JPH11312993A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the setting of the type of programs which cannot be listened to a receiver by discriminating whether the programs can be actually selected (supported) or not at the time of setting the type of these programs desired to listen. SOLUTION: When a PTY search is started, it is retrieved whether a service next to the current service coincides with a designated PTY or not. Then, it is discriminated whether the order of a service id out of information of a next selected ensemble coincides with the PTY designated as of the leading service or not and if they coincide, the sounds of a component set as the primary are reproduced. If they don't coincide, PTY comparison is performed for the next service in the same manner. If the designated PTY is not found even when the retrieval is advanced up to the front of the last service by one, the error is displayed, and the last service is selected and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver, and more particularly to a digital audio broadcast receiver which is already in practical use in Europe.
ng; hereinafter, referred to as DAB).

[0002]

2. Description of the Related Art As a system for transmitting and receiving a broadcast wave having a data signal of a predetermined format including a digital audio signal, a European standard (Eureka 14) is used.
There is a DAB system conforming to 7). In such a system, one ensemble is composed of a plurality of services, and each service is composed of a plurality of components such as English and German. Therefore, the user can obtain information on a plurality of services and components by selecting a certain ensemble, and can instantaneously switch to different services and components.

One use of a DAB receiver for receiving this broadcast is to utilize a PTY (Programme Type) search which is also adopted as a channel selection function in an RDS receiver or the like. In the DAB, similarly to the RDS, identification information indicating the type of service is transmitted as digital data together with voice information, so that a desired service is selected.
It becomes possible to receive.

[Problems to be solved by the invention]

However, in the conventional PTY search,
Only after actually starting the search could it be determined whether the designated PTY could be selected. Therefore, for example, even when the user specifies a PTY that cannot be selected in the current ensemble, the fact that the search start is actually instructed by the user, in other words, that the PTY search has not been started, is noticed. There was a problem that can not be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. In the process of setting the contents of a program that a user desires to listen to, the user can actually select the program (possibility of selection). It is an object of the present invention to provide a digital broadcast receiver capable of distinguishing whether or not there is.

[0006]

According to the first aspect of the present invention, a digital audio broadcast for transmitting program type identification information for identifying a type of a program as a digital signal together with audio information of the program is received. A digital broadcast receiver, comprising: a discriminating unit that discriminates at least a type of a program that can be selected in an ensemble currently being received based on the received program type identification information; and a notifying unit that notifies a discrimination result of the discriminating unit. It is characterized by having.

According to a second aspect of the present invention, in the digital broadcast receiver according to the first aspect, the notifying means comprises:
A selection unit for selecting a desired program type from a plurality of program types is further provided, and the determination result on the program type selected by the selection unit is notified.

According to a third aspect of the present invention, in the digital broadcast receiver according to the second aspect, the audio information of the type of the program selected by the selection means is output.

According to a fourth aspect of the present invention, there is provided a digital broadcast receiver for receiving a digital audio broadcast for transmitting identification information for identifying a type of a program supported in a service as a digital signal. A determination unit configured to determine at least a type of a program supported by the currently selected service based on the received identification information, and a notification unit configured to notify a determination result of the determination unit.

According to a fifth aspect of the present invention, in the digital broadcast receiver according to the fourth aspect, the notifying means comprises:
A selection unit for selecting a desired program type from a plurality of program types is further provided, and a determination result on the program type selected by the selection unit is notified.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a DAB receiver according to one embodiment of the present invention. The DAB receiver includes a DAB receiving unit 1, a DAB control unit 2, a system control unit 3, a display unit 4, a key input unit 5, an amplifier 6,
And a speaker 7.

The DAB receiving section 1 transmits the transmitted OFDM signal.
It includes an FFT (Fast Fourier Transform) unit for demodulating waves, a Viterbi decoding unit for error correction, and an audio decoder for restoring compressed audio data to original audio data. And is not described in detail here.

The DAB control section 2 controls the DAB receiving section 1 and also controls the FIC demodulated by the DAB receiving section 1.
(Fast Information Channel: high-speed information channel) is read. Such information includes:
PTY information used in this case and A for interrupt control
su (Announcement Support), Asw (Announcement
switching) information.

The DAB control unit 2 transmits necessary information to the system control unit 3 in response to a request from the system control unit 3. Such information includes information on a selectable PTY, as described later.

