EP3001587B1 - Funkempfangs vorrichtung und verfahren von schaltrunndfunkdienste - Google Patents

Funkempfangs vorrichtung und verfahren von schaltrunndfunkdienste Download PDF

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Publication number
EP3001587B1
EP3001587B1 EP15185055.9A EP15185055A EP3001587B1 EP 3001587 B1 EP3001587 B1 EP 3001587B1 EP 15185055 A EP15185055 A EP 15185055A EP 3001587 B1 EP3001587 B1 EP 3001587B1
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EP
European Patent Office
Prior art keywords
service
broadcasting service
broadcasting
reception
dab
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EP15185055.9A
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English (en)
French (fr)
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EP3001587A1 (de
Inventor
Yoshihisa Iwamoto
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Alpine Electronics Inc
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Alpine Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the present invention relates to a feature for switching a reception broadcasting service from a broadcasting service being currently received to another broadcasting service, the content of which is the same as that of the broadcasting service being currently received by a radio broadcasting reception device for receiving a plurality of radio broadcasts adhering to different broadcasting standards.
  • the radio broadcasting reception device for receiving a plurality of radio broadcasts adhering to different broadcasting standards, when a reception broadcasting service is switched from a broadcasting service being currently received to another broadcasting service, the content of which is the same as that of the currently received broadcasting service, instantaneous switching may result in rapid changes in the volume and the quality of output sound, thereby annoying the user.
  • DRM Digital Radio Mondiale
  • ETSI European Telecommunications Standards Institute
  • 650 Route des Lucioles F-06921 Sophia Antipolis, France, vol. Broadcas, no. V4.1.1, 1 January 2014 discloses a receiver implementation to solve the problem of rapid changes of the volume and the quality of output sound by performing a time limited cross-fading between two audio signals, or by calculating the correlation of the decoded audio signals and adjust its internal delay value accordingly, or by adjusting the audio loudness level of the different sources.
  • US 2011/110464 A1 relates to a radio broadcast receiver that includes a broadcast reception and reproduction unit for outputting a digital sound when being able to receive a digital signal included in a terrestrial digital radio broadcast, and for outputting an analog sound when being unable to receive the digital signal, and a control unit for determining the broadcast type of the digital terrestrial broadcast received by the broadcast reception and reproduction unit to carry out variable control of a transition time required to switch from an output of the analog sound to an output of the digital sound according to the determined broadcast type.
  • the radio broadcast receiver controls a transition time according to the determined broadcast type of a received terrestrial digital radio broadcast including an HD radio broadcast so as to be able to provide a comfortable receiving environment for a user without making the user feel bad also at the time of switching between broadcast types.
  • the invention relates to a radio broadcasting reception device and a method according to the independent claim 1 and claim 3 respectively.
  • a radio broadcasting reception device capable of receiving a plurality of radio broadcasts adhering to different broadcasting standards includes a reception state detection section for detecting a reception quality of a currently received broadcasting service which is a broadcasting service being received and the sound of which is being output, and a broadcasting service switching section for switching from a switching source broadcasting service, which is the currently received broadcasting service, to a switching destination broadcasting service, which is a broadcasting service of which the content is the same as that of the currently received broadcasting service and the reception quality of which is good, when the reception quality of the currently received broadcasting service deteriorates.
  • the broadcasting service switching section includes a cross-fade time setting section that sets a cross-fade time to a first time period when the switching source broadcasting service and the switching destination broadcasting service are of a same broadcasting standard, and sets a cross-fade time to a second time period, which is longer than the first time period, when the switching source broadcasting service and the switching destination broadcasting service are of different broadcasting standards, and a mix section that performs switching from the switching source broadcasting service to the switching destination broadcasting service in such a manner that the mix section starts to receive the switching destination broadcasting service while still receiving the switching source broadcasting service, and outputs a sound to be output by cross-fading a sound signal of the switching source broadcasting service with a sound signal of the switching destination broadcasting service in such a manner that the switching is performed gradually over the time period set as the cross-fade time.
