KR20000038177A - How to automatically select the reception area of RDS receiver - Google Patents

Abstract

The present invention relates to an RDS receiver, and more particularly, to a method for automatically selecting a reception area of an RDS receiver, which automatically switches to a surrounding local broadcast when it is out of the reception area (REGIONAL) during RDS reception. .

To this end, the present invention receives and demodulates an FM signal and an RDS signal transmitted from a broadcasting station, and detects switching information to a local broadcasting station and replacement frequency information for a reception frequency of a corresponding broadcasting station among the demodulated signals. In a method of automatically selecting a reception area of an RDS receiver performing switching of a reception station by an alternative frequency when a signal state is poor, (a) when it is determined that a reception state of a received broadcast signal is poor, it is replaced with a corresponding broadcast channel. Determining whether a receivable channel exists by checking a frequency; (b) if there is no receivable channel as a result of the determination of step (a), searching for switching information from RDS data to a local broadcasting station Judging whether there is a; (c) And if there is a local broadcasting station channel that can be received as a result of the determination, setting the reception frequency to a frequency capable of receiving the local broadcasting channel.

Description

How to automatically select the reception area of RDS receiver

The present invention relates to an RDS receiver, and more particularly, to a method for automatically selecting a reception area of an RDS receiver, which automatically switches to a surrounding local broadcast when it is out of the reception area (REGIONAL) during RDS reception. .

As is well known, Radio Data System (hereinafter abbreviated as RDS) adds digital data to existing FM stereo broadcasting signals to provide 16 service functions such as broadcasting station identification and automatic tuning. The new digital multicasting system.

The RDS receiver receives and demodulates an FM signal transmitted from a broadcasting station by including an RDS signal in a subcarrier (for example, 57 KHz), detects an RDS signal from the demodulated signal, and demodulates data and a clock. The data necessary for RDS application will be collected, sorted and utilized.

The digital data multiplexed RDS has five basic functions: program recognition (PI), program type (PTY), alternative frequency (AF), traffic information broadcasting (TA), and traffic program (TP). Demodulate with a stereo receiver.

In addition, the Alternate Frequency (AF) system provided by RDS means batch data for a list of other frequencies broadcasting the same program in an RDS station, which is a format for realizing automatic tuning, that is, 1 It consists of up to 25 sequences of two frequencies of 8 bits * 2 = 16 bits in the block, and compares the frequency currently being tuned by the receiver with the level of the replacement frequency received on the AF list. The system allows the level of the field strength to be automatically switched to a frequency on a large alternative frequency so that the listener can always hear a clean broadcast.

The method of switching alternative frequencies in the conventional RDS receiver is the same as the flowchart shown in FIG. 1. That is, in the case of receiving the RDS broadcast transmitted from the broadcasting station in step S10, the strength of the signal received in step S12 is detected to determine whether the reception sensitivity is reduced. If the reception sensitivity is lowered in step S14, the alternative frequency of the alternative frequency list of the receiving broadcast station is checked, and in step S16, the reception frequency is sequentially switched to the alternative frequency of the corresponding alternative frequency list to receive another broadcast channel. Determine if it exists.

At this time, if there is no broadcast channel that can be received in the alternative frequency list, as in the case where the reception area for the broadcast channel is out of step, step S12 or less is repeated. On the other hand, if there is a broadcast channel that can be received, the corresponding frequency is received by setting an alternative frequency of the broadcast channel that can be received in step S18 as a reception frequency.

However, when there is no switchable broadcast channel, there is a problem in that the driver must select a broadcast station to receive to change the reception frequency through a separate key operation. In addition, since the driver repeatedly performs alternate frequency checks until a key operation for switching channel channels is performed, the driver maintains a mute state for a long time while searching for a switchable station, which causes the driver to be recognized as noise. .

Accordingly, the present invention has been made to solve the above-described problems, and its object is to provide a broadcasting station capable of substituting a reception frequency when the reception frequency of the reception frequency is reduced. If it does not exist, it is intended to provide a method for automatically selecting a reception area of an RDS receiver that searches for alternative frequency information of neighboring local broadcasting stations included in the extension network (EON) data and automatically switches the reception frequency to the local broadcasting station. .

1 is a flowchart illustrating a method for automatically selecting a reception area of a conventional RDS receiver.

2 is a system configuration diagram showing a schematic configuration of an RDS receiver for implementing the present invention.

3 is a flowchart illustrating a method for automatically selecting a reception area of an RDS receiver according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ... FM tuner 20 ... FM intermediate frequency processing unit

30 ... Radio circuit section 40 ... RDS signal detection section

50 Synchronization and error correction unit 60 Key input unit

70 Display 100 Microcom

In order to achieve the above object, a method for automatically selecting a reception area of an RDS receiver according to the present invention receives and demodulates an FM signal and an RDS signal transmitted from a broadcasting station, and converts information from the demodulated signal to a local broadcasting station. In the method of automatically selecting a reception area of an RDS receiver that detects alternative frequency information on a reception frequency of a corresponding broadcast station and switches a reception station by an alternative frequency when a signal state of the reception frequency is poor, If it is determined that the reception state of the receiver is in a poor state by checking the alternative frequency for the corresponding broadcast channel to determine whether there is a receivable channel, (b) If the determination result of the step (a) is determined that there is no receiving channel Search for switching information from DS data to local stations Determining whether there is a local broadcast station that can be switched; (c) if there is a local broadcast station channel that can be received as a result of the determination of step (b), setting a reception frequency to a frequency capable of receiving the local broadcast channel; Characterized in that provided.

