JPH0653782A - Car radio - Google Patents

Abstract

PURPOSE: To provide a new car radio having an RDS decoder which can be used without losing the alternate frequency of a program before first switching to the different program to be selected. CONSTITUTION: The output memory 10 of an RDS demodulator 7 stores plural pieces of RDS data demodulated at the connection time of the block 3 of an RDS telegram group 14A during that time. Data are transferred into an EON memory. The frequency of the broadcast station of the different program can be used in the first part 11 of the EON memory and the PI code of the different program in a second part 12. Data on the frequency of the different program used in the output memory or the EON memory is read under the PI code belonging to the program. Thus, the alternate frequency of the different program is prevented from being lost even if only the alternate frequency of the first program is continuously set.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a new car radio having an RDS decoder.

[0002]

2. Description of the Related Art Radio data systems (Radio-Da)
ten-Systems, RDSDIN EN5006
In the case of the definition of 7), the indicator for the frequency of another broadcasting station −
By this sign, so-called alternative frequency (AF) -radiation is meant, in which the program just set is also received. Alongside this, an indicator was also defined for the frequencies at which another program at the same broadcast facility could be received. This latter frequency transmission means that, for example, at the time of a program announcement, when the listener feels that he or she is requested to receive another program by using his / her own key, another program of the same broadcasting station is transmitted. Should be facilitated.

These EON frequency data are transmitted in the group 14 of RDS data telegrams. In this case, E
The fact that the ON frequency is targeted can be seen in particular by: That is, it can be seen that the order of the frequency and the program indicator symbol (PI code) is opposite to that of the transmission of the AF indicator which enables the just received program to be received. The latter AF indicator is transmitted in the group OA and is further ordered here by PI code / frequency. On the other hand, the EON indicator is transmitted in block 3 of group 14 where the frequency / PI code order is maintained.

The EON label has a very low frequency (10
%) Into the RDS data telegram. Therefore, the received EON sign is EON on the car radio.
It is stored in temporary memory until the next switch to another receive frequency, whether this switch is initiated manually or automatically. After switching each broadcasting station,
The new EON indicator is read into the EON temporary memory.

The latter, for example, the car radio has a good reception quality, which is automatically obtained in advance and stored in the background memory of the tuning section, when the reception quality of the set broadcasting station is too low. Switch to alternate frequency.

During a manual switch to an entirely different program, this program is occasionally received at a lower quality by the station of this other program, whose frequency can be retrieved by the device from the EON memory. Moreover, in this case, the alternative frequency for the newly set program is also not properly received via this broadcast station and is therefore not reliably encoded.

[0007]

Therefore, the problems of the present invention are as follows.
Without presetting the station for this other program, and thus without having to receive its AF indicator, various EO
To find a means to collect N frequencies.

[0008]

This problem is solved by the structure of the characterizing portion of claim 1.

[0009]

Embodiments of the present invention will be described below with reference to block diagrams.

RD of the broadcasting station set in the tuning unit 1
The S data telegram is received via the antenna 2, prepared in the high-frequency stage 3, the intermediate-frequency stage 4 and the demodulator 5, and then passed through the 57 KHz filter 6 to the RDS demodulator 7.
Be guided to. The RDS demodulator 7 contains all the circuit stages required to synchronize it with the received data telegram. These circuit stages are known in the art and are not shown here.

In parallel with this, the low frequency signal taken out from the demodulator 5 is amplified in the low frequency stage 8 and reproduced through the speaker 9.

An output memory 10 is provided on the output side of the RDS demodulator 7.
Is provided. This memory is at a given clock time, that is to say block 3 of group 14A of the RDS telegram.
During the duration of, a plurality of RDS data demodulated at this time is accommodated. These data are transferred into the EON memory. After that, in the first part 11 of the EON memory, the frequency of the broadcast station of another program and the second
The PI code of another program in the section 12 is available for the same broadcasting facility.

The premise of the present invention is that the tuning unit 1 is the background memory 1.
3, the background memory having memory cells 14 to 14n for a number of PI codes and a number of memory cells 15 to 15n for an alternative frequency AF, which are connected afterwards. . In this background memory, it is known to store a plurality of unique AFs transmitted from a received broadcast station under the PI code of the received broadcast station. When one alternative frequency should be set, the tuning unit 1
It relies on these stored data in a manner not shown here.