  • the plurality of different broadcasting standards may include DAB and FM broadcasts, DAB+ and FM broadcasts, DAB and DAB+ broadcasts or DAB, DAB+ and FM broadcasts.
  • a radio broadcasting reception device capable of receiving digital radio broadcasts and analog radio broadcasts includes a reception state detection section for detecting a reception quality of a currently received broadcasting service which is a broadcasting service being received and the sound of which is being output, and a broadcasting service switching section for, if the currently received broadcasting service is a broadcasting service of a digital radio broadcast, switching from a switching source broadcasting service, which is the currently received broadcasting service, to a switching destination broadcasting service, which is a broadcasting service of which the content is the same as that of the currently received broadcasting service and the reception quality of which is good, when the reception quality of the currently received broadcasting service deteriorates.
  • the broadcasting service switching section includes a cross-fade time setting section that sets a cross-fade time to a first time period when the switching destination broadcasting service is a broadcasting service of digital radio broadcasting, and sets a cross-fade time to a second time period, which is longer than the first time period, when the switching destination broadcasting service is a broadcasting service of analog radio broadcasting, and a mix section that performs switching from the switching source broadcasting service to the switching destination broadcasting service in such a manner that the mix section starts to receive the switching destination broadcasting service while still receiving the switching source broadcasting service, and outputs a sound to be output by cross-fading the sound of the switching source broadcasting service with the sound of the switching destination broadcasting service in such a manner that the switching is performed gradually over the time period set as the cross-fade time.
  • the digital radio broadcast may be a DAB broadcast and the analog radio broadcast may be an FM broadcast.
  • the digital radio broadcasting may be a DAB+ broadcast and the analog radio broadcasting may be an FM broadcast.
  • Each of the radio broadcasting reception devices described above may be a mobile radio broadcasting reception device such as a radio broadcasting reception device installed in a vehicle or a radio broadcasting reception device installed in a portable terminal.
  • switching of the audio to be output from the reception target broadcasting service to the alternative broadcasting service may be performed quickly with a cross-fade of a short duration, and in a case where the reception target broadcasting service and the alternative broadcasting service are not broadcasting services adhering to the same broadcasting standard, switching of the audio to be output from the reception target broadcasting service to the alternative broadcasting service may be performed gradually with a cross-fade of a longer duration.
  • the reception target broadcasting service and the alternative broadcasting service are broadcasting services adhering to the same broadcasting standard, the difference in sound quality of output audio between the respective broadcasting services, and any difference in volume can be expected to be small. Therefore, the listener can be spared the annoyance of rapid changes in volume and sound quality by a rapid cross-fade being performed between program content. In addition, the time period in which the audio reception quality of the reception target broadcasting service deteriorates can be minimized.
  • the reception target broadcasting service and the alternative broadcasting service are broadcasting services adhering to different broadcasting standards, it is common that the differences in the sound quality and volume between the broadcasting services are large. Therefore, the listener can be spared the annoyance of rapid changes in volume and sound quality by a gradual cross-fade being performed between program content.
  • the broadcasting service when the reception quality of a reception target broadcasting service deteriorates, the broadcasting service can be switched as quickly as possible to a broadcasting service broadcasting the same content to minimize annoying the listener due to rapid changes in volume and sound quality.
  • Fig. 1 shows a configuration of a radio broadcasting reception device according to a present embodiment.
  • the radio broadcasting reception device is a mobile radio broadcasting reception device such as a radio broadcasting reception device installed in a vehicle or a radio broadcasting reception device installed in a portable terminal.
  • the portable terminal in which the radio broadcasting reception device is installed may be a dedicated portable radio reception terminal, or may be an arbitrary portable terminal such as a mobile phone terminal, a smart-phone, a tablet computer, or a portable music player.
  • the radio broadcasting reception device is provided with two systems of digital radio reception section 1, two systems of analog radio reception section 2, a selector 3, a mix section 4, an amplifier 5, a speaker 6, a control section 7, a display section 8, and an operation section 9.
