JPH05275980A - Radio receiver - Google Patents

Abstract

PURPOSE:To automatically preset data related to frequency by detecting the broadcast station identifying code of a receivable station, which is detected by a seek means, by a broadcast station discrimination code detecting means. CONSTITUTION:The reception frequency is successively changed by a controller 10 to search receivable stations whose reception levels are higher than a prescribed value; and when receivable stations are found, their broadcast station identifying (PI) codes and reception levels are checked, and frequencies of stations having the same PI code are stored in a preset memory correspondingly to the same channel, and stations different by PI codes are assigned to respective preset buttons. That is PI codes (PI1, -, PI3, PI2, and PI4) different from one another are assigned to channels(CH) 1 to 6 corresponding to preset buttons, and frequencies of stations having the same PI code are stored for the same Ch, and the frequency of the station having the highest reception level out of stations having the PI codes corresponding to each Ch is first stored, and the highest level value is stored correspondingly to each Ch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver used in a radio data system (RDS) which has been put into practical use in Europe.

[0002]

2. Description of the Related Art RDS put to practical use in Europe
Is a system that multiplex-transmits various data to FM broadcasting, and that the receiving side can enjoy various services by using the multiplex-transmitted data. Broadcasting station identification code (PI code), alternative to the same network as various data There is a frequency list (AF list). FIG. 1 shows an outline of a main part of an RDS radio receiver. In FIG. 1, 1 is F
An antenna for receiving M multiplex broadcast waves, 2 a front end for selecting a desired station and converting it to an intermediate frequency (IF), 3 an IF amplifier for amplifying an IF signal, 4 a PLL synthesizer, and this PLL A desired station can be selected by changing the frequency division ratio data set in the variable frequency divider in the synthesizer 4. Reference numeral 5 is an FM detection circuit. The output of the FM detection circuit 5 is supplied to the demodulation circuit 6 and separated into left and right stereo signals. Reference numeral 7 is a filter for extracting a radio data signal from the detection output of the FM detection circuit 5. The output of this filter 7 is demodulated by the demodulation circuit 8 and the coded radio data is generated by the decoder 9. Reference numeral 10 is a controller including a microcomputer, etc., and the radio data generated by the decoder 9 is stored in the memory in the controller 10 and used for various controls. Further, the output of the IF amplifier 3 is input to the controller 10, and the reception level is determined. Reference numeral 11 denotes a channel selection unit having a plurality of preset buttons. When a predetermined preset button is operated, the PLL synthesizer 4 is tuned so as to tune to a predetermined frequency based on the reception frequency related data stored in memory corresponding to the preset button. The division ratio data is set in the divider.

FIG. 2 shows various data stored in the memory in the controller 10. The reception frequency f _{00 of} the currently received broadcast, the broadcast station identification code (PI code) PI _{0 of} the currently received broadcast, and the alternative frequency list (AF list) of the same network as the currently received broadcast are stored in the memory.
f ₀₁ , f ₀₂ , f ₀₃ , f ₀₄ , f _05, ..., PI codes of other networks and AF lists (PI ₁ , f ₁₀ , f ₁₁ ,
f ₁₂ , f ₁₃ ...), (PI ₂ , f ₂₀ , f ₂₁ , f ₂₂ , f _{22
23, f 24, ···),} ···· and the like are stored.

FIG. 3 shows the relationship between the reception frequency at a reception point and its reception level. As shown in FIG. 3, at this point, the reception frequency f ₁ (PI code: PI ₁ ), the reception frequency f ₂ (PI code: PI ₁ ),
Reception frequency f ₃ (PI code: PI _2), the receiving frequency f ₄
(PI code: PI ₁ ), reception frequency f ₅ (PI code:
PI ₃ ), reception frequency f ₆ (PI code: none), ...
.., the station of the reception frequency f ₉ (PI code: PI ₄ ) can receive.

