JPH11154883A - Rsd radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an RDS radio receiver which can reduce an originally unrequired operation or manipulation such as AF operation, the change of a reception station or the re-execution of preset after a preset frequency has been called. SOLUTION: An interference detecting circuit 13 is added, the field strength of a calling frequency is measured during mute operation by a controller 10, and when that strength is lower than a standard value, interference detection is performed. Then, an electric field is received in the order of frequency storage in an alternative frequency(AF) list, and when the field strength is at a satisfactory level, that level is stored in the memory of the controller. However, when the field strength is not at the satisfactory level, an interference level is stored, used for the learning operation of field strength following this storage and utilized for discriminating the presence or absence of the next station in the AF list.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RDS (Radio Data
System), especially AF (Alte
The present invention relates to an automatic switching operation of the same frequency broadcasting station using a (rnativ Frequency) code.

[0002]

2. Description of the Related Art RDS practically used in Europe
(Radio data system) is a system that multiplexes various data on FM broadcasts, and includes broadcast identification codes (hereinafter referred to as PI codes), alternative frequency lists of the same network (hereinafter referred to as AF lists), and broadcast station names as various data. Codes (hereinafter referred to as PS codes).

FIG. 4 is a block diagram showing a configuration of a conventional RDS radio receiver. In FIG. 4, 1 is an antenna for receiving FM multiplex broadcasting, 2 is a front end for selecting a desired broadcasting station and converting it to an intermediate frequency (IF), and 3 is an I / O.
The IF amplifier 4 for amplifying the F signal is a PLL synthesizer, and a desired broadcasting station can be selected by changing the ratio data set in the program divider in the PLL synthesizer 4. 5 is an FM detection circuit (D
ET), and the output of the FM detection circuit 5 is supplied to the MPX demodulation circuit 6 and separated into left and right (L, R) stereo signals. Reference numeral 7 denotes a filter (57 kHz) for extracting a radio data signal from the detection output of the FM detection circuit 5. The output of the filter 7 is demodulated by the RDS data demodulation circuit 8, and radio data coded by the decoder 9 is generated. . 1
Reference numeral 0 denotes a controller composed of a microcomputer or the like. Radio data generated by the decoder 9 is stored in a memory in the controller 10, and is used for various controls such as display control of a broadcast station name on the display unit 12. The output of the IF amplifier 3 is input to the controller 10, and the received signal level is determined. 11 is a plurality of preset buttons 11B
When a predetermined preset button is operated, based on the reception frequency-related data stored in the memory in the controller 10 corresponding to the preset button,
PLL synthesizer 4 to tune to a predetermined frequency
The frequency division ratio data is set in the variable division period.

FIG. 5 shows various data stored in a memory in the controller 10 shown in FIG. In the memory, the reception frequency f00 of the currently receiving broadcasting station, the PI code PI0 of the currently receiving broadcasting station, the currently receiving AF lists f01, f02, f03, f04,. PS code PS0, P of other network
I code and AF list (PI1, f10, f11, f1
2, f13, f14, ...), (PI2, f20, f2
, F22, f23, f24,...) And auto preset data (PI code,
Reception level, AF list) and the like. Also,
The interference level data (MC0
1, MC02, MC03, MC04) are also stored.

[0005]

However, in the RDS radio receiver having the above-mentioned configuration, the conventional preset call operation is performed by mute ON (S1) and call by operating a preset button or the like as shown in the flowchart of FIG. It is simply called by the procedure of frequency tuning (S2) and mute OFF (S3). That is, the stored frequency was not rewritten unless an operation such as resetting again was performed. For this reason, a preset broadcast station becomes unreceivable when traveling a long distance in a car or the like, and there is a problem that an operation or operation that is not originally required, such as an AF operation, a change in the receiving station, and a reset of the preset, is required. Was.

When the preset frequency is called, mute is applied to reduce noise at the time of frequency switching.

The present invention has been made in view of the above-mentioned conventional problems, and has
In the radio receiver used for S, A
The F list can be preset according to the preset button, and the preset operation (when changing the frequency, mode switching, FM
In addition to searching for and receiving the broadcast station with the best reception status (including band switching), use the mute time at that time to investigate the reception status of other AF lists and update the AF list in the order of good reception status It is another object of the present invention to provide an RDS radio receiver capable of reducing unnecessary operations and operations such as an AF operation after calling a preset frequency, a change of a receiving station, and a resetting of a preset.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a receiving apparatus for receiving a program and a frequency code group of a broadcasting station which transmits the same program together with a program. Means for muting when switching to a frequency stored in advance, and checking the reception status of each frequency of the frequency group of the same program broadcasting station already stored during the muting, and And a means for receiving a broadcast station in an optimal reception state when the program is selected next time.