  • the digital radio reception sections 1 are reception sections that receive radio broadcasts adhering to a Digital Audio Broadcasting (DAB) standard and a DAB+ standard, which is an enhanced version of DAB, and each digital radio reception section 1 is provided with a DAB/DAB+ front-end (DAB/DAB+ F/E) 11, a DAB/DAB+ decoder 12, an audio decoder 13, and a DA converter (DAC) 14.
  • DAB Digital Audio Broadcasting
  • DAB+ F/E DAB/DAB+ front-end
  • DAC DA converter
  • the analog radio reception sections 2 are reception sections that receive radio broadcasts adhering to an FM broadcasting standard, and each analog radio reception device 2 is provided with an FM front-end (FM/F/E) 21, an FM demodulation section 22, and an RDS decoder 23.
  • FM/F/E FM front-end
  • FM demodulation section 22 FM demodulation section 22
  • RDS decoder 23 RDS decoder
  • a plurality of services each service corresponding to one audio broadcast, can be broadcast on a single frequency channel, and each service is identified by a service identifier SID broadcast by the service.
  • a group of services broadcast on the same frequency channel is called an ensemble.
  • the digital radio reception section 1 performs the following service reception operation.
  • the DAB/DAB+ front-end 11 of the digital radio reception section 1 receives a signal on frequency channel that has been set as a DAB/DAB+ reception channel and transmits pieces of received data to the DAB/DAB+ decoder 12.
  • the DAB/DAB+ decoder 12 extracts a piece of audio data received by a service that has been set as a DAB/DAB+ reception service from the pieces of received data that have been received from the DAB/DAB+ front-end 11, transmits the piece of audio data to the audio decoder 13, transmits a service identifier SID received by the service, which has been set as the reception service, and transmits service linking information received from the DAB and DBA+ to the control section 7.
  • the audio decoder 13 decodes the piece of audio data, which has been transmitted from the DAB/DAB+ decoder 12, by using a decoding method corresponding to the DAB or DAB+ standard, and transmits the decoded audio data to the DA converter 14, and the DA converter 14 converts the decoded audio data to analog audio signals and outputs the analog audio signals to the selector 3. Furthermore, the DAB/DAB+ front-end 11 and the DAB/DAB+ decoder 12 notify the control section 7 of pieces of information related to the reception quality of the DAB or DAB+ service, such as the reception electric field intensity and the S/N ratio of the DAB reception channel and the error rate of the reception data.
  • a service that is specified in the DAB/DAB+ reception service in an ensemble specified in the DAB/DAB+ reception channel corresponds to a service of the reception operation target.
  • the analog radio reception section 2 performs the following station reception operation.
  • the FM front-end 21 of the analog radio reception section 2 receives a signal on a frequency channel that has been set as an FM reception channel and transmits the received signals to the FM demodulation section 22.
  • the demodulation section 22 demodulates the received signals into audio signals and transmits the audio signals to the selector 3.
  • the received signals include data that is transmitted after being multiplexed onto audio signals by a radio data system (RDS)
  • the FM demodulation section 22 transmits the data to the RDS decoder 23, and the RDS decoder 23 decodes the data and transmits the decoded data to the control section 7.
  • the pieces of data that the RDS decoder 23 transmits to the control section 7 include a program identifier PI which is an identifier of a program broadcast by FM broadcast by a station corresponding to the frequency channel set as the FM reception channel, an AF list, and so on.
  • the FM front-end 21 also notifies the control section 7 of pieces of information related to the reception quality of the FM broadcast of the FM reception channel, such as the reception electric field intensity and the S/N ratio of the FM reception channel.
  • a station that is specified in the FM reception service corresponds to a station of the reception operation target.