The system control unit 3 controls the entire receiver. Specifically, corresponding control is performed based on input information from key input unit 5. For example, control of the volume of the amplifier 6 or up / down of the frequency corresponds to this.
Further, information transmitted from the DAB control unit 2 is also input to the system control unit 3. Also, the system control unit 3
Is responsible for controlling the display unit 4 and outputs display information to the display unit 4. The above is the outline of the DAB receiver.

First embodiment. Next, the operation of the system control unit 3 according to the present invention will be described in detail. FIG. 2 is a flowchart showing the operation of the system control unit 3 in the PTY setting mode of the present invention. Note that this flowchart is executed when the PTY search setting mode is designated from the key input unit 5.

When the user designates the PTY search setting mode from the key input unit 5, Yes in step S1.
First, a plurality of Ps specified in DAB broadcasting
One of the TYs is selected and displayed on the display unit 4 as a set PTY.

Next, the system control unit 3 determines whether or not the displayed setting PTY can be selected in the currently received ensemble (step S3). Specifically, information about the PTY of each service in the ensemble is obtained from the FIC of the current ensemble received by the DAB receiving unit 2,
Such information is transmitted to the system controller 3 via the DAB controller 2.
Supplied to Based on this information, the system control unit 3 determines in advance which PTY can be selected in the currently received ensemble before executing this flowchart, and confirms this information for the set PTY. . The PTY of the service currently being received (current service) is not considered because it is excluded from the PTY search.

If it is determined that the current ensemble can be selected, a message indicating that the set PTY is selectable is displayed on the display unit 4 in step S4. As the display mode, a mode in which the setting PTY being displayed is blinked, or an indicator is arranged near the displayed setting PTY and is lit up can be used.

On the other hand, if it is determined that the current ensemble cannot be selected, a message indicating that the set PTY cannot be selected is displayed on the display unit 4 in step S8. As this display mode, it is possible to use a mode in which the setting PTY being displayed is blinked, or an indicator is arranged near the displayed setting PTY and is lit. Further, it is also possible to delete step S8 and notify the user by display only when reception is possible.

After the display in steps S4 and S8, the system control unit 3 determines whether or not the user has issued a command to change the set PTY. Such a change command is also input via the key input unit 5.

When the change command is input, the system control unit 3 returns to step S2, selects another one of the PTYs defined in the DAB broadcast, and sets this to the set PT.
Y is displayed on the display unit 4.

By the loop of steps S2 to S5, the user can sequentially switch the set PTY. At this time, whether or not selection is possible in steps S4 and S8 is displayed to the user. Will be announced. Therefore, the user determines whether or not the desired PTY can be selected.
It is possible to know in advance without actually performing the TY search. In the present flowchart, the PTY that can be selected in the currently received ensemble is configured to be determined before executing this flowchart. However, the set PTY is displayed in step S2. It is also possible to configure so as to make such a determination later.

If the command to change the set PTY is not input in step S5, the system control unit 3 proceeds to step S6.
It is determined whether or not the PTY search start command has been input. When the search start is input from the key input unit 5, in step S7, the P for the determined PTY determined in the processing of steps S1 to S5 is determined.
A TY search is performed, a service having a corresponding PTY is selected, and output from the speaker 7.

On the other hand, in step S6, if an input indicating that the PTY search is not to be performed is made from the key input unit 5, the PTY search process in step S7 is not executed, and the PTY search is not performed.
Exit the mode from the search setting mode. Therefore,
PT desired in the processing of steps S1 to S5
If it is found that Y cannot be selected, the user can return to the normal reception mode by inputting via the key input section 5 an input indicating that there is no need to perform a PTY search. .

When it is determined in step S1 that the PTY search setting mode is not selected, the normal reception mode is continued.

Next, the PTY search performed in step S7 will be described. FIG. 4 is a diagram showing a state transition of the PTY search. Here, the case where the process of FIG. 2 is performed while a certain service is selected and the PTY search key is pressed will be described as an example.

When the PTY search key is pressed, step S6 in FIG. 2 becomes Yes, and the PTY search is executed. Specifically, as shown in step S102a, a search is first made to determine whether the PTY of the service next to the current service matches the designated PTY. If the PTY matches, the service is selected in step S107, and the
At 108, the sound of the component set as the primary is reproduced and output from the speaker 7.

If it is determined in step S102a that the PTYs do not match, the same applies to the next service.
TY is compared (step 102b). If the PTY matches, the service is selected in step S107 as described above, and the primary component is reproduced in step S108. When a search is executed for a PTY displayed as selectable in FIG. 2, the desired PTY is selected and reproduced by repeating such processing.

