JP2000295125A - Receiver for digital audio broadcast - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain ease of operations for program selection in a DAB(digital audio broadcast in compliance with the Eureka 147 standards) receiver. SOLUTION: In the case that a usual display mode is set through the operation of a display mode key KM, a display element 32 displays information relating to a program under reception. In the case that a list display mode is set through the operation of the display mode key KM, the display element 32 displays items in each layer in form of a list and when operation keys KL, KR are operated, the displayed layer is changed. When operation keys KU, KD are operated, an item of the displayed layer is selected. When an enter key KE is operated for the result of selection, the program corresponding to the selected item is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio broadcasting receiver.

[0002]

2. Description of the Related Art DAB (Eur
digital audio broadcasting according to the Eka 147 standard). Transmission bandwidth: 1.5 MHz Modulation method: D-QPSK Data compression method of audio signal: Simultaneous broadcasting of up to 64 sets of digital audio signals and digital data by employing MPEG audio layer II It is.

[0003] For this reason, in the DAB, the broadcast of a program has a hierarchical structure, for example, as shown in FIG. That is, as described above, DAB is used for 1.
Although using a transmission bandwidth of 5 MHz, this transmission channel is called an "ensemble" and the ensemble is selected by tuning to the center frequency of the ensemble.

[0004] The ensemble is divided into groups called "services". In the case of ensemble A in FIG. 13, the service is divided into four services. The service is further divided into several "service components", each of which is a digital audio signal or digital data constituting one program.

[0005] In this case, the service is one of the general broadcasting stations.
For example, the first service component of service 1 of ensemble A broadcasts soccer (program 1A) in the first venue, and the second service component broadcasts soccer (program 1) in the second venue. 1B), and so on. Alternatively, the first service component broadcasts news in English,
The second service component is used to broadcast news in French, and so on.

Further, the ensemble, the service and the service component are given identification codes called “ensemble ID”, “service ID” and “service component ID” for identifying them. Ensembles and services also include
An "ensemble label" and a "service label" to indicate their names are also given. Note that service components are not generally labeled,
They are called "primary service component", "secondary service component 1", "secondary service component 2", and so on.

As described above, in the DAB, the ensemble, the service, and the service component have a hierarchical structure. Therefore, when listening to the DAB program, an ensemble (frequency) is selected, and a plurality of services in the ensemble are selected. Is selected, and a target service component (program) is selected from the selected services.

[0008]

However, some FMs
Preset functions are provided for receivers and AM receivers,
When this is executed, the frequencies of the receivable broadcast stations are registered in the memory for channel selection, and thereafter, the registered broadcast stations can be selected by simple key operations.

Therefore, it is conceivable to prepare such a preset function also in the DAB receiver. However, in FM broadcasting and AM broadcasting, broadcast stations and programs correspond one-to-one, whereas in DAB, as described above, ensembles, services and service components have a hierarchical structure, and There is no one-to-one correspondence between stations and programs.

Therefore, as in the case of the FM receiver or the AM receiver, even if the frequency and the ensemble name of the DAB station are registered, the target program cannot be easily selected. In addition, since all the DAB stations broadcast programs in a hierarchical structure as shown in FIG. 13, the selection of programs becomes even more inconvenient.

The present invention is intended to solve such a problem.

[0012]

Therefore, according to the present invention, in a digital audio broadcasting receiver in which a plurality of programs are classified in a hierarchical manner and broadcast in one transmission band, a first operation key; A second operation key, a display mode key, an enter key, and a display element. When the display mode is set to the second display mode by operating the display mode key, the items in the hierarchy are displayed in a list form on the display element, and the first operation key is pressed. When operating, the displayed hierarchy is changed, and when operating the second operation key, an item in the displayed hierarchy is selected, and the enter key is operated in response to the selection result. When in is for a receiver of digital audio broadcasting to selection of a program is performed corresponding to the selected item. Therefore, a hierarchy is selected by the first operation key, an item in each hierarchy is selected by the second operation key, and a program is selected according to the selection result.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a broadcast wave signal of DAB is received by an antenna 11, and this received signal is supplied to a tuner circuit 12. This tuner circuit 12
It is configured in a superheterodyne system with a PLL,
By changing the frequency division ratio N of the variable frequency divider circuit of the PLL, the reception frequency can be changed. Then, a DAB baseband signal is demodulated and extracted from the tuner circuit 12, and this signal is supplied to an A / D converter circuit 13 and A / D converted into a digital signal.