  • the control section 7 calculates the reception quality of the DAB or DAB+ service for which the digital radio reception section 1 performs a reception operation on the basis of the information related to service reception quality notified by the digital radio reception section 1, and calculates the reception quality of the FM broadcast for which the analog radio reception section 2 performs a reception operation on the basis of the information related to the FM broadcast reception quality notified by the FM front-end 21 of the analog radio reception section 2.
  • a DAB or DAB+ service and an FM station that broadcasts a program having a PI corresponding to the SID of the DAB or DAB+ service have a mutual relationship of simultaneous broadcast, and whereby the same program content is broadcast.
  • the AF list received during an FM broadcast is a list of FM broadcast frequencies of the program with the same PI.
  • the service linking information received in DAB or DAB+ indicates, for each program, the identifications of DAB/DAB+ services and FM broadcast stations that broadcast the program.
  • control section 7 can obtain DAB and DAB+ services and FM broadcasts of the same content, on the basis of the SIDs of the DAB and DAB+ services, PIs of the FM broadcasts, the AF lists received in the FM broadcasts, and service linking information received in DAB and DAB+.
  • control section 7 calculates the reception quality of a DAB or DAB+ service from the information related to the reception quality of the DAB or DAB+ service notified by the DAB/DAB+ front-end 11 and the DAB/DAB+ decoder 12 as described above.
  • the control section 7 also calculates the reception quality of an FM broadcast station from the information related to the reception quality of the FM broadcast on the FM reception channel notified by the FM front-end 21 as descried above.
  • the control section 7 accepts, via the operation section 9, a user request to receive a specific broadcast service.
  • each DAB/DAB+ service and each FM broadcast station corresponds to a broadcast service.
  • control section 7 When accepting a request for receiving a specific DAB or DAB+ service, the control section 7 switches a reception target broadcasting service to the service that is requested to be received, and when accepting a request for receiving a specific FM broadcast station, the control section 7 switches a reception target broadcasting service to the station that is requested to be received.
  • the control section 7 sets one of the digital radio reception sections 1 to a current reception section if the switching destination is a service, then sets, as a DAB/DAB+ reception channel, a frequency channel of an ensemble including the service in the DAB/DAB+ front-end 11, and sets, as a DAB/DAB+ reception service, the service in the DAB/DAB+ decoder 12 of the current reception section, thereby causing the digital radio reception section 1 set as the current reception section to perform an operation for receiving the service.
  • control section 7 controls the selector 3 to output audio signals, which have been output by the DA converter 14 of the current reception section, to the mix section 4, and controls the mix section 4 to output the audio signals, which have been output by the DA converter 14 of the current reception section to the mix section 4 through the selector 3, directly to the amplifier 5. Then, the amplifier 5 amplifies the audio signals received from the mix section 4, and the speaker 6 outputs sound.
  • the control section 7 sets one of the analog radio reception sections 2 to a current reception section if the switching destination is an FM broadcast station, then sets, as an FM reception channel, a frequency of the FM broadcast station in the FM front-end 21 of the current reception section, thereby causing the analog radio reception section 2 set as the current reception section to perform an operation for receiving the broadcast.
  • the control section 7 controls the selector 3 to output audio signals, which have been output by the FM demodulation section 22 of the current reception section, to the mix section 4, and controls the mix section 4 to output the audio signals, which have been output by the FM demodulation section 22 of the current reception section to the mix section 4 through the selector 3, directly to the amplifier 5.
  • the amplifier 5 amplifies the audio signals received from the mix section 4, and the speaker 6 outputs sound.
  • the audio which is broadcast on the FM broadcast station that a listener requests to receive, is output to the listener by the speaker 6.
  • the control section 7 While using the current reception section to receive the reception target broadcasting service and output program content to the speaker 6, the control section 7 repeatedly performs processing to check the reception quality of each of the DAB and DAB+ services and the FM broadcasts that broadcast a program corresponding to content the same as that of the reception target broadcasting service, by using the other digital radio reception section 1, which is not set as the current reception section, and the other analog radio reception section 2, which is not set as the current reception section.