FIG. 7 shows the reception state shown in FIG.
Conventional radio reception when auto preset operation is performed
Data stored in the preset memory in the controller of the machine.
The data is shown in tabular form. Conventional radio receiver
The auto preset operation in the
Wave number (f_MIN) To the highest frequency (f_MAX) Up to a predetermined frequency
Seek by increasing the number of each
While searching, the reception level is detected and the reception level
Select the top 6 stations with high
To store the frequency related data in the memory
In the reception state shown in FIG. 3, as shown in FIG.
Channel 1 corresponding to the set button "1" has a reception frequency
f₁(PI code: PI₁) Frequency related data is stored
And channel 2 receives frequency f_Four(PI code: P
I₁), The reception frequency f for channel 3₆(PI code:
None), the reception frequency f for channel 4₂(PI Co
Do: PI ₁), The reception frequency f for channel 5_Five(PIco
Code: PI₃), The reception frequency f for channel 6₃(PI
Code: PI₂) Each frequency related data is stored
It is what is done. Therefore, press the preset button "1"
Then, the reception frequency f₁Stations can receive and preset
When button “3” is operated, the reception frequency f₆Stations can receive
It is something.

[0006]

However, the auto preset operation of the conventional radio receiver for RDS described above is as follows.
Since a predetermined number of receivable stations detected by the seek operation are stored from the highest receiving level, the stations having the same broadcasting station identification code (hence the broadcasting stations having the same contents)
Will be stored in multiple stations (in the example shown in FIG. 7,
The stations stored in channels 1, 2, and 4 have the same PI code), and there is a problem in that the usability is poor.

The present invention solves the above-mentioned conventional problems and provides a radio receiver in which receivable stations having the same broadcast station identification code can preset to the same preset button.

[0008]

In order to achieve the above object, the present invention is directed to seek means for searching a receivable station, and a broadcast station for detecting a broadcast station identification code of the receivable station detected by the seek means. Identification code detection means, a plurality of preset buttons corresponding to the broadcast station identification code, and reception frequency related data of the receivable stations detected by the seek means, the broadcast station identification code detected by the broadcast station identification code detection means And a storage means for storing the data corresponding to the above.

[0009]

The present invention has the above-mentioned structure, and detects the broadcast station identification code of the receivable station detected by the seek means by the broadcast station identification code detection means, and corresponds to the detected broadcast station identification code. Therefore, frequency-related data can be automatically preset corresponding to the preset button, and therefore, the selection of a broadcasting station having the same broadcasting station identification code can be performed by the same preset button operation.

[0010]

EXAMPLE An example of the present invention will be described below.
The hardware configuration of the radio receiver of this embodiment is the same as that shown in FIG. 1, and the function of auto-preset by the controller 10 is different from that of the conventional example.

