JPH08265190A - Fm multiplex broadcast receiver - Google Patents

Abstract

PURPOSE: To provide the title receiver wherein specific programs are displayed omitting operations for selecting menus through such programs are usually selected by the use of a menu screen, and a user can change setting of such specific programs as depend on the user and reception status. CONSTITUTION: The receiver is provided with a RAM 15 storing program numbers in advance and with a control circuit 13 allowing a display device 16 to display received display information without selection processing on a menu when a program number of the display information received earlier than the menu information is coincident with a program number stored in the RAM 15. Furthermore, the control circuit 13 allows the display device 16 to display the received display information without selection processing on the menu even after the reception of the menu information till a menu key K2 is operated. Moreover, the control circuit 13 allows the RAM 15 to write a program number based on the operation of selection keys K3 to K8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcasting receiver.

[0002]

2. Description of the Related Art FM multiplex broadcasting is a broadcasting system for providing a new service by multiplexing digital signals such as characters, graphic information, data, etc. in a gap between radio waves of FM audio broadcasting (see Japanese Patent Laid-Open No. 3-6926). ). This system has been put to practical use in RDS in Europe and RBDS in the United States. Even in Japan, some broadcasting stations are preparing for the start of services in April 1995. This includes news, weather forecasts,
There are display information such as complementary programs, music programs, traffic information and emergency broadcasts, and they are classified according to their contents. This selection is made based on the menu sent from the broadcasting station.

[0003]

The types of display information described above can be classified into two types depending on whether or not they are related to the sound being broadcast. In the case of the above six types, the display information related to the audio being broadcast is a complementary program. Hereinafter, the display information related to the audio being broadcast is called a complementary program. Since the complementary program is related to the sound, it is very frequently displayed. Even if the complementary program is received, in order to display the complementary program, it is necessary to wait for the reception of the menu information and the selection process, which delays the display of the complementary program. Further, a selection operation on the menu screen is required, and the operation is particularly troublesome in a vehicle-mounted receiving device. In addition, since there are many types of text broadcasting, text information that is frequently used is not always a complementary program, and depending on the user,
Or it depends on the situation.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a first feature thereof is to have a storage means for storing a specific type number in advance, and the control circuit has a function of storing information before menu information. When the type number of the received display information matches the type number stored in the storage means, the received display information is displayed without performing the selection process by the menu.

A second feature is that the control circuit is provided with a menu key, and until the menu key is operated, the control circuit displays the received display without performing the selection process by the menu even after receiving the menu information. The information is displayed.

A third feature is that a selection key is provided, and the control circuit writes a classification number in the storage device based on the operation of the selection key.

[0007]

When the specific display information is received before the menu information, the selection processing by the menu is omitted and displayed.
Even if the menu information is received first, the menu is not displayed unless the menu key is pressed, and the specific display information received later is displayed. Further, the user can specify or change this specific display information.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a main part of the embodiment.
(1) is an FM receiving circuit, which comprises an FM front end (2), an FM-IF detector (3) and an FM stereo demodulation circuit (4). The FM front end (2) amplifies the signal received from the antenna (5) into a high frequency signal, mixes the high frequency signal and the oscillation signal from the PLL circuit (6) and outputs an intermediate frequency signal. The FM-IF detector (3) performs FM detection on the intermediate frequency signal output from the FM front end (2). The FM stereo demodulation circuit (4) reproduces the L channel and R channel signals using the stereo composite signal input from the FM-IF detector (3), and outputs each channel signal. The signal output from the FM stereo demodulation circuit (4) is amplified by the amplifier circuit (7) and output as voice from the speaker (8).

Reference numeral (9) is a multiplex signal detection circuit, which comprises a multiplex filter (10) and a data demodulation circuit (11). The multiplexing filter (10) removes a voice signal and a noise component from the output signal of the FM front end (2),
LMSK (Level controll) multiplexed at 76 kHz
ed Minimum Shift Keying) signal is extracted. LMSK
Is a modulation method for controlling the size of a multiplexed signal according to the size of a stereo audio signal. The data demodulation circuit (11) demodulates the LMSK signal into a displayable data signal, removes the level fluctuation of the LMSK signal, detects the sync signal, removes the PN code, and performs error correction.

