JP2569934Y2 - Radio receiver for RDS - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an RDS receiver.

[0002]

2. Description of the Related Art RDS (Radio
In the Data System) broadcast, a list of frequencies broadcasting the same contents is transmitted as an AF frequency list. In the RDS receiver for receiving the RDS broadcast, the frequency of the same broadcast content can be tracked by using the AF frequency list.
When the DS receiver is applied to a mobile receiver such as a car radio, the same broadcast can be continuously received without performing a tuning operation according to the movement.

[0003]

However, in a mobile receiver such as a car radio, when a preset channel is called, a specific frequency of the preset channel memory may not be received depending on the current position. In such a case, the conventional RDS receiver has a disadvantage in that it is necessary to perform a tuning operation to search for a frequency that is broadcasting the same contents as the called preset channel. An object of the present invention is to provide an RDS receiver in which the above-mentioned drawbacks of the related art are improved and the reception failure at the time of calling a preset channel is prevented.

[0004]

According to the present invention, there is provided an RDS receiver having a plurality of preset channel memories storing a specific frequency for calling a specific broadcast station. A storage unit for storing an AF frequency corresponding to a predetermined frequency stored in each preset channel memory; and, when a certain preset channel memory is selected, an AF frequency corresponding to a specific frequency of the preset channel memory is stored in the storage unit. To
Means for confirming whether the information is stored, and means for confirming the above
AF frequency corresponding to a specific frequency is stored
When it is confirmed that the stored AF frequency is
By calling in order and measuring the electric field strength of each
And a means for selecting and receiving a frequency having the highest electric field strength from among AF frequencies corresponding to a specific frequency .

[0005]

When a certain preset channel memory is selected, a specific frequency of the preset channel memory is selected.
Check whether the AF frequency corresponding to is stored,
When it is confirmed that the AF frequency is stored, the AF frequency is sequentially increased.
Next call to measure the electric field strength. And the AF frequency
And selects the frequency having the strongest electric field strength for reception.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a radio wave received by an antenna 1 is demodulated by a stereo demodulation unit 4 via a front end unit 2 and an intermediate frequency amplification / detection unit 3, and a low frequency amplification is performed via a tone control unit 5 and a volume controller 6. The signal is amplified by the unit 7 and converted into sound by the speaker 8. The RDS data is extracted from the intermediate frequency amplifying / detecting unit 3 through the RDS band-pass filter 9 and is output from the RDS data demodulating unit 10.
The data is demodulated and sent to the microcomputer 12 via the RDS data synchronization / error correction unit 11 as RDS data, where it is processed and stored. Microcomputer 12
Is connected to an operation unit 17 provided with operation buttons corresponding to the preset channels, and the operation unit 17 performs a preset call. The microcomputer 12 is provided with a memory 16,
The frequency of the preset channel stored here is called up, the PLL unit 15 is controlled based on the frequency information, and the broadcast of a predetermined frequency is received by controlling the front end unit 2 via the low-pass filter 14 for PLL. It is configured to be. 13 is a display unit. The memory 16 is configured to further store an AF frequency list corresponding to each frequency. FIG. 2 shows an example of the configuration of the memory 16, in which specific frequencies from 88.1, 88.2 to 89.0 Hz are stored in channels 1 to 10. Each channel stores AF frequencies 1 to N which are broadcasting the same program as the specific frequency. This AF frequency list is stored in the microcomputer 12 when the RDS broadcast is received.
Are automatically stored in the memory 16. An S-meter is input to the microcomputer 12 from the intermediate frequency amplification / detection unit 3 via the A / D converter 18 so that the electric field strength of the frequency being received can be determined. When the preset button of the operation unit 17 is operated, the microcomputer 12 controls the PLL unit 15 to receive the specific frequency of the memory 16 and each frequency of the AF frequency list corresponding thereto, and receives the S meter. Input and execute the reception of the frequency with the highest electric field strength. As a result, a state in which reception is impossible can be suppressed. If the AF frequency list has not been created in the memory 16,
The microcomputer 12 executes only reception of a specific frequency.

The operation will be described with reference to FIG. When a preset memory channel is called (step 30), the microcomputer 12 determines whether or not the AF frequency is stored in the memory 16 (step 31). Execute reception. If it is stored, the frequencies in the AF frequency list are sequentially called from the memory 16 and the reception of the frequency is executed (step 32). Then, the electric field strength of each frequency is input (step 33), and after measuring the electric field strengths of all AF frequencies (step 34), the frequency having the highest electric field strength is selected (step 3).
5). Then, reception of the frequency is executed, and at the same time, the frequency is displayed on the display unit 13 (step 36). As described above, even when a specific frequency of the preset memory channel cannot be received, other frequencies broadcasting the same program can be received, so that it is not necessary to perform tuning by manual operation.

[0008]

When the RDS radio receiver of the present invention as has been described above invention] is to store the frequency of the AF frequency list corresponding to the addition of a specific frequency preset channel memory, there preset channel memory is selected,
Check if the corresponding AF frequency is stored, and
When it is confirmed that the AF frequency is stored, the frequency having the highest electric field strength among the AF frequencies is received, so that it is possible to minimize problems such as reception failure when selecting a preset channel.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating an example of a configuration of a memory 16;

FIG. 3 is a flowchart illustrating operation.

[Explanation of symbols]

1: antenna, 2: front end section, 3: intermediate frequency amplification / detection section, 4: stereo demodulation section, 5: tone control section, 6: volume adjuster, 7: low frequency amplification section, 8: speaker, 9: Bandpass filter for RDS, 10: RDS
Data demodulation unit, 11: RDS data synchronization / error correction unit, 12: microcomputer, 13: display unit, 1
4: Low-pass filter for PLL, 15: PLL section, 1
6: memory, 17: operation unit, 18: A / D converter.

Claims (1)

(57) [Scope of request for utility model registration] 1. An RDS receiver having a plurality of preset channel memories storing a specific frequency for calling a specific broadcast station, wherein an AF frequency corresponding to a predetermined frequency stored in each preset channel memory is provided. Storage means for storing a preset channel memory when a certain preset channel memory is selected.
Corresponding to a specific frequency of the preset channel memory
Check if the AF frequency is stored in the storage means.
Means and an AF circuit corresponding to a specific frequency by the checking means.
When it is confirmed that the wave number is stored, the stored
The called AF frequencies are sequentially called, and the electric field strength of each is
AF frequency corresponding to specific frequency by measuring
Means for selecting and receiving a frequency having the strongest electric field strength from among the above, wherein the receiver for RDS is provided.