The digital signal is supplied to a quadrature demodulation circuit 14 to demodulate data of an in-phase component (real axis component) and a quadrature component (imaginary axis component).
The T circuit 15 performs a complex Fourier transform to output a frequency component for each symbol, and the output is supplied to a Viterbi decoder circuit 16 to perform deinterleaving and error correction, and to perform digital audio of a target service component (program). The data is selected.

Subsequently, the selected data is supplied to an audio decoder circuit 17, where decoding processing such as MPEG data expansion is performed.
Digital audio data of a target service component is extracted. Then, the extracted digital audio data is supplied to a D / A converter circuit 18 and D / A converted into analog audio signals L and R. The signals L and R are supplied to speakers 21L and 21R through amplifiers 19L and 19R. Is done.

A microcomputer 31 is provided for controlling the system.
Ensemble (reception frequency) from 1 to tuner circuit 12
Is supplied as frequency data for selecting a frequency division ratio N of the variable frequency dividing circuit in the PLL.

Further, data such as a service ID and a service component ID are taken out from the Viterbi decoder circuit 16 as data necessary for identifying or specifying the service and the service component, and these data are supplied to the microcomputer 31. Further, the microcomputer 31 supplies the selection signals SSV and SCH to the Viterbi decoder circuit 16 and outputs the signals SSV
, A digital audio data of a target service component is selected from the selected services by the signal SSC.

The microcomputer 31 is provided with, for example, routines 100 to 300 as shown in FIGS. 10 to 12 as a part of a program executed by the CPU of the microcomputer 31. Although details of these routines 100 to 300 will be described later,
10 to 12, only portions related to the present invention are extracted and shown.

Further, the microcomputer 31 includes:
A memory 311 is provided as a memory for storing and storing program selection data. This memory 311
Is, for example, a flash memory, or a C-MOS (not shown) backed up by a battery.
It is a memory, that is, a non-volatile memory, and can hold written data even when the power is turned off.

The program selection data stored in the memory 311 is data necessary for selecting a program for each program, and includes ensemble ID, service I
D, service component ID, ensemble label, service label, frequency division ratio N, and the like. These program selection data are stored in the memory 311 when a key operation for presetting is performed in advance, or when a program is selected and determined by a manual operation.

The microcomputer 31 is connected to, for example, an LCD 32 as a display element. This LC
D32 is designed so that characters and the like can be displayed in a required size by a combination of dots arranged in a matrix.

Further, the microcomputer 31 includes:
For example, various operation keys KU, KD, KL, KR, KM,
KE and K1 to Km are connected.

In this case, the keys KU, KD, KL, KR
Is a selection key for selecting an ensemble, a service, and a service component, and is arranged, for example, in a cross shape on the operation panel of the receiver for easy understanding. That is, the up key KU and the down key KD are arranged vertically, and the left key KL and the right key KR are arranged right and left. The key KU
, KD, KL and KR can be integrated in a cross shape.

A key KM is a display mode key for selecting a display mode for displaying a broadcast station name, a service name, and a program name, and the key KE is a selection key KU.
This is a decision key for validating the item selected by .about.KR. Further, the keys K1 to Km are keys for performing general operations of the receiver.

In such a configuration, each time the display mode key KM is pressed, the display mode on the LCD 32 changes from "normal display mode" to "normal display mode" as shown in FIG.
It is repeatedly switched in the order of “preset list display mode” → “reception list display mode” → “normal display mode” →. In each display mode, the following display is performed.

"Normal Display Mode" In the normal display mode, data obtained from a broadcast being received is
A display such as that shown in FIG. 3 is displayed on the CD 32, for example. That is, the LCD 32 displays the currently received program
The ensemble name, service name, program name, and the like are displayed.