In step S102n, the last service (the service selected at the start of the PTY search)
If it is determined that the specified PTY is not found even if the search has proceeded to the previous service (this is the case when an instruction to search for a PTY displayed as unselectable in FIG. 2 is issued), the current ensemble Since there is no receivable service in D, search for the next ensemble
It instructs the AB control unit 2 to change the frequency. The DAB control unit 2 receives the command and controls the DAB receiving unit 1 so as to receive the next ensemble, and obtains information about the next ensemble determined to be receivable through the channel selection process from the FIC.

Next, it is determined whether or not the order of SId (Service Identifier) in the obtained information of the next ensemble matches the designated PTY for the first service (step S104). If the PTY matches, the service is selected in step S107, the sound of the component set as primary is reproduced in step S108, and this is output from the speaker 7.

If it is determined in step S104 that the PTYs do not match, the same applies to the next service.
Y is compared (step S102b). If the PTY matches, the service is selected in step S107 as described above, and the primary component is reproduced in step S108. Last service (in this case, SId
(The first service), the specified PTY is not found even if the search proceeds to the service immediately before (step S1).
02n; none), the same process is performed for the next ensemble.

If the desired PTY is not obtained even after searching the entire receiving band, an "error display" indicating this is displayed.
Is displayed on the display unit 4 (step S105), and the last service (the service selected at the start of the PTY search) is selected and reproduced from the speaker 7.

FIG. 5 is a diagram showing a state of the search by the PTY search processing shown in FIG. In FIG. 5, it is assumed that there are two receivable ensembles in the reception band (each having three services), and the secondary (2ndary) component in the service 2 of the ensemble 1 is currently being selectively reproduced. I have.

When the PTY search starts, first, it is searched whether or not the service next to the current service (service 3 in ensemble 1) matches the designated PTY.
If Y matches, the primary component is played.

If the specified PTY is not found even if the search has proceeded to the service (service 1 in the ensemble 1) immediately preceding the last service (the service 2 in the ensemble 1), the DAB control unit 2 searches the next ensemble for the frequency. To change

Next, it is determined whether the order of SId in the information of the selected next ensemble (ensemble 2) matches the designated PTY for the first service (service 1). If the PTY matches, the sound of the component set as primary is played.

If it is determined that the PTYs do not match,
The PTY is similarly compared for the next service, and the specified PTY is not found even if the search progresses to the service immediately before the last service (service 1 during search for a different ensemble) (service 3 in ensemble 2). In this case, since the entire reception band has been searched, an error display is displayed on the display unit 4 and the last service (secondary service of the service 2 of the ensemble 1) is selectively reproduced.

Second Embodiment In the first embodiment, the PT encoded in the type 17 of the transmission format defined by the DAB (extension 17 of type 0) is used.
Although Y is used, a second embodiment shown below uses Asu. Asu is coded as type 18 (extension 18 of type 0), and is information included in the FIC like PTY. As
u statically indicates an announcement supported by the service, and the DAB standardizes such an announcement type as an alarm (Alarm) and a load traffic flash (RoadTraffic Frash).

Therefore, by using such information, for example, the receiver can be configured so as to know whether or not the currently selected service supports the announcement type desired by the user.

FIG. 3 is a flowchart showing the operation of the system control section 3 in the announcement type setting mode of the present invention.

When the announcement type setting mode is designated by the user from the key input unit 5, step S1 is performed.
In step S1, the answer is Yes. First, one of the announcement types specified in the DAB broadcast is selected and displayed on the display unit 4 as the set announcement type (step S12).

Next, the system control unit 3 determines whether the displayed set announcement type is supported by the currently selected service (step S1).
3). Specifically, information about the announcement type supported by each service in the ensemble from the FIC of the current ensemble received by the DAB receiving unit 2 is A
The information is obtained as su information and supplied to the system control unit 3 via the DAB control unit 2. The system control unit 3 determines whether the set announcement type is supported by the currently selected service based on this information.

If it is determined that the service is supported by the current service, a message indicating that the set announcement type is supported is displayed on the display unit 4 in step S14. As a display mode, a mode in which a setting announcement type being displayed is blinked, or an indicator is arranged near the displayed setting announcement type and is lit up can be used.

On the other hand, if it is determined that the service is not supported by the current service, a message indicating that the set announcement type cannot be received is displayed on the display unit 4 in step S18. As this display mode, a mode in which the setting announcement type being displayed is blinked, or an indicator is arranged near the displayed setting announcement type and is lit up can be used. Also,
It is also possible to delete step S18 and notify the user by display only when supported.