Hereinafter, a configuration and an operation effect of a method for automatically selecting a reception area of an RDS receiver according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a system diagram showing a schematic configuration of an RDS receiver for implementing the present invention. As shown in FIG. 2, an RDS receiver for implementing the present invention includes an FM tuner 10 for selecting an FM broadcast signal of a desired frequency band from FM broadcast signals of respective frequency bands (channels) input from an antenna, and the FM. The synchronization signal is detected from the output signal of the RDS signal detector 40 and the RDS signal detector 40 which detects the RDS signal of the channel tuned by the tuner 10, and the error is detected and detected. The output field strengths of the synchronization and error correction unit 50, the FM intermediate frequency processing unit 20 which extracts the intermediate frequency from the high frequency output to the FM tuner 10, and the FM intermediate frequency processing unit 20 are corrected. When the scanning (SD) signal below a certain level lasts for a predetermined time or more, the system controls the system to change the currently received broadcast frequency to an alternate frequency (AF) and to control the user's key input. A microcomputer 100 for performing a program type search by a can, a key input unit 60 for receiving a key signal for controlling the operation of the microcomputer 100, and a display unit 70 for displaying an operation state of an RDS receiver. And a general radio circuit unit 30.

3 is a flowchart illustrating a method for automatically selecting a reception area of an RDS receiver according to the present invention. As shown in FIG. 3, in the method for automatically selecting a reception area of an RDS receiver according to the present invention, if it is determined that the RDS broadcast is currently being received in step S30, the FM tuner unit 10 in step S32. It is determined whether the reception state of the FM broadcast signal received through the) is good. That is, if the SD signal of the FM broadcast signal is detected and the SD signal level is lower than the predetermined reference level, it is determined that the reception state is poor. If the SD signal level is higher than the reference level, the reception state is determined to be good.

Therefore, if the reception state is good, the process proceeds to step S40 and tunes the FM tuner unit 10 to the reception frequency of the received FM broadcast channel to receive the corresponding broadcast channel, and if the reception state is poor, step S34. Subsequently, the alternate frequency, which is the frequency data of each broadcasting station broadcasting the same program, is sequentially set to the reception frequency of the FM tuner 10 to obtain the corresponding SD signal, and the alternative frequency having the highest magnitude of the SD signal is obtained. The corresponding alternative frequency is set to the reception frequency of the FM tuner 10 to determine whether there is a switchable broadcast channel.

At this time, when there is a switchable broadcast channel as a result of the determination in step S36, if the SD signal level of the frequency signal received at the alternative frequency set in the FM tuner 10 is higher than the predetermined setting level, the flow proceeds to step S38. The selected channel of the FM tuner 10 is switched to the corresponding alternative frequency.

On the other hand, as a result of the determination in step S36, the reception frequency of the FM tuner 10 is sequentially set and searched at the alternative frequency set in the alternative frequency list for each broadcasting station that receives the same program broadcast, and thus, the reception of an alternative frequency channel is possible. If this does not exist, the flow advances to step S42 to automatically count the waiting time (AUTO REG CNT) for performing a search for an alternative frequency of the local broadcasting station.

When the waiting time has elapsed in step S42, the flow advances to step S44 to detect enhanced network data included in the RDS data and transmitted, and to obtain regional broadcasting station information from the expanded network data EON. The frequency data of each local broadcasting station is retrieved. If there is a local broadcasting station capable of receiving a broadcast channel as a result of the search, in step S50, a frequency for receiving the corresponding program information transmitted from the local broadcasting station to the reception frequency of the FM tuner 10 (this is set from the extended network data). Switch to

However, if there is no switchable local broadcasting station as a result of the determination of step S46 and checking the local broadcasting station frequency of the extended network data EON, in step S48, the automatic search for the receivable broadcasting channel is performed. Do this.

A method for automatically selecting a reception area of an RDS receiver according to the present invention is not limited to the above-described embodiment, and may be modified in various ways within the scope of the technical idea of the present invention.

As described above, in the method for automatically selecting a reception area of an RDS receiver according to the present invention, when a reception sensitivity of a reception frequency received from a corresponding broadcasting station decreases, a broadcasting station capable of searching for an alternative frequency and substituting the reception frequency may be selected. If it does not exist, it searches for alternative frequency information of the local (REG) station included in the extended network (EON) data and automatically switches the reception frequency to the local station.

Therefore, by the method for automatically selecting a reception area of an RDS receiver according to the present invention, the user can automatically switch to an alternative frequency of a local broadcasting station even when a user does not perform a separate key operation. Frequency search can be provided.

Claims (1)

Receives and demodulates an FM signal and an RS signal transmitted from a broadcasting station, and detects switching information to a local broadcasting station and replacement frequency information for a reception frequency of the corresponding broadcasting station from among the demodulated signals, so that the signal state of the receiving frequency is poor. A method for automatically selecting a reception area of an RDS receiver performing switching of a reception station by an alternative frequency, (A) detecting a reception state of a received broadcast signal and determining that there is a receivable channel by checking an alternative frequency for the corresponding broadcast channel if it is determined that the reception state is poor; (B) if there is no channel to be received as a result of the determination in step (a), determining whether there is a switchable local broadcasting station by searching for switching information from the extended network data (EON) of the RDS data to the local broadcasting station; (C) if there is a local broadcast station channel receivable as a result of the step (b), setting the reception frequency to a frequency capable of receiving the corresponding local broadcast channel and automatically switching the reception area. A method for automatically selecting a reception area of an RDS receiver.