KR20070009050A - A car audio within double tuner and the control method therof - Google Patents

Abstract

A car audio device having double tuners and a control method therefor are provided to allow a user to continuously listen to broadcasting while another area broadcasting frequency signal of the same broadcasting is automatically searched and listen to the broadcasting of clean sound quality in a search-ended time by composing the two tuners. An antenna(190) acquires a broadcasting frequency signal. A main tuner unit(260) outputs the RSSI of a broadcasting frequency signal selected among broadcasting frequency signals acquired through the antenna(190) as a voltage, demodulates the selected broadcasting frequency signal, and outputs a baseband signal. An auxiliary tuner unit(270) outputs the strength of the receiving electric field of the broadcasting frequency signal selected among the acquired broadcasting signals as a voltage. A memory(120) stores area-classified frequency signals according to broadcasting stations. A control unit(210) controls the main tuner unit(260), the auxiliary tuner unit(270), and the memory(120).

Description

Car audio device having a double tuner and its control method {a car audio within double tuner and the control method therof}

1 is an electrical configuration of a car audio device having a conventional single tuner,

2 is an electrical diagram of a car audio device having a dual tuner according to the present invention;

3 is a flowchart illustrating a control method of a car audio device having a dual tuner according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

110, 210: control unit 120: memory

130: key input section 140: display section

150: speaker 160: tuner

170: PLL 190: Antenna

260: main tuner unit # 261: main tuner

262: Main PLL 270: Auxiliary Tuner

271: Auxiliary Tuner 272: Auxiliary PLL

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car audio device having a dual tuner and a control method thereof, and more particularly, to a car audio device having a double tuner capable of selecting regional broadcasting frequency signals of the same broadcast having a strong reception field while moving and a control method thereof. .

With the development of transportation, long-distance driving of drivers is increasing, and the radio is used as a means of collecting information and relieving boredom of the driver.

In general, car audio is a device that receives a broadcasting frequency signal captured through an antenna installed in a vehicle or plays a CD or a tape by driving a deck, and a vehicle's ignition key is inserted into an ignition key holder in a predetermined direction. When rotated to, the battery power of the vehicle is applied to operate. At this time, the car audio automatically selects the previously selected specific broadcast frequency signal or receives the specific broadcast frequency signal selected by the driver through the antenna installed in the vehicle and the tuner of the car audio, and the received signal is transmitted through the internal circuit to the speaker in the vehicle. Through the audible sound wave will be output.

On the other hand, radio stations use broadcasting frequency signals different from region to region, for example, MBC broadcasting uses Seoul (95.9), Chungbuk (96.1), and Gangwon (101.5). In this case, the driver has to operate the car audio up / down tuning button to find out the broadcasting frequency signal of the same area.

However, this method is not only easy to find other local broadcasting frequency signal of the same broadcast, but also very troublesome, and there is a problem that prevents safe driving.

Therefore, in order to solve this problem, a car audio having an automatic tuning function is disclosed in Korean Patent Registration No. 258697, 1999 Publication No. 4,47409 and 1998 Publication No. 82410.

1 is an electrical diagram of a conventional car audio device having a single tuner.

As shown in FIG. 1, a car audio device having a single tuner outputs an electric field strength of a broadcast signal selected from an antenna 190 for capturing a broadcast frequency signal, and a broadcast signal selected from the broadcast signals captured through the antenna 190. A tuner 160 that demodulates a broadcast signal and outputs it as a baseband signal, and receives a baseband signal from the tuner 160 and converts the baseband signal into an audible sound wave; The control unit 110 and the control unit for receiving the received electric field strength of the signal of the broadcast frequency selected from the 160 as a voltage to determine the received electric field strength, and if it is determined that the received electric field strength is weak, selecting a broadcast frequency signal of another region of the same broadcast. It is connected to the PLL (Phase Locked Loop) 170, which receives the broadcast frequency signal to be selected from the 110 and transmits a corresponding voltage to the tuner 160, The controller is connected to the key input unit 130 and the controller 110 to receive a frequency signal to be manually selected by the user, and is connected to the display unit 140 and the controller 110 displaying the currently selected broadcast frequency signal. And a memory 120 in which a broadcasting frequency signal for each region is stored for each selected broadcasting frequency signal and broadcasting station.

In the above-described configuration, the PLL 170 is a phase locked loop having a function of correcting a broadcast frequency signal selected by the tuner 160 when an error occurs with the broadcast frequency signal to be selected. The operation of a car audio with a conventional single tuner will now be described.

The tuner 160 selects a broadcast frequency according to the voltage input from the PLL 170 which receives the frequency signal to be selected from the controller 110, demodulates and amplifies the selected broadcast frequency signal to the speaker 150. The PLL 170 outputs the frequency of the selected broadcast frequency signal, and outputs the received electric field strength of the selected broadcast frequency signal to the controller 110 as a voltage.

