JP2000134119A - Radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smooth switching from digital audio broadcasting by retrieving a broadcast station ID of an analog audio broadcast with data information from service linking information when an audio output means obtains an output changeover to the selection of the analog audio broadcast with data information and selecting an output to a broadcast program with the retrieved broadcast station ID. SOLUTION: Whether or not automatic changeover from a digital audio broadcasting DAB into a radio data system RDS is started is discriminated, and when the result of discrimination is 'yes', the presence of a service linking is detected. If service linking is present, whether or not a service identifier SID of the service that is being listened to at present is available is discriminated. When the result of discrimination is 'yes', a program identifier PI code of the RDS linked with the SID of the service, that is being listened to at present, is retrieved from an ID list and an RDS turner section 14 retrieves the same code as the retrieved code.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, DAB
(Digital Audio Broadcasti
ng) and RDS (Radio Data System)
The present invention relates to a radio receiver capable of listening to both digital audio broadcasting with data information and analog audio broadcasting with data information as in m), and more specifically, from a digital audio broadcasting with data information to an analog audio broadcasting with data information for the same radio program. The present invention relates to a radio receiver that can be switched smoothly.

[0002]

2. Description of the Related Art The same radio program is composed of DAB as digital audio broadcasting with data information and RDS as analog audio broadcasting with data information (RDS is FDS).
It is also an M broadcast. ) May be broadcast simultaneously in both broadcast formats. Also, the coverage area of DAB radio waves is usually smaller than that of RDS. In the DAB / RDS shared car radio, the reception state such as the electric field strength of the radio wave changes with the movement of the car. Switching from DAB to RDS is performed and RD
The same S radio program is output.

[0003]

SUMMARY OF THE INVENTION Conventional DAB / RDS
In switching from DAB to RDS for the same radio program in the shared receiver, SId (= Service Id) as the service ID of the DAB service currently being listened to is used.
same as the PI code (Progr)
am Identifier code. The PI code corresponds to a broadcasting station ID of analog audio broadcasting with data information. ) (SId is PDS)
Since it is defined in the same way as the I code,
d "," PI code "and DAB and RDS, although the codes are generally the same, the codes are generally the same.) However, even if the service company is the same, for example, B
Like BC, SId in DAB is C221 and PI code in RDS is C201.
Even if there is an RDS that is broadcasting the same radio program as the DAB, the RDS cannot be effectively searched for, and there is a problem in switching from the DAB to the RDS for the same radio program.

[0004] It is an object of the present invention to provide a radio receiver which overcomes the above-mentioned problems.

[0005]

A radio receiver according to the present invention.
(10) is capable of receiving analog audio broadcasting with data information and digital audio broadcasting with data information. The analog audio broadcast with data information includes the broadcast station ID as data information, and the digital audio broadcast with data information includes
For the digital audio broadcasting service with data information and the broadcasting station of analog audio broadcasting with data information related to each other that are broadcasting the same radio program, the SId and the analog with data information for the digital audio broadcasting service with data information It includes service linking information indicating the broadcast station ID of the broadcast station of the audio broadcast. When it is required to switch the output from the audio output means (24) from a radio program of a digital audio broadcasting service with data information to an analog audio broadcasting with data information broadcasting the same radio program as the radio program, service linking is performed. Searches for the broadcast station ID of the analog audio broadcast with data information that is broadcasting the same radio program as the digital audio broadcast service with data information from the information, and the analog audio broadcast with data information having the found broadcast station ID The output from the audio output means (24) is switched.

The digital audio broadcast with data information and the analog audio broadcast with data information include at least DAB and RDS, respectively. The analog audio broadcast with data information particularly includes an analog audio FM broadcast with data information. The service ID of digital audio broadcasting with data information is D
The broadcast station ID of the analog audio broadcast with data information corresponds to the PI code of the RDS. The radio receiver (10) is not limited to the DAB / RDS shared car radio (10). Without being mounted on a car,
DAB / RDS used or carried at home
Includes shared radio receiver. The sound output means (24) includes not only speakers but also any sound output means for converting an electric signal into sound waves audible to the user, such as headphones and earphones.

