of the exceeding time interval can be dynamically determined or changed as a function of changing environmental conditions, or it can be predetermined in advance.

Eine weitere Ausführungsform des erfindungsgemäßen Verfahrens sieht vor, dass ein Umschalten von dem momentanen Empfangsweg auf den anderen Empfangsweg abhängig davon erfolgt, ob der zweite Schwellwert für zumindest ein vorgebbares Unterschreitungszeitintervall durch die Kriteriumparameterwerte unterschritten wird. Das hat den Vorteil, dass kurze deltapeakartige Verschlechterungen der Qualität des über den momentanen Empfangsweg empfangenen Hörfunksignals nicht zu einem Umschalten zu dem anderen, möglicherweise im weiteren Zeitverlauf unvorteilhaften, Empfangsweg führen. Über die geeignete Wahl des vorgebbaren Unterschreitungszeitintervalls wird ein häufiges Hin- und Herschalten zwischen verschiedenen Empfangswegen innerhalb sehr kurzer Zeit, der sogenannte Ping-Pong-Effekt, vermieden. Ein beispielhafter Wert für das vorgebbare Unterschreitungszeitintervall sind hier zwei Sekunden. Grundsätzlich kann die Dauer des Unterschreitungszeitintervalls in Abhängigkeit von wechselnden Umgebungsbedingungen dynamisch bestimmt bzw. verändert oder zuvor fest vorgegeben werden.A further embodiment of the method according to the invention provides that a switchover from the current reception path to the other reception path takes place depending on whether the criterion parameter values fall below the second threshold value for at least one predeterminable time interval below the threshold. This has the advantage that brief delta-peak-like deteriorations in the quality of the radio signal received via the current reception path do not lead to a switch to the other reception path, which may be disadvantageous in the further course of time. By appropriately selecting the predeterminable undershoot time interval, frequent switching back and forth between different reception paths within a very short time, the so-called ping-pong effect, is avoided. An exemplary value for the predefinable undershoot time interval is two seconds. In principle, the duration of the undershoot time interval can be dynamically determined or changed as a function of changing environmental conditions, or it can be predefined in advance.

Insbesondere ist vorgesehen, dass als Kriteriumparameter der unterschiedlichen Empfangswege die jeweilige Empfangfeldstärke und/oder das jeweilige Signal-Rausch-Verhältnis (SNR) und/oder die jeweilige Bitfehlerrate (BER) und/oder die verfügbare Datenrate im verwendeten Mobilfunknetz und/oder der Funknetztyp und/oder eventuell erforderliches Roaming und/oder die Decoder Audio Quality (Service) und/oder der Fast Information Channel (FIC) und/oder der Received Signal Strength Indicator (RSSI) und/oder eine vorliegende Stereo/Mono Umschaltung und/oder ein Kostenfaktor, welcher bspw. Energieverbrauch und/oder Ressourcennutzung und/oder monetäre Kosten im Zusammenhang mit dem Empfangsweg abbildet, verwendet wird. Der Vorteil ist hier, dass die Qualität der Empfangswege direkt und unmittelbar, also sehr schnell, im Kriteriumparameter abgebildet wird.In particular, it is provided that the respective received field strength and / or the respective signal-to-noise ratio (SNR) and / or the respective bit error rate (BER) and / or the available data rate in the mobile network used and / or the radio network type and / or possibly required roaming and / or the decoder audio quality (service) and / or the fast information channel (FIC) and / or the Received Signal Strength Indicator (RSSI) and / or an existing stereo / mono switch and / or a cost factor, which, for example, depicts energy consumption and / or resource use and / or monetary costs in connection with the reception path, is used. The advantage here is that the quality of the reception paths is mapped directly and immediately, i.e. very quickly, in the criterion parameter.

Weiterhin kann der Kriteriumparameter der unterschiedlichen Empfangswege über signalverarbeitende Schritte und/oder andere mathematische Methoden bzw. Berechnungen - beispielsweise über eine Mittelung, eine gewichteten Integration, oder eine Faltung mit einem Kern - als Größe aus der jeweiligen Empfangsfeldstärke und/oder im jeweiligen Signal-Rausch-Verhältnis (SNR) und/oder der jeweiligen Bitfehlerrate (BER) und/oder der verfügbaren Datenrate im verwendeten Mobilfunknetz und/oder dem Funknetztyp und/oder eventuell erforderlichem Roaming und/oder der Decoder Audio Quality (Service) und/oder dem Fast Information Channel (FIC) und/oder dem Received Signal Strength Indicator (RSSI) und/oder einer vorliegenden Stereo/Mono Umschaltung und/oder eines Kostenfaktors, welcher bspw. Energieverbrauch und/oder Ressourcennutzung und/oder monetäre Kosten im Zusammenhang mit dem Empfangsweg abbildet, aufbereitet werden, und zwar derart, dass der zeitliche Verlauf der einzelnen aufgeführten Größen berücksichtigt und insbesondere einzelne kurzzeitige oder unmittelbar nach einem Umschalten erfolgende Über- bzw. Unterschreitungen der beiden Schwellwerte durch den Kriteriumparameter verhindert werden. Das hat den Vorteil, dass die Qualität eines Empfangsweges nicht nur auf Basis eines einzelnen Messwerts beurteilt wird. Es lässt sich ferner eine Hysterese, also eine Mitberücksichtigung des bisherigen zeitlichen Verlaufs der aufgeführten Größen auf das augenblickliche Vorgehen im Verfahren realisieren. Eine Folge ist, dass der bereits erwähnte Ping-Pong-Effekt so verhindert werden kann.Furthermore, the criterion parameter of the different reception paths can be made using signal processing steps and / or other mathematical methods or calculations - for example using averaging, weighted integration, or convolution with a core - as a variable from the respective reception field strength and / or in the respective signal-to-noise Ratio (SNR) and / or the respective bit error rate (BER) and / or the available data rate in the cellular network used and / or the type of radio network and / or any required roaming and / or the decoder audio quality (service) and / or the fast information Channel (FIC) and / or the Received Signal Strength Indicator (RSSI) and / or an existing stereo / mono switch and / or a cost factor, which, for example, depicts energy consumption and / or resource use and / or monetary costs in connection with the reception path, processed in such a way that the temporal course of the individual listed variables over be considered and in particular individual short-term or immediately after a switchover occurring overshoots or undershoots of the two threshold values are prevented by the criterion parameter. This has the advantage that the quality of a reception path is not only assessed on the basis of a single measured value. A hysteresis can also be implemented, that is to say taking into account the previous temporal course of the listed variables on the current procedure in the method. One consequence is that the already mentioned ping-pong effect can be prevented in this way.