According to the present invention, the electric field strength at each frequency in the AF list is collectively investigated by using the mute time, and the electric field strength is updated in ascending order of the reception state. If the electric field strength of the called frequency is below a certain level, the electric field strength at the time of presetting or the electric field strength received last time is different.
(Reception at another location), and automatically starts checking and updating the frequency of the AF list. Further, when the electric field strength of the called frequency is higher than a certain value, the previous data is used as it is.

In this way, the AF operation after calling the preset station, that is, the automatic switching to the alternative frequency can be smoothly performed based on the update result, and the AF operation during reception can be performed.
The frequency of checking (detection of electric field strength level, interference (multipath, adjacent channel, etc.) level, PI code, REG (affiliated local station) code) can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an RDS according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a radio receiver. In FIG. 1, reference numeral 13 denotes an interference detection circuit,
It is connected between the LL synthesizer 4 and the controller 10. Other configurations between the respective blocks and their functions are the same as those in FIG.

Next, the operation of FIG. 1 will be described with reference to the flowchart shown in FIG. 2 from the mute ON (b) of the present invention to the start of the update operation. First, when the controller 10 enters the mute operation, the controller 10 shifts to a ringing frequency tuning operation (c), then measures (d) the electric field strength (SD) at that frequency and performs an update operation (I) ( (Fig. 3)
If the value is smaller, the process proceeds to disturbance detection (e) by the disturbance detection circuit 13, and the following determination is made.

Whether the IF is 10.7 kHz, for example. RDS lock? Can PI code be decoded? Does the PI code match the memory data? Only when all of the above determinations are satisfied, the flow proceeds to the update operation (FIG. 3) as OK, and when not satisfied, the electric field strength (S
D) is measured (f), and if it is larger than SD2, it is tuned to the maximum electric field station in the AF list (g), and if smaller, the mute is turned off (h).

Next, a flow chart of the updating operation from FIG. 2 to FIG. 3 will be described. Received in the order of storing the frequencies in the AF list (i), measured the electric field strength (j), and if the electric field strength (SD) was at a level D3 that satisfies (k), the SD level was stored.
(l) If you are not satisfied, remember the interference level
(n), starts to determine the presence or absence of the next station in the AF list
(m) If there is no next station, sort the list by SD
(o), extracting a station having a value equal to or higher than the SD reference value (in a state where there is an electric field strength enough to be an object of AF) (p), receiving an IF list station (q), and receiving an IF of 10.7 MHz (r) , RDS lock (s), PI decode (t), and PI comparison (u), and if even one of the above is not satisfied, the interference level is stored (w) to perform the next operation in the AF list. The flow proceeds to the station presence / absence check (v). Then, it is checked whether the same program broadcasting station exists in the list (x), and if there is the same program station, the maximum SD station in the list is received (y). If there is no same station, the calling station is received. (Z).

[0016]

As described above, according to the present invention, there is provided means for muting when switching to a frequency stored in advance, and reception of each frequency of a frequency group of the same program broadcasting station already stored during the muting. Means for examining the situation, updating the frequency group in ascending order of reception conditions, and receiving a broadcast station in an optimal reception state the next time the program is selected, so that the AF operation after calling the preset station can be performed. Can be smoothly performed based on the update result, and the frequency of the AF check (detection of the electric field strength level, the interference level, the PI code, and the REG code) during reception can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an RDS radio receiver according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an update operation according to the embodiment of the present invention;

FIG. 3 is a flowchart of an update operation according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional RDS radio receiver.

FIG. 5 shows A of RDS in a conventional RDS radio receiver.
Memory example of F-list and auto preset memory

FIG. 6 is a flowchart of a paging frequency tuning operation in a conventional RDS radio receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Front end 3 IF amplifier 4 PLL synthesizer 5 FM detection circuit (DET) 6 MPX demodulation circuit 7 Filter 8 RDS data demodulation circuit 9 Decoder 10 Controller 11 Tuning section 11B Preset button 12 Display section 13 Interference detection circuit

Claims (3)

[Claims] 1. A receiver for receiving a program and a frequency code group of a broadcasting station that transmits a frequency code group of a broadcasting station that broadcasts the same program together with a program, wherein a mute is applied when switching to a frequency stored in advance. Means and the reception status of each frequency of the frequency group of the same program broadcasting station already stored during the mute is investigated, and the frequency groups are updated in the order of good reception conditions, and are optimal when the program is selected next time. Means for receiving a broadcast station in a proper reception state. 2. The RDS radio according to claim 1, wherein during the mute operation, the electric field strength of the calling frequency is measured, and when it is larger than the reference value, the operation shifts to the update operation, and when it is smaller, the interference detection is performed. Receiving machine. 3. During the mute operation, if the level is received in the order of storing the frequencies in the AF list and the electric field strength satisfies the level, the level is stored. If the level is not satisfied, the interference level is stored, and the next station in the AF list is stored. 3. The RDS radio receiver according to claim 1, wherein the presence / absence determination is performed.