JPH0534852B2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a vehicle-mounted RDS radio.

<Conventional technology> In order to follow the same broadcast while moving in a car-mounted RDS radio, automatic tracking searches for a frequency with a strong electric field height that is transmitting the same broadcast and updates the reception frequency to this frequency. Systems equipped with this system have been known for some time.

<Problems with the Prior Art> However, with the conventional technology, although it is possible to update the frequency of the broadcast currently being received, it is not possible to update the frequency stored in the preset memory. As a result, broadcasts of the frequencies stored in the preset memory cannot be received at the destination, so a new manual store or auto store must be performed. Furthermore, there is no guarantee that stations of the same series will be preset to the same preset button, and there are drawbacks such as having to search for channels on which stations of the same series are preset while pressing the preset button.

<Summary of the Invention> The present invention has been made to improve the above-mentioned drawbacks of the prior art, and the contents of the preset memory are also updated in accordance with changes in electric field strength, eliminating the need to reset the stored contents. An object of the present invention is to provide an in-vehicle RDS system radio configured such that stations of the same series are always preset to the same preset button. For this purpose, the present invention provides an RDS decoder that demodulates RDS data including a PI code from a received RDS broadcast signal, and an S meter signal output that outputs an S meter signal indicating the electric field strength of the received RDS broadcast. means and multiple
a first storage means capable of storing a plurality of frequency information for receiving RDS broadcasting; and a plurality of frequency information stored in the first storage means.
a second storage means for sequentially receiving RDS broadcasts and storing the level and PI code of the S meter signal corresponding to each frequency information;
Receive RDS broadcasts sequentially, and the RDS received at that time
The broadcast PI code and S meter signal level, and the PI code and S meter signal level stored in the second storage means.
Compare this received meter signal level with
Received with the same PI code as the RDS broadcast
The first frequency information corresponds to an S meter signal level lower than the S meter signal level of RDS broadcasting.
When the frequency information is stored in the storage means of the first storage means, the basic feature is that it has an updating means for rewriting the frequency information stored in the first storage means with the received frequency information.

<Example> An example of the present invention will be described below based on the drawings.

FIG. 1 is its block diagram. 1 and 2 are tuners, and the RDS data received by main tuner 1 and sub tuner 2 via the antenna is
It is decoded by the RDS decoder 4 and input to the microcomputer 5. Main channel 1 and sub tuner 2 also output an S meter that indicates the electric field strength of the broadcast being received.
The meter output is digitized by an A/D converter 6 and input to a microcomputer 5.

The main tuner 1 is provided with a preset memory 3 in which frequencies corresponding to predetermined broadcast stations are stored in advance, and a station is selected and tuned using a preset button (not shown).
That is, each address k corresponding to a preset button
Frequency Fk and PI code are stored in . P.I.
The code is code data sent from the RDS broadcasting station that indicates the same program, and if the PI codes are the same, the programs are also the same.

The microcomputer 5 outputs control signals for controlling the main tuner 1 and sub-tuner 2, and also outputs signals for updating the contents of the preset memory 3.

The microcomputer 5 updates the storage frequency of the preset memory 3 at some timing. This may be performed at regular intervals, or may be performed by an operator's operation. Moreover, it may be started at any other timing.

While the main tuner 1 performs normal reception and audio broadcasting, the microcomputer 5 first controls the sub tuner 2 to sequentially receive all frequencies Fk stored in the preset memory 3.
The electric field strength is inputted from the A/D converter 6 and stored. At the same time, PI from preset memory 3
Input the code and frequency Fk information to create a list 10 as shown in FIG. This list 10
The address k, the PI code, the frequency Fk, and its electric field strength Ek are stored in association with each other.

Next, the microcomputer 5
to control the electric field strength Ek stored in list 10.
Find a broadcast at frequency f that has a field strength e greater than . Specifically, this operation, for example, sequentially receives each inter-office frequency from the lower limit frequency to the upper limit frequency,
This can be done by inputting the S meter output from the A/D converter 6. At the same time, the broadcast of the frequency f is
Compare the PI code with the PI code in List 10, and if they are the same, compare the electric field intensities Ek and e. If e is greater than Ek, replace frequency Fk in list 10 with the searched frequency f. and,
Accordingly, the contents of the preset memory 3 are updated.

As a result of the above, constantly updated frequency information is stored in the preset memory 3.