  • the check of the reception quality of the DAB or DAB+ service is performed by using the digital radio reception section 1, which is not set as the current reception section, to perform an operation for receiving the service for which the reception quality is to be checked, and by calculating the reception quality of the service on the basis of the information related to the reception quality of the DAB or DAB+ service notified by the DAB/DAB+ front-end 11 and the DAB/DAB+ decoder 12 of the digital radio reception section 1, which performs the operation for receiving the service for which the reception quality is to be checked, as described above.
  • the check of the reception quality of the FM broadcast station is performed by using the analog radio reception section 2, which is not set as the current reception section, to perform an operation for receiving the broadcast the reception quality of which is to be checked, and by calculating the reception quality of the station on the basis of the information related to the reception quality of the FM broadcast station notified by the FM front-end 21 of the analog radio reception section 2, which performs the operation for receiving the broadcast for which the reception quality to be checked, as described above.
  • control section 7 performs automatic switching processing illustrated in Fig. 2 while receiving the reception target broadcast service by using the current reception section and outputting program content to the speaker 6.
  • the reception quality of a reception target broadcasting service is calculated (step 202).
  • the calculation is performed by calculating the reception quality of the service as the reception quality of the reception target broadcasting service on the basis of the information related to the reception quality of the DAB or DAB+ service notified by the DAB/DAB+ front-end 11 and the DAB/DAB+ decoder 12 of the current reception section.
  • the calculation is performed by calculating the reception quality of the station as the reception quality of the reception target broadcasting service on the basis of the information related to the reception quality of the FM broadcast notified by the FM front-end 21 of the current reception section.
  • the predetermined level in this case is a level at which a predetermined margin is added to the minimum level at which the broadcast can be received properly.
  • the alternative broadcasting service is set by selecting, from among DAB or DAB+ services that broadcast a program corresponding to content the same as that of the reception target broadcasting service and FM broadcast stations that broadcast a program corresponding to content the same as that of the reception target broadcasting service, alternative candidate broadcasts each having higher reception quality than the abovementioned predetermined level and higher reception quality than the reception quality of the reception target broadcasting service, and by setting an alternative candidate broadcast having the highest reception quality among the alternative candidate broadcasts as the alternative broadcasting service.
  • the DAB or DAB+ service may be preferentially set as the alternative broadcasting service.
  • step 206 If there is no available alternative broadcasting service (step 206), the process returns to step 202.
  • an alternative broadcasting service is available (step 206)
  • the alternative broadcasting service reception section is controlled to start receiving the alternative broadcasting service
  • the selector 3 is controlled to output, in addition to the audio being output from the current reception section, the audio signals output from the alternative broadcasting service reception section to mix section 4 (step 208).
  • the alternative broadcasting service is a DAB or DAB+ service
  • one of the digital radio reception sections 1, the digital radio reception section not being set as the current reception section is set as an alternative broadcasting service reception section
  • the digital radio reception section 1, which is set as the alternative broadcasting service reception section is controlled to start receiving the service that is set as the alternative broadcasting service
  • the selector 3 is controlled to output audio signals being output from the digital radio reception section 1 that is set as the alternative broadcasting service reception section, to the mix section 4.
  • the alternative broadcasting service is an FM broadcast
  • one of the analog radio reception sections 2, the analog radio reception section not being set as the current reception section is set as an alternative broadcasting service reception section
  • the analog radio reception section 2, which is set as the alternative broadcasting service reception section is controlled receiving the station that is set as the alternative broadcasting service
  • the selector 3 is controlled to output audio signals being output from the analog radio reception section 2 that is set as the alternative broadcasting service reception section, to the mix section 4.
  • the reception target broadcasting service and the alternative broadcasting service are the broadcasting services adhering to the same broadcasting standard (step 210).
  • the reception target broadcasting service and the alternative broadcasting service are broadcasting services adhering to the same broadcasting standard.