Es ist auch vorgesehen, dass der Kriteriumparameter der unterschiedlichen Empfangswege als Größe derart aufbereitet wird, dass zu erwartende Veränderungen der jeweiligen Empfangsfeldstärke und/oder dem jeweiligen Signal-Rausch-Verhältnis (SNR) und/der der jeweiligen Bitfehlerrate (BER) und/oder der verfügbaren Datenrate im verwendeten Mobilfunknetz und/oder des Funknetztyps und/oder eventuell erforderlichen Roamings und/oder der Decoder Audio Quality (Service) und/oder des Fast Information Channels (FIC) und/oder des Received Signal Strength Indicators (RSSI) und/oder einer vorliegenden Stereo/Mono Umschaltung und/oder eines Kostenfaktors, welcher bspw. Energieverbrauch und/oder Ressourcennutzung und/oder monetäre Kosten im Zusammenhang mit dem Empfangsweg abbildet, mit berücksichtigt werden. Das hat den Vorteil, dass im Verfahren so eine Vorbereitung des Umschaltens zwischen unterschiedlichen Empfangswegen aufgrund zu erwartender Veränderungen in der Qualität der unterschiedlichen Empfangswege ermöglicht wird, also ein Prognoseverhalten umgesetzt wird. Insbesondere können hier Informationen aus einer eventuellen Routenplanung berücksichtigt werden.It is also provided that the criterion parameter of the different reception paths is processed as a variable in such a way that expected changes in the respective reception field strength and / or the respective signal-to-noise ratio (SNR) and / of the respective bit error rate (BER) and / or the available data rate in the cellular network used and / or the type of radio network and / or any required roaming and / or the decoder Audio Quality (Service) and / or the Fast Information Channel (FIC) and / or the Received Signal Strength Indicator (RSSI ) and / or an existing stereo / mono switchover and / or a cost factor which, for example, depicts energy consumption and / or resource use and / or monetary costs in connection with the reception path, can also be taken into account. This has the advantage that in the method a preparation for switching between different reception paths is made possible on the basis of expected changes in the quality of the different reception paths, that is to say a prognosis behavior is implemented. In particular, information from a possible route planning can be taken into account here.

Bevorzugt kann das Umschalten zu einem verzögerungsbehafteten Empfangsweg, wie dem Internetradio oder auch Digital Audio Broadcast (DAB) über ein Überblenden oder eine Stillschaltung, ein sog. "Mute", erfolgen. Vorteil ist hier, dass der Nutzer das Umschalten nicht als abrupt und unangenehm empfindet.Switching to a delayed reception path, such as Internet radio or digital audio broadcast (DAB), can preferably take place via fading or a so-called "mute". The advantage here is that the user does not find the switch to be abrupt and uncomfortable.

Es ist vorgesehen, dass das Umschalten von einem verzögerungsbehafteten Empfangsweg wie Internetradio oder DAB zu einem verzögerungsfreien Empfangsweg wie FM oder AM auf zwei unterschiedliche Weisen erfolgen kann: Entweder ohne ein Beibehalten der Verzögerung, also mit einem Überspringen von Information, oder mit einem Beibehalten der Verzögerung, also ohne ein Überspringen von Information - im letzteren Fall dann insbesondere unter Zuhilfenahme eines Korrelationsverfahrens und einem Zwischenspeichern des Hörfunksignals aus dem verzögerungsfreien Empfangsweg. Diese beiden Möglichkeiten erfolgen entweder gemäß einer grundsätzlichen Voreinstellung des Nutzers oder auf eine konkrete Wahl oder Veranlassung des Nutzers hin, die über eine Nutzeroption im Human-Machine-Interface (HMI) eines Steuergerätes oder als Hardwarelösung in Form eines Bedienelements, wie z.B. über einen Knopf oder Taster, erfolgen kann. Vorteil ist, dass sich der Nutzer gemäß seiner Präferenz so bei einem Umschalten entweder "Live" schalten kann, d.h. dass die Information, die der Nutzer empfängt wieder aktuell und verzögerungsfrei ist, oder dass der Nutzer den augenblicklichen Informationsfluss ohne Unterbrechung weiterverfolgen kann, ohne Springen des Informationsflusses.It is provided that switching from a delayed reception path such as Internet radio or DAB to a delay-free reception path such as FM or AM can take place in two different ways: either without maintaining the delay, i.e. with skipping information, or with maintaining the delay , that is without skipping information - in the latter case then in particular with the aid of a correlation method and intermediate storage of the radio signal from the delay-free reception path. These two options take place either in accordance with a basic pre-setting of the user or on a specific choice or prompt by the user, which is made via a user option in the human-machine interface (HMI) of a control device or as a hardware solution in the form of an operating element, such as a button or button. The advantage is that the user can choose a Switching can either switch "live", ie that the information that the user receives is again up-to-date and without delay, or that the user can continue to follow the current flow of information without interruption, without jumping the flow of information.

