JPH098606A - On-vehicle rds receiver - Google Patents

Abstract

PURPOSE: To enable reception from the station of any prescribed category with best sensitivity by automatically storing the station having high reception intensity in a memory corresponding to a prescribed PI code when the position of reception is changed by the move of a car. CONSTITUTION: A receiver mounted on the traveling car receives a radio wave from a broadcasting station and that signal is passed through a front end 2, converted to an intermediate frequency by an IF/DET 4, detected later, passed through a muting circuit 6 and outputted from a speaker 8. Tuning at the receiver is performed by controlling a PLL 3 while using a microcomputer 11 and by providing the desired reception frequency of the front end 2. When searching the receiving station, the muting circuit 6 for blocking noise generation is operated. Broadcasting from the broadcasting station to be received is detected by a received signal intensity detection circuit 9, program contents are discriminated, and the broadcasting station to be received is decided and stored in a memory 13. Signal intensity is compared and the microcomputer 11 performs control for receiving the more satisfactory frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle RDS receiver.

[0002]

2. Description of the Related Art The preset function of a conventional radio receiver is that the user himself / herself stores a favorite broadcasting station in an arbitrary preset channel and the user can directly call the favorite broadcasting station.

[0003]

However, in the on-vehicle receiver, when the receiving area is moved, the preset program broadcasting station may have a poor receiving state. Therefore, it was necessary to newly specify the manual store or the auto store at the destination. Therefore, there is no guarantee that the same program broadcast station will be preset in the same preset channel, and there is a drawback that the same program broadcast station must be searched while pressing the preset button.

[0004]

According to the present invention, in a receiver for receiving an RDS broadcast, there is provided a first storage means for storing a plurality of frequency information and a received signal strength level for receiving the broadcast, and the first storage means. Second storage means for storing the frequency information stored in the storage means for each area, and a plurality of RDs according to the frequency information stored in the first storage means
S Broadcast station received and received signal P corresponding to the received frequency
Third storage means for respectively storing the I code and frequency information, and reception of a broadcast in which the reception signal level stored in the first storage means is sequentially received and the reception signal level stored in the first storage means is newly received. When the received signal strength level is lower than the signal strength level, the combination of the PI code and the frequency information stored in the third storage means is searched from the area list of the second storage means stored for each area. The in-vehicle RDS receiver is provided with an updating unit that rewrites the frequency information and PI code content of the matched area in the first storage unit.

Further, the present invention uses the signal of RDS broadcast to PI.
An RDS decoder that demodulates RDS data including a code, a received signal strength detection circuit that detects a received signal strength of a received broadcast of an RDS broadcasting station, and a plurality of frequency information for receiving broadcasting of a plurality of RDS broadcasting stations. A plurality of first storage means for storing, a second storage means for storing the frequency information stored in the first storage means for each area, and a plurality of storages according to the frequency information stored in the first storage means RDS stored in the first storage means and third storage means for receiving the broadcast of the RDS broadcasting station and storing the level of the received signal strength and the PI code corresponding to each frequency.
A received signal lower than the received signal strength level of the received RDS broadcast station is compared by comparing the received signal strength levels stored in the first storage means with the received broadcasts of the same PI code as the DS broadcast station. When frequency information corresponding to the intensity level is stored in the first storage means, the frequency information stored in the first storage means is stored in the second storage means, and stored in the first storage means. An in-vehicle RDS receiver having update means for comparing the stored frequency information with the frequency list for each area of the third storage means and the second storage means to determine the area and rewrite it to the frequency information of the area. .

[0006]

According to the present invention, when the receiving position of the on-vehicle receiver changes due to the movement of the vehicle, the preset receiving state of the program broadcasting station is the best for each channel of the same series program in the receiving area where the program is currently running. It can be configured as a preset content, and when selecting a channel for each broadcast genre, it is possible to receive a station of a predetermined genre having the best sensitivity in a traveling area.

[0007]

An embodiment of the present invention will be described. FIG. 1 is a block diagram of an in-vehicle RDS receiver of the present invention, and FIG. 2 is a flowchart showing a receiving operation of the in-vehicle RDS receiver of the present invention,
FIG. 3 is a diagram showing the contents of the list stored in the memory 13.