  • a first time period (100 ms, for example) is set as the cross-fade time in the mix section 4 (step 212)
  • a second time period (500 ms, for example), which is longer than the first time period, is set as the cross-fade time in the mix section 4 (step 214).
  • the mix section 4 is controlled to cross-fade audio signals of the reception target broadcasting service and audio signals of the alternative broadcasting service over the set cross-fade time period (step 216).
  • the cross-fade operation will be described later.
  • the service or the station subjected to the reception target broadcasting service is switched to the service or the station that has been set as the alternative broadcasting service, and the current reception section is switched to the digital radio reception section 1 or the analog radio reception section 2 that has been set as the alternative broadcasting service reception section (step 220). Then, the process returns to step 202.
  • the mix section 4 has two variable gain amplifiers 41, a synthesis section 42, and a mix control section 43.
  • Each of the two variable gain amplifiers 41 amplifies an audio signal of the corresponding system received from the selector 3 according to a gain level set by the mix control section 43 and outputs the audio signal to the synthesis section 42, which synthesizes audio signals of the two systems received from the two variable gain amplifiers 41 and outputs the synthesized signal to the amplifier 5.
  • the mix control section 43 sets the gain of one variable gain amplifier 41, to which the audio signal of the reception target broadcasting service received from the selector 3 is input, to a predetermined standard gain Gstd and sets the gain of the other variable gain amplifier 41 to zero amplification factor (output level 0), thereby outputting to the amplifier 5 via the synthesis section 42 only the audio signals of the reception target broadcasting service, with the audio signals being amplified to the standard gain Gstd.
  • variable gain amplifier 41 to which the audio signal of the reception target broadcasting service is input is determined according to the control contents sent to the selector 3 by the control section 7, and the mix control section 43 is notified by the control section 7 of the identification of the variable gain amplifier 41 to which the audio signal of the reception target broadcasting service is input.
  • the mix control section 43 performs the cross-fading operation to cross-fade the audio signals of the reception target broadcasting service input by the selector 3 with the audio signals of the alternative broadcasting service within the set cross-fade time.
  • the mix control section 43 gradually reduces the gain of the variable gain amplifier 41 to which the audio signal of the reception target broadcasting service output by the current reception section is received from the selector 3, from the standard gain Gstd to zero amplification factor over the time period of time Tbl, which is set as the cross-fade time, while gradually increasing the gain of the variable gain amplifier 41 to which the audio signal of the alternative broadcasting service output by the alternative broadcasting service reception section is received from the selector from zero amplification factor to the standard gain Gstd over the time period of time Tbl, which is set as the cross-fade time.
  • the gains of the respective variable gain amplifiers 41 are maintained as part of the cross-fading operation. Note that, when the cross-fading operation is completed, the alternative broadcasting service becomes the new reception target broadcasting service, and therefore the gains of the respective variable gain amplifiers 41 are maintained in the same state as they were when the cross-fading operation was completed.
  • variable gain amplifier 41 to which the audio signal of the reception target broadcasting service is input and the variable gain amplifier 41 to which the audio signal of the alternative broadcasting service is input are determined according to the control contents sent to the selector 3 by the control section 7, and the mix control section 43 is notified by the control section 7 of the identification of the variable gain amplifier 41 to which the audio signal of the reception target broadcasting service is input and the identification of the variable gain amplifier 41 to which the audio signal of the alternative broadcasting service is input.
  • the audio output by the speaker 6 is gradually cross-fade from the audio of the reception target broadcasting service to the audio of the alternative broadcasting service over the time period Tbl, which has been set as the cross-fade time.
  • the first time period (100 ms, for example), which is relatively short, is set as the cross-fade time, as illustrated in Fig. 4A .
  • the second time period (500 ms, for example), which is relatively long, is set as the cross-fade time, as illustrated in Fig. 4B .
