JP2694770B2 - Digital data multiplexing system receiving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a digital data multiplexing system such as RDS.
The present invention relates to a receiving method in a (radio data system), and more particularly to a receiving method capable of easily selecting a multiple broadcasting station broadcasting a desired program content (genre), for example, an RDS station.

<Prior Art> On a car radio, traffic information can be easily obtained because the operator is a driver and a re-selection station is required every time the car moves and leaves the service area of the receiving station. It is required to be able to perform versatile tuning functions. And such a request is especially strong in Europe where the radio reception service is mainly the FM broadcast having a relatively small service area and the broadcast reception ratio of car radio is high. Therefore, a broadcasting system called RDS (Radio Data System) has been proposed and put into practical use by the European Broadcasting Union.

This RDS is a broadcasting system that multiplexes and transmits various messages (digital data) on FM radio signals. The messages are (i) program identification code (PI) (ii) broadcasting station of the currently received FM broadcasting. Name (PS) (iii) Broadcasting station frequency list (AF) during the same program broadcasting (iv) Program content identification code (PTY) (v) Transmission status identification code (DI) (vi) Musicalization conversation identification code ( M / S) and (iv) Traffic information broadcasting station identification signal (TP) (v) Traffic information identification signal (TA), etc., and 104 bits (4 blocks) of digital data can be sent to FM broadcasting at one time. Can be multiplexed. The program content identification code
PTY is expressed by 5 bits, and the relationship between the code and the program content (genre) is as follows.

00000 Program type No display 00001 News 00010 Current affairs 00011 Magazine 00100 Sports 00101 Education 00110 Children's programs 00111 Youth programs 01000 Religions 01001 Drama, literature, novels 01010 Pop & folk music 01011 Light music 01100 Classic 01101 Jazz 01110 Folk music 01111 Variety In addition, since messages related to the received FM broadcast are multiplexed in the RDS, it is possible to perform exceptional tuning operation that has never been done by using the messages. For example, if the electric field strength of the broadcasting station being received falls below a certain level due to the movement of a car, use an AF code to send to another broadcasting station that is broadcasting the same program with a good received electric field strength. It can be switched automatically.

By the way, there are cases where it is desired to receive a broadcast of a predetermined program (genre). In such a case, conventionally, the broadcasting from each broadcasting station is sequentially received by a manual operation to receive the broadcasting of a desired genre. For example, in the case of a radio receiver having a preset function, the preset key is operated in sequence to receive the broadcast from each broadcasting station and the broadcast of the desired genre.

<Problems to be Solved by the Invention> However, it suffices to know what genre the broadcasting station of the preset frequency is broadcasting, but if not, select a broadcasting station broadcasting the desired genre. Since it is necessary to operate the preset key many times to find out, there is a problem that it is troublesome and it takes time to select a channel. Similar problems may occur with other channel selection methods.

And, such a problem becomes particularly noticeable in a region where a large number of broadcasting stations exist, such as Europe.

From the above, it is an object of the present invention to provide an RDS receiving method capable of receiving a broadcast of a desired genre in a short time with a simple operation in an area where RDS is applied.

<Means for Solving the Problem> According to the present invention, the above-mentioned problem is a multiplex broadcasting station that stores the program content corresponding to each preset key and broadcasts the program content using the multiplex information. Means for storing in order of received electric field strength, means for discriminating from the stored contents the multiplex broadcasting station having the maximum received electric field strength among the multiple broadcasting stations broadcasting the program content corresponding to the operated preset key, A means for receiving a broadcast from the identified multiplex broadcasting station, and a preset key corresponding to the preset key when the preset key corresponding to the program of the broadcast is operated in the state of receiving the broadcast from the multiplex broadcasting station. It is reached by means for identifying from the stored contents a multiplex broadcasting station having a received electric field strength which is the next order of the multiplex broadcasting station currently being received, and means for receiving a broadcast from the identified multiplex broadcasting station. Is done.

<Operation> Corresponding to each preset key, the program content is stored, and multiplex stations broadcasting the program content are obtained by using the multiplex information and stored in the order of the received electric field strength. Among the multiple broadcast stations broadcasting the corresponding program content, the multiple broadcast station having the highest received electric field strength is identified from the stored content, the broadcast from the identified multiple broadcast station is received, and the multiple broadcast station receives the broadcast from the identified multiple broadcast station. When the preset key corresponding to the program of the broadcast is operated in the state of receiving the broadcast, the multiple broadcast station corresponding to the preset key is The next-order multiple broadcast station is identified from the stored contents, and the broadcast from the identified multiple broadcast station is received.

<Embodiment> FIG. 1 is a block diagram of a radio receiver for implementing the method of the present invention.

Reference numeral 10 is an antenna, 11 is a front end, 12 is an intermediate frequency amplification stage, 13 is a detection section, 14 is a stereo demodulation section, 15 is a low frequency amplifier, 16 is a speaker, 17 is an operation panel, and the display section DS.
P, genre enable key JEK, preset key PSK
Etc.