When manually switching programs, the tuning unit 1
Depends on the AF belonging to the PI code of the newly received program stored in the background memory. However, this memory area is empty when the program was not previously set. Therefore, in this case, a plurality of frequencies stored in the EON memory are used for setting purposes in this device when switching programs. However, this EON memory is erased every time the broadcasting station is switched,
Therefore, EON information is lost.

According to the present invention, the data relating to the frequency of another program used in the output memory 10 or the EON memories 11 and 12 in the background memory is also the PI code belonging to each of these other programs. Read under.

In the case of automatically switching to another alternative frequency of the program which has just been set and is to be received thereafter,
The new EON frequency transmitted during the above clock time by the newly set frequency is read into the background memory, thus increasing the number of stored frequencies; because usually it is just now. This is because the frequency at which another program can be received is switched along with the alternative frequency of the received program. Therefore, even when only the alternative frequency of the first program is set one after another, the alternative frequency of another program is collected without being lost by the alternative frequency that is switched while already receiving the first program. .

Therefore, when switching from the first program to the second program, the list of the alternative frequencies of the second program can be used in the car radio.

The output side of the first partial memory 11 of the EON temporary memory is connected to the frequency input stage of the background memory 13 for the purpose of accepting the frequency transmitted in the block 3 of the group 14 in the RDS data telegram into the background memory. 17
Connected with. This frequency input stage is controlled by the comparison circuit 18. This comparison circuit is connected on the one hand to the second part of the EON temporary memory and on the other hand to the PI code memory cell 14 via the selection switch 16. The comparison circuit 18 causes the following operation. That is, the frequency input side 17 of the background memory is connected to the second partial memory 12
It is operated so as to be conductively connected to the frequency memory cell 15 assigned to the PI code existing in the.

In an expanded embodiment of the invention, the frequency applied to the input side 17 of the background memory 13 is such that, before being transferred to the memory cell 15, the frequency already stored in this memory cell is first of all stored. And the former frequency is filed only if the former frequency is not already present in the latter frequency.

For this purpose, a cutoff switch 19 is provided on the input side of the frequency input stage 17. This switch is released only at the next time. That is, only when the frequency comparison circuit 20 detects a mismatch between the contents of all the memory cells 15-these are assigned to the PI code and is interrogated via the selection switch 21-and the frequency applied to the frequency input side. be opened.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Tuning Unit 2 Antenna 3 High Frequency Stage 4 Intermediate Frequency Stage 5 Demodulator 6 57KHz Filter 7 RDS Decoder 8 Low Frequency Stage 9 Speaker 10 RDS Decoder Output Memory 11 EON Frequency Memory 12 EON-PI Code Memory 13 Background Memory for Tuning Unit 14 PI code memory cell 15 AF memory cell 16 Selection switch for PI code 17 Frequency input side of background memory 18 Comparator for PI code 19 Break switch 20 Comparator for frequency data 21 Selection switch for frequency data

Claims (3)

[Claims] 1. A car radio equipped with an RDS decoder and a tuning section including a background memory, wherein a group OA of RDS data telegrams belonging to a program set in each case is included in the background memory. The alternative frequency transmitted in R
Another program (EON) in the background memory (13) transmitted in the group 14 of RDS data telegrams in a car radio in the form stored via the DS decoder
Frequency of the memory cell (1
A car radio characterized by being stored in 5). 2. The reception frequency of another program transmitted in the group 14 is already stored in the assigned memory cell (15) before it is stored in the background memory (13). 2. The car radio of claim 1, which is compared to the frequency being played. 3. A car radio having an RDS decoder and a tuning unit, said RDS decoder also transmitting an alternative frequency (AF) of a set program transmitted in a group OA of RDS data telegrams as well as an RDS. The reception frequency of another program (EON) transmitted in the group of data telegrams 14 is also determined, said tuning unit also including a background memory, in which the alternative frequency received each time. (AF) is stored undisturbed and when switching to another alternative frequency (AF) should take place,
In a car radio of the type whose memory is used by the tuning unit, temporary memory for the frequencies of other programs transmitted in the group 14 is occasionally connected with the frequency input (17) of the background memory (13). And in addition, temporary memory for the PI code transmitted in the group 14 with the frequency,
A car radio characterized by controlling reading of a reception frequency applied to a frequency input side of a background memory into a memory area assigned to this PI code.