JP3538062B2 - Digital broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a DAB (Dig)
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving a digital broadcast such as ital Audio Broadcasting, and more particularly to a digital broadcast receiver in which an interruption of a service component of an interruption audio is improved.

[0002]

2. Description of the Related Art DAB includes an interrupt audio service component. Types of interrupt audio service components include alarms and road traffic.

[0003]

The service component of the DAB interrupt audio is broadcast in various languages. However, in the conventional DAB radio receiver, if the service component of the interrupt audio is broadcast, Regardless of the language, service components such as music that had been sound output from the speaker until now were interrupted,
The interruption of outputting the audio of the interruption audio from the speaker was performed. However, for each user, there are also audio service components for interrupts in a language that cannot be understood, and those interrupts are meaningless.

An object of the present invention is to provide a digital broadcast receiver which can overcome the above-mentioned problems.

[0005]

According to the digital broadcast receiver (10) of the present invention, one digital broadcast includes a plurality of service components, and the audio service component selected by the user is output to the audio output means ( 20)
During the output, when an interrupt audio service component is received, the audio output from the audio output means (20) is switched to the received interrupt audio service component. In the digital broadcast receiver (10), switching of the audio output from the audio output means (20) is permitted only for the interrupt audio service component in the same language as the set language.

Digital broadcasting includes both digital radio broadcasting and digital television broadcasting. Therefore, the digital broadcast receiver (10) includes a digital radio broadcast receiver and a digital broadcast receiver. It is also assumed that digital radio broadcasting includes at least DAB.

The digital broadcast receiver (10) is not limited to an in-vehicle digital broadcast receiver, but includes a portable digital broadcast receiver and a stationary digital broadcast receiver. One digital broadcast including a plurality of service components corresponds to an ensemble in DAB. For example, the service component language of the interrupt audio in DAB is English, French, German, Italian, and the like. In digital broadcasting such as DAB, the language of each service component is included as information, and the language of each service component can be detected by referring to this information. The audio output means (20) includes not only speakers but also headphones.

In a typical DAB radio receiver (10), there is only one tuner. In this case, only a service component of an interrupt audio in a digital broadcast (called an ensemble in DAB) selected by the tuner is used. However, reception may not be detected, but by providing a plurality of tuners, reception of another ensemble audio service component for interruption may be detected and interruption of the service component may be enabled.

Thus, the user does not hear the interrupt audio service component in a language that is useless to hear (for example, cannot understand even if heard), but does not listen to the interrupt audio service in a meaningful (eg, understandable) language. You can only listen to service components.

According to the digital broadcast receiver (10) of the present invention, one or a plurality of set languages can be set according to user settings.
It is set in advance.

According to the language setting by the user in advance,
Thereafter, the service component of the audio for interruption of the set language can be heard from the audio output means (20).

[0012] According to the digital broadcast receiver (10) of the present invention, the set language is set to the same language as the audio service component currently being output as audio from the audio output means (20). ing.

The user usually selects a talk program or the like in a language that he or she can understand. Therefore, by detecting the language of the audio service component currently being audio-output from the audio output means (20) and selecting the interrupt audio service component of the same language, the interrupt of the language understandable by the user is detected. The service component of the audio for use can be output from the audio output means (20), and it is possible to save the trouble of setting each set language in advance of userization.

According to the digital broadcast receiver (10) of the present invention, the service component of the interrupt audio that permits the switching of the audio output from the audio output means (20) is limited to the same language as the set language. It is possible to freely select whether or not it is limited by user setting.

[0015] Voice output means to the service component
The user of the digital broadcast receiver (10) can select the language in which the audio output from (20) is allowed to be switched to or from the set language by user setting. Only the audio service component can be interrupted, or the interrupt audio service component for all languages can be interrupted.

According to the digital broadcast receiver (10) of the present invention, the setting language can be set for each type of service component of the interrupt audio.

For example, in DAB, an emergency alarm (A
alarm), Road Traffic Report (Road Traffic)
flash), bulletin of transport (Transport)
flash), predictive warning / service (Warning /
Service), breaking news (News flash)
h), Regional weather report (Area weather fl)
ash), event announcement (Event announcem)
ent) and special cases (Special even)
t).

The user can set the language of the interrupt audio service component that allows an interrupt for each type of the interrupt audio service component, so that an urgent notice or the like can be obtained if the language is not known even though the language is somewhat unknown. The service component of the interrupting audio of the type that does not need to be leaked from the audio output means (20), and even if the listening is delayed a little,
Only interrupt audio service components of a type that are meaningless unless heard in a language that is fully understood,
By waiting until the interrupt audio service component of the language is broadcast, an appropriate response to the interrupt audio service component can be taken.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. Hereinafter, in FIGS. 1 to 5,
The communication protocol of various elements of the DAB such as a transmission frame is appropriately described. For details, see the European Telecommunications Standards Association (European Telec).
ommunications Standards
European Telecommunications Standard (European Telecommunication)
nations Standards).