Enable keys by genre JEK is a radio receiver,
This key is for (i) genre-based registration mode or (ii) genre-based reception mode. In the genre-based registration mode, use the (i)
The genre and (ii) broadcasting stations broadcasting the genre can be stored in the order of the received electric field strength. In the genre-specific reception mode, by operating a predetermined preset key, the genre corresponding to the preset key can be stored. It is possible to receive a broadcast from a broadcasting station having the highest received electric field strength among broadcasting stations broadcasting.

18 is a PLL for setting the local oscillation frequency to a predetermined frequency
Circuit, 19 is a level meter that detects and outputs the received electric field level, 20 is R that demodulates the RDS modulated signal and reproduces the clock
A DS decoder / clock recovery unit, 21 is a group synchronization / error detection / correction unit that performs group synchronization and error correction of RDS data, and 22 is a microcomputer.

Each preset key PSK is stored in the memory 22a of the microcomputer 22.
Corresponding to the area AR1 for storing the preset frequency in correspondence with (keys NO.1 to NO.6) and each preset key (i)
An area AR2 for storing the genres and (ii) the broadcasting stations broadcasting the genres in the order of the received electric field strength is provided.

FIG. 2 (a) shows the correspondence between the preset keys (keys NO.1 to NO.6) and the preset frequencies. In the preset frequency registration processing, if the preset frequencies are stored as shown in the figure, for example, By operating the preset key of key No. 1, you can receive a (MHz) FM broadcast.

FIG. 2B shows the correspondence between the preset keys (keys NO.1 to NO.6), (i) genre, and (ii) broadcasting stations broadcasting the genre. This correspondence will be described later. It is automatically registered in the genre-specific registration mode. And in the reception mode by genre,
For example, when the preset key of key No. 1 is operated, the broadcast station (A) with the highest received electric field strength is automatically selected from the broadcast stations broadcasting the genre (lock) corresponding to the preset key.
_MHZ ) to receive broadcasts.

FIG. 3 is a flow chart of genre-based registration processing and genre-based reception processing, and the RDS receiving method of the present invention will be described below with reference to this flow chart.

When it is desired to perform genre registration or genre reception, the genre enable key JEK is pressed for a short time (for example, within 1.7 seconds) (step 101).

As a result, the microcomputer 22 sets the target memory area when the preset key PSK is pressed to the preset frequency memory AR.
The RDS memory area AR2 is changed from 1 (step 102).

Then, it is determined whether the genre registration or the genre reception is performed (103), and if the genre registration is performed, the genre enable key JEK is pressed for a short time (step 104). As a result, the microcomputer 22 is i + 1 → i (the initial value of i is 0)
As a result, the i-th genre name defined by the PTY code is displayed on the display DSP of the operation panel 17 (step 10).
Five).

It is determined whether or not the displayed genre name should be registered in the preset key (step 106), and if not registered, the processes in and after step 104 are performed to display the next genre name on the display section.

On the other hand, change the displayed genre name to the preset key PS
If the user wants to register in any of K, the genre enable key JEK is pressed for a long time (1.7 seconds or more) (step 107). As a result, the microcomputer 22 blinks the genre name displayed on the display DSP (step 10).
8).

Next, the microcomputer 22 checks whether or not the preset key for registering the blinked genre name has been pressed (step 109), and if it has not been pressed, checks whether a predetermined time has passed (step 110), and if not, The processing after step 109 is repeated.

However, if the preset key PSK of the predetermined key NO. Is pressed in step 109, the genre name is stored in the storage area of the RDS memory area A2 corresponding to the preset key of the NO. (Step 111). For example, if the genre name being blinked is "lock" and the preset key PSK of key NO.1 is pressed at this time, "genre" column of key NO.1 will be displayed as shown in FIG. 2 (b). "Lock" is stored.

Then, it is checked whether or not the genre registration to the preset key is completed (step 112), and if not completed, the processing from step 104 onward is repeated.

On the other hand, if the predetermined preset key is not pressed even after the lapse of a predetermined time after the genre name is blinked, the result of the processing in step 110 is “YES”, and the blinking is stopped, and the processing in step 106 and thereafter is performed. repeat.

 By the way, in Fig. 2 (b), "Lock" is assigned to the preset key of NO.1, "Classic" to the key of NO.2, "Jazz" to the key of NO.3, and NO.4. In this example, "folk music" is registered as the key of, "News" is registered as the key of NO.5, and "Sports" is registered as the key of NO.6.

When the genre registration to the preset key is completed by the above process, the genre enable key JEK is pressed a predetermined number of times for a short time until "END" is displayed on the display DSP (step 113).

Then, while the "END" is displayed, press the genre enable key JEK for a long time (step 1
14).