At this time, the ensemble name and the service name can be displayed using the ensemble label and the service label transmitted together with the program. However, since the label directly indicating the program name is not transmitted, the program name is generally not transmitted. The name is displayed as a character string converted from the service component ID, for example, as “primary”.

"Preset list display mode" This preset list display mode is a mode for selecting and determining an ensemble, a service and a service component according to the program selection data stored in the memory 311. For example, FIG. As shown, it is further divided into an “ensemble list display mode”, a “service list display mode”, and a “component list display mode”.

The ensemble list display mode is a mode for selecting and determining an ensemble. The service list display mode is a mode for selecting and determining a service in the ensemble selected and determined in the ensemble list display mode. Further, the component list display mode is a mode for selecting and determining a service component in a service selected and determined in the service list display mode.

Then, as shown in FIG. 4, the right key KR
Each time the button is pressed, the display mode on the LCD 32 is repeatedly switched in the following manner: ensemble list display mode → service list display mode → component list display mode → ensemble list display mode →.

When the left direction key KL is pressed, the right key K
Each time the R is pressed, the LCD 32
Are repeatedly switched as shown in ensemble list display mode → component list display mode → service list display mode → ensemble list display mode →.

In these display modes,
According to the program selection data stored in the memory 311, display, selection and determination of an ensemble, service or service component can be performed as follows. In the following description, labels and IDs of ensembles, services, and service components having the configuration shown in FIG.
Is stored in the memory 311 as a part of the program selection data.

Further, in the following description, as shown in FIG. 8, a list of ensemble names is called an “ensemble list”, a list of service names in an arbitrary ensemble is called a “service list”, A list of character strings indicating service components in a service is called a “component list”.

[Ensemble List Display Mode] In this ensemble list display mode, an ensemble list is displayed on the LCD 32 by ensemble labels stored in the memory 311 so that a target ensemble can be selected from the list. Become.

That is, when the ensemble labels of the ensemble shown in FIG. 8 are stored, as shown in FIG. 5A, the ensemble names "ensemble A", "ensemble B", and "ensemble C" are displayed on the LCD 32. ,... Are displayed in a list format with one line per ensemble.

At this time, if the ensemble being received is, for example, ensemble B, an asterisk (*) is displayed in front of the character string indicating the ensemble B being received, as shown in FIG. 5A. The character string is displayed in a reverse display indicating a cursor (in FIG. 5, the cursor in the reverse display is indicated by a frame line for convenience of drawing. The same applies hereinafter).

When the down key KD is pressed in such a display state, as shown in FIG. 5B, the cursor moves to the position of the ensemble name in the next lower row.
When the downward key KD is pressed, the cursor is further moved to the position of the ensemble name one row below as shown in FIG. 5C. Thus, every time the down key KD is pressed, the cursor moves downward by one ensemble.

When there are many ensembles and the ensemble list does not fit on one screen of the LCD 32,
The ensemble name is scrolled. When the down arrow key KD is pressed while the cursor is displayed at the position of the ensemble name on the last line, the key operation is ignored.

On the other hand, for example, in the display state of FIG. 5C, when the up key KU is pressed, the cursor moves to the position of the ensemble name in the next upper row, as shown in FIG. 5B. When KU is pressed, the cursor moves to the position of the ensemble name in the next higher row as shown in FIG. 5A. Thus, every time the up key KU is pressed, the cursor moves upward by one ensemble.
When the cursor is displayed at the position of the ensemble name on the first line and the up direction key KU is pressed,
The key operation is ignored.

Thus, by pressing the down key KD or the up key KU, the cursor can be moved to an arbitrary ensemble name in the ensemble list. In addition, the ensemble name of the ensemble currently being received is indicated by an * mark.

When the cursor is positioned at the position of the ensemble name of the target ensemble, if the right key KR is pressed, the display mode is the ensemble list display mode as described with reference to FIG. Transit to service list display mode. At this time,
The frequency dividing ratio N for receiving the ensemble at the cursor position is read from the memory 311 and the microcomputer 3
1 is temporarily stored in the RAM.

