KR100291104B1 - Program Type Search Control Method of RDS Receiver - Google Patents

Abstract

The present invention relates to a method for controlling a program type search of an RDS receiver, and more particularly, to a program of an RDS receiver that can quickly search for a program type by using received RDS data. Type search control method.

To this end, the present invention performs demodulation by receiving FM signals and RDS signals transmitted from broadcasting stations, and detecting program TYpe information contained in the RDS signals among the demodulated signals to perform program type search. In the method of controlling a program type search of a receiver, (a) if a program type for program type search is selected by a user's key input signal, the enhanced network group (EON) data is searched for whether a user-selected program type channel exists. (B) performing a program type search for a channel stored in a preset memory when there is no selected program time in the search result enhancement network group data; (c) the steps (a) and steps (B) Improvement of judgment result Network group (EON) data and preset If the selected program type data in memory does not exist, it is achieved by having the step of performing a program type search by the sequential frequency tuning for the entire reception band.

Description

Program type search control method of RDS receiver

The present invention relates to a method for controlling a program type search of an RDS receiver, and more particularly, to a program of an RDS receiver that can quickly search for a program type by using received RDS data. Type search control method.

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.

In this case, the program type function is detected by detecting program type information included in the RDS data. In other words, by detecting information (program type (PTY) information) on the program being broadcast, which is included in the RDS data, the user selects and receives only a desired program. (NEWS) ″ To search only the program type information, select a channel that is broadcasting the current news to listen to the news, and when the news ends on the channel and starts a new broadcast, searches for another channel. You will select the channel on which the news is being broadcast. Similarly, when a user wants to listen to a different kind of broadcast program, the user can select from among a large number of program types (e.g., 16 to 32 programs such as ″ news ″, ″ sports ″, ″ classic ″, ″ song ″, etc. Simply select the program type you want.

In addition, when a user designates a desired program type, a program type search function for automatically searching for a broadcast channel of a corresponding program type in a frequency band receivable from RDS data is provided.

FIG. 1 is a flowchart illustrating a conventional program type search method. When a program type is selected from a user as shown in FIG. 1 (step S10), frequency tuning is performed by adjusting a search frequency to 87.5 MHz. (Step S12 and Step S14). At this time, if the magnitude and the intermediate frequency of the received frequency signal are checked (steps S16 and S18) and the signal size is greater than a predetermined value and the intermediate frequencies match, the received RDS data is read (step S20). In this case, when the program type information included in the read RDS data coincides with the program type of user selection, the corresponding broadcast channel signal is received (steps S22 and S24). The frequency is sequentially increased to search for a user-selected program type in all frequency bands (steps S26 and S28).

In the conventional program type search method of an RDS receiver, a program type in the entire frequency band is searched to search for a program type selected by a user.

Therefore, when the RDS data is out of the receiving area, the program type search for the entire frequency band results in no receivable frequency signal above a certain electric field strength, and thus repeats the program type search operation. There is a problem that takes a long time to perform a program search. In addition, since the search time is long, the MUTE operation, which is an essential matter of the process, is performed during the search time, so that a broadcast channel cannot be listened to.

Accordingly, the present invention has been made to solve such a conventional problem, and its object is to provide a program type search method by preferentially searching for other broadcasting station information and program type information stored in a preset memory in a program type search method of an RDS receiver. It is an object of the present invention to provide a program type search control method of an RDS receiver capable of performing a search quickly.

1 is a flowchart illustrating a program type search control method of a conventional RDS receiver.

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

3 is a flowchart illustrating a program type search control method of an RDS receiver according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ... FM tuner section 20 ... FM middle frequency section

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 program type search control method 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 among the demodulated signals, a program type carried in an RDS signal. In the program type search control method of an RDS receiver that detects (Program TYpe) information to perform a program type search,

(A) If a program type for the program type search is selected by the user's key input signal, searching the EON group data to search whether there is a program type channel selected by the user, and (B) the search. Result Enhancement If there is no selected program time in the EON group data, performing the program type search for the channel stored in the preset memory, (C) Determination results of steps (a) and (b) above. And if the selected program type does not exist in the enhanced network group data and the preset memory data, performing a program type search by sequential frequency tuning for the entire reception frequency band.