When the genre enable key JEK is pressed for a long time, the microcomputer 22 starts searching for receivable stations. That is, the microcomputer 22 controls the PLL circuit 18 to increase or decrease the reception frequency by a predetermined frequency, and refers to the output of the level meter 19 to search for a broadcasting station whose reception electric field strength is equal to or higher than a predetermined level (steps 115 to 115). 11
7).

If a broadcasting station having a received electric field strength of a predetermined level or higher is searched, the microcomputer 22 has multiplex-transmitted the RDS data to the FM broadcasting. In other words, it checks whether the broadcasting station is an RDS station (step 118). ). If it is not an RDS station, the processing from step 115 is performed to search for the next receivable broadcasting station, and the same processing is performed.

On the other hand, if it is the RDS station in step 118, the FM currently received by the PTY code included in the RDS data.
The genre of broadcasting is identified (step 119).

Then, it is checked whether or not the genre is registered in any preset key (step 120). If not registered, the processing from step 115 onward is repeated. If registered, the received electric field strength is based on the output of the level meter 19. Is detected (step 121).

Thereafter, the reception frequency is stored in the storage area of the RDS memory area A2 corresponding to the preset key of the identified genre, and the broadcast frequencies in the storage area are rearranged in the order of the electric field strength (step 122). Repeat the process. As a result, the FM frequencies of the broadcasting stations broadcasting the genre are arranged in the order of the received electric field strength (second
Fig. (B).

When the above processing is repeated and the search is completed for all frequencies in the range that can be received by the radio receiver, step 11
Since it is “YES” in 7, the microcomputer 22 selects from the broadcasting station with the highest received field strength (first rank) among the broadcasting stations broadcasting the genre (lock) according to the preset key of key NO. The broadcast is received and the registration process ends (step 123).

On the other hand, when receiving by genre, the process jumps from step 103 to step 201, and the user selects N according to the desired genre.
Press the preset key PSK of O. (step 201).

When the preset key is pressed, the microcomputer 22 sets 1 → j (step 202), and the station whose received electric field strength is the jth strongest among the broadcasting stations broadcasting the genre corresponding to the pressed preset key. The FM frequency is identified from the RDS memory area A2, and the PLL circuit 18 is made to receive the broadcast of the FM frequency (step 203).

In this state, if the user is satisfied with the received broadcast, the RDS reception process ends. However, when the user wants to receive another broadcast of the same genre, he presses the preset key of the genre (the preset key pressed in step 201) (steps 204 to 205).

As a result, the microcomputer 22 increments j by j + 1 → j (step 206), receives the broadcast frequency of the next rank by the processing of step 203 and thereafter, and thereafter performs the same processing.

When it is desired to receive the broadcast of the frequency stored for each preset key by the normal preset function, a predetermined preset key is directly pressed without operating the enable key for each genre.

Although the case where the present invention is applied to RDS has been described above, the present invention can also be applied to multiple broadcast systems other than RDS.

<Effects of the Invention> As described above, according to the present invention, the program content (genre) and the broadcasting stations broadcasting the program content are stored in the order of the reception electric field in association with each preset key, and in the RDS reception mode,
Among the broadcasting stations broadcasting the program content according to the operated preset key, the broadcasting station with the highest received electric field strength is identified, and the broadcasting from the identified broadcasting station is received. In areas where is applied, it has become possible to receive a broadcast of a desired genre easily with a small number of key operations and in a short time.

[Brief description of the drawings]

FIG. 1 is a block diagram of a radio receiver for implementing the method of the present invention, FIG. 2 is an explanatory diagram of stored contents corresponding to preset keys, and FIG. 3 is a flow chart of processing of the present invention. 17 …… Operation panel, 19 …… Level meter, 20 …… RDS decoder / clock recovery unit, 21 …… Group synchronization / error detection and correction unit, 22 …… Microcomputer, JEK …… Genre-selection enable key, PSK… … Preset keys

Claims (1)

(57) [Claims] 1. A receiving method of a digital data multiplexing system for multiplexing and transmitting various kinds of information including program information in a broadcast signal, in which a program content is stored in association with each preset key and the multiplex information is used by using the multiplex information. The multiplex broadcasting station that broadcasts the program content is sought and stored in order of the received electric field strength, and among the multiplex broadcasting stations that broadcast the program content according to the operated preset key, the multiplex broadcasting station with the highest received field strength A station is identified from the stored contents, a broadcast from the identified multiple broadcast station is received, and a preset key corresponding to the program of the broadcast is operated while receiving the broadcast from the multiple broadcast station. At this time, the multiplex broadcasting station corresponding to the preset key, the multiplex broadcasting station whose reception electric field strength is next to the multiplex broadcasting station currently being received is identified from the stored contents, and the identified multiplex broadcasting station is identified. Method of receiving digital data multiplexing system characterized by receiving a broadcast from the station.