JP2774984B2 - RDS receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RDS receiver capable of receiving an RDS broadcast.

[0002]

2. Description of the Related Art In recent years, RDS, which multiplexes digital data for channel selection, broadcast station display, and the like with an FM radio signal, has received attention. As shown in FIG. 6, the RDS data includes four blocks as one group, and the first block always includes a PI code (Programming identification).
code) (program identification code), and the second block is an address block indicating what is written in the third and fourth blocks.

[0003] Some RDS messages are called PTY codes (program type codes), which are used to identify program contents, for example, news, light music, education, and sports. Send.

A method using this PTY code is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-62923. When a user selects a desired PTY code, the user can search for a station transmitting the same PTY code and listen to a desired program.

[0005]

However, according to the above method, a desired PTY code is selected by an up / down key or the like, and the PTY code search is then performed by operating a search key or the like. Therefore, in the search, for example, when a search is performed by selecting news, but the station is not found, and the next time a sport is selected, the PTY code of this sport is selected again with the up / down key and then the search key is operated. Must be very inconvenient.

[0006]

An RDS receiver according to the present invention comprises: an FM tuner circuit; an RDS decoder for decoding RDS data from an output signal of the FM tuner circuit;
An audio circuit that reproduces an output signal of the FM tuner circuit and drives a speaker; a plurality of preset keys;
Storage means for storing frequency information given to the FM tuner circuit in correspondence with the preset key; selection means for selecting a program type (PTY) code;
Means for setting a Y code reception mode; and when the PTY code is selected by the selection means, the storage means further stores the selected PTY code in response to the operation of the preset key; Control means for reading out a PTY code corresponding to the preset key from the storage means when the preset key is operated in the reception mode, and searching for a station including the PTY code in RDS data. It is.

[0007]

According to the present invention, a station transmitting the same PTY code as a previously stored PTY code corresponding to the preset key is operated by operating the preset key. Can be.

[0008]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of an RDS receiver according to the present invention. (1) is an FM tuner circuit which receives a signal from an antenna (2) and outputs an FM demodulated signal, and a local oscillation circuit is constituted by a PLL synthesizer. . (3) an MPX circuit for separating the output signals R and L of the FM tuner circuit (1);
(4) an amplifier for amplifying the output signal of the MPX circuit;
(5) (5) is a speaker. (6) demodulates the RDS modulated signal extracted from the FM demodulated output of the FM tuner circuit (1), reproduces the clock, and demodulates the RDS modulated signal.
An RDS decoder that performs group synchronization and error correction of DS data. (7) The display dot matrix type, (8), preset key (P ₁₎ ~ (P _6), the key circuit consisting of a set key (SET) and PTY key (PTY), (9) a data memory , (10) are microprocessors for controlling each circuit according to a program written in advance.

FIG. 2 is a front view of the RDS receiver. The display (7), the preset keys (P ₁ ) to (P ₆ ), the set key (SET) and the PTY key (PTY) are shown in FIG. Are located in

FIGS. 3 to 5 show flowcharts of the main part programs written in the microprocessor (10), and the operation will be described based on the flowcharts. First, when the power is turned on, the microprocessor (10) sets the flag n to 0 and sets the preset key (P ₁ ) to
The operation of (P ₆ ) is monitored and the preset keys (P ₁ ) to (P
_When any one of ₆ ) is operated, the frequency information stored in advance in the data memory (9) is provided to the FM tuner circuit (1) and the frequency is displayed on the display (7) (step). S-1 to 3). The microprocessor (10) also monitors the operation of the PTY key (PTY), and detects the operation time when the PTY key (PTY) is operated (steps S-12, S13). here,
If the operation time is 2 seconds or more, the program type name is displayed on the display (7) every 2 seconds (step S-1).
4). The relationship between the PTY code and the program type name is determined as shown in FIG.