A signal obtained by receiving a radio wave from a broadcasting station from an antenna 1 of a receiver mounted on a running automobile is detected by an IF / DET 4 after being converted to an intermediate frequency via a front end 2 and then detected via a volume 5. Muting circuit 6
Then, the signal is amplified by the amplifier 7 and output from the speaker 8.

The selection of the receiver is performed by the microcomputer 11 using the PL
This is performed by controlling L3 to obtain a desired reception frequency of the front end 2. When searching for a receiving station, the muting circuit 6 that prevents noise generation is activated. The received signal strength detection circuit 9 detects the broadcast from the broadcast station, the RDS demodulation circuit 10 determines the program content, determines the broadcast of the broadcast station to be received, cancels the muting of the muting circuit 6, and receives. To do.

The PLL 3 is controlled based on the preset frequency stored in the memory 12 of the microcomputer 11 to receive the broadcasting station (S1). When the received signal strength detection circuit 9 detects whether or not the signal strength is lowered (S2) and the signal which detects that the received signal strength is lower than a predetermined level is input to the microcomputer 11, the microcomputer 11 The PLL 3 is controlled and received based on the frequency of the next preset channel, and it is detected whether or not the received signal strength is lowered (S4). The above operation is confirmed for all the channels stored in the preset memory 12 (S5).

Further, if the number of preset channels with signal strength reduction in the current preset is two or more (S6), the microcomputer 11 selects two stations of the preset channels with signal strength reduction among the preset channels (S7). ).

If the number of channels with reduced signal strength is less than or equal to 1 (S6), two stations out of preset channels without reduced signal strength are selected (S8).
The microcomputer 11 controls the PLL 3 to start a search (PI search) (S9).

When the PI search is started, the reception frequency to be searched is set to the lower limit frequency (S21), the reception frequency is increased by one step (S22), and if there is no broadcast and no reception, the process returns to S22, The microcomputer 11 is PLL3
Is controlled to repeat the step-up (S23).

The microcomputer 11 detects whether or not there is a broadcasting station and is the same program broadcasting station according to the selected PI code.
The broadcasting frequency of the same program broadcasting station is received (S24), (S
9, 10). Whether the stations are broadcast stations of the same program (genre) is determined by determining whether the PI codes input from the RDS data demodulation circuit 10 to the microcomputer 11 are the same.
The signal strength of the frequency of the preset station stored in the memory 12 and the signal strength of the reception frequency of the same program broadcasting station after the search are compared, and the microcomputer 11 controls so as to receive the frequency of the better signal strength. (S25).

When the signal strength of the two selected stations is higher than the signal strength before the search, the frequency is stored in the memory 14 (S26), and the same PI code is stored until the selected frequency reaches the upper limit frequency. The reception frequency of the station is searched (S27).
By repeating the above operation, it is possible to receive the best signal frequency among broadcasting stations of the same program genre.

[0016] Up to two stations having a signal strength of the received frequency which is larger than that of the station previously stored at the reception frequency of the broadcast of the station having the same PI code are PI-searched and stored in the memory 14. Whether or not the reception frequency and the PI code of the first and second stations newly temporarily stored in the memory 14 are stored in the frequency list of each area of the memory 13 shown in FIG. Compare and check (S11, S1
2).

If the newly received frequency and PI code are stored in the frequency list of the predetermined area of the memory 13, the microcomputer 11 determines that the current moving area is the predetermined area.
The frequency and PI code are updated and stored in the preset memory 12 of the area list (S13). For example, if it matches the area shown in FIG.
Z, 87.7 MHz in the channel 2 ... 88.5 MHz in the channel 6 are stored in the preset memory 12.

