KR100283431B1 - Alternative Frequency Storage Method of Radio Data System - Google Patents

Abstract

The present invention sets an alternative frequency check time according to the reception sensitivity of the RDS broadcast currently being received, and when another broadcast is received when performing tuning to the alternative frequency at the set time, stores a new alternative frequency list except for the corresponding alternative frequency. The present invention relates to a method of storing an alternative frequency of a radio data system (RDS) which can prevent intermittent reception of other RDS broadcasts having the same alternative frequency. Set the alternative frequency check level and check time according to the sensitivity, and when the check time is reached, perform the check interrupt routine to control tuning to the alternative frequency, and then replace the alternative frequency being checked if the received broadcast is another one. Exclude from frequency list to save new alternative frequency list A, it is possible to prevent in advance to be received by the other broadcast when tuned to the alternate frequency.

Description

Alternative Frequency Storage Method of Radio Data System

The present invention relates to a method of storing an alternate frequency of a radio data system (RDS), and in particular, sets an alternative frequency check time according to a reception sensitivity of an RDS broadcast currently being received, When other broadcasting is received when performing tuning to an alternative frequency, the radio data system saves a list of new alternative frequencies except the corresponding alternative frequency, thereby preventing other RDS broadcasts having the same alternative frequency from being intermittently received. (RDS) of alternative frequency storage method.

Conventional radio data system (RDS) is a key input unit for selecting the operation of the radio data system by the key operation, a microcomputer to control the operation of the RDS tuner or tape deck and the operation of each unit according to the key selection of the key input unit, A frequency control unit (VCO + PLL) for controlling the tuning frequency according to the control of the microcomputer, an RDS tuner for tuning an RDS broadcasting station according to the frequency control unit, and a demodulation unit for demodulating the RDS composite signal of the RDS tuner and outputting an audio signal; An amplification unit for amplifying the output signal of the demodulation unit, a speaker for outputting the amplified audio signal as an audible sound wave, an RDS data processing unit for extracting RDS data from the RDS composite signal from the RDS tuner and providing the microcomputer to the microcomputer; A memory 18 capable of reading and riding data such as a frequency, and a display unit 19 for displaying characters according to control on a microcomputer on a screen. It becomes bait.

The conventional radio data system, which is constituted as described above, lacks countermeasures for a program identification code (hereinafter referred to as "PI") included in each RDS broadcast signal, and thus, an alternative frequency of the currently received RDS broadcast while listening to the selected RDS broadcast. Because of the intermittent reception of other RDS broadcasts that contain the same alternative frequency as, this has been a problem because it acts as a noise and reduces the listening pleasure of the broadcast, as well as degrading the reliability of radio data system products.

The present invention has been made to solve the above problems, and therefore, an object of the present invention is to set an alternative frequency check time according to the reception sensitivity of an RDS broadcast currently being received, and to perform tuning to an alternative frequency at a set time. When a broadcast is received, a method of storing an alternative frequency of a radio data system (RDS) to store a new list of alternative frequencies except for the corresponding alternative frequency, thereby preventing intermittent reception of other RDS broadcasts having the same alternative frequency. To provide.

1 is a block diagram of a radio data system for carrying out the present invention.

2 is a flow chart showing an alternative frequency storage method of a radio data system (RDS) according to the present invention.

Explanation of symbols on the main parts of the drawings

5: key input unit 10: microcomputer

12: RDS tuner 13: demodulator

14: amplifier 15: speaker

16: RDS data processing unit 17: Dape deck

18: memory 19: display

As a technical means for achieving the above object of the present invention, the method of the present invention comprises a first step of controlling the tuning according to the broadcast selection when the power of the radio data system; A second step of storing an alternative frequency list from the received RDS data according to the tuning control of the first step; Determining a check level according to the sensitivity of the received signal and setting an alternative frequency check time according to the check level; A fourth step of determining whether the determined check level is a check level that requires a check and proceeding to a fifth step if it is a check level, and proceeding to an eleventh step if it is not a check level; A fifth step of performing a check interrupt routine when the check time comes; A sixth step of performing tuning at the corresponding alternative frequency; A seventh step of determining whether the PIs are the same and proceeding to the eighth step if they match, and storing a new alternative frequency list excluding the checked alternative frequencies; An eighth step of determining whether the alternative frequency being checked is the last alternative frequency and proceeding to the beginning of the ninth step if it is not the last alternative frequency, and proceeding to the tenth step if the last alternative frequency; A ninth step of determining whether the determined check level is a full check level and proceeding to a sixth step to check a next alternative frequency if the entire check level is determined, or a tenth step; A tenth step of releasing the check interrupt routine; An eleventh step of determining whether the power is off and proceeding to the fifth step to check a next alternative frequency if the power is off, and terminating if the power is off; Characterized in that made.