Von der Erfindung umfasst ist auch ein Informationsdarbietungssystem zum akustischen Ausstrahlen von Hörfunksignalen in einem Fahrzeug, mit zumindest einer Akustikquelle und einer Empfangseinheit zum Empfangen von Hörfunksignalen, welche die Funktion insbesondere des Empfangens, des Auswertens der Signale und des Steuerns eines Umschaltens zwischen den Empfangswegen umfasst. Dabei sind zumindest zwei Empfangswege zum Übertragen von Hörfunksignalen zur Empfangseinheit enthalten, wobei Hörfunksignale über einen ersten und über zumindest einen zweiten Empfangsweg ins Fahrzeug übertragen und dort empfangen werden können, wobei der erste Empfangsweg anhand eines über ihn empfangbaren Hörfunksignals mittels zumindest eines Kriteriumparameters durch die Empfangseinheit in der Güte bewertet wird, und der zweite Empfangsweg wird ebenfalls anhand des über ihn empfangbaren Hörfunksignals mittels eines Kriteriumparameters durch die Empfangseinheit bewertet wird. Wesentlich ist hierbei, dass die Empfangseinheit derart ausgebildet ist, dass während einer Ausstrahlung des Hörfunksignals über einen der Empfangswege, den momentanen Empfangsweg, abhängig von einem Vergleich von dem Kriteriumparameter des momentanen Empfangsweg mit einem ersten Schwellwert eine Vorbereitungsphase zur Vorbereitung eines Umschaltens von dem momentanen, also dem augenblicklich zur Ausstrahlung vorgesehenen, Empfangsweg auf den anderen Empfangsweg, bzw. im Falle von mehreren anderen Empfangswegen auf den gemäß den jeweiligen Kriteriumsparametern besten dieser Empfangswege, gestartet wird, und in der Vorbereitungsphase der Kriteriumparameter des momentanen Empfangsweges mit einem im Vergleich zum ersten Schwellwert niedrigeren zweiten Schwellwert verglichen wird, und bei einem Unterschreiten des zweiten Schwellwerts ein Umschalten auf den anderen Empfangsweg überprüft wird. Die Empfangseinheit ist derart ausgebildet, dass das Umschalten von einem verzögerungsbehafteten zu einem verzögerungsfreien Empfangsweg entweder ohne ein Beibehalten der Verzögerung oder mit einem Beibehalten der Verzögerung erfolgt, indem die Empfangseinheit ausgebildet ist, dass diese beiden Möglichkeiten entweder gemäß einer grundsätzlichen Voreinstellung des Nutzers oder auf eine konkrete Wahl oder Veranlassung des Nutzers hin erfolgen, die über eine Nutzeroption in einem Human-Machine-Interface (HMI) eines Steuergerätes oder als Hardwarelösung in Form eines Bedienelements erfolgen.The invention also includes an information presentation system for the acoustic transmission of radio signals in a vehicle, with at least one acoustic source and a receiving unit for receiving radio signals, which includes the function in particular of receiving, evaluating the signals and controlling switching between the reception paths. This includes at least two reception paths for transmitting radio signals to the receiving unit, with radio signals being transmitted into the vehicle and received there via a first and at least one second receiving path, the first receiving path being based on a radio signal that can be received via it by means of at least one criterion parameter by the receiving unit is assessed in terms of quality, and the second reception path is also assessed by the receiving unit on the basis of the radio signal that can be received via it by means of a criterion parameter. It is essential here that the receiving unit is designed in such a way that, during a broadcast of the radio signal via one of the receiving paths, the current receiving path, depending on a comparison of the criterion parameter of the current receiving path with a first threshold value, a preparatory phase to prepare for a switchover from the current receiving path. That is, the reception path currently intended for transmission is started on the other reception path, or in the case of several other reception paths on the best of these reception paths according to the respective criterion parameters, and in the preparation phase the criterion parameter of the current reception path with a threshold value compared to the first The lower second threshold value is compared, and if the value falls below the second threshold value, a switch to the other reception path is checked. The receiving unit is designed in such a way that the switchover from a delayed to a non-delayed receiving path takes place either without maintaining the delay or with maintaining the delay, in that the receiving unit is designed so that these two possibilities either according to a basic pre-setting of the user or to a concrete choice or prompting of the user to take place, which are about a user option in a human-machine interface (HMI) of a control device or as a hardware solution in the form of a control element.

Die Erfindung umfasst auch ein Fahrzeug mit einem solchen oben beschriebenen Informationsdarbietungssystem oder einer vorteilhaften Ausführungsform davon.The invention also comprises a vehicle with such an information presentation system as described above or an advantageous embodiment thereof.

Weitere Merkmale der Erfindung ergeben sich aus den Ansprüchen, den Figuren und der Figurenbeschreibung. Alle vorstehend in der Beschreibung genannten Merkmale und Merkmalskombinationen sowie die nachfolgend in der Figurenbeschreibung genannten und/oder in den Figuren alleine gezeigten Merkmale und Merkmalskombinationen sind nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder aber in Alleinstellung verwendbar. Es sind somit auch Ausführungen von der Erfindung als umfasst und offenbart anzusehen, die in den Figuren nicht explizit gezeigt und erläutert sind, jedoch durch separierte Merkmalskombinationen aus den erläuterten Ausführungen hervorgehen und erzeugbar sind.Further features of the invention emerge from the claims, the figures and the description of the figures. All of the features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination, but also in other combinations or on their own. There are thus also embodiments of the invention to be considered as encompassed and disclosed, which are not explicitly shown and explained in the figures, but emerge and can be generated from the explained embodiments by means of separate combinations of features.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand schematischer Zeichnungen näher erläutert. Es zeigen:

Fig. 1
eine Flussdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens;
Fig. 2
einen beispielhaften zeitlichen Verlauf zweier Kriteriumparameter; und
Fig. 3
einen beispielhaften Verlauf zweier weiterer Kriteriumparameter.
Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:
Fig. 1
a flowchart of an embodiment of a method according to the invention;
Fig. 2
an exemplary time course of two criterion parameters; and
Fig. 3
an exemplary course of two further criterion parameters.