[0007] The service linking information, which is one of the data information of digital audio broadcasting with data information, is:
Regarding the broadcasting station of digital audio broadcasting with data information and the broadcasting station of analog audio broadcasting with data information related to each other broadcasting the same radio program, the SId of the digital audio broadcasting service with data information and the analog with data information The broadcast station ID of the broadcast station of the audio broadcast is indicated. Therefore, based on the service linking information, the service of the digital audio broadcasting with data information currently being listened to and the service linking (the service between the services broadcasting the same radio program or the relationship between the service and the broadcasting station of the analog audio broadcasting with data information are provided as a service The broadcasting station ID is found, and the broadcasting station I
By selecting an analog audio broadcast with data information having a D, an analog audio broadcast with data information of the same radio program as the radio program being heard in the digital audio broadcast with data information is output as audio output means (24).
Can be output from

According to the radio receiver (10) of the present invention, if there is no service linking information for the digital audio broadcasting service with data information currently selected by the user, the user is not allowed to add the data information currently selected. Service ID of digital audio broadcasting service
The output from the audio output means (24) is switched to an analog audio broadcast with data information having the same broadcasting station ID as that of (1).

If there is no service linking information, the user does not leave the information as it is, and the same as the service ID of the digital audio broadcasting service with data information currently selected by the user (= outputting from the audio output means (24)). Broadcasting station I
An analog audio broadcast with data information having D is selected and output from the audio output means (24). This makes it possible to appropriately deal with switching from digital audio broadcasting with data information to analog audio broadcasting with data information for the same radio program. Note that digital audio broadcasts with data information and analog audio broadcasts with data information are
In the case of the service linking information of the digital audio broadcast with data information, it is guaranteed that the SId service between the service-linked SId and the PI code and the broadcasting station of the PI code are broadcasting the same radio program. On the other hand, the service linking information of the DAB does not provide service linking, and simply does not guarantee that the service of the SId having the same code and the broadcasting station of the PI code are broadcasting the same radio program.
They usually broadcast the same radio program, but rarely they are different.

[0010] According to the radio receiver (10) of the present invention, even if there is service linking information on the digital audio broadcast service with data information currently selected by the user, the user can select the data receiver with the data information currently selected. If the broadcasting station ID of the analog audio broadcasting with data information broadcasting the same radio program as the digital audio broadcasting service is not found in the service linking information, the digital broadcasting with the data currently selected by the user is performed. The output from the audio output means (24) is switched to analog audio broadcasting with data information of the same broadcasting station ID as the service ID of the audio broadcasting service.

Even if there is service linking information, the digital audio broadcasting service with data information selected by the user and the broadcasting station ID of the analog audio broadcasting with data information in the service linking cannot be found in the service linking information. is there. In such a case, do not leave it as it is, select the analog audio broadcast with data information having the same broadcasting station ID as the service ID of the digital audio broadcast with data information service currently selected by the user, and output the audio. Output from the means (24). This makes it possible to appropriately deal with switching from digital audio broadcasting with data information to analog audio broadcasting with data information for the same radio program.

According to the radio receiver (10) of the present invention, there is service linking information for the digital audio broadcasting service with data information currently selected by the user, and the digital information with data information currently selected by the user. The broadcasting station ID of the analog audio broadcasting with data information that is broadcasting the same radio program as the audio broadcasting service is found in the service linking information. If the audio data cannot be received as an audible analog audio broadcast with data information, the audio output means outputs the analog audio broadcast with data information of the same broadcasting station ID as the service ID of the digital audio broadcast with data information service currently selected by the user.
Output from (24) is switched.

"When the analog audio broadcast with data information having the broadcast station ID cannot be received as an audible analog audio broadcast with data information"
If the radio receiver (10) cannot receive an analog audio broadcast with data information having the broadcasting station ID at all, it can be received from the audio output means (24) with low electric field strength and appropriate quality even if it can be received slightly. This includes cases where it is not possible, and cases where there is no actual analog audio broadcast with data information having such a broadcasting station ID.