Hereinafter, a radio data system (RDS) according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a radio data system for carrying out the present invention. Referring to FIG. 1, a radio data system for carrying out the present invention is a key input unit 5 for selecting an operation of a radio data system by a key operation. And control the operation of the RDS tuner or tape deck and the operation of each unit according to the key selection of the key input unit 5, and control the screen output of the operation state information, and also replace it according to the reception sensitivity of the selected broadcast. Micom that sets the frequency check level and check time and stores a new substitute frequency list excluding the currently checked alternative frequency list from the substitute frequency list when the reception by tuning to the corresponding alternate frequency is different. ), A frequency controller (including VCO + PLL) 11 for controlling the tuning frequency under the control of the microcomputer 10, and the frequency controller 11 An RDS tuner 12 for tuning an RDS broadcast station, a demodulator 13 for demodulating the RDS composite signal of the RDS tuner 12 to output an audio signal, and an amplification for amplifying the output signal of the demodulator 13; The unit 14, the speaker 15 for outputting the audio signal from the amplifier 14 as an audible sound wave, and the RDS data from the RDS composite signal from the RDS tuner 12 are extracted to the microcomputer 10. An RDS data processing unit 16 to be provided, a memory 18 capable of reading / ride data such as an alternative frequency, and a display unit 19 for displaying characters under control on the microcomputer 10 on a screen. .

Operation according to the present invention configured as described above will be described in detail below based on the accompanying drawings.

Before describing an alternative frequency storing method of a radio data system (RDS) according to the present invention with reference to FIGS. 1 and 2, the overall operation of the radio data system implementing the present invention will be briefly described. The RDS tuner 12 tunes the received RDS broadcast signal, selects a desired broadcast, and outputs an RDS composite signal, which is an intermediate frequency signal, which is demodulated by the demodulator 13 into an audio signal and then amplified. Amplified by 14 and output as an audible sound wave through the speaker 15, the demodulator 13 outputs a detection signal (SD) corresponding to the reception sensitivity.

The RDS data signal of the RDS composite signal is processed by the RDS data processing unit 16 to extract the PI of the broadcast currently being received and alternative frequency (AF) information corresponding to the PI, and provide it to the microcomputer.

A method of storing alternative frequencies in a radio data system operating as described above is as follows.

First, in the first steps 21 and 22, when the power of the radio data system is turned on, tuning is controlled according to the broadcast selection. Specifically, after the power of the radio data system is turned on, the currently selected or key input unit 5 is turned on. When the broadcast is selected through the control unit, the microcomputer 10 recognizes the selected broadcast and controls the corresponding RDS broadcasting station by controlling the frequency control unit 11 with the RDS tuner 12. The RDS tuner 12 selects the corresponding RDS broadcast. Outputting the RDS composite signal, and based on the RDS composite signal, the demodulator 13 provides a signal corresponding to the reception sensitivity SD to the microcomputer 10, and the RDS data processing unit 16 RDS data such as PI and alternative frequency are provided to the microcomputer 10 from the composite signal.

In the second step 23, the microcomputer 10 stores the replacement frequency list in the memory 18 from the RDS data received according to the tuning control in the first step 22.

In the third step 24, the microcomputer 10 determines the check level according to the sensitivity of the received signal provided from the demodulator 13, and sets the alternative frequency check time according to the check level. According to the reception sensitivity, it is divided into "A", "B", "C", and "D" level. When the "A" level is the optimal reception sensitivity, the alternative frequency is not checked, and the reception sensitivity of the upper level " In case of "B" level, the alternate frequencies are checked one by one in the alternative frequency list at 5 second intervals, and in case of the "C" level, which is the reception sensitivity of the intermediate level, the alternative frequencies are checked one by one in the alternative frequency list at 15 second intervals. In case of the "D" level, which is the reception sensitivity of the lower level, all alternative frequencies on the alternative frequency list are checked.