In Fig. 1 ist ein Flussdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens gezeigt. Ein erster Schritt 1 umfasst hier ein kontinuierliches und gleichzeitiges laufendes Überprüfen der Empfangsqualität der zur Verfügung stehenden Empfangswege, d.h. ein Überprüfen der Kriteriumparameter aller Empfangswege. In einem zweiten Schritt 2 wird der Kriteriumparameter des gewählten, also momentan zum Ausstrahlen verwendeten, Empfangsweges mit der vorbestimmten ersten und zweiten Schwelle verglichen. Liegt der Wert des Kriteriumparameters über dem ersten Wert der ersten Schwelle, wird keine weitere Aktion durchgeführt, sondern lediglich das laufende Überprüfen der Empfangsqualität gemäß Schritt 1 fortgeführt. Liegt der Wert des Kriteriumparameters zwischen den Werten der ersten und zweiten Schwelle, wird in einem weiteren Schritt 3 ein Wechsel auf den oder, bei mehreren möglichen Empfangswegen, einen anderen Empfangsweg vorbereitet. Hierin enthalten ist insbesondere ein Zwischenspeichern des über den anderen Empfangsweg empfangenen Hörfunksignals. Des Weiteren wird das laufende Überprüfen der Qualität des Empfangswegs anhand der Kriteriumparameter gemäß Schritt 1 fortgeführt. Liegt der Wert des Kriteriumparameters des gewählten Empfangsweges unter dem Wert der zweiten Schwelle, so wird nach Schritt 2 in einem Schritt 4 ein Umschalten auf den anderen Empfangsweg überprüft und gegebenenfalls durchgeführt. In jedem Fall wird nach dem Überprüfen bzw. Umschalten mit dem laufenden Überprüfen der Empfangsqualität aller Empfangswege gemäß Schritt 1 fortgefahren.In Fig. 1 a flowchart of an embodiment of a method according to the invention is shown. A first step 1 here comprises a continuous and simultaneous ongoing checking of the reception quality of the available reception paths, ie a checking of the criterion parameters of all reception paths. In a second step 2, the criterion parameter of the selected, i.e. currently used for broadcasting, is Received path compared with the predetermined first and second threshold. If the value of the criterion parameter is above the first value of the first threshold, no further action is carried out, but rather the ongoing checking of the reception quality according to step 1 is continued. If the value of the criterion parameter lies between the values of the first and second thresholds, a change to the one or, in the case of several possible reception paths, a different reception path is prepared in a further step 3. This includes, in particular, the intermediate storage of the radio signal received via the other reception path. Furthermore, the ongoing checking of the quality of the reception path based on the criterion parameters according to step 1 is continued. If the value of the criterion parameter of the selected reception path is below the value of the second threshold, after step 2 in step 4 a switch to the other reception path is checked and, if necessary, carried out. In any case, after checking or switching, the ongoing checking of the reception quality of all reception paths is continued according to step 1.

Es seien beispielweise digitaler und analoger (FM) Rundfunk sowie Internetradio als Empfangswege verfügbar. Augenblicklich wird das über digitalen Rundfunk empfangene Hörfunksignal ausgestrahlt. Gemäß Schritt 1 wird dann die Qualität aller drei Empfangswege anhand der Kriteriumparameter fortlaufend überprüft. Unterschreitet der Kriteriumparameter des digitalen Rundfunks den ersten Schwellwert, wird gemäß Schritt 3 beispielsweise ein Umschalten auf das Internetradio durch ein Zwischenspeichern vorbereitet. Bei einer weiteren Verschlechterung des Empfangs über den digitalen Rundfunk, einem Absinken des entsprechenden Kriteriumparameters unter den zweiten Schwellwert, wird gemäß Schritt 4 ein Umschalten überprüft. Ist nun zum Beispiel gemäß den Kriteriumparametern das analoge Rundfunksignal gegenüber dem Internetradio zu bevorzugen, wird möglicherweise auf das analoge Rundfunksignal umgeschaltet. Falls der Kriteriumparameter des analogen Rundfunksignals den ersten Schwellwert übertrifft, wird das Zwischenspeichern gemäß Schritt 2 gestoppt. Sollte sich nun das analoge FM-Signal verschlechtern, kann in Abhängigkeit des Kriteriumparameters gemäß Schritt 3 erneut ein Wechsel vorbereitet, d.h. zum Beispiel ein Zwischenspeichern des über das Internetradio empfangbaren Signals eingeleitet werden. Wird nun bei einer weiteren Verschlechterung des analogen Signals gemäß Schritt 4 ein Umschalten überprüft und ist beispielsweise das Internetradio der zu bevorzugende Empfangsweg, so wird auf die zwischengespeicherten Inhalte zurückgegriffen und das Umschalten auf Internetradio erfolgt für den Nutzer ohne eine wahrnehmbare Pause des akustischen Ausstrahlens des Hörfunksignals. Ohne ein vorbereitendes Zwischenspeichern müsste der Nutzer erst warten, bis die über das Internetradio empfangene Information ausreichend und somit auch akustisch ausstrahlbar ist. Beispielsweise kann es nach einem Verbindungsaufbau zum Internetradioanbieter in Abhängigkeit von der verfügbaren Übertragungsrate bis zu 30 Sekunden dauern, bis die akustische Ausstrahlung eines über das Internet empfangenen Hörfunksignals, also eine Aufschaltung eines über das Internet empfangbaren Ausiosignals, beginnen kann. In dieser Zeit wäre das akustische Ausstrahlen des Hörfunksignals unterbrochen.For example, digital and analog (FM) radio and internet radio are available as reception channels. The radio signal received via digital radio is broadcast immediately. According to step 1, the quality of all three reception paths is then continuously checked using the criterion parameters. If the criterion parameter of the digital broadcasting falls below the first threshold value, according to step 3, for example, a switch to Internet radio is prepared by means of intermediate storage. In the event of a further deterioration in reception via digital broadcasting, if the corresponding criterion parameter falls below the second threshold value, a switch is checked in accordance with step 4. If, for example, according to the criterion parameters, the analog radio signal is to be preferred over the Internet radio, it may be possible to switch to the analog radio signal. If the criterion parameter of the analog broadcast signal exceeds the first threshold value, the buffering is stopped in accordance with step 2. If the analog FM signal should now deteriorate, depending on the criterion parameter according to In step 3, a change is prepared again, that is to say, for example, an intermediate storage of the signal that can be received via the Internet radio is initiated. If, in the event of a further deterioration in the analog signal, a switch is checked in accordance with step 4 and, for example, Internet radio is the preferred reception path, the temporarily stored content is used and the switch to Internet radio takes place for the user without a perceptible pause in the acoustic transmission of the radio signal . Without a preparatory intermediate storage, the user would first have to wait until the information received via the Internet radio is sufficient and can therefore also be transmitted acoustically. For example, after a connection to the Internet radio provider has been established, depending on the available transmission rate, it can take up to 30 seconds before the acoustic transmission of a radio signal received via the Internet, i.e. an activation of an audio signal that can be received via the Internet, can begin. During this time, the acoustic transmission of the radio signal would be interrupted.