Therefore, in the ensemble list display mode, any ensemble among the ensembles stored in the memory 311 is displayed by using the up / down keys KU, K
It can be selected and stored once by D.

[Service List Display Mode] In this service list display mode, the service label of the service in the ensemble selected in the ensemble list display mode is read out of the service labels stored in the memory 311 and is displayed on the LCD 32. According to the service label read out, a service list is displayed and a target service can be selected from the service list.

That is, for example, when the service label of the service shown in FIG. 8 is stored in the memory 311 and ensemble B is selected in the ensemble list display mode, as shown in FIG.
In D32, the character strings of "Service 1", "Service 2",..., "Service 5" in ensemble B are displayed in the form of a list with one line per service as the service name.

At this time, if the service being received is, for example, the service 2, as shown in FIG. 6A, an asterisk is displayed in front of the character string indicating the service 2 being received. , The character string is displayed in reverse video indicating the cursor.

When the down key KD is pressed in such a display state, as shown in FIG. 6B, the cursor is moved to the position of the service name in the next lower row, and further, the down key KD By pressing, as shown in FIG.
The cursor moves to the position of the service name in the line below. Thus, each time the down key KD is pressed, the cursor moves downward by one service.

When there are many services and the service list does not fit on one screen of the LCD 32, the service names are scrolled and displayed. When the down key KD is pressed while the cursor is displayed at the position of the service name on the last line, the key operation is ignored.

On the other hand, in the display state of FIG. 6C, for example, when the up key KU is pressed, the cursor moves to the position of the service name in the line immediately above as shown in FIG. 6B. When KU is pressed, as shown in FIG. 6A,
The cursor moves to the position of the service name one line above.
Thus, every time the up arrow key KU is pressed, the cursor moves by one.
Move upward by service. When the cursor is displayed at the position of the service name on the first line,
When the up key KU is pressed, the key operation is ignored.

Thus, by pressing the down key KD or the up key KU, the cursor can be moved to the position of an arbitrary service name in the service list. Also, the service name of the service currently being received includes
* Mark is displayed.

When the cursor is positioned at the position of the service name of the target service, the right direction key KR
When the user presses the button, the display mode changes to the component list display mode as described with reference to FIG. At this time, the service ID of the service at the cursor position is temporarily stored in the RAM of the microcomputer 31.

Therefore, in the service list display mode, any of the services whose data is stored in the memory 311 and which is selected by the ensemble list display mode, can be changed to the up and down keys KU and KD. Can be selected and stored once.

[Component List Display Mode] In this component list display mode, the memory 3
11, the service component ID of the service component in the service selected in the service list display mode among the component IDs stored in
Is read. Then, the read service component ID is converted into a service component name and displayed on the LCD 32 as a component list, from which a target service component can be selected.

That is, for example, when the service component ID of the service component shown in FIG. 8 is stored in the memory 311 and the service 2 of the ensemble B is selected in the service list display mode, as shown in FIG. 7A. Then, on the LCD 32, character strings of "primary service component", "secondary service component 1", and "secondary service component 2" are displayed as a service component name in a list format with one line per service component. .

At this time, assuming that the service component being received is, for example, the primary service component, as shown in FIG. 7A, a character string indicating the primary service component being received has an * before it.
A mark is displayed, and the character string is displayed in reverse video indicating the cursor.

When the down key KD is pressed in such a display state, as shown in FIG. 7B, the cursor moves to the position of the service component name in the next lower row, and the down key is further pressed. When KD is pressed, as shown in FIG. 7C, the cursor is further moved to the position of the service component name one row below. Thus, the down arrow key K
Each time you press D, the cursor moves down by one service component.

When there are many service components and the component list does not fit on one screen of the LCD 32, the service component names are scrolled and displayed. When the down key KD is pressed while the cursor is displayed at the position of the service component name on the last line, the key operation is ignored.

On the other hand, for example, when the upward key KU is pressed in the display state of FIG. 7C, as shown in FIG. 7B, the cursor is moved to the position of the service component name in the next higher row, and When the direction key KU is pressed, as shown in FIG. 7A, the cursor is further moved to the position of the service component name one line higher. Thus, every time the up key KU is pressed, the cursor moves upward by one service component. When the cursor is displayed at the position of the service component name on the first line and the up key KU is pressed, the key operation is ignored.