FIG. 1 shows the structure of a DAB transmission frame. Transmission frame (Transmission fra
me) are the synchronization channel and FIC (Fast)
Information Channel: First Information Channel) and MSC (Mai)
n Service Channel (main service channel). FIC has more than one FI
B (Fast Information Block)
The MSC further comprises a plurality of CIFs (Commo).
n Interleaved Frame).
The DAB has specifications determined from mode 1 to mode 4, and the transmission frame time (dura) is set for each mode.
) and the number of FIBs and CIFs in one transmission frame are different. For example, in mode 1, the time of one transmission frame is 96 ms, and the numbers of FIBs and CIFs in one transmission frame are 12 and 4, respectively.

FIG. 2 is a view showing an example of the DAB service structure. The user accesses each service component by selecting a service. Multiple services can be accessed by one ensemble, each service having one or more service components.
The underlying service component of each service is called a primary service component. The primary service component is typically a program service as audio, but may be a data service. Ensemble whose ensemble label (name of ensemble) is DAB ENSEMBLE ONE has a service label of Alpha 1 Radio (ALPHA1 RADIUS).
O), beta radio (BETA RADIO), and alpha2 radio (ALPHA2 RADIO).

The alpha 1 radio has a primary (pri
service component (Service)
components) and one secondary (sec)
and service components of the same (only) service component. The primary service component is audio, and the secondary service component is a traffic message channel: TMC.
(Traffic Message Channel) and service information: SI (Service Information)
). Audio components and SI are transmitted on separate sub-channels (SubCh) in the MSC,
Is FIDC (Fast Information) in FIIC
on Data Channel).

Beta radio has two service components. Audio and secondary audio (second
audio component), both of which are carried on the sub-channels of the MSC.

The alpha 2 radio has the same TMC and SI as the alpha 1 radio, and the audio may be the same as the alpha 1 radio depending on the switching of the switch.

FIG. 3 is a structural diagram of the FIB. FIB,
FIB of the leading 30 bytes consisting of 256 bits in total
B data area (FIB data field) and rear 16-bit CRC (Cyclic Redunda)
ncy Check word). The FIB data area further includes a plurality of FIG (Fas
t Information Group), one end marker (Endmarker), and one padding (filling the remaining bits with 0s to fit the FIB data area to bytes). The FIG part is a useful data area (useful data view).
ld). Each FIG is, in order from the beginning, a FIG type, a Length (length: represents a bit length of a subsequent FIG data area), and a FIG data area (FIG.
data field). Fig type and Le
ngth forms a FIG header.

FIG. 4 is a structural diagram of the FIG data area of FIG. 3 in which the FIG type is 0 (000 in 3-bit binary notation). The FIG data area further stores C / N
(Current / Next), OE (Other E)
nsemble), P / D (Programme / Da)
ta), Extension, Type 0 area (Type
0 field). Extension is 1 to 4
And 7, when C / N = 0, it means the current multiplex structure, and when C / N = 1, it means the next multiplex structure. Also, C / N =
When it is 1, it means that the type 0 area is related to the following arrangement. Extension is 6, 9, 11, 1
In the case of 8, 21, 22, 23, 24, 25, 27, and 30, C / N indicates the version number of the type 0 area.
OE is Extension = 12, 16, 17, 21,
24, 30 are used, and OE = 0 indicates this type 0
The information of the area means that it is related to this ensemble, and OE = 1 means that it is related to another ensemble. P / D = 1 is the SId of the type 0 area
Is the 16-bit SId used for program services
And P / D = 0 indicates that S in the type 0 area
Id is the 32-bit Sid used for data service
It means that This P / D is Extension
Are 2, 9, 23 and 24, and when not used, SId is in 16-bit format.

FIG. 5 is a structural diagram of FIG. It is to be noted that each FIG is represented as FIG0 / 5 by a FIG type and an Extension. The type 0 area includes a plurality of service component languages (Service
e component language). 1 at the beginning of each service component
The bit is an L / S flag (L / S flag). Depending on whether the L / S flag is 0 or 1, the service component language is divided into a short format and a long format. The MSC / FIC flag in short format, when it is 0 and 1, indicates that this service component is on the MSC and FIC, respectively. From the data of the short-form sub-channel Id / FIDCId, the Id of the sub-channel or FIDC carrying this service component is found. Further, from the data of the long-form sub-channel Id, the Id of the sub-channel on which the service component is mounted is found. Then, the language of the service component is found from the language (Language) data.