In Fig. 2 ist ein beispielhafter zeitlicher Verlauf zweier unterschiedlicher Kriteriumparameter in derselben Situation gezeigt. Die beiden Kriteriumparameter sind hier beispielsweise die Intensität I eines FM-Rundfunksignals und eine gemittelte Intensität <I>, die sich aus der Intensität I ableitet. Bei Verschlechterung des FM-Rundfunksignals kommt im vorliegenden Beispiel ein Umschalten auf Internetradio in Frage, ein digitaler Rundfunkempfang ist nicht möglich. Beide Intensitäten I, <I> sind über der Zeit t aufgetragen. Eingezeichnet sind ferner die zu der ersten und zweiten Schwelle gehörigen Schwellwerte S1, S2. Der Schwellwert S1 ist hier größer als der Schwellwert S2. Die beiden Kriteriumparameter liegen zu den Zeitpunkten vor t1 zunächst noch über dem Schwellwert S1. Zu einem Zeitpunkt t1 fällt der erste Kriteriumparameter, also die Intensität I, unter den Schwellwert S1 um kurz darauf zu einem Zeitpunkt t2 wieder über den Schwellwert S1 anzusteigen. Zwischen den Zeitpunkten t1 und t2 wird also ein Umschalten vorbereitet. Da Internetradio der alternative Empfangsweg ist, in diesem Beispiel eine gute Empfangsqualität für Internetradio angenommen wird, und folglich für ein künftiges Umschalten in Frage kommt, erfolgt ein Zwischenspeichern des über das Internetradio empfangenen Hörfunksignals.In Fig. 2 an exemplary time course of two different criterion parameters is shown in the same situation. The two criterion parameters here are, for example, the intensity I of an FM radio signal and an averaged intensity <I>, which is derived from the intensity I. In the present example, if the FM radio signal deteriorates, switching to Internet radio is an option; digital radio reception is not possible. Both intensities I, <I> are plotted over time t. The threshold values S1, S2 associated with the first and second thresholds are also shown. The threshold value S1 is greater than the threshold value S2 here. At the times before t1, the two criterion parameters are initially still above the threshold value S1. At a point in time t1, the first criterion parameter, that is to say the intensity I, falls below the threshold value S1 in order to rise again shortly afterwards at a point in time t2 above the threshold value S1. A switchover is therefore prepared between times t1 and t2. Since Internet radio is the alternative reception method, in this example a good reception quality is assumed for Internet radio, and consequently for a If future switching is possible, the audio signal received via the Internet radio is temporarily stored.

Dies ist jedoch hier nicht erwünscht, da ein kurzer Ausreißer in der Empfangsqualität nicht zu einem Umschalten auf einen anderen Empfangsweg und folglich auch nicht zu einem Vorbereiten eines Umschaltens führen soll. Bei einem Verwenden der gemittelten Intensität <I> als Kriteriumparameter wird hier die Vorbereitungsphase bzw. das Zwischenspeichern vermieden, da der kurzzeitige Abfall in der Intensität I unter den Schwellwert S1 in der gemittelten Intensität <I> nicht bemerkbar ist. Sinnvollerweise wird jedoch beispielsweise ein späteres, erneutes Abfallen der Intensität I unter den Schwellwert S1 zu einem Zeitpunkt t3 auch bei Betrachtung der gemittelten Intensität <I> erkennbar - wenn auch zu einem im Vergleich zum Zeitpunkt t3 geringfügig versetzten Zeitpunkt tA. Dies ist der Fall, da der Abfall der Intensität I unter den Schwellwert S1 zum Zeitpunkt t3 nicht nur ein kurzzeitiger, deltapeakförmiger Ausreißer ist, sondern es sich hier um ein länger anhaltendes Absinken der Intensität I handelt. Folglich ist es sinnvoll, ein Umschalten auf einen anderen Empfangsweg vorzubereiten, d.h. das Zwischenzuspeichern durchzuführen. Dies tritt hier sowohl bei Betrachtung der gemittelten Intensität <I> als auch bei Betrachtung der Intensität I als Kriteriumparameter ein. Wenn nun beispielsweise nach t4 bzw. tB Intensität I bzw. gemittelte Intensität <I> den ersten Schwellwert S1 übersteigen, wird die Vorbereitungsphase bzw. das Zwischenspeichern wieder unterbrochen, da es nicht mehr zu erwarten ist, dass ein Umschalten auf eine anderen Empfangsweg noch erforderlich sein wird, und die zwischengespeicherte Information wird verworfen. Erst bei einem erneuten Abfall der Intensität I bzw. der gemittelten Intensität <I> zu dem Zeitpunkt t5 bzw. tc unter den Schwellwert S1, wird im vorliegenden Beispiel erneut mit einer Zwischenspeicherung begonnen. Sollte in diesem Fall bspw. noch inzwischen veraltete Information zwischengespeichert sein, so wird diese zuvor verworfen. Diese mündet im gezeigten Beispiel zum Zeitpunkt t6 bzw. tD, zu dem die beiden Kriteriumparameter den zweiten Schwellwert S2 unterschreiten, in ein Umschalten auf Internetradio als Empfangsweg. Hier kann dann sofort auf das zwischengespeicherte Hörfunksignal zugegriffen werden, also das über das Internetradio empfangene Hörfunksignal ohne eine hörbare Wartezeit ausgestrahlt werden.However, this is not desirable here, since a short outlier in the reception quality should not lead to a switchover to a different reception path and consequently also not to a preparation for a switchover. If the averaged intensity <I> is used as the criterion parameter, the preparation phase or the temporary storage is avoided here, since the short-term drop in intensity I below threshold value S1 in the averaged intensity <I> is not noticeable. It makes sense, however, for example to detect a later, renewed drop in intensity I below threshold value S1 at a point in time t3, even when considering the averaged intensity <I> - albeit at a point in time t A that is slightly offset compared to point in time t3. This is the case because the drop in intensity I below threshold value S1 at time t3 is not only a short-term, delta-peak-shaped outlier, but rather a longer-lasting drop in intensity I. Consequently, it makes sense to prepare for switching to a different reception path, ie to carry out intermediate storage. This occurs here both when considering the averaged intensity <I> and when considering intensity I as a criterion parameter. If, for example, after t4 or t B, the intensity I or the averaged intensity <I> exceed the first threshold value S1, the preparation phase or the temporary storage is interrupted again, since it is no longer to be expected that a switch to a different reception path will take place will be required and the cached information will be discarded. Only when the intensity I or the averaged intensity <I> drops again below the threshold value S1 at the point in time t5 or tc, in the present example, intermediate storage is started again. If in this case, for example, outdated information is still temporarily stored, it is discarded beforehand. In the example shown, at time t6 or t D , at which the two criterion parameters fall below the second threshold value S2, this leads to a switchover to Internet radio as the reception path. Here you can immediately access the temporarily stored radio signal can be accessed, i.e. the radio signal received via the Internet radio can be broadcast without an audible waiting time.