The PLL 170, which receives the frequency of the selected broadcast frequency signal, compares with the frequency signal to be selected already received from the controller 110 to determine if an error occurs and sends the corrected voltage to the tuner 160, and selects the selected broadcast frequency signal. The controller 110 receiving the received electric field strength as a voltage determines whether the received electric field strength voltage is weak, and if it is weak, reads out local broadcasting frequency data of the currently selected broadcast from the memory 120 in order and outputs it to the PLL 170. do.

Thereafter, the PLL 170 receiving the broadcast frequency signals to be selected in order sends the voltages of the broadcast frequency signals to be selected to the tuner 160, and the tuner 160 receiving the voltages of the broadcast frequency signals to be selected according to the input voltage. The broadcast frequency signals are sequentially received through the antenna 190, and the received electric field strengths of the received broadcast frequency signals are sequentially transmitted to the controller 110 as voltages. After that, the control unit 110 selects the local broadcasting frequency signal having the strongest electric field strength and transmits the selected broadcasting frequency signal to the PLL 170 again, and receives a voltage corresponding to the broadcasting frequency signal selected from the PLL 170. The 160 receives the local broadcast with the strongest electric field of the same broadcast and transmits it to the speaker 150.

Therefore, even if the driver moves to another area, the driver can receive the same broadcast with clean sound quality.

According to the conventional audio system with a single tuner, by detecting the electric field strength of the currently selected broadcast frequency signal and automatically tuning to the other broadcast frequency signal of the same broadcast according to the region, it is possible to receive a clean sound quality on the go. On the other hand, while searching for other local broadcast frequency signals of the same broadcast, there was a problem that the broadcast cannot be heard.

The present invention has been made to solve the above-mentioned problems, and by providing two tuners, it is possible to continue to listen to the broadcast while automatically searching for other local broadcast frequency signals of the same broadcast. It is an object of the present invention to provide a car audio device having a dual tuner capable of listening to broadcasts of sound quality and a control method thereof.

Car audio apparatus having a dual tuner of the present invention for achieving the above object is an antenna for capturing a broadcast frequency signal; A main tuner unit for outputting a received electric field strength of a broadcast frequency signal selected from the broadcast frequency signals captured by the antenna as a voltage, and demodulating the selected broadcast frequency signal as a baseband signal; An auxiliary tuner unit outputting a received electric field strength of a broadcast frequency signal selected from the captured broadcast frequency signals as a voltage; Provided is a car audio device comprising a memory for storing regional frequency signals for each broadcasting station, and a control unit for controlling the main tuner unit, the sub tuner unit, and the memory.

Hereinafter, with reference to the accompanying drawings will be described in detail a car audio device having a dual tuner and a control method thereof according to a preferred embodiment of the present invention.

2 is an electrical diagram of a car audio device having a dual tuner according to the present invention.

As shown in FIG. 2, a car audio device having a dual tuner according to the present invention includes an antenna 190 for capturing a broadcast frequency signal and a received electric field strength of a broadcast frequency signal selected from the broadcast frequency signals captured through the antenna 190. Outputs a voltage, and the main tuner unit 260 for demodulating and amplifying the selected broadcast frequency signal and outputting it as a baseband signal, and the auxiliary tuner unit for outputting the received electric field strength of the selected broadcast frequency signal through the antenna 190 as a voltage. 270, the reception field strength of the broadcasting frequency signal selected from the speaker 150, the main tuner 260 and the auxiliary tuner 270, which receives the baseband signal from the main tutor 260 and converts it into an audible sound wave. Is inputted as a voltage to determine the received electric field strength, if it is determined that the received electric field strength is weak, the control unit 210 for selecting a broadcast frequency signal of another region of the same broadcast, The display unit 140 and the controller 210 connected to the fisherman 210 and connected to the key input unit 130 to receive a broadcast frequency to be manually received from the user and the controller 210 to display a currently selected broadcast frequency signal. It is connected to the, and the main tuner 260 comprises a memory 120 is stored in the last selected broadcast frequency signal and broadcast frequency signal for each broadcasting station.

In the above configuration, the main tuner unit 260 outputs the received electric field strength of the selected broadcast frequency signal as a voltage, checks the selected broadcast frequency signal, outputs it as a baseband signal, and outputs the frequency of the selected broadcast frequency signal. The main broadcast signal 262 corrects the selected broadcast frequency signal and a broadcast frequency signal to be selected when an error occurs, and receives a broadcast frequency signal to be selected from the controller 210 and transmits a corresponding voltage to the main tuner 261. The auxiliary tuner unit 270 outputs the received electric field strength of the selected broadcast frequency signal through the antenna 190 as a voltage, and the auxiliary tuner 271 outputs the frequency of the selected broadcast frequency signal, and the selected broadcast frequency. When the error occurs and the broadcast frequency signal to be selected signal is corrected, and receives the broadcast frequency signal to be selected from the control unit 210 corresponding It comprises a secondary PLL (273) for transmitting the pressure to the secondary tuner (271).