  • switching of the audio to be output by the speaker 6 from the reception target broadcasting service to the alternative broadcasting service is performed quickly with a cross-fade of a short duration, and in a case where the reception target broadcasting service and the alternative broadcasting service are not broadcasting services adhering to the same broadcasting standard, switching of the audio to be output from the speaker 6 from the reception target broadcasting service to the alternative broadcasting service is performed gradually with a cross-fade of a longer duration.
  • reception target broadcasting service and the alternative broadcasting service are broadcasting services adhering to the same broadcasting standard, such as in a case where both services are DAB services, DAB+ services, or FM broadcast stations
  • the difference in sound quality of output audio between the respective broadcasting services, and any difference in volume can be expected to be small. Therefore, as in the case of the present embodiment, in a case where the reception target broadcasting service and the alternative broadcasting service are broadcasting services adhering to the same broadcasting standard, the listener can be spared the annoyance of rapid changes in volume and sound quality by a rapid cross-fade being performed between program content. In addition, the time period in which the audio reception quality of the reception target broadcasting service deteriorates can be minimized.
  • the reception target broadcasting service and the alternative broadcasting service are broadcasting services adhering to different broadcasting standards, such as in a case of a DAB service and a DAB+ service, a case of a DAB service and an FM broadcast station, a case of a DAB+ service and an FM broadcast station, a case of a DAB+ service and a DAB service, a case of an FM broadcast service and a DAB service, and a case of an FM broadcast service and a DAB+ service, it is common that the differences in the sound quality and volume between the broadcasting services are large.
  • the listener in a case where the reception target broadcasting service and the alternative broadcasting service are not broadcasting services adhering to the same broadcasting standard, the listener can be spared the annoyance of rapid changes in volume and sound quality by a gradual cross-fade being performed between program content.
  • the broadcasting service when the reception quality of a reception target broadcasting service deteriorates, the broadcasting service is switched as quickly as possible to a broadcasting service broadcasting the same content to minimize annoying the listener due to rapid changes in volume and sound quality.
  • each digital radio reception section 1 receives both DAB and DAB+ services, but may be configured to receive either DAB or DAB+ service.
  • automatic switching processing may be configured so as not to perform switching of a reception target broadcasting service between FM broadcast stations.

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  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (3)

  1. Radiorundfunkempfangsvorrichtung, die in der Lage ist, eine Mehrzahl von Radiorundfunkübertragungen zu empfangen, die unterschiedlichen Rundfunkstandards entsprechen, die DAB-, DAB+- und FM-Rundfunkübertragungen umfassen, umfassend:
    einen Empfangszustandserfassungsabschnitt (11, 12, 21), der dazu ausgelegt ist, eine Empfangsqualität eines momentan empfangenen Rundfunkdienstes zu erfassen, der ein Rundfunkdienst ist, der empfangen wird und dessen Ton ausgegeben wird; und
    einen Rundfunkdienstumschaltabschnitt (3, 4, 7), der dazu ausgelegt ist, von einem Umschaltquellenrundfunkdienst, der der momentan empfangene Rundfunkdienst ist, zu einem Umschaltzielrundfunkdienst, der ein Rundfunkdienst ist, dessen Inhalt der gleiche wie der des momentan empfangenen Rundfunkdienstes ist und dessen Empfangsqualität gut ist, umzuschalten, wenn sich die Empfangsqualität des momentan empfangenen Rundfunkdienstes verschlechtert,
    dadurch gekennzeichnet, dass der Rundfunkdienstumschaltabschnitt (3, 4, 7) umfasst
    einen Überblendungszeiteinstellungsabschnitt (4, 7), der dazu ausgelegt ist, eine Überblendungszeit auf eine erste Zeitdauer (Tbl) einzustellen, wenn der Umschaltquellenrundfunkdienst, der ein Rundfunkdienst aus der Gruppe bestehend aus einem DAB-Dienst, DAB+-Dienst und FM-Dienst ist, und der Umschaltzielrundfunkdienst, der ein Rundfunkdienst aus der Gruppe bestehend aus einem DAB-Dienst, DAB+-Dienst und FM-Dienst ist, von einem gleichen Übertragungsstandard sind, und eine Überblendungszeit (Tbl) auf eine zweite Zeitdauer einzustellen, die länger als die erste Zeitdauer ist, wenn der Umschaltquellenrundfunkdienst und der Umschaltzielrundfunkdienst von unterschiedlichen Übertragungsstandards sind, und
    einen Mischabschnitt (4), der dazu ausgelegt ist, ein Umschalten von dem Umschaltquellenrundfunkdienst auf den Umschaltzielrundfunkdienst durchzuführen, wobei der Mischabschnitt (4) dazu ausgelegt ist, mit dem Empfangen des Umschaltzielrundfunkdienstes zu beginnen, während er noch den Umschaltquellenrundfunkdienst empfängt, und einen Ton auszugeben, der durch Überblenden eines Tonsignals des Umschaltquellenrundfunkdienstes mit einem Tonsignal des Umschaltzielrundfunkdienstes auszugeben ist, wobei das Umschalten während der Zeitdauer, die als die Überblendungszeit eingestellt ist, graduell durchgeführt wird.