Je nach Nutzerpräferenz und gewähltem Kriteriumparameter kann bei einer Verschlechterung der Qualität des Internetradios oder zum Beispiel auch einer Verbesserung der Intensität des FM-Radiosignals ein Rückschalten auf das analoge Radio als Empfangsweg erfolgen. Bei einem Rückschalten kann der Nutzer dann beispielsweise über einen Knopf, einen "Live"-Schalter, wieder zu dem augenblicklich im analogen - verzögerungsfreien und somit im Vergleich zum Internetradio zeitlich voraus liegenden - FM-Rundfunk wiedergegebenen Hörfunkinhalt springen.Depending on the user preference and the selected criterion parameter, if the quality of the Internet radio deteriorates or, for example, the intensity of the FM radio signal improves, a switch back to the analog radio as the reception path can take place. When switching back, the user can then, for example, jump back to the audio content currently being played back in analog FM broadcasting via a button, a "live" switch, which is ahead of time compared to Internet radio.

In Fig. 3 ist ein weiterer beispielhafter Verlauf zweier Kriteriumparameter gezeigt. Beispielsweise ist hier ein analoger Radioempfang über FM nicht erwünscht, sodass zum Beispiel mit DAB ein digitaler Rundfunk und das Internetradio als Empfangswege zur Verfügung stehen. Die Intensität I, beispielsweise die des digitalen DAB-Rundfunksignals bzw. die entsprechende gemittelte Intensität <I> ist als y-Achse und die Zeit t als x-Achse gewählt. Ferner sind die beiden Schwellwerte S1 und S2 eingezeichnet. Zunächst, also zu Zeitpunkten vor t1, liegen Intensität I und gemittelte Intensität <I> noch über dem Schwellwert S1, was sich jedoch zu dem Zeitpunkt t1 bzw. tA ändert. Die stark schwankende Intensität I und in Folge auch die gemittelte Intensität <I> fallen nach den Zeitpunkten t1 bzw. tA unter den ersten Schwellwert S1 fast bis auf den zweiten Schwellwert S2 ab, was im vorliegenden Beispiel mit dem Internetradio als alternativen Empfangsweg ein Zwischenspeichern des über das Internetradio empfangenen Hörfunksignals auslöst, da in diesem Beispiel eine gute Empfangsqualität für das Internetradio angenommen wird. Von der Intensität I wird der Schwellwert S2 in den kurz aufeinander folgenden Zeitpunkten t2, t3, t4 und t5 mehrfach durchschritten. Das kann ein mehrfaches kurz hintereinander erfolgendes Umschalten zwischen verschiedenen Empfangswegen, den sog. "Ping-Pong-Effekt" nach sich ziehen, was jedoch für den Nutzer sehr störend ist. Durch Verwendung der gemittelten Intensität <I> als Kriteriumparameter wird dies im vorliegenden Beispiel von vorneherein vermieden, da die gemittelte Intensität <I> den kurzfristigen Schwankungen der Intensität I nicht folgt und so kein den Zeitpunkten t2, t3, t4 und t5 entsprechendes Durchschreiten des zweiten Schwellwerts S2 erfolgt. Zum Zeitpunkt t5 bzw. nach dem Zeitpunkt t5 hat hier also eine Wahl der Intensität I als Kriteriumparameter unter Umständen bereits zu mehrmaligen Hin- und Herschalten zwischen im vorliegenden Fall DAB und dem Internetradio geführt. Das wird beispielsweise durch Wahl der gemittelten Intensität <I> als Kriteriumparameter vermieden.In Fig. 3 Another exemplary course of two criterion parameters is shown. For example, analog radio reception via FM is not desired here, so that digital radio and Internet radio are available as reception channels with DAB, for example. The intensity I, for example that of the digital DAB radio signal or the corresponding averaged intensity <I>, is selected as the y-axis and the time t as the x-axis. The two threshold values S1 and S2 are also shown. Initially, that is to say at times before t1, intensity I and averaged intensity <I> are still above threshold value S1, but this changes at time t1 and t A , respectively. The strongly fluctuating intensity I and consequently also the averaged intensity <I> fall below the first threshold value S1 almost to the second threshold value S2 after the times t1 or t A , which in the present example is an intermediate storage with the internet radio as an alternative reception path of the radio signal received via the Internet radio, since in this example a good reception quality is assumed for the Internet radio. The intensity I passes through the threshold value S2 several times at the points in time t2, t3, t4 and t5, which follow one another in rapid succession. This can result in switching between different reception paths several times in quick succession, the so-called "ping-pong effect", which, however, is very annoying for the user. By using the averaged intensity <I> as the criterion parameter, this is avoided from the outset in the present example, since the averaged intensity <I> does not follow the short-term fluctuations in the intensity I and so the second threshold value S2 is not crossed corresponding to the times t2, t3, t4 and t5. At the point in time t5 or after the point in time t5, a selection of the intensity I as a criterion parameter may have already led to multiple switching back and forth between, in the present case, DAB and the Internet radio. This is avoided, for example, by choosing the averaged intensity <I> as the criterion parameter.