Next, the radio receiver of the above embodiment is turned on.
The preset operation will be described with reference to FIG. Figure
4 is an auto preset memory in the controller 10
It shows the operation. In FIG. 4, in step a, the memory
To clear. Next, in step b, the lowest frequency in the band
(F_MIN) PLL frequency synthesizer
Set to 4 and start seek operation. In step c
Cycle has completed one cycle, that is, the set frequency is the lowest frequency
Number (f_MIN) To the highest frequency (f_MAX) Judging whether or not
To do. If the seek operation has completed one round in the judgment of step c
When the determination is made, the auto memory operation ends. Step c
If it is determined that the seek operation has not completed one cycle in step
Proceed to d and receive level of the frequency set in step b.
Is determined to be a predetermined value or more. It is determined that there is no station in step d
Then, go to step e and set the reception frequency to the specified frequency.
And the process returns to step c. The above steps a, b,
The reception frequency is the lowest frequency f according to c, d, and e_MINKarakoro
While increasing the frequency by a constant frequency, the reception level is above the specified value.
You will be looking for a station. The reception frequency is f in FIG. ₁To
When set, it is determined that there is a station in step d
Proceed to f and receive frequency f₁Radio obtained by receiving
Check the PI code of the data and check the reception level.
Check the le. Next, in step g, the PI code is obtained
It is judged whether it was hit. If you cannot get the PI code here
To step l, it is determined that the PI code is obtained.
Then, the process proceeds to step h, and the PI
Whether the card is already in the preset memory shown in FIG.
Is determined. If "No" is determined in step h,
Proceed to step l, and in step h, "Yes" is determined.
Then, the process proceeds to step i, and the reception detected in step f
The level has already been stored in the preset memory shown in FIG.
It is determined whether the received level is higher than the received level. This station
If it is determined to be "No" in step i, the process proceeds to step k, and
If "Yes" is determined, the process proceeds to step j. Step
In preset j, the preset memory already stored in the preset memory is
Memory area, that is, the PI code obtained in step f.
Frequency f at the beginning of the frequency memory area corresponding to₁Calligraphy
Already stored in preset memory
Change the reception level to the reception level detected in step f.
To be new. In step k, same in preset memory
Write the received frequency in the frequency memory area with the PI code of
Imprint At this time, the frequency memory area is full and writing is possible
If there is no appropriate memory area, write the frequency
Yes. In step l, the free memory of the preset memory is
Write the frequency in the frequency memory area of the channel (Ch)
Mu. In addition, the free channel (Ch) in step l
If not, the reception level is compared and the reception level is higher.
Write the reception frequency. The processing of steps j, k, and l is completed.
When finished, go to step m and write to the preset memory.
The received levels are compared to sort by the received level.
And the reception level is closer to the channel (Ch) 1 side.
Sort so that it becomes higher. Sorty of step m
When the ringing ends, the process returns to step e and the reception frequency is
After stepping up, the same processing as described above is performed.

As described above, in the above embodiment, the reception frequency is sequentially changed while searching for a receivable station whose reception level is equal to or higher than a predetermined value. If there is a receivable station, the PI code of the station is received. And the reception level is checked, and the frequencies of stations having the same PI code are stored in the preset memory in association with the same channel, and stations having different PI codes are assigned to each preset button. FIG. 5 is FIG.
When the station shown in FIG. 2 exists, the data stored in the preset memory is shown in a table format, and the channels (Ch) 1, 2, 3, 4, 5, 6 corresponding to the preset buttons are shown.
For different PI codes (PI ₁ ,-, PI ₃ , P
I ₂ , PI ₄ ) are allocated, the frequencies of the stations having the same PI code are stored in the same channel (Ch), and the reception level is the highest among the stations having the PI code corresponding to each channel (Ch). The frequency of the station is stored at the head, and the highest level value is stored corresponding to each channel (Ch). For example, in FIG. 5, the PI code (PI ₁ ) is assigned to channel 1 (corresponding to preset button ₁ ).
Is allocated, the frequencies f ₁ , f ₂ , f ₄ of the receivable stations of the station of the PI code (PI ₁ ) are stored in correspondence with the channel 1, and among the reception frequencies f ₁ , f ₂ , f ₄ . The frequency (f ₁ ) of the station having the highest reception level is stored at the head, and the level (l ₁ ) is also stored in association with channel 1.