Thus, by pressing the down key KD or the up key KU, the cursor can be moved to an arbitrary service component name among the service component names displayed in the list format. In addition, an asterisk is displayed on the service component name of the service component currently being received.

When the cursor is positioned at the position of the service component name of the target service component, when the enter key KE is pressed, the service component ID for selecting the service component at the cursor position is displayed on the microcomputer 31. Once stored in RAM.

Therefore, in the component list display mode, an arbitrary service component among the service components stored in the memory 311 and selected for the service in the service list display mode is selected by the up / down key KU,
Once selected by KD, it can be stored once.

Since the determination key KE is depressed in the component list display mode, the frequency division ratio N once stored in the RAM of the microcomputer 31 is read out in the ensemble list display mode. The output dividing ratio N is set in the tuner circuit 12, and the ensemble selected in the ensemble list display mode is received.

Subsequently, in the service list display mode, the service ID once stored in the RAM of the microcomputer 31 is read, and a selection signal SSV corresponding to the read service ID is supplied to the Viterbi decoder circuit 16. And the service with that service ID is selected. Further, in the component list display mode, the service component ID once stored in the RAM of the microcomputer 31 is read, and a selection signal SSC corresponding to the read service component is supplied to the Viterbi decoder circuit 16, and The service component with the service component ID is selected.

Therefore, a program can be selected according to the program selection data stored in the memory 311 and the user can listen to the program thereafter. The display mode returns to the normal display mode.

Thus, in the preset list display mode, a program can be selected within the range of the program selection data stored in the memory 311. And
In this case, the hierarchy of the ensemble, the service and the service component can be selected by the left and right keys KL and KR. In any selected hierarchy, the desired item is selected by the up and down keys KU and KD. be able to.

[Receive List Display Mode] In this receive list display mode, the same processing as in the above-described preset list display mode is performed using data included in the signal being received.

That is, in DAB, for example, FIG.
As shown in (1), when a certain ensemble A is being received, this ensemble A may broadcast various types of information on other ensembles B and C. Therefore, in this reception list display mode, when information is obtained not only for the ensemble currently being received but also for other ensembles, the names of other ensembles can be displayed and selected by using the information. This is the case.

Therefore, the reception list display mode also
For example, as shown in FIG. 4, the image is divided into an “ensemble list display mode”, a “service list display mode”, and a “component list display mode”.

By using the program selection data obtained from the currently received ensemble in place of the program selection data in the memory 311 used in the preset list display mode, similar to the preset list display mode, "Ensemble list display mode",
“Service list display mode” and “component list display mode” are realized.

Therefore, even in the reception list display mode, the program can be selected within the range of the program selection data obtained by the currently received ensemble. In the reception list display mode, the left and right keys K
Ensemble, service and service component layers can be selected by L and KR. In any of the selected layers, up and down keys KU and
The target item can be selected by KD.

[Routines 100 to 300] Here, the routines 100 to 300 will be described.

The routine 100 is for realizing the switching of the display mode shown in FIG.
Executed when M is pressed. And routine 10
0, the current display mode is the normal display mode,
It is determined which of the preset list display mode and the reception list display mode, and the display mode is switched to the next mode according to the determination result.

The routine 200 is for realizing the switching of the display mode shown in FIG. 4 between the preset list display mode and the reception list display mode, and the left key KL or the right key LR is pressed. When executed. In this routine 200, it is determined whether the current display mode is the ensemble list display mode, the service list display mode, or the component list display mode, and the display of the upper or lower hierarchy is performed according to the determination result. Transition to mode.

Further, the routine 300 is for realizing the movement of the cursor in FIGS. 5 to 7 in the ensemble list display mode, the service list display mode, and the component list display mode. When key LD is pressed,
Be executed. Then, in this routine 300,
If the pressed key is the up key KU, move the cursor to 1
Move to the line, and if it is the down direction key LD, move down one line.