The step (a) of the method for controlling a program type search of an RDS receiver of the present invention includes (a) if a desired program type is found as a result of searching for enhanced network group data, the number of alternative frequencies set from the alternative frequency list of the corresponding broadcasting station data. Detecting and storing, (a) loading the first alternative frequency set in the detected alternative frequency list, and setting a reception frequency at the corresponding alternative frequency, (a) setting in step (a) Detecting a signal received from an alternative frequency and determining whether it is receivable, and if it is receivable, searching for a program type from the received RDS data to determine whether it is a user-selected program type; If the user-selected program type does not exist in the received RDS signal, the current search is performed. By changing the alternative frequency to the next alternative frequency in the list comprises the step of repeating the steps carried out to (3) below.

In the method of controlling a program type search of an RDS receiver of the present invention, the step (b) may include (b) if a desired program type exists as a result of a search for the RDS data stored in the preset memory, stored in the preset memory. Detecting the number of alternative frequencies from the list of alternative frequencies, setting the first alternative frequency set on the list as a reception frequency, (b2) determining a signal received from the reception frequency set in step (b) and Determining whether a program type exists, and if the corresponding program type exists, receiving the corresponding broadcast channel; (b) a signal received from an alternative frequency changed as a result of the determination of the step (b); If not broadcasting, set the next alternative frequency on the alternative frequency list as the reception frequency and Step (B 2) is made by a step of repeatedly performing the following.

Hereinafter, the configuration and operation effects of a program type search control method of an RDS receiver according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block 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 respective frequency bands (channels) input from an antenna. An FM tuner 10 for selecting an FM broadcast signal of a desired frequency band from the FM broadcast signal of the < RTI ID = 0.0 >, < / RTI > an RDS signal detector 40 for detecting an RDS signal of a channel tuned by the FM tuner 10, and A synchronization signal is detected from the output signal of the DS signal detection unit 40, an error is detected from the synchronization and error correction unit 50 for detecting and correcting the error, and an intermediate frequency is extracted from the high frequency output to the FM tuner 10. The broadcast frequency currently received when the output signal strength of the FM intermediate frequency processing section 20 and the FM intermediate frequency processing section 20 lasts for a predetermined time or less. Inputs a key signal for controlling the operation of the microcomputer 100 to control the system to change the Alternate Frequency (AF) and to perform a program type search by scanning a user's key input. A receiving key input unit 60, a display unit 70 for displaying the operation state of the RDS receiver and a general radio circuit unit 30 is composed of.

In the above-described configuration, RDS multiplexed with digital data has five basic functions: program recognition (PI), program type (PTY), alternative frequency (AF), traffic information broadcasting (TA), and traffic program (TP) functions. Is demodulated by an existing electronic tuner car stereo receiver.

In this case, the AF system refers to batch data for a list of different frequencies broadcasting the same program in an RDS broadcasting station, which is a format for realizing automatic tuning, that is, two frequencies in one block are 8 bits * 2 = 16. It consists of up to 25 bits as a sequence of bits, and compares the frequency currently being tuned by the receiver with the level of the replacement frequency received on the AF list, and automatically switches to the frequency of the AF in which the current reception frequency has a large level of electric field strength. It is a system that allows a listener to always listen to a clean broadcast.

3A and 3B illustrate a flowchart for describing a program type search control method of an RDS receiver according to the present invention. As shown in FIG. 3A, in the program type search control method of an RDS receiver according to the present invention, first, desired program type information is selected from a user in step S40. In step S42, EON (Enhanced Other Network) group data is detected from the demodulated ADS data by the ADS signal detecting unit 40 to search whether a program type of a user selection exists in a broadcasting station channel of an adjacent region. Done. At this time, if there is a broadcast channel of the program type selected by the user in the search result step S44, the flag EON DATA SEARCH indicating the program type search in the enhanced network group is set to 1 in step S64. In the next step S66, the number of alternative frequencies stored in the alternative frequency list for receiving the corresponding station frequency in the enhanced network group in which the user-selected program type channel exists is stored in the memory.