Nach dem Zeitpunkt t5 steigt die Intensität I wieder, sie steigt sogar kurz, zwischen den unmittelbar aufeinander folgenden Zeitpunkten t6 und t7, auf einen Wert über dem ersten Schwellwert S1 an. Der gemittelte Intensitätswert <I> folgt diesem sprunghaften Anstieg nur mit einer Verzögerung und überschreitet den ersten Schwellwert S1 nicht. Die Wahl der Intensität I als Kriteriumparameter führt zum Zeitpunkt t6 wegen des Überschreitens des Schwellwertes S1 zu einem Unterbrechen bzw. Stoppen des Zwischenspeicherns. Da die Intensität I nach der sehr kurzen Erholung zwischen t6 und dem unmittelbar darauf folgenden Zeitpunkt t7 wieder stark absinkt und zu einem Zeitpunkt t8 den Schwellwert S2 zu unterschreitet, kann das Unterbrechen des Zwischenspeicherns ungünstige Folgen haben - beispielsweise wenn zwischen den beiden Zeitpunkten t7 und t8 noch nicht genug Zeit vergangen ist, um den Zwischenspeicher wieder vollständig zu füllen. In diesem Fall kann bei dem Umschalten auf Internetradio nicht auf ausreichende Information im Zwischenspeicher zurückgegriffen werden, so dass der Nutzer bei einem Umschalten gegebenenfalls eine Unterbrechung im ausgestrahlten Hörfunksignal in Kauf nehmen muss, und zwar für eine Dauer, die zum Beispiel durch ein technisch erforderliches weiteres Zwischenspeichern bedingt ist. Durch die Verwendung der gemittelten Intensität <I> wird im gezeigten Beispiel ein kurzfristiges deltapeakförmiges Überschreiten des Schwellwertes S1 vermieden und in Folge das Zwischenspeichern der Signale aus dem Internetradio bei t6 nicht unterbrochen. So ist beispielsweise bei dem Abfall der gemittelten Intensität <I> zum Zeitpunkt tB, welcher dem Abfall der Intensität I zum Zeitpunkt t8 entspricht, kein erneutes Zwischenspeichern erforderlich, d.h. der Nutzer wird ohne hörbare Pause sofort aus dem Internetradio über das zwischengespeicherte Hörfunksignal mit Informationen versorgt. Sollte zu einem späteren Zeitpunkt beispielweise das DAB-Signal wieder in ausreichender Intensität I zur Verfügung stehen, kann, möglicherweise aus Kostengründen, ein Rückschalten von dem Internetradio auf DAB-Empfang gewünscht sein. Realisiert wird dies beispielsweise über einen Einfluß der Kosten auf den Kriteriumparameter. Wie auch das im vorliegenden Beispiel nicht wählbare FM-Hörfunksignal ist das DAB-Hörfunksignal im Vergleich zum Internetradio-Signal im Allgemeinen zeitlich voraus, sodass bei einem Umschalten von Internetradio zu DAB als Empfangsweg ein Überspringen von Information möglich ist. Es kann zum Beispiel aber auch das DAB-Hörfunksignal zwischengespeichert werden und möglicherweise über eine Korrelationsmethode ein unhörbares Umschalten von Internetradio auf DAB als Empfangsweg von beispielsweise demselben Hörfunksignal durchgeführt werden. Es wird in diesem Fall das mittels DAB empfangene, zu dem zuvor über Internetradio empfangene identische Hörfunksignal verzögert akustisch ausgestrahlt.After the point in time t5, the intensity I rises again, it even rises briefly, between the immediately successive points in time t6 and t7, to a value above the first threshold value S1. The averaged intensity value <I> follows this sudden increase only with a delay and does not exceed the first threshold value S1. The selection of the intensity I as the criterion parameter leads to an interruption or stopping of the intermediate storage at the point in time t6 because the threshold value S1 is exceeded. Since the intensity I drops again sharply after the very brief recovery between t6 and the immediately following point in time t7 and falls below the threshold value S2 at a point in time t8, the interruption of the temporary storage can have unfavorable consequences - for example if between the two points in time t7 and t8 not enough time has passed to completely fill the buffer again. In this case, when switching to Internet radio, sufficient information in the buffer memory cannot be accessed, so that the user may have to accept an interruption in the broadcast radio signal when switching, for a period that is, for example, due to another technically necessary Caching is conditional. By using the averaged intensity <I>, in the example shown, a brief delta-peak exceeding of the threshold value S1 is avoided and, as a result, the buffering of the signals from the Internet radio is not interrupted at t6. For example, if the averaged intensity <I> drops at time t B , which corresponds to the drop in intensity I at time t8, no new intermediate storage is required, i.e. the user is immediately out of the Internet radio via the temporarily stored radio signal with information without an audible pause provided. If, for example, the DAB signal is available again at a later point in time with sufficient intensity I, a switch back from the Internet radio to DAB reception may be desired, possibly for cost reasons. This is achieved, for example, by influencing the costs on the criterion parameter. Like the FM radio signal, which cannot be selected in the present example, the DAB radio signal is generally ahead of the Internet radio signal so that information can be skipped when switching from Internet radio to DAB as the reception path. For example, the DAB radio signal can also be temporarily stored and possibly an inaudible switch from Internet radio to DAB as a reception path for the same radio signal, for example, using a correlation method. In this case, the audio signal received via DAB, identical to the one previously received via Internet radio, is acoustically broadcast with a delay.

Claims (15)