As described above, in the DAB receiver of FIG. 1, a program (service component) can be selected. In this case, especially in the above-described DAB receiver, the preset list display mode is set. Even in the reception list display mode, when the left and right keys KL and KR are pressed, the respective layers of the ensemble, the service and the service component can be freely moved upward or downward. Then, in the moved hierarchy, regardless of the hierarchy, the up / down keys KU, K
The target item can be selected by D. That is, the key operation is unified regardless of the display mode or the hierarchy. Therefore, when a target program is selected, it can be easily selected.

In the ensemble list display mode, the service list display mode, and the component list display mode, when the cursor is on the last line and the down key KD is pressed, the cursor is moved to the first line. Thereafter, every time the down key KD is pressed, the cursor is moved downward by one line, and when the cursor is at the first line, when the up key KU is pressed, the cursor is moved to the last line. Thereafter, the up arrow key K
Each time you press U, you can move the cursor up one line at a time.

In the above description, the cursor is displayed on the item to be selected in the ensemble list display mode, the service list display mode, and the component list display mode, but it may be a pointer such as an arrow. Alternatively, the display color of the target item can be changed. That is, the display form of the target item may be different from other items. Also, the item currently being received can be displayed in the same manner.

[0077]

According to the present invention, when a plurality of programs are hierarchized, when the first key is pressed, each hierarchy can be freely moved upward or downward. In the moved layer, the target item can be selected by the second key regardless of the layer, and the key operation is unified. Therefore,
When selecting a target program, it can be easily selected.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating one embodiment of the present invention.

FIG. 2 is a transition diagram for explaining an operation example in the present invention.

FIG. 3 is a diagram showing a display example according to the present invention.

FIG. 4 is a transition diagram for explaining an operation example according to the present invention.

FIG. 5 is a diagram showing a display example according to the present invention.

FIG. 6 is a diagram showing a display example in the present invention.

FIG. 7 is a diagram showing a display example according to the present invention.

FIG. 8 is a diagram for explaining the present invention.

FIG. 9 is a diagram for explaining the present invention.

FIG. 10 is a flowchart for explaining the present invention.

FIG. 11 is a flowchart for explaining the present invention.

FIG. 12 is a flowchart for explaining the present invention.

FIG. 13 is a diagram for explaining the present invention.

[Explanation of symbols]

11 antenna, 12 tuner circuit, 13 A / D converter circuit, 14 quadrature demodulation circuit, 15 FFT circuit, 16 Viterbi decoder circuit, 17 audio decoder circuit, 18 D / A converter circuit, 21L and 21R: speaker, 31: microcomputer, 32
... LCD, 100-300 ... Routine, 311 ... Non-volatile memory, K1-Km ... Operation keys, KD ... Down arrow key,
KE: Enter key, KL: Left direction key, KM: Display mode key, KR: Right direction key, KU: Up direction key

Claims (4)

[Claims] 1. A digital audio broadcast receiver in which a plurality of programs are classified in a hierarchical manner and broadcast in one transmission band, a first operation key, a second operation key, a display mode key, When the first display mode is set by operating the display mode key, information on a program being received is displayed on the display element, and an operation of the display mode key is performed. Accordingly, when the second display mode is set, the items in the hierarchy are displayed on the display element in a list format, and when the first operation key is operated, the displayed hierarchy is changed. When operating the second operation key, an item in the displayed hierarchy is selected. When operating the enter key in response to the selection result, a number corresponding to the selected item is selected. A digital audio broadcast receiver in which a pair selection is performed. 2. The digital audio broadcast receiver according to claim 1, wherein the highest floor of said hierarchy is an ensemble and the lowest floor is a service component. 3. The digital audio broadcast receiver according to claim 1, wherein the first operation keys are arranged such that two keys for moving up and down the hierarchy are arranged in a horizontal direction. The second operation key is configured by arranging two keys for selecting the item in a vertical direction, and the item is displayed in a list form on the display element line by line. Digital audio broadcasting receiver. 4. The digital audio broadcasting receiver according to claim 1, further comprising a memory for storing data for selecting said hierarchy and said program, and storing in said memory. According to the above data,
A digital audio broadcast receiver configured to display the hierarchy and the items on the display element.