According to the radio receiver (10) of the present invention, the service is switched from the digital audio broadcasting service with data information to the analog audio broadcasting with data broadcasting the same radio program as the radio program. Is required when the reception state of the digital audio broadcast with data information relating to the currently selected service is deteriorated.

Whether the reception status of the digital audio broadcast with data information related to the currently selected service is deteriorating depends on whether the electric field strength of the received radio wave of the digital audio broadcast with data information is less than a predetermined value, Alternatively, it can be checked based on whether or not the code error rate is equal to or higher than a predetermined value. When the electric field strength of the received radio wave of the digital audio broadcast with data information is less than a predetermined value, and when the error rate of the code is equal to or more than the predetermined value, the reception state of the digital audio broadcast with data information is deteriorated.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a car audio 10 with a DAB / RDS shared car radio. C
Media player 12 such as D player or MD player, R
Outputs of the DS tuner section 14 and the DAB tuner section 16 are sent to a switch 18. The microcomputer 20 is connected to the volume 22 and the media player 12, R via the switch 18.
The connection between the DS tuner unit 14 and the DAB tuner unit 16 is controlled, and the output selected from the media player 12, the RDS tuner unit 14, and the DAB tuner unit 16 is sent to the volume 22. The volume 22 adjusts the volume of the sound coming out of the speaker 24, and the output of the volume 22
After being amplified by 26, it is output from the left and right speakers 24. The user's instruction to the car audio 10 is performed by a key 28, and the input of the key 28 is sent to the microcomputer 20, and the user operates the key 28 to perform a predetermined input to the microcomputer 20, Is
Various kinds of information are displayed on the display 30 to inform the user.
The memory 32 is composed of a RAM or the like, and includes a microcomputer
20 reads and writes data.

FIG. 2 is a detailed view of the RDS tuner section 14 of FIG. The RDS FM composite signal from the antenna is PL
The signal is sent to the L receiving circuit 36. In the PLL receiving circuit 36, a predetermined FM composite signal is selected, amplified, detected, and sent to the muting circuit 38. The RDS data demodulation circuit 40 extracts and demodulates a data portion from the FM composite signal selected by the PLL reception circuit 36, and outputs the demodulated data to the microcomputer 20. Microcomputer 20
Decodes the input from the RDS data demodulation circuit 40, stores it in the memory 32, and displays on the display 30 the data such as the reception frequency and the radio program name relating to the RDS being received. The reception sensitivity detection circuit 42 detects the reception sensitivity (= electric field strength of the received radio wave) of the FM reception signal selected by the PLL reception circuit 36 and outputs the detection result to the microcomputer 20. The microcomputer 20 determines, based on the input from the reception sensitivity detection circuit 42, whether or not the reception condition that the electric field strength of the reception signal is, for example, 20 dBμV or more at the S meter output and the noise level at the IF output is 5 V or less is satisfied. When the conditions are satisfied, the muting circuit 38 is deactivated, and the demodulated RDS audio signal is output to the switch 18. If the above-mentioned reception condition is not satisfied, the muting circuit 38 is activated, and the output of the RDS audio signal to the switch 18 is stopped.

FIG. 3 is a system configuration diagram of the DAB tuner section 16. The system microcomputer unit 52 and the control microcomputer unit 54 are included in the microcomputer 20 and include memory units 56 and 58 as the memory 32, respectively. The system microcomputer unit 52 transmits a plurality of ensembles (each ensemble is transmitted by radio broadcast waves modulated by DQPSK-OFDM, and one ensemble has a bandwidth of 5M
Hz, and usually includes six ensembles, ie, broadcast programs. ) Is designated, and the reception frequency data relating to the designated ensemble is sent to the RF block 60. The RF block 60 is an ensemble RF (R) designated by the system microcomputer unit 52.
audio frequency) and sends it to the demodulation block 62. In the demodulation block 62, the system microcomputer section
RF block 60 based on demodulation start data information from 52
, And outputs the demodulated RF signal to the channel decoding block 64. The channel decoding block 64 decodes the demodulated signal from the demodulation block 62 based on the reception mode data and the decoded channel separation data from the system microcomputer unit 52, and performs FIC (Fast Information).
Channel. FIG to be described later is included in the FIC. )
Data other than audio, such as data and error rate data (representing a bit error rate), is output to the system microcomputer unit 52, and the decoded audio information is output to the audio decoding block 66. The audio decoding block 66 sends the MPEG header data, the MPEG error data, and the PAD (Pr
The audio information of a predetermined service is selected from the input from the channel decoding block 64 based on the OGM (Associated Data) and output as sound.