After the display in steps S14 and S18, the system control unit 3 determines whether or not the user has issued a command to change the set announcement type (step S15). Such a change command is also input via the key input unit 5.

When the change command is input, the system control unit 3 returns to step S12, selects another one of the announcement types specified in the DAB broadcast, and sets this to the set announcement type. Display section 4 as
To be displayed.

The above steps S12 to S15
The user can sequentially switch the set announcement type by the loop of step S1.
4. In step S18, the user is notified by a display whether or not the announcement type is supported. Therefore, the user can know in advance whether or not the desired announcement type is supported before confirming the setting.

If the command to change the set announcement type is not input in step S15, the system control unit 3 determines whether or not to set the announcement type in the receiver in step S16. Key input section 5
If an input indicating a setting instruction has been made, step S1
In step 7, the announcement type selected in the processing of steps S11 to S15 is set as a confirmed announcement type in the receiver.

On the other hand, in step S16, the key input unit 5
If no further input indicating a setting instruction is made, step S
The setting process of No. 17 is not executed, and the mode is out of the announcement type setting mode and returns to the normal reception mode. Therefore, when it is found that the desired announcement type is not available in the processing of steps S11 to S15, the user temporarily exits this setting mode, and then selects a different service. By executing the same processing again with the newly selected service, it becomes possible to set a desired announcement type in the receiver.

When it is determined in step S11 that the announcement type setting mode has not been selected, the normal reception mode is continued.

In the present embodiment, the display is used as the notification means, but the notification by voice synthesis can be processed in the same manner. In that case, what is described as the display in the flowcharts of FIGS. 2 and 3 may be replaced with audio output.

In the present embodiment, an example in which the user sets one PTY and an announcement type has been described. However, the present invention is not limited to this. For example, a configuration may be used in which a plurality of announcement types are set. It is also possible. In this case, in FIG. 3, steps S16 and S17
May be brought before step S15, and in FIG. 2, a configuration corresponding to steps S16 and S17 in FIG. 3 may be added before step S5.

Further, step S1 of the second embodiment
3, the currently selected service is used as a reference. However, the present invention is not limited to this. As in the first embodiment, the currently received ensemble may be used as a reference, and in addition, the same network as the currently received ensemble may be used. Other ensembles can also be considered. Similarly, in step S3 of the first embodiment, in addition to the currently received ensemble, another ensemble of the same network as the currently received ensemble can be considered.

[0055]

As described above, according to the present invention,
When setting the program type desired to be listened to, it is possible to identify whether or not such a program can be actually selected (supported), so that the user sets a program type that is unlikely to be heard in the receiver. Disappears.

[Brief description of the drawings]

FIG. 1 is a block diagram of a DAB receiver according to the present invention.

FIG. 2 is a flowchart executed by a system control unit.

FIG. 3 is a flowchart executed by a system control unit.

FIG. 4 is a state transition diagram of a PTY search.

FIG. 5 is a diagram showing a search order of a PTY search.

[Explanation of symbols]

 1 DAB receiving unit 2 DAB control unit 3 System control unit 4 Display unit 5 Key input unit 6 AMP 7 Speaker

Claims (5)

[Claims] 1. A digital broadcast receiver for receiving a digital audio broadcast for transmitting program type identification information for identifying a type of a program together with audio information of the program as a digital signal, the digital broadcast receiver comprising: A digital broadcast receiver comprising: a discriminating unit that discriminates at least a type of a program that can be selected in an ensemble currently being received based on information; and a notifying unit that notifies a discrimination result of the discriminating unit. 2. The system according to claim 1, wherein the notifying unit further includes a selecting unit for selecting a desired program type from a plurality of program types, and the determination result regarding the program type selected by the selecting unit is provided. Claim 1
Digital broadcast receiver as described. 3. The digital broadcast receiver according to claim 2, wherein said audio information of the type of the program selected by said selection means is output. 4. A digital broadcast receiver for receiving a digital audio broadcast for transmitting identification information for identifying a type of a program supported in a service as a digital signal, based on the received identification information. A digital broadcast receiver comprising: at least a discriminating means for discriminating a type of a program supported by a currently selected service; and a notifying means for notifying a discrimination result of the discriminating means. 5. The notifying means further comprises a selecting means for selecting a desired program type from a plurality of program types, and the discriminating result on the program type selected by the selecting means is provided. The digital broadcast receiver according to claim 4, wherein the notification is performed.