In the next step S46, if the broadcast of the selected program type does not exist as a result of retrieving the enhanced network group data, each data stored in the preset memories M1 to M6 is checked for user selection among the broadcast channels stored in the preset memory. It will determine if there is a channel that matches the program. At this time, the Als data stored in the preset memories M1 to M6 stores the frequency of the corresponding broadcasting station, program recognition (PI) information, program type (PTY) information, and replacement frequency (AF) information. Therefore, in step S46, it is determined from the data of each channel memorized in each preset button whether there is a broadcast channel that matches the broadcast of the program type selected by the user.

As a result of the determination in step S48, if there is a broadcast channel of the same program type as the user-selected program type among the broadcast channels stored in the preset memory, the flow advances to step S50 to indicate a preset search flag indicating a preset memory search. Set to 1. In step S52, the number of alternative frequencies is detected and stored from the alternative frequency list stored in the preset memory.

Subsequently, in step S54, it is first determined whether the enhanced network group search flag EON DATA SEARCH is set in order to search the program type, and the result of the determination is that the enhanced network group search flag EON DATA SEARCH is set, that is, the enhanced network. If it is determined that the program type selected by the user exists in another broadcasting station channel in the group, the process proceeds to step S62 and the first alternative frequency of the alternative broadcasting station frequency list is loaded to perform the following step S70 or below. It is determined whether a broadcast frequency signal exists.

On the other hand, if the program type selected by the user does not exist in the broadcasting channel transmitted from another broadcasting station as a result of the determination in step S54 (if EON DATA SEARCH is 0), the process proceeds to step S56 and stored in the preset memory. It is determined whether a desired program type exists in a broadcast channel. As a result of the determination, when there is a broadcast of a desired program type in a broadcast channel stored in the preset memory, it is determined in step S58 whether a broadcast of a desired program type exists in another broadcast station channel. If the determination result does not exist, the process proceeds to step S60 and the first alternative frequency stored in the corresponding preset memory is loaded.

If it is determined in step S48 that the channel of the desired program type does not exist in another broadcasting station channel and the channel stored in the preset memory, the process proceeds to step S68 where all frequency bands capable of receiving a frequency (for example, 87.5 Adjust the initial frequency (MHz ~ 108.0MHz) to 87.5MHz. Thereafter, in step S70, the FM tuner 10 is tuned to receive the signal transmitted at the adjusted frequency in step S68, and in step S72, the intermediate frequency of the received frequency signal and the strength of the signal Check whether it is a broadcast signal that can be received. At this time, if it is determined that the signal can be received in step S74, in step S76 the RDS signal detection unit 40 detects the RDS data tuned to the frequency signal received from the FM tuner unit 10, and the step ( In S78), the program type information included in the detected RDS data is compared with the program type desired by the user.

At this time, if the program type information detected from the RDS data coincides with the program type of the user selection, the corresponding broadcast channel is received in step S80 and the program type search is terminated. On the other hand, if the program types do not match, the process proceeds to step S90 to set the next frequency for the program type search, and in step S82 it is determined whether the search of the search frequency set in the step S90 is completed. If it is not completed, step S70 or below is repeated, and if it is completed, the program type search routine ends.

On the other hand, the search frequency confirmation and setting in the above-described step (S90) is the same as the flowchart shown in Fig. 3b. That is, as shown in FIG. 3B, when it is determined in step S92 that there is a broadcast of a program type selected in other broadcasting station data, the flow advances to step S110 to replace the data stored in the enhanced network group data EON DATA. The next alternative frequency of the current frequency is determined from the frequency list and set as the new search frequency.

In step S112, it is determined whether or not the search for the entire alternative frequency stored in the enhanced network group data (EON DATA) is completed. If the search for the entire alternative frequency is not completed, the step S70 or less is performed to perform the replacement. Perform a program type search on a signal received at a frequency.

On the contrary, when the program type search for all alternative frequencies included in the other broadcasting station data in the enhanced network group is completed in step S112, the search for the other broadcasting station channel is terminated in step S114 (EON DATA SEARCH). <-0). In addition, in step S116, it is determined whether to search for a channel set in the preset memory, and when it is determined that a user-selected program type channel exists among the broadcast channels stored in the preset memory, the preset in step S120. The first alternative frequency stored in the memory is loaded, and the above step S70 is repeated to perform a program type search for a channel received at the changed alternative frequency.