  2. Radiorundfunkempfangsvorrichtung nach Anspruch 1,
    wobei die Radiorundfunkempfangsvorrichtung in einem mobilen Körper oder einem tragbaren Endgerät eingebaut ist.
  3. Verfahren zum Umschalten zwischen Empfangsrundfunkdiensten zum Umschalten zu einem Rundfunk, der empfangen wird und dessen Ton von einer Radiorundfunkempfangsvorrichtung ausgegeben wird, die in der Lage ist, eine Mehrzahl von Radiorundfunkübertragungen zu empfangen, die unterschiedlichen Übertragungsstandards entsprechen, die DAB-, DAB+- und FM-Rundfunkübertragungen umfassen, umfassend:
    einen Empfangszustandserfassungsschritt (202) zum Erfassen einer Empfangsqualität eines momentan empfangenen Rundfunkdienstes, der ein Rundfunkdienst ist, der empfangen wird und dessen Ton ausgegeben wird; und
    einen Rundfunkdienstumschaltschritt (208-216) des Umschaltens von einem Umschaltquellenrundfunkdienst, der der momentan empfangene Rundfunkdienst ist und der ein Rundfunkdienst aus der Gruppe bestehend aus einem DAB-Dienst, DAB+-Dienst und FM-Dienst ist, zu einem Umschaltzielrundfunkdienst, der ein Rundfunkdienst aus der Gruppe bestehend aus einem DAB-Dienst, DAB+-Dienst und FM-Dienst ist und der ein Rundfunkdienst ist, dessen Inhalt der gleiche ist wie der des momentan empfangenen Rundfunkdienstes ist und dessen Empfangsqualität gut ist, wenn sich die Empfangsqualität des momentan empfangenen Rundfunkdienstes verschlechtert,
    dadurch gekennzeichnet, dass in dem Rundfunkdienstumschaltschritt (208-216)
    eine Überblendungszeit (Tbl) auf eine erste Zeitdauer eingestellt wird, wenn der Umschaltquellenrundfunkdienst und der Umschaltzielrundfunkdienst von einem gleichen Übertragungsstandard sind, und eine Überblendungszeit (Tbl) auf eine zweite Zeitdauer eingestellt wird, die länger als die erste Zeitdauer ist, wenn der Umschaltquellenrundfunkdienst und der Umschaltzielrundfunkdienst von unterschiedlichen Übertragungsstandards sind, und
    das Umschalten von dem Umschaltquellenrundfunkdienst auf den Umschaltzielrundfunkdienst derart durchgeführt wird, dass ein auszugebender Ton durch Überblenden des Tons des Umschaltquellenrundfunkdienstes mit dem Ton des Umschaltzielrundfunkdienstes derart ausgegeben wird, dass das Umschalten während der Zeitdauer, die als die Überblendungszeit eingestellt ist, graduell durchgeführt wird.
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