Reference numeral (12) is an operation unit having a plurality of keys as shown in FIG. Among them, FM multiple key (K1)
Is a key for switching operation from another mode to FM multiplex mode, FM multiplex menu key (K2) is a key for performing menu display operation, and selection keys 1 to 6 (K3
..- K8) are keys for operating the program designation of the character information displayed on the menu. Reference numeral (13) is a control circuit, which controls each part based on the operation unit (12) and the multiple signal detection circuit (9). Reference numeral (14) denotes a ROM, which stores programs for operating the control circuit (13), data of initial values, and the like (program information of menu information and program information, program numbers of specific programs, and the like). Reference numeral (15) is a RAM, which stores data necessary for the operation of the control circuit (13). (16)
Is a display device, and FM multiplex broadcasting menu information (see FIG. 2).
Of the display device (16)) and the characters of the display information or the frequency or time of the AM / FM broadcasting station.
The number of characters displayed is 15.5 characters x 2 in accordance with FM multiplex broadcasting.
More than a line.

Next, the structure of the FM multiplex broadcast signal received in this embodiment will be described. This FM multiplex broadcast signal complies with the Ministry of Posts and Telecommunications Notification No. 461 (August 25, 1994).

The signal of the FM multiplex broadcast is a packet format, and one frame is 288 bits × 272 rows (block).
As shown in FIG. 3, it is composed of 190 blocks (packets) for transmitting data and 82 parity blocks (parity packet) for transmitting parity in the column direction. The parity packet consists of a block identification code (BIC) and a check code (parity) (FIG. 4).

A program number indicating the type of text information is included in the packet. The position of the program number in the packet will be described with reference to FIG. (A) shows the structure of the packet, and the program number is included in the data packet therein. (B) shows the structure of the data packet, and the program number is included in the data block therein. If the data block is a character / figure 1
It is 44 bits and 160 bits for additional information. (C) shows the structure of a data group for characters / graphics, and is composed of one or a plurality of data blocks. The number of data blocks can be determined by the end code of each data group. The program number is included in the data group data in the data block. The description of the data group of the additional information is omitted. (D) shows the structure of program data, and is composed of one or a plurality of data group data in one data group. The head is program management data, and the following is composed of one or a plurality of page data. The program number is included in both program management data and page data.
(E) shows the structure of the program management data and the page data, and the program number is included in the program data header and the page data header, respectively. (F) shows the beginning of the structure of the program data header and page data header, and the program number is in this. The program number is 8 bits, and the contents of 256 types of character information can be distinguished. The program number 0 indicates the menu information, and the program number 254 indicates the supplement number.

The operation of the first embodiment having the above configuration will be described with reference to the drawings. FIG. 6 is a flow chart showing the main operation of the control circuit (13). When the device is turned on, the control circuit (13) is activated based on the program in the ROM (14). At this time, data such as the program information of the menu information and each program information, and the program number of the specific program are transferred from the ROM (14) to the RAM (15). When the FM multiplex key (K1) is pressed to switch from another mode such as TAPE to the FM multiplex mode (Y in S1), the control circuit (13) causes the specific program written in the RAM (15). The number "254" is read out, and this is compared with the data of the program number included in the signal from the multiplex signal detection circuit (9) to check whether a complementary program has been received (S2). When the complementary program is not detected (N in S2), it is similarly checked whether or not the menu information is received (S3). If the menu information has not been received, the process returns to step S2. If the menu information has been received, the menu is displayed and the designated program is displayed (S4). When the complementary program is received in step S2, the complementary program is immediately displayed (S5). In this way, the complementary program information received before the menu information can be displayed without performing the selection process by the menu.

A second embodiment will be described with reference to the drawings. The configuration is the same as the block diagram of the first embodiment, but the operation of the control circuit (13) is different. FIG. 7 is a flowchart showing the operation of the control circuit (13) of the second embodiment. Steps corresponding to those in FIG. 6 are assigned the same numbers and their explanations are omitted. If the complementary program is not received in step S2 (N in S2), unless the menu key (K2) is pressed (N in S6), regardless of whether menu information is received,
Wait for the reception of the complementary program. If the menu key (K2) is pressed (Y in S6) and the menu information is received (Y in S7), the selection processing by the menu is performed, and if the menu information is not received (N in S7), the reception is performed. Wait until you do.
Although not shown, the program information received after step S1 until the menu key (K2) is pressed is RA.
It is stored in M (15) and can be read out from the RAM (15) and displayed after the menu key (K2) is pressed. In the second embodiment, even if the menu information is received, as long as the menu key (K2) is not pressed, the complementary program information can be displayed without performing the selection process by the menu. Therefore, as compared with the first embodiment, the user can select to give stronger priority to the complementary program.