When any of the preset keys is operated while a predetermined program type is displayed, the PTY code of the program type and the number of the preset key (the number of the priority order) are displayed. The corresponding data is stored in the data memory (9) (step S-15).
Thereafter, all PTs 1 to 6 are processed in the same procedure.
When the Y code is stored in the data memory (9) or the set key (SET) is operated, the reception frequency is displayed again on the display (7), the flag n is set to 1, and the process returns to step S-2. (Steps S-16 and S17). Here, if the PTY key (PTY) is operated again and the operation is performed for less than 2 seconds, the microprocessor (10)
Performs a search in the reception band, and stores the PTY code and frequency information in the data memory each time an RDS station is received. If a station that transmits the same PTY code as the preset first PTY code is received before making one round in the reception band, search stop is performed at that station and the program type name is displayed on the display (7). And returns to step S-2. (Steps S-18 to S22). If the station having the first PTY code is not found after making a round in the reception band, the station having the same PTY code as the preset second PTY code among the searched RDS stations is stored in the data memory (9). Detect whether it is stored or not,
If the station exists, the frequency information of the station is given to the FM tuner circuit (1) and the program type name is displayed on the display (7) (steps S-23, S24, S30).
Thus, if the station with the second PTY code does not exist,
Next, the same processing is performed on the third PTY code, and thereafter, the same processing is performed on the fourth, fifth, and sixth PTY codes (steps S-25 to S28, S30). As a result, the P specified in steps S-14 to S-16
The RDS stations are automatically detected in the order of the TY code. If the station with the sixth PTY code cannot be detected, the station returns to the station that was received before the search (step S).
-29).

Next, once the processing of steps S-14 to S17 is performed, when the electric field level of the receiving station becomes lower than the predetermined level, the processing of steps S-19 to S30 is performed as described above (step S-4) 5). Also, set key (SET)
After the operation of, if any of the preset keys are operated,
A search is made for a station transmitting the same PTY code as the PTY code of that number. If there is such a station, the search is stopped there and the program name is displayed. The process returns to the previous receiving station (steps S-6 to S-11).

In the embodiment of the present invention, when the reception level becomes lower than the predetermined level, steps S-19 to S-19 are performed.
0 search processing, but the PTY of the receiving station
It is detected whether unused frequency information having the same PTY code as the code is stored in the data memory, and if it is stored, tuning control is performed at the station. May be detected whether or not the frequency information having the PTY code is stored in the data memory. Further, if unused frequency information having the same PTY code as that of the receiving station is not stored in the data memory, a search is performed and the station transmitting the same PTY code as that of the receiving station is searched. The detection may be performed, and if there is no such station, it may be detected whether or not the frequency information having the next-highest PTY code is stored in the data memory.

[0014]

According to the present invention, a station transmitting the same PTY code as a previously stored PTY code corresponding to the preset key is operated by operating the preset key. Once the PT
By storing the Y code in the second storage means in correspondence with the preset key, it is not necessary to select the PTY each time the search is performed, so that an RDS receiver with good operability, particularly suitable for in-vehicle use can be provided. . In addition, PT
Since the Y code can be stored, that is, the user's favorite PTY code can be selectively stored, so that even when the number of preset keys is small, it is possible to cope with the trouble.

[Brief description of the drawings]

FIG. 1 is a block diagram of an RDS receiver of the present invention.

FIG. 2 is a front view of the RDS receiver.

FIG. 3 is a flowchart of a main part program similarly written in the microprocessor.

FIG. 4 is a flowchart of a main part program similarly written in the microprocessor.

FIG. 5 is a flowchart of a main part program similarly written in the microprocessor.

FIG. 6 is a diagram showing a format of RDS data.

FIG. 7 is a diagram showing a relationship between PTY and a program type.

[Explanation of symbols]

 Reference Signs List 1 FM tuner circuit 6 RDS decoder 9 Data memory 10 Microprocessor

Continuation of the front page (72) Inventor Koichi Murakami 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (JP, A) JP-A-64-69125 (JP, A) JP-A-63-136828 (JP, A) JP-A-63-136829 (JP, A)

Claims (1)

(57) [Claims] 1. An FM tuner circuit, an RDS decoder for decoding RDS data from an output signal of the FM tuner circuit, an audio circuit for reproducing an output signal of the FM tuner circuit to drive a speaker, and a plurality of preset keys First storage means for storing frequency information given to the FM tuner circuit corresponding to the preset key, selection means for selecting a program type (PTY), means for setting a PTY reception mode, PT of PTY by the selection means is said selected second storage means in response to operation of said preset key when it is selected
When the preset key is operated when the Y code is stored and the PTY reception mode is set, a PTY code corresponding to the preset key is read from the second storage means, and a station containing the PTY code in the RDS data is read. Characterized by comprising control means for searching for
S receiver.