If the newly received frequency and PI code are not in the frequency list of each area of the memory 13, the microcomputer 11 controls the PLL 3 to perform PI search (S2
2) The frequency of the same program broadcasting station as the program broadcasting station stored in the preset memory 12 is received (S24), and the signal strength of the frequency of the preset memory 12 previously stored and the broadcasting frequency of the same program broadcasting station are received. The signal strengths are compared, a frequency having a better signal strength is received (S25), and the frequency is stored in the preset memory 12 (S14). Further, the same contents are stored in the memory 13 as a new area.
(S15)

Since the operation of storing in the memory 13 of the microcomputer 11 is performed when the receiving area moves, the preset channel, frequency and PI code for each area are stored in the memory 1.
3 are separately stored, and a frequency list for each area can be set and stored. For example, if the user selects channel 1 for "NEWS" channel 2 for "ROCK" channel 3
"JAZZ" Channel 4 "CLASSICAL"
Channel 5 "OLDIES" Channel 6 "TA
When LK "is preset memory by switch operation, the frequencies and PI codes of the receiving stations of all 6 channels are stored in the memory 13. Therefore, in the frequency list of the receiving stations of each area, the channel and the program broadcasting genre are the same. A list of receiving stations having different frequencies depending on the region and the channel is shown in FIG.

As described above, according to the present invention, even if the receiving area is moved, it is necessary to rewrite the contents of the preset memory 12 to the contents of the preset corresponding to the area, and to perform the manual setting or the automatic setting each time the area is moved. Without
Since the frequencies of broadcasting stations of the same series of program content are stored in the memory 13 in the same preset channel in correspondence with each other,
If the same preset button is used to specify the reception of a program, it is possible to immediately receive a reception station of a desired genre in a good reception state in accordance with regional movement.

[0021]

[Effects of the Invention] According to regional movement, P
Since a station having a high reception intensity is automatically stored in the memory by the I code, excellent tuning reception can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram of an in-vehicle RDS receiver according to the present invention.

FIG. 2 is a flowchart showing a receiving operation of the in-vehicle RDS receiver according to the present invention.

FIG. 3 is a diagram for explaining a state stored in a memory.

[Explanation of symbols]

 1 Antenna 2 Front End 3 PLL 4 IF / DET 5 Volume 6 Muting Circuit 7 Amplifier 8 Speaker 9 Received Signal Strength Detection Circuit 10 RDS Demodulation Circuit 11 Microcomputer 12, 13, 14 Memory

Claims (2)

[Claims] 1. A receiver for receiving an RDS broadcast,
First storage means for storing a plurality of frequency information and received signal strength levels for receiving a broadcast; second storage means for storing the frequency information stored in the first storage means for each region; The same PI code as the third storage means for receiving a plurality of RDS broadcasting stations according to the frequency information stored in the first storage means and storing the PI code and frequency information of the received signal corresponding to the received frequencies When the received signal level stored in the first storage means is lower than the received signal strength level of the newly received broadcast, the third storage means is used. The combination of the PI code and the frequency information stored in the area is searched from the area list of the second storage means stored for each area, and the frequency information and the PI of the matched area are searched.
An in-vehicle RDS receiver comprising update means for rewriting the content of the code in the first storage means. 2. An RDS decoder for demodulating RDS data containing a PI code from an RDS broadcast signal, a received signal strength detection circuit for detecting a received signal strength of a received broadcast of an RDS broadcast station, and a plurality of RDS broadcast stations. First storage means for storing a plurality of frequency information for receiving the broadcast of the above, second storage means for storing the frequency information stored in the first storage means for each area, and the first storage Third storage means for receiving a plurality of RDS broadcasting stations according to the frequency information stored in the means, and respectively storing the level of the received signal strength and the PI code corresponding to each frequency; and the first storage means. Same PI as the RDS station stored in
R received by sequentially receiving the broadcast of the code broadcasting station and comparing with the received signal strength level stored in the first storage means.
When the frequency information corresponding to the received signal strength level lower than the received signal strength level of the broadcast of the DS broadcasting station is stored in the first storage means, the frequency information stored in the first storage means is used as the second information. Frequency information stored in the storage means of the first storage means and the frequency information stored in the first storage means is compared with the frequency list for each area of the third storage means and the second storage means to determine the area and frequency information of the area. An in-vehicle RDS receiver, characterized by comprising update means for rewriting to.