JP2883471B2 - Radio receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an RDS (radio
The present invention relates to a radio receiver capable of receiving data system data.

[0002]

2. Description of the Related Art Conventionally, a radio receiver in which a local oscillation circuit is constituted by a PLL circuit is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-1112, a preset key for designating a preset channel, and a preset channel. A storage device having a corresponding storage area and storing frequency information in the storage area; reading out frequency information corresponding to a preset channel specified by the preset key from the storage device, and providing the frequency information to a local oscillation circuit; I have to.

[0003] Such a radio receiver displays a preset channel together with a reception frequency on a display to facilitate identification of a designated preset channel.

[0004]

However, in the above configuration, for example, at point A, the frequency information of a predetermined broadcasting station is stored in correspondence with preset channel 1, and then moved to point B, and When tuning to the frequency of the preset channel 1, a broadcast station different from the above broadcast station may be received.
Is displayed, the user may have an illusion that the content of the preset channel 1 has changed.

[0005]

A radio receiver according to the present invention specifies a tuner circuit in which a local oscillation circuit is constituted by a PLL circuit, an RDS circuit for extracting RDS data from an output signal of the tuner circuit, and a preset channel. Storage means for storing a frequency information and program recognition information corresponding to the frequency information in the storage area, and a display means for displaying the reception frequency and the preset channel. ,
The frequency information corresponding to the preset channel designated by the preset key is read out from the storage means and transmitted to the tuner circuit, and the reception frequency and the preset channel are displayed on the display means. Control means for detecting program recognition information included in the data, comparing the program recognition information with the program recognition information stored in the storage means, and prohibiting the display of the preset channel when they do not match.

[0006]

The present invention is configured as described above,
When a broadcast station different from the broadcast station at the time of storage in the storage unit is received, display of the preset channel is prohibited.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the R
The use of DS is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-54942, and the outline thereof will be described first. In the RDS, 57 kHz which is the third harmonic of the stereo pilot signal of 19 kHz outside the frequency band of the FM modulation wave is used as a subcarrier, and the subcarrier is filtered and bi-phase coded program contents, etc. Is amplitude-modulated by RDS data indicating information related to the broadcast, and the amplitude-modulated subcarrier is superimposed on the main carrier, and then frequency-modulated and broadcast. As is clear from FIG. 4 showing the baseband coding structure, the RDS data is repeatedly multiplex-transmitted with 104 bits as one group. One group is composed of four blocks each having a 26-bit structure, and each block is composed of a 16-bit information word and a 10-bit check word. FIG. 5 shows the format of one group, where block 1 broadcasts a program recognition (PI) code representing a network, block 2 broadcasts a traffic program recognition (TP) code, and block 3 broadcasts the same program. The station frequency (AF) data of the network station is
In block 4, program service name information (PS) data such as a broadcast station name and a network name are arranged. Further, each group is classified into 16 types of types 0 to 15 by 4 bits according to the contents, and each type (0 to 15) is further classified.
15), two versions of A and B are defined, and these recognition codes are arranged in block 2.

FIG. 1 is a block diagram of a radio receiver according to the present invention, in which (1) is an antenna, and (2) is an FM tuner circuit for inputting a signal of the antenna and outputting an FM demodulated signal. The circuit is constituted by a PLL circuit. (3)
Is an MPX circuit for separating the output signal of the FM tuner circuit (2) into R and L signals, (4) is an amplifier for amplifying the output signal of the MPX circuit, and (5) and (6) are speakers.
(7) is an RDS decoder for demodulating an RDS modulation signal extracted from the FM demodulation output of the FM tuner circuit (2), reproducing a clock, and performing group synchronization and error correction of the demodulated RDS data; As shown in FIG. 2, it comprises a reception frequency display section (8A) and a preset channel display section (8B). (9) is a drive circuit for driving the display (8), (P1) to (P3) are preset keys for specifying preset channels (1 to 3), and (M) is a memory key. (10) is an I / O port for inputting the respective keys, (11) is a CPU,
Each circuit is controlled according to a program written in a program memory (12) consisting of M. (13) is R
A preset memory made up of AM, which has an area corresponding to preset channels (1 to 3), and stores frequency information and a PI code in this area.

FIG. 3 shows a flowchart of a main part of the program written in the program memory (12), and the operation will be described based on the flowchart.

In the above configuration, after operating the memory key (M), the preset keys (P1) to (P3)
Is operated, the frequency information of the broadcast station being received and the P
The I code is stored in the preset memory (13).
It is assumed that the I code is stored.

First, after turning on the power, a preset key (P
When any one of 1) to (P3) is operated, the CPU
(11) reads out frequency information from the area of the preset memory (13) corresponding to the preset channel of the operated preset key, sends it out to the FM tuner circuit (2) and the drive circuit (9), and sends it to the FM tuner circuit (2). Is tuned to the frequency and the display (8) displays the frequency and the preset channel (step S-1).
~ 3). Next, the CPU (11) detects the PI code from the RDS data of the RDS decoder (7), compares the PI code with the PI code stored in the preset memory (13), and if they match, continues the preset channel display. If not, the display of the preset channel is stopped (steps S-4 to S-7). As a result, when a broadcast station different from the broadcast station stored at the time of storage in the preset memory (13) is received, the preset channel is not displayed, and there is no illusion that the preset contents have been changed.

In the above state, the preset key (P1) is again
When any one of (P3) to (P3) is operated, the frequency display,
The display of the preset channel is stopped, and the process returns to step S-2 (steps S-8 and S9).

The RDS is disclosed in JP-A-63-13 / 1988.
As described in Japanese Patent No. 6830, the use of AF data makes it possible to switch to another network station broadcasting the same program when the reception level falls below a predetermined value. When switching to the station, it is preferable to stop the display of the preset channel as described above. In other words, when the switch is switched, the display content of the frequency display section (8A) also changes. Therefore, even in this case, if the preset channel display is continued, it is an illusion that the preset content has been changed.

[0014]

Since the present invention is constructed as described above, when a broadcast station different from the broadcast station at the time of storage in the storage means is received, the display of the preset channel is prohibited. The user can be prevented from illusioning that the preset contents have been changed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a radio receiver according to the present invention.

FIG. 2 is a front view of the display.

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

FIG. 4 is a diagram showing a baseband coding structure of RDS data.

FIG. 5 is a diagram showing a format of one group.

[Explanation of symbols]

 2 FM tuner circuit 7 RDS decoder P1 preset key P2 preset key P3 preset key 8 display 11 CPU 12 program memory 13 preset memory

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-136829 (JP, A) JP-A-63-136828 (JP, A) JP-A-2-291724 (JP, A) JP-A-1- 149528 (JP, A) JP-A 64-54937 (JP, A) JP-A 64-54941 (JP, A) JP-A 61-1112 (JP, A) JP-A 64-54942 (JP, A) JP-A-63-136830 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04B 1/16

Claims (1)

(57) [Claims] 1. A tuner circuit comprising a local oscillation circuit constituted by a PLL circuit, an RDS circuit for extracting RDS data from an output signal of the tuner circuit, a preset key for designating a preset channel, and a storage area corresponding to the preset channel. Storage means for storing frequency information and program recognition information corresponding to the frequency information in the storage area; display means for displaying a reception frequency and a preset channel; and a preset channel corresponding to a preset channel designated by a preset key. Frequency information is read from the storage means and sent to the tuner circuit, and the received frequency and the preset channel are displayed on the display means,
And control means for detecting program recognition information included in the RDS data from the RDS circuit after reception, comparing the program recognition information with the program recognition information stored in the storage means, and prohibiting display of a preset channel when they do not match. A radio receiver.