  1. Method for acoustically emitting audio broadcasting signals in a vehicle, wherein audio broadcasting signals can be transmitted into the vehicle and received there over a first and at least a second reception path, wherein the first reception path is evaluated by means of at least one criterion parameter on the basis of an audio broadcasting signal that can be received over the first reception path, and the second reception path is likewise evaluated by means of a criterion parameter on the basis of the audio broadcasting signal that can be received over the second path, wherein
    during an emission of the audio broadcasting signal over one of the reception paths, a preparation phase for preparing a switchover from the current reception path to the other reception path is started on the basis of a comparison of the criterion parameter of the current reception path with a first threshold value (S1), and in the preparation phase, the criterion parameter of the current reception path is compared with a second threshold value (S2) that is lower than the first threshold value (S1), and an examination of the switchover to the other reception path is performed if the criterion parameter of the current reception value is below the second threshold value (S2),
    characterised in that,
    the switchover from a reception path susceptible to delays to a delay-free reception path is performed either without maintaining the delay or with the delay maintained, wherein these two options take place either in accordance with a basic default user setting or on the basis of a specific user selection or instruction, which is performed by means of a user option in a human-machine interface (HMI) of a control device or as a hardware solution in the form of a control element.
  2. Method according to claim 1,
    characterised in that,
    when examining the switchover, the criterion parameter of the other reception path is compared with the second threshold value (S2) and a switchover is made to the other reception path if this criterion parameter has not fallen below the second threshold value (S2) or a shortfall is lower than the shortfall of the criterion parameter of the current reception path.
  3. Method according to claim 1 or 2,
    characterised in that,
    during the preparation phase, the audio broadcasting signal information received over the other reception path, to be emitted on the other reception path following a possible forthcoming switchover, is buffered.
  4. Method according to claim 3,
    characterised in that,
    buffering is started when a path is provided as the other reception path, such that a presentation of the information contained in the audio broadcasting signal is offset in time by an offset period in relation to the presentation of information over the current reception path.
  5. Method according to claim 3 or 4,
    characterised in that
    buffering is started when a reception path can be determined for the future acoustic emission of the audio broadcasting signal, wherein the audio broadcasting signals are transmitted via a mobile communication channel, in particular, that is to say, internet radio for the emission of the audio broadcasting signal.
  6. Method according to claim 5,
    characterised in that
    buffering is started when the switchover from a radio-based reception path to internet radio is intended to be enabled.
  7. Method according to any of the preceding claims,
    characterised in that
    the preparation phase is terminated when an actual switchover to the other reception path is performed and/or the first threshold value (S1) is again exceeded at higher values by the criterion parameter values at least for a predeterminable exceedance period.
  8. Method according to any of the preceding claims,
    characterised in that
    a switchover from the current reception path to the other reception path is performed depending on whether the second threshold value (S2) is not reached by the criterion parameter values for at least a predeterminable shortfall period.
  9. Method according to any of the preceding claims,
    characterised in that
    the respective reception field strength and/or the respective signal-to-noise ratio (SNR) and/or the respective bit error rate (BER) and/or the available data rate within the mobile communication network used and/or the decoder audio quality (service) and/or the Received Signal Strength Indicator (RSSI) and/or a cost factor, which reflects the use of resources such as energy consumption and/or data volume and/or storage capacity and/or processing capacity and/or monetary costs associated with the reception path, are evaluated as criterion parameters for the different reception paths.
  10. Method according to any of the preceding claims,
    characterised in that
    the criterion parameters of the different reception paths are processed by means of signal processing steps and/or calculations as variables selected from the respective reception field strength and/or the respective signal-to-noise ratio (SNR) and/or the respective bit error rate (BER) and/or the available data rate within the mobile communication network used and/or the communication network type and/or possible necessary roaming and/or the decoder audio quality (service) and/or the Fast Information Channel (FIG) and/or the Received Signal Strength Indicator (RSSI) and/or a stereo/mono switchover and/or a cost factor, which reflects the use of resources such as energy consumption and/or data volume and/or storage capacity and/or processing capacity and/or monetary costs associated with the reception path, such that the chronological sequence takes account of the individual variables and, in particular, isolated short-term exceedances and/or shortfalls, or those occurring directly after a switchover, in relation to the two threshold values (S1, S2) by the criterion parameter are prevented.
  11. Method according to any of the preceding claims,
    characterised in that
    the criterion parameters of the different reception paths are processed as variables such that anticipated changes to the respective reception field strength and/or the respective signal-to-noise ratio (SNR) and/or the respective bit error rate (BER) and/or the available data rate within the mobile communication network used and/or the communication network type and/or possible necessary roaming and/or the decoder audio quality (service) and/or the Fast Information Channel (FIG) and/or the Received Signal Strength Indicator (RSSI) and/or a stereo/mono switchover and/or a cost factor, which reflects the use of resources such as energy consumption and/or data volume and/or storage capacity and/or processing capacity and/or monetary costs associated with the reception path, are taken into account.
  12. Method according to any of the preceding claims,
    characterised in that
    the switchover to a reception path susceptible to delays, in particular to internet radio, can take place by means of cross-fading or silent switching.
  13. Method according to any of the preceding claims,
    characterised in that,
    when the switchover is performed from a reception path susceptible to delays to a delay-free reception path while maintaining the delay, this is performed by means of a correlation method and buffering of the audio broadcasting signal from the delay-free reception path.
  14. Information presentation system for acoustically emitting audio broadcasting signals in a vehicle, with at least one acoustic source and a receiver unit for receiving audio broadcasting signals, wherein audio broadcasting signals can be transmitted over a first and over at least a second reception path into the vehicle and received there, wherein the receiver unit is configured such that the first reception path is evaluated by means of at least one criterion parameter on the basis of the audio broadcasting signal that can be received over the first reception path, and the second reception path is likewise evaluated by means of a criterion parameter on the basis of the audio broadcasting signal that can be received over the second path, wherein the receiver unit is configured such that, during an emission of the audio broadcasting signal over one of the reception paths, a preparation phase for preparing a switchover from the current reception path to the other reception path is started on the basis of a comparison of the criterion parameter of the current reception path with a first threshold value (S1) and, in the preparation phase, the criterion parameter of the current reception path is compared with a second threshold value (S2) that is lower than the first threshold value (S1) and an examination of the switchover to the other reception path is performed if the criterion parameter of the current reception value is below the second threshold value (S2),
    characterised in that
    the receiver unit is configured, that the switchover from a reception path susceptible to delays to a delay-free reception path is performed either without maintaining the delay or with the delay maintained, by the receiver unit being configured, that these two options take place either in accordance with a basic user default setting or on the basis of a specific user selection or instruction, which is performed by means of a user option in a human-machine interface (HMI) of a control device or as a hardware solution in the form of a control element.
  15. Vehicle with an information presentation system according to claim 14.
EP14705478.7A 2013-06-08 2014-02-19 Evaluation and acoustic emission of audio broadcasting signals in a vehicle Active EP3005591B1 (en)

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PCT/EP2014/000445 WO2014194970A1 (en) 2013-06-08 2014-02-19 Evaluation and acoustic emission of audio broadcasting signals in a vehicle

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