FIG. 4 is a diagram showing F included in a DAB transmission frame.
It is a structural diagram of a type 0 area of IG0 / 6. 0 is FIG
And 6 indicates Extension. DA
The communication protocol of various elements of DAB such as the transmission frame of B is well known, and details are described in European Telecommunication Standards Association (European Telec).
Ommunication Standards In
European Telecommunications Standard (European Telecommunication)
cases Standard).
FIG0 / 6 presents service linking information. The extension type 0 area further includes a plurality of service linking (Service l).
Inking). LA (Linkage Act)
uator: linkage actuator) = 0 indicates that this link is currently inactive or a future link, and LA = 1 indicates that this link is currently active. EG = 0 means that the set of linked services is non-generic, EG = 1
Means that a set of linked services is generic (gen
eric). SId (= Service Ident) between services of a set of generics
ifier: A service that makes services distinguishable from each other. )
Are the same except for the service type (= service coverage area). SId is the RDS PI
Code (Program Identificat)
If the same service company has both RDS and DAB, the PI code in the RDS of that service company and the SId in DAB are generally the same and sometimes different. I
LS (International Linkage)
(Set indicator) = 0 means that the link is valid only in one country, and ILS = 1 means that the link is valid internationally. Id list flag =
0 is an Id list (Id list), Rfu (res
and the number of Id (Number of Ids), and = 1 means the number of Id list, Rfu and Id. LSN (Linkage set
Number) represents a number common to all services linked as a set. The number of Id indicates the number of SId in the id list. The Id list is Id (Ideti
fire of Service) and ECC (Ext
end country code),
Id indicates each service by SId, and ECC indicates the country to which the service belongs.

For example, BCD in the UK is a service company of DAB and a broadcasting company of RDS.
“C221” is assigned as the SId of AB and “C201” is assigned as the PI code of RDS. BBC,
If the same radio program that is currently being broadcast in DAB is also being broadcast in RDS, FIG.
LA = 1 of 0/6, Id list flag = 1, and “C221” and “C201” are, for example, id1 and id
2 is described.

FIG. 5 shows D for the radio program currently being listened to.
9 is a flowchart of a program for switching from AB to RDS. In S70, it is determined whether or not automatic switching from DAB to RDS has been started, and the determination is Yes.
If so, the process proceeds to S71, and if No, the program ends. In S71, the presence or absence of service linking (the presence of service linking means that FIG0 / 6 exists,
(LA = 1) is detected, and if there is, the process proceeds to S72, and if not, the process proceeds to S77. In S72, the Id of FIG0 / 6
It is determined whether the list includes the SId of the service currently being listened to. If the determination is Yes, the process proceeds to S73. If the determination is No, the process proceeds to S77. In S73, Id
Search the list for the PI code of the RDS that is linking with the SId of the service currently being listened to (strictly speaking, this PI code is RD
It is shown as the SId of the DAB's linking service rather than the PI code of the S, and the PDS of the RDS
Not an I-code search. However, P of Sid and RDS
The I code is usually the same, and the PI code of the RDS is considered to be the same as the Sid, and the PI code is indirectly searched from the search for Sid. ). In S74, PI
It is determined whether the code has been retrieved. If the determination is Yes, the process proceeds to S75, and if No, the process proceeds to S77. S
At 75, the P that matches the PI code found by the search
The RDS of the I code is searched in the RDS tuner unit 14. In S76, it is determined whether or not the RDS is found in the search in S75. If the determination is Yes, the process proceeds to S80, and if No, the process proceeds to S77. In S77, the RDS tuner unit 14 searches the RDS tuner unit 14 for an RDS having the same PI code as the SId of the service the user is currently listening to from the speaker 24. In S78, it is determined whether or not an RDS station is actually found as a result of the search in S77.
If s, the process proceeds to S80, and if No, the process proceeds to S79. In S79, the automatic switching from DAB to RDS is restarted, and the program ends. In S80, S75
Alternatively, the radio program of the RDS station found in S77 is output from the speaker 24.