A third embodiment will be described with reference to the drawings. The configuration is the same as the block diagram of the first embodiment, but the operation of the control circuit (13) is different. FIG. 8 is a flow chart showing the operation of the control circuit (13) of the second embodiment, and the steps corresponding to FIG. 6 are assigned the same numbers. When the FM multiplex key (K1) is pressed (Y of S1), the control circuit (13)
Reads the program number of the specific program from the RAM (15) (S8). When the program information matching this number is received before the menu information (Y in S2), the program is displayed (S5). When the menu information is received before the specific program information (Y of S3), the menu is displayed (S9).
The selection keys 1 to 6 (K3 to K8) for selecting a program are pressed (Y of S10), but if the time of pressing this is 3 seconds or more (Y of S11), the program number of the selected program is It is written in the RAM (15) as a new specific program (S12). In this way, it is possible for the user to change the setting of a specific program whose setting is different depending on the user and the situation.

It should be noted that the last selected program can be made a specific program without the condition of 3 seconds or more, the selected number of times can be stored, and the specific program can be automatically set based on this number of times. You can also do it. Further, a plurality of programs may be set specifically.

Generally, the type and division of the program form include a complementary program that complements the content of the main program, a subtitle program that transmits subtitle data corresponding to the content of the main program in synchronization with the progress of the program, and the main program. In addition to independent programs that are unrelated to the content, repetitive types that repeatedly transmit programs in short cycles, or other non-repetitive types, non-collective types that sequentially present and process program data transmitted by the receiving side, or , There is a batch type in which all data of a program is received at the receiving side and the presentation processing is performed.

Among these, complementary programs, subtitle programs, non-repetitive types, and non-collective types are closely related to audio. Although the complementary program is preferentially displayed in the above embodiment, a subtitle program, a non-repeating program, or a non-collective program may be preferentially displayed. As a method of recognizing these subtitle programs, non-repetitive type and non-collective type, in the case of the present embodiment, the prefix of FIG. 5B has a 4-bit service identification, and the 4-bit is 1 in hexadecimal. When it indicates sequential (non-collective). Television F
In the case of M multiplex broadcasting, the program management data header (PRC
I) and page data header (PACI) data block DB 14, as shown in FIG.
Non-repeating and non-collective types can be recognized.

[0020]

[Effect of the Invention] Normally, a program is selected by selection on the menu screen, but this menu selection operation is omitted and a specific program is displayed. As a result, the complementary program can be displayed quickly. Further, particularly when used in a vehicle, a receiver having good operability can be supplied. Furthermore, it is possible for the user to change the setting of a specific program that the user wants to set differently depending on the user and the situation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a display device and an operation unit according to an embodiment.

FIG. 3 is a diagram showing the structure of one frame of FM multiplex broadcasting.

FIG. 4 is a diagram showing a structure of a parity packet of FM multiplex broadcasting.

FIG. 5 is a diagram showing a program number in a packet of FM multiplex broadcasting.

FIG. 6 is a flowchart showing the operation of the first exemplary embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the second embodiment.

FIG. 8 is a flowchart showing the operation of the third embodiment.

FIG. 9 is a diagram showing a partial data structure of an FM multiplex signal in a television.

[Explanation of symbols]

 1 FW reception circuit 8 speaker 9 multiplex signal detection circuit 12 operation unit 13 control circuit 16 display device K2 menu key

Claims (3)

[Claims] 1. An FM receiving circuit for receiving an FM multiplex signal having a voice signal, a plurality of types of display information each having a type number, and menu information for selecting the display information, and the FM receiving circuit comprising: A multiple signal detection circuit that detects the display information and the menu information, a display unit that displays the display information or the menu information, an operation unit that selects the display information to be displayed, and the received menu information are displayed. An FM multiplex broadcast receiving apparatus comprising: a control unit that displays display information of a type selected by the operation unit based on the type number; a storage unit that stores a specific type number in advance; When the type number of the display information received prior to the menu information matches the type number stored in the storage means, the selection process by the menu is performed. It not, FM multiplex broadcast receiving apparatus characterized by displaying the display information received. 2. A menu key is provided, and until the menu key is operated, the control circuit displays the received display information without performing selection processing by the menu even after receiving the menu information. The FM multiplex broadcast receiving apparatus according to claim 1, characterized in that. 3. The FM multiplex broadcast receiving apparatus according to claim 1, further comprising a selection key, wherein the control circuit writes a classification number in the storage device based on an operation of the selection key.