In the fourth step 25, it is determined whether the determined check level is a check level that requires a check, and if it is a check level such as the "B", "C", "D" level, etc., the process proceeds to the fifth step 26, which is the next step. If the check level is not the same as the "A" level, the control proceeds to step 11 (34).

In the fifth step (26, 27), when the check time of the corresponding check level is reached, the check interrupt routine is performed. For example, when the reception sensitivity of the selected broadcast is "B" level, the alternative frequency is checked every 5 seconds. Therefore, the check interrupt routine is executed every 5 seconds.

In the sixth step 28, the tuning is performed using the corresponding replacement frequency, which is read by the microcomputer 10 in order of the alternative frequency list stored in the memory 18, and then the tuning to the alternative frequency is performed by the frequency controller. 11) and the RDS tuner 12 for control.

In the seventh step (29, 30), if the PI of the RDS data received by tuning to the alternate frequency is compared with the PI before the execution of the interrupt routine, and if it matches, proceeds to the next step (8) (31). If it does not match, it saves the list of new alternative frequencies except the one being checked.

The new alternative frequency list modified in this way has a low reception sensitivity of the representative frequency in a specific broadcast, so when performing tuning to an alternative frequency, the alternative frequency that other broadcasts can receive is excluded from the alternative frequency list. It is used to allow this to be prevented.

In the eighth step 31, it is determined whether the alternative frequency being checked is the last alternative frequency, and if it is not the last alternative frequency, the process proceeds to the beginning of the ninth step 32, which is the next step. Skip to step 10.

In the ninth step 32, it is determined whether the determined check level is the entire check level. If the determined check level is the same as the "D" level, the process proceeds to the sixth step 28 to check the next alternative frequency. The next step is the tenth step 33.

In the tenth step 33, the check interrupt routine is released, and the microcomputer 10 controls the normal tuning before the check interrupt routine.

In the eleventh step 34, it is determined whether the power is turned off, and if not, the flow proceeds to the fifth step 26 to check the next alternative frequency, and when the power is turned off, the entire operation ends.

According to the present invention as described above, the alternative frequency check level and the check time is set according to the reception sensitivity of the broadcast selected in the radio data system, and when the check time is reached, a check interrupt routine is performed to control tuning to the alternative frequency. After that, if the received broadcast is another broadcast, the checked alternative frequency is excluded from the alternative frequency list and the new alternative frequency list is stored to prevent other broadcasts from being received when tuning to the alternative frequency. Will be.

According to the present invention as described above, if the alternative frequency check time is set according to the reception sensitivity of the RDS broadcast currently being received, and other broadcasts are received when performing tuning to the alternative frequency at the set time, except for the corresponding alternative frequency By storing the alternative frequency list, there is a special effect of preventing other RDS broadcasts having the same alternative frequency from being intermittently received.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

Claims (1)

A first step (21, 22) of controlling tuning according to broadcast selection when the radio data system is turned on; A second step (23) of storing the alternative frequency list from the received RDS data according to the tuning control of the first step (22); A third step (24) of determining a check level according to the sensitivity of the received signal and setting an alternative frequency check time according to the check level; A fourth step 25 of determining whether the determined check level is a check level that requires a check and proceeding to a fifth step 26 if it is a check level, and proceeding to an eleventh step 34 if it is not a check level; A fifth step (26, 27) of performing a check interrupt routine when the check time comes; A sixth step 28 of performing tuning at the corresponding alternative frequency; Judging whether the PIs are the same, and if they match, proceed to the eighth step 31; if they do not match, seventh steps 29 and 30 to store a new alternative frequency list excluding the checked alternative frequencies; An eighth step 31 of determining whether the alternative frequency being checked is the last alternative frequency and proceeding to the beginning of the ninth step 32 if it is not the last alternative frequency, and proceeding to the tenth step if the last alternative frequency; If it is determined that the determined check level is the entire check level, and if it is the entire check level, the process proceeds to the sixth step 28 to check the next alternative frequency; otherwise, the ninth step 32 proceeds to the tenth step 33. ); A tenth step 33 of releasing the check interrupt routine; An eleventh step 34 of determining whether the power is off and proceeding to the fifth step 26 to check the next alternative frequency if the power is off and ending if the power is off; Alternative frequency storage method of a radio data system (RDS), characterized in that consisting of.