[Brief description of the drawings]

FIG. 1 is a block diagram of a car audio with a DAB / RDS shared car radio.

FIG. 2 is a detailed view of an RDS tuner unit of FIG.

FIG. 3 is a system configuration diagram of a DAB tuner unit.

FIG. 4 shows FIG0 / 6 included in a DAB transmission frame.
FIG. 3 is a structural diagram of a type 0 region of FIG.

FIG. 5 is a flowchart of a program for switching a currently listened radio program from DAB to RDS.

[Explanation of symbols]

 10 DAB / RDS shared receiver (radio receiver) 24 speaker (audio output means)

Claims (5)

[Claims] 1. An analog audio broadcast with data information includes a broadcasting station ID as data information, and a digital audio broadcast with data information includes
For the digital audio broadcasting service with data information and the broadcasting station of analog audio broadcasting with data information related to each other that are broadcasting the same radio program, the SId and the analog with data information for the digital audio broadcasting service with data information A radio receiver (10) including service linking information indicating a broadcast station ID of a broadcast station of the audio broadcast and capable of receiving the analog audio broadcast with data information and the digital audio broadcast with data information; When it is required to switch the output from the audio output means (24) from a broadcast service radio program to an analog audio broadcast with data information that broadcasts the same radio program as the radio program, the data information is added from the service linking information. Searching for a broadcast station ID of an analog audio broadcast with data information broadcasting the same radio program as a digital audio broadcast service radio program, and outputting the audio output means to an analog audio broadcast with data information having the found broadcast station ID; A radio receiver characterized in that the output from (24) is switched. 2. When there is no service linking information for the digital audio broadcasting service with data information currently selected by the user, the same service ID as the service ID of the digital audio broadcasting service with data information currently selected by the user. 2. A radio receiver according to claim 1, wherein an output from said audio output means is switched to an analog audio broadcast with data information having a broadcast station ID. 3. Even if service linking information about a digital audio broadcasting service with data information currently selected by the user exists, the same radio program as that of the digital audio broadcasting service with data information currently selected by the user is provided. If the broadcast station ID of the analog audio broadcast with data information broadcasting the radio program is not found in the service linking information, the same broadcast ID as the service ID of the digital audio broadcast with data information currently selected by the user is used. The audio output means to an analog audio broadcast with data information of station ID (24)
3. The radio receiver according to claim 2, wherein the output from the radio receiver is switched. 4. There is service linking information on a digital audio broadcasting service with data information currently selected by the user, and the same radio program as that of the digital audio broadcasting service with data information currently selected by the user. The broadcasting station ID of the analog audio broadcasting with data information broadcasting is found in the service linking information, but the analog audio broadcasting with data information having the broadcasting station ID becomes an analog audio broadcasting with audible data information. If reception is not possible, the output from the audio output means (24) is switched to an analog audio broadcast with data information of the same broadcasting station ID as the service ID of the digital audio broadcast with data information currently selected by the user. The feature is that Radio receiver according to claim 3. 5. When a service switching is required from a radio program of a digital audio broadcasting service with data information to an analog audio broadcasting with data information broadcasting the same radio program as the radio program, the currently selected radio program is selected. The radio receiver according to any one of claims 1 to 4, wherein the reception state of the digital audio broadcast with data information related to the service is deteriorated.