3 is a flowchart illustrating a control method of a car audio device having a dual tuner according to the present invention, in which step S11 is a step of receiving a car audio on command from a driver or an ignition switch, and step S13 is a radio mode currently executed. Determining the steps. As a result of the determination in step S13, if it is not the radio mode, the operation proceeds to step S37, and in the radio mode, the operation proceeds to step S15. In the case of the radio mode, the local frequency signal of the last selected broadcasting station is read from the memory 120, and the main mode is read. Transfer to the tuner unit 260. Step S17 is a step of determining whether the received electric field strength voltage of the broadcast frequency signal selected from the main tuner 260 is input. As a result of the determination in step S17, if the received field strength voltage is not input, step S17 is repeated until the received field strength voltage of the selected broadcast frequency signal is input, and if the received field strength voltage is input, the process proceeds to step S19 to key input. Judge whether there is. As a result of the determination in step S19, if there is a key input, the process proceeds to step S27 to determine whether a broadcast station change command is received. If there is no key input, it is determined whether the received electric field strength voltage from the main tuner is weak.

As a result of the determination in the next step S21, if the received field strength voltage is strong, the process returns to step S19. If the received field strength voltage is weak, the process proceeds to step S23. Transfer to the tuner unit 270. Subsequently, in step S25, the reception electric field strength of the broadcasting frequency signal for each region transmitted to the auxiliary tuner unit 270 is input as a voltage, and the broadcasting frequency signal having the largest voltage is transmitted to the main tuner unit 260. At this time, while performing steps S23 and S25, the broadcast received from the main tuner 260 is continuously output from the speaker 150.

On the other hand, if the determination result in step S27 is not a broadcast station change command, the flow proceeds to step S39 to perform a command corresponding to a key input. In the case of a broadcast station change command, the flow proceeds to step S29 to determine the broadcast station selected by the auxiliary tuner unit 270. Passes the fundamental frequency signal.

Next step S31 is a step of determining whether the received electric field strength voltage of the broadcast frequency signal selected from the auxiliary tuner unit 270 is input. As a result of the determination in step S31, if the received electric field strength voltage is not input, the process is repeated. Judging. As a result of the determination in step S33, when the received field strength voltage is strong, the process proceeds to step S35, and the selected frequency signal is transmitted to the main tuner unit 260. When the received field strength voltage is weak, the process proceeds to step S23 again.

The car audio device having the dual tuner of the present invention and its control method are not limited to the above-described embodiments, and can be modified in various ways within the scope of the technical idea of the present invention.

According to the car audio device having the dual tuner and the control method of the present invention as described above, when the received field strength voltage input from the main tuner is weak, the broadcast received by the main tuner maintains the output to the speaker, Control the auxiliary tuner to search the local broadcasting frequency signal with the strongest reception field among the same broadcasts, and then deliver the broadcasting frequency signal with the strongest reception field among the confirmed local broadcasting frequency signals of the same broadcast to the main tuner to continue broadcasting. While listening, it is convenient to search for other local broadcasting frequency signals of the same broadcast with the strongest electric field.

Claims (3)

An antenna for capturing a broadcast frequency signal; A main tuner unit for outputting a received electric field strength of a broadcast frequency signal selected from the broadcast frequency signals captured by the antenna as a voltage, and demodulating the selected broadcast frequency signal as a baseband signal; An auxiliary tuner unit outputting a received electric field strength of a broadcast frequency signal selected from the captured broadcast frequency signals as a voltage; Memory where regional frequency signals are stored for each broadcasting station and And a dual tuner comprising a control unit for controlling the main tuner unit, the sub tuner unit, and the memory. The method of claim 1, The auxiliary tuner outputs a frequency of the selected broadcast frequency signal, receives an auxiliary tuner for outputting the received electric field strength of the selected broadcast frequency signal as a voltage and a broadcast frequency signal to be selected from the controller, and selects a voltage corresponding to the broadcast frequency signal to be selected. Car audio device having a dual tuner, characterized in that the auxiliary PLL to pass to the auxiliary tuner. An antenna for capturing a broadcast frequency signal; A main tuner unit for outputting a received electric field strength of a broadcast frequency signal selected from the broadcast frequency signals captured by the antenna as a voltage, and demodulating the selected broadcast frequency signal as a baseband signal; An auxiliary tuner unit outputting a received electric field strength of a broadcast frequency signal selected from the captured broadcast frequency signals as a voltage; It is performed in a car audio device having a memory in which a regional frequency signal is stored for each broadcasting station, and a dual tuner including the main tuner unit, the auxiliary tuner unit, and a control unit for controlling the memory. (a) receiving the received electric field strength of the currently selected broadcast frequency signal from the main tuner as a voltage and confirming it; (b) when the input voltage is low as a result of checking in step (a), reading local broadcasting frequency signals of the broadcasting currently selected by the main tuner unit from the memory and outputting the signals to the auxiliary tuner unit; and (c) receiving a received electric field strength of the local broadcasting frequency signals output to the auxiliary tuner unit as a voltage from the auxiliary tuner unit, selecting a local broadcasting frequency signal having the strongest voltage, and selecting the selected broadcasting frequency as the main tuner; Control method of a car audio device having a dual tuner comprising the step of output to the negative.

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