On the other hand, if the search for the preset memory is not performed as a result of the determination in step S116, the process proceeds to step S118 to set the frequency to 87.5MHz to perform a program type search for the entire frequency band.

As a result of the determination in step S92, when the program type search for the enhanced network group is not performed, it is determined in step S94 whether to perform the program type search for the preset memory. In this case, when performing a program type search for the preset memory, a program type search is performed by setting an alternate frequency stored in the corresponding preset memory in step S102, and stored in the preset memory in step S104. It is determined whether the search for all alternative frequencies is completed.

At this time, if a search for all alternative frequencies stored in the corresponding preset memory is not received, the process proceeds to step S106 to initialize the preset search, and to the reception frequency band in step S108. Set the frequency to 87.5 MHz for the search.

If there is no broadcast matching the program type of the user selection in the preset memory data in step S94, the process proceeds to step S96 to increase the currently set frequency by a predetermined frequency while Perform a search. At this time, if the last 108.0MHz in the entire reception frequency band in step (S98), the end of the search frequency check and setting in the next step (S100) and performs the step (S70) or less to search for the program type at 108.0MHz Perform.

The program type search control method of an RDS receiver according to the present invention is not limited to the above-described embodiments, and may be modified in various ways within the scope of the technical idea of the present invention.

As described above, the program type search control method of an RDS receiver according to the present invention does not perform a program type search through frequency sequential search within the entire frequency band when performing a program type search, EON DATA) Performs the corresponding program type search by giving priority to the data and the preset memory data.

Therefore, the program type can be performed at a faster time by performing a program type search for the preset memory and other broadcasting station related data, which store information on the broadcast channel that the user mainly listens, over the program type search in the entire frequency band. The effect of performing a search can be obtained. In addition, reducing the mute duration that occurs during program type search provides the user with the benefit of reducing defects that appear to be noise.

Claims (3)

A program type search of an RDS receiver that receives and demodulates an FM signal and an RDS signal transmitted from a broadcasting station, and detects program type information contained in the RDS signal from the demodulated signal and performs a program type search. In the control method, (A) if a program type for program type search is selected by the user's key input signal, searching for enhanced network (EON) group data and searching for the existence of a program type channel selected by the user; (B) performing a program type search for a channel stored in a preset memory when the selected program time does not exist in the EON group data; (C) Improvement of the judgment result of steps (a) and (b) If the selected program type does not exist in the network group data and the preset memory data, the program type search by sequential frequency tuning for the entire reception frequency band The program type search control method of an RDS receiver, characterized by comprising the step of performing. The method of claim 1, wherein step (a) (A) detecting and storing a set number of alternative frequencies from a list of alternative frequencies of the broadcast station-related data if a desired program type exists as a result of searching for enhanced network group data; (A) loading the first alternative frequency set in the detected alternative frequency list and setting a reception frequency to the corresponding alternative frequency; (A) detecting a signal received from the alternative frequency set in step (a) and determining whether it is receivable or, if receivable, searching for a program type from the received RDS data to determine whether it is a user-selected program type; (A4) If the user-selected program type does not exist in the received ALS signal as a result of the determination in step (A3), change the substitute frequency at which the current search is performed to the next alternative frequency in the list (A3). And repeating the following steps. The method of claim 1, wherein step (b) (B1) If the desired program type exists as a result of searching the RDS data stored in the preset memory, the number of alternative frequencies is detected from the list of alternative frequencies stored in the corresponding preset memory, and the first alternative frequency set in the list is received. Setting to frequency, (B2) determining whether a corresponding program type exists by determining a signal received from the reception frequency set in the step (b), and if the corresponding program type exists, receiving the corresponding broadcast channel; (B3) If the signal received from the changed alternative frequency is not the broadcast of the corresponding program type as a result of the determination of step (b2), the next alternative frequency on the alternative frequency list is set as the reception frequency and the above (b2) or less And repeating the steps of the program type search control method of an RDS receiver.