FIG. 6 shows a process of selecting an auto-preset station. In FIG. 6, when a predetermined preset button is operated in step a, it is determined whether the PI code is stored in the channel (Ch) corresponding to the preset button operated in step b. PI in this judgment
If it is determined that the code is stored, step c
Then, the frequency level stored in the memory is checked, the upper 4 stations having the highest level are selected, and the process proceeds to step d. Step d
Then, P of the station with the highest level among the top four stations selected
Check the I code and proceed to step e. In step e, it is determined whether the PI code detected in step d matches the PI code stored in memory corresponding to the operated preset button. If it is determined that the PI code matches,
Proceeding to step g, the process of tuning to the target frequency is performed in step d, and the tuning process is terminated. When it is determined in step e that the PI codes do not match, in step f, the PIs of the upper four stations selected in step c are selected.
If it is determined that the code comparison is completed, and if it is determined that the code comparison is completed, the process proceeds to step h to perform a process of tuning to the first frequency stored in the memory corresponding to the operated preset button. The station processing ends. On the other hand, if it is determined in step f that the comparison of the PI codes of the upper four stations has not been completed, the process returns to step d, the PI code of the station with the next higher level is checked, and the same operation as above is repeated thereafter. In step b, P is assigned to the corresponding channel (Ch).
When it is determined that the I code is not stored,
In step h, the frequency division ratio data is set in the variable frequency divider of the PLL synthesizer 4 so as to tune to the first frequency stored in the memory, and the processing is ended.

For example, as shown in FIG. 5, when the preset button "1" is operated in the state where various data are stored in the preset memory, the PI code (PI ₁ ) corresponding to channel 1 is stored. , The determination in step b is “Yes”, and in step c, the frequency f ₁ ,
The reception levels of f ₂ and f ₄ are checked, and in step d, the PI code of the station with the highest reception level (station of frequency f ₁ ) is checked. If the PI code is PI ₁ in step d, it is determined whether this PI code PI ₁ matches the PI code PI ₁ stored in the memory. This judgment is "Yes"
, So that the frequency f ₁ is tuned in step g, P
Frequency division ratio data is set in the variable frequency divider of the LL synthesizer 4. On the other hand, when the preset button “2” is operated, since the PI code is not stored in the channel 2 as apparent from FIG. 5, it is determined as “No” in step b of FIG. Then, the process goes to step 2 to set the frequency division ratio in the variable frequency divider of the PLL synthesizer 4 so as to tune to the frequency f ₆ stored in the beginning of the channel 2.

[0015]

According to the present invention having the above-mentioned structure, the reception frequency related data of the broadcasting stations having the same broadcasting station identification code is stored in the preset button set corresponding to the broadcasting station identification code. It has the advantage that

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a radio receiver according to an embodiment of the present invention.

FIG. 2 is a diagram showing various data stored in a memory of the radio receiver.

FIG. 3 is a diagram showing a relationship between a reception frequency and a reception level.

FIG. 4 is a flowchart of an auto preset operation of the radio receiver.

FIG. 5 is a diagram showing a storage state by auto preset of the radio receiver.

FIG. 6 is a flowchart of a channel selection operation of the radio receiver.

FIG. 7 is a diagram showing a storage state by auto preset of a conventional radio receiver.

[Explanation of symbols]

 1 Antenna 2 Front End 3 IF Amplifier 4 PLL Synthesizer 5 FM Detection Circuit 6 Demodulation Circuit 7 Filter 8 Demodulation Circuit 9 Decoder 10 Controller 11 Channel Selection Section

Claims (4)

[Claims] 1. A seek means for searching a receivable station, a broadcast station identification code detecting means for detecting a broadcast station identification code of the receivable station detected by the seek means, and a plurality of presets corresponding to the broadcast station identification codes. Radio reception comprising a button and storage means for storing the reception frequency related data of the receivable station detected by the seek means in association with the broadcast station identification code detected by the broadcast station identification code detection means. Machine. 2. For each preset button, a broadcast station identification code, reception frequency data of one or a plurality of receivable stations belonging to this broadcast station identification code, and the most receivable station among the plurality of receivable stations 2. The radio receiver according to claim 1, wherein the reception level of a station having a high level is stored in the storage means. 3. The radio receiver according to claim 1, further comprising storage means for storing a plurality of reception frequency related data detected by said seek means for a broadcasting station identification code. 4. When the preset button is operated, a selection is made to select a station having the highest reception level among a plurality of stations having the same broadcast station identification code stored in the storage means corresponding to the preset button. A radio receiver as claimed in claim 1, comprising station means.