Next, the operation of the microcomputer 5 will be explained in detail based on the flowchart shown in FIG.

First, select the frequency stored in preset memory 3.
Receive signals F1 to Fn, and record electric field intensities E1 to En (step 50). Then, the reception frequency of the sub-tuner 2 is set to the lower limit frequency, and if reception is possible (steps 51 and 52), the frequency f and the electric field strength e are detected. If reception is not possible, check whether the upper limit frequency has been reached (step 62), and if not, increase the reception frequency by the minimum inter-office frequency (step 63).
Return to step 52. If the upper limit frequency has been reached, the process waits for a certain period of time (step 64) and returns to step 50.

Following step 53, check the PI code. That is, the received PI code of frequency f is sequentially compared with the PI codes of each address k=1 to n stored in the preset memory 3 (steps 55, 56, and 57). Then, if the PI codes are the same, Ek and e at the corresponding address k are compared (step 58), and if e is greater than Ek, the frequency Fk at this address k is updated to the frequency f, and the preset memory is Reopen the contents of step 3 (step 59). and,
Check whether the upper limit frequency has been reached (step
60), if not reached, return to step 52 via step 63. If the upper limit frequency has been reached, it is determined whether or not to cancel the update mode (step 61), and the process returns to step 50 or ends this routine. If e is smaller than Ek in step 58, jump step 59 and proceed to step 60.
to move to. Further, in step 56, an inquiry is made up to address n, and if the same PI code is not found, the process returns to step 63.

Although the receiving frequency is changed from the lower limit to the upper limit in the above operation, the receiving frequency is not limited to this, and any method may be used, such as starting from the frequency set at the office and changing the receiving frequency for the first time.

As described above, in the above configuration, the preset frequency of the preset memory 3 is updated to a frequency with a large electric field strength at a predetermined time, so there is no need to perform manual setting or automatic setting after movement. Furthermore, since broadcasts of the same series are always associated with the same preset button, by pressing the same preset button, you can receive the same broadcast program no matter where you are.

<Effects of the Invention> As explained above, the RDS radio of the present invention includes an RDS decoder that demodulates RDS data including a PI code from a received RDS broadcast signal, and an S meter that indicates the electric field strength of the received RDS broadcast. S-meter signal output means for outputting a signal, and a plurality of
a first storage means capable of storing a plurality of frequency information for receiving RDS broadcasting; and a plurality of frequency information stored in the first storage means.
a second storage means for sequentially receiving RDS broadcasts and storing the level and PI code of the S meter signal corresponding to each frequency information;
Receive RDS broadcasts sequentially, and the RDS received at that time
The broadcast PI code and S meter signal level, and the PI code and S meter signal level stored in the second storage means.
Compare this received meter signal level with
Received with the same PI code as the RDS broadcast
The frequency information corresponding to the S meter signal level lower than the S meter signal level of RDS broadcasting is
If the frequency information stored in the first storage means is stored in the first storage means, the content of the preset memory is also updated based on the electric field strength. It is updated in accordance with changes, so there is no need to reset the stored contents, and the same preset button has the effect of constantly presetting stations of the same series.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a configuration diagram of a list configured inside the microcomputer, and FIG. 3 is a flowchart. 1: Main channel, 2: Sub channel, 3:
Preset memory, 4: RDS decoder, 5: Microcomputer, 6: A/D converter, 10:
list.

Claims (1)

[Claims] 1. An RDS decoder that demodulates RDS data including a PI code from a received RDS broadcast signal; S-meter signal output means that outputs an S-meter signal indicating the electric field strength of the received RDS broadcast. ; a first storage means capable of storing a plurality of pieces of frequency information for receiving a plurality of RDS broadcasts; and a first storage means capable of storing a plurality of pieces of frequency information for receiving a plurality of RDS broadcasts; a second storage means for respectively storing the level and PI code of the S meter signal in accordance with the frequency information; receiving receivable RDS broadcasts in sequence, and storing the PI code and S meter signal of the received RDS broadcast;
The meter signal level is compared with the PI code and S meter signal level stored in the second storage means, and the S meter signal level of the received RDS broadcast with the same PI code as this received RDS broadcast is determined. If frequency information corresponding to a lower S meter signal level is stored in the first storage means, updating means for rewriting the frequency information stored in the first storage means with the received frequency information; An in-vehicle RDS system radio characterized by being equipped with;