FIG. 6 is a block diagram of the car audio 10. A plurality of DAB radio waves transmitted from each broadcasting station are received by the antenna 13 and are transmitted via the antenna 13 to the DAB.
Input to the tuner 14. The DAB tuner 14 selects an ensemble related to the service component selected by the user from the plurality of DAB signals input from the antenna 13 and sends the selected ensemble to the A / D converter 15. DAB is orthogonal frequency division multiplexing QPSK (Quadrature Ph).
A / D converter 15 receives a DAB OFDM signal from a DAB tuner 14, converts the signal from analog to digital, outputs the signal to a DSP 16, and outputs the signal to a DSP 16. The signal is subjected to fast Fourier transform (FFT), parallel-serial conversion, and converted into demodulated data in the DSP 16. DAB is CR
C (Cyclic Redundancy Chec)
k) and Vierbi correction check, and the DSP 16 corrects any error in the decoded code of the demodulated data, and generates a digital audio stream based on the correction code. And then D /
Output to the A converter 17. The D / A converter 17 converts the digital signal input from the DSP 16 into an analog signal and sends the analog signal to the speaker 20, from which the service component selected by the user is output. The user has D
The operation of the AB radio 11 is performed by a key operation from the operation unit 19, and the CPU 18 transmits a user operation to the operation unit 19
, And transmits and receives predetermined data and control signals to and from the DSP 16. The reception and service language of the interrupt audio service component is detected in the CPU 18 by an input signal from the 16.

FIG. 7 shows an interrupt service component (=
It is a flowchart of the processing process of setting the language of the service component of the interruption audio). This process starts when the user selects the language setting mode of the interrupt service component. Although the process of FIG. 7 is only a new language setting, in the language setting mode, not only a new language setting but also deletion, change, addition, etc. of a once set language can be appropriately performed. In S30, the language of the interrupt service component is input as desired by the user through the user operation on the operation unit 19. This language is not limited to one language, and a plurality of languages can be input. In S31, one or a plurality of languages input by the user in S30 are written in a predetermined memory.

FIG. 8 is a flowchart of an interrupt process when an interrupt service component is received. The speaker 20 outputs the audio of the audio service component currently selected by the user (usually the primary service component). When an interrupt service component is received, it is detected in CPU 18 and the interrupt flag is set (meaning interrupt flag = 1). In the DAB car radio 10, the CPU 18 can detect only the service component in the ensemble to which the service component to which the user has selected the service component and the sound is flowing from the speaker 20 belongs.
The interrupt service components that are known to be received are limited to the interrupt service components in the same ensemble as the ensemble to which the service component that the user has selected and the sound of which is being played from the speaker 20 belongs. In S37, it is determined whether the interrupt flag is in the set state or the reset state, that is, whether the interrupt flag is 1 or 0. If the interrupt flag is 1, the interrupt process is terminated, and if the interrupt flag is 0, If S38
Proceed to. In S38, FIG0 / 5 is checked, and the language of the interrupt service component received this time is detected (hereinafter, the detected language is referred to as "detected language"). S3
In S9, the set language is read from the memory in which the user's set language is written in S31 of FIG. 7, and it is determined whether or not the detected language matches the set language. S
If the determination at step 39 is YES, the process proceeds to step S40, where the received interrupt service component is
The audio program being interrupted from 20 is interrupted, that is, the audio output from the speaker 20 is switched from the service component up to now to the DAB radio receiver (10). S
If the determination at 39 is NO, the process proceeds to S41, where the interrupt of the received interrupt service component is stopped, and the audio output of the service component that has been flowing from the speaker 20 is continued. Thus, only the interrupt service component of the language set by the user in advance is interrupted.

[Brief description of the drawings]

FIG. 1 is a diagram showing the structure of a DAB transmission frame.

FIG. 2 is an exemplary diagram of a DAB service structure;

FIG. 3 is a structural diagram of an FIB.

FIG. 4 is a structural diagram of a FIG data area of FIG. 0 of FIG. 3;

FIG. 5 is a structural diagram of FIG0 / 5.

FIG. 6 is a block diagram of a car audio.

FIG. 7 is a flowchart of a process for setting a language of an interrupt service component.

FIG. 8 is a flowchart of an interrupt process when an interrupt service component is received.

[Explanation of symbols]

10 DAB Car Radio (Digital Broadcast Receiver) 20 speakers (voice output means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/06-1/16 H03J 7/18 H04H 1/00

Claims (4)

(57) [Claims] A digital broadcast includes a plurality of service components, and when an audio service component selected by a user is being output from an audio output means (20), an interrupt audio service component is received. The audio output from the audio output means (20),
In the digital broadcast receiver (10) adapted to switch to the received interrupt audio service component, only the audio from the audio output means (20) is output for the interrupt audio service component in the same language as the set language. Output switching is allowed, and the setting
The term is the type of audio service component for interrupts.
A digital broadcast receiver characterized in that it can be set for each type. 2. The digital broadcast receiver according to claim 1, wherein one or more of the set languages are set in advance by user setting. 3. The apparatus according to claim 1, wherein the set language is set to the same language as the service component of the audio currently being output from the audio output means. A digital broadcast receiver as described. 4. An interrupt audio service component which permits switching of audio output from the audio output means (20) can be freely selected by a user setting as to whether or not to be limited to the same language as the set language. The digital broadcast receiver according to claim 1, wherein: