KR20000026071A - Tuning method at passing border of broadcasting transmitting region - Google Patents

Abstract

The present invention relates to a car audio device and method capable of automatic tuning of the same broadcast when passing through the transmission boundary. The apparatus of the present invention tunes a selected transmission frequency belonging to a first broadcasting region from a high frequency signal received through an antenna attached to a vehicle, demodulates the tuned broadcasting signal, outputs an audio signal, and receives the tuned broadcasting signal. A tuner unit for outputting an electric field detection signal, an audio output unit for amplifying an audio signal provided from the tuner unit, and outputting the amplified signal through a speaker, a memory storing a broadcasting frequency table for each broadcasting broadcasting region of a plurality of broadcasting stations, and A selector for selecting a frequency and a tuning signal corresponding to the selected transmission frequency are provided to the tuner, and a strong electric field is detected when the reception level of the received electric field detection signal currently provided from the tuner is detected as a weak electric field. Perform an automatic tuning operation until a strong electric field is detected; By checking the second broadcast transmission area to which the transmission frequency detected by the strong electric field belongs, and tuning corresponding to the broadcast frequency belonging to the same broadcast station as the broadcast received in the first broadcast transmission area and belonging to the checked second broadcast transmission area. And a control unit for providing a signal to the tuner unit. Therefore, in the present invention, the same station can be tuned automatically when passing the boundary of the broadcasting transmission area while the vehicle is moving, so that continuous broadcasting can be enjoyed.

Description

Car audio device and method capable of automatic tuning of the same broadcasting system when crossing the broadcasting transmission area

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car audio device and a method thereof capable of automatic tuning when passing through a boundary of a broadcasting transmission area, and more particularly, to a second audio transmission passing through a first broadcasting transmission area while driving while listening to a first broadcasting in a first broadcasting transmission area. A car audio device and a method for automatically tuning a first broadcast of a second broadcast transmission area in order to continuously listen to a broadcast of the same series as a broadcast that was listened to in a first broadcast transmission area when entering a broadcast transmission area. It is about.

In general, the car audio device listens to AM and FM radio broadcasts while the vehicle is driving. When the car audio device leaves the first broadcast transmission area, the car audio device cannot listen to the broadcast. That is, when passing through the boundary area, the broadcast signal being listened is out of the transmission range, and thus the signal received by the antenna is in a weak electric field state below the reception sensitivity, so that it is impossible to continue listening. In addition, only the noise is generated in the weak electric field state, which may cause discomfort to the driver, and the driver may consider channel switching and provide a cause of a traffic accident due to inattention of driving due to the channel switching operation.

On the other hand, radio broadcasts generally use different transmission frequencies according to the transmission area, so the driver cannot recognize the transmission frequencies in all areas. In order to continuously listen to the same series of broadcasts in the second broadcast transmission area, there is a need to search for the same broadcast while scanning the tuning frequency.

That is, in general, a car audio device presses and releases a broadcast search key within a predetermined time, and changes the frequency by one step at a predetermined frequency interval. The system will automatically search for broadcasts by changing the frequency until the system is searched. Therefore, the user has to repeatedly press and release the broadcast search key until the desired broadcast is received, listen to the broadcast received by the strong electric field detection, and determine whether the broadcast is the desired broadcast. This repetitive process is very troublesome and inconvenient to use, and there is a problem that the driver's operation during driving causes a traffic accident.

The object of the present invention is to automatically determine this when passing through the boundary of the broadcast transmission area, search for the transmission frequency of the same series broadcast as the previously listened broadcast, and tune the searched transmission frequency to solve the problems of the prior art. In addition, the present invention provides a car audio device and a method thereof, which enable automatic tuning of a broadcasting transmission area boundary that can improve the user's convenience by allowing the user to continuously listen to the same series of broadcasts.

1 is a block diagram showing the configuration of a car audio device capable of automatic tuning when passing through the boundary of the broadcasting transmission area according to the present invention.

FIG. 2 is a broadcasting station transmitting frequency table for each broadcasting transmitting region stored in the memory of FIG. 1. FIG.

3 is a flowchart for explaining an automatic tuning method when passing through a broadcasting transmission area boundary according to the present invention.

4 is a view for explaining a broadcasting transmission area.

<Description of the symbols for the main parts of the drawings>

10: tuner portion 12: audio processing portion

14: control unit 16: selection unit

18: display unit 20: memory

22: Other audio source (optical disk player, tape player)

In order to achieve the above object of the present invention, the apparatus of the present invention tunes a selected transmission frequency belonging to a first broadcasting region from a high frequency signal received through an antenna attached to a vehicle, and demodulates the tuned broadcasting signal to perform audio. A tuner unit for outputting a signal and outputting a received electric field detection signal of the tuned broadcast signal, an audio output unit for amplifying an audio signal provided from the tuner unit and outputting the amplified signal through a speaker, and broadcasting of a plurality of broadcasting stations A memory storing a region-specific transmission frequency table, a selection unit for selecting a transmission frequency, and a tuning signal corresponding to the selected transmission frequency are provided to the tuner unit, and the reception level of the reception field detection signal currently provided from the tuner unit is increased. If it is detected as a weak electric field, automatic tuning operation is performed until a strong electric field is detected. Is detected, referring to the table of the memory, the second broadcast transmission zone to which the transmission frequency at which the strong electric field is detected belongs is checked, and the broadcast belongs to the checked second broadcast transmission region and is received in the first broadcast transmission region. And a control unit for providing a tuning signal corresponding to a transmission frequency of a broadcasting station series.

In addition, the method of the present invention provides a method of tuning a selected broadcast frequency in a first broadcast transmission region, receiving a broadcast of the tuned broadcast frequency, and detecting a weak electric field by the vehicle when the received electric field of the received broadcast is detected. Recognizing that the first broadcast transmission region and the second broadcasting transmission region have passed the boundary, and tuning the broadcasting frequency of the same broadcasting station as the broadcasting frequency received in the first broadcasting transmission region, and using the broadcasting frequency of the second broadcasting transmission region. Receiving the tuned broadcast.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention through an embodiment of the present invention.

1 illustrates a configuration of a car audio device capable of automatic tuning when passing through a boundary of a broadcasting transmission area according to the present invention. In FIG. 1, a car audio device according to the present invention includes a tuner unit 10, an audio output unit 12, a controller 14, a selector 16, a display unit 18, a memory 20, and the like.

The tuner unit 10 is largely divided into an FM receiver and an AM receiver. The FM receiver separates and amplifies the tuned intermediate frequency from the high frequency signal received through the antenna ANT from the high frequency signal received from the high frequency signal received from the antenna ANT and the high frequency signal provided from the FM receiver. IF) and a detector DET for demodulating the intermediate frequency provided from the intermediate frequency detector IF to output stereo audio signals L and R. The AM receiver separates and amplifies the tuned intermediate frequency from the high frequency signal received from the antenna ANT from the high frequency signal received through the antenna ANT and the high frequency signal provided from the AM receiver. IF) and a detector DET for demodulating the intermediate frequency provided from the intermediate frequency detector IF to output a mono audio signal M.

In addition, the tuner unit 10 detects a reception level of the high frequency signal received through the antenna, and provides the control unit 14 with a reception field detection voltage VF corresponding to the detected reception level, and the FM from the control unit 14. After receiving AM tuning signal, it performs automatic tuning operation.

The audio output unit 12 controls the audio signal provided from the tuner unit 10 and the audio signals provided from another audio source 22, such as an audio cassette player, an optical disc player, etc., provided by the controller 14. A multiplexer (MUX) for selecting in response to the signal, performing a noise canceling and equalizing function of the selected audio signal, and outputting the processed audio signal as the front stereo signal FL and FR and the rear stereo signal RS and RR; A power amplifier (PA) for amplifying the audio signal selected and processed by the multiplexer (MUX), a front stereo speaker (FLSP, FRSP) and a rear stereo speaker (RLSP, respectively) driven by the audio signal amplified by the power amplifier RRSP).

The selector 16 includes a key input unit installed in front of the set of the car audio device and provided with various command keys, and generates key signals in response to the command key input.

The display unit 18 is composed of a liquid crystal display, a fluorescent display tube, or the like to indicate the use state of the system, and displays the tuned frequency and the like.

The memory 20 is composed of a nonvolatile memory such as a ROM, an EPROM, an EEPROM, and a flash memory, and as shown in FIG. 2, a transmission frequency table for each broadcasting transmission region is created and stored. The table is created as a broadcasting frequency FXi for each broadcasting broadcasting region L1 to Lm corresponding to each broadcasting station B1 to Bn according to the FM and AM frequency bands.

For example, the transmission frequency of the KBS first FM broadcast has the following transmission frequencies according to 24 regions.

Country Frequency (MHz) Country Frequency (MHz) Headquarters 93.1 Jeonju 100.7 Busan 92.7 Nam Won 92.9 Ulsan 101.9 Daejeon 98.5 Changwon 93.9 Rice wine 102.1 Pearl 102.5 Rice wine 94.1 Pearl 89.3 Chungju 100.3 Dae-gu 89.7 Chun Cheon 91.1 Andong 88.1 Won-ju 89.5 Pohang 93.5 Tae Baek 97.3 Gwangju 92.3 Gangneung 89.1 Thu Po 98.3 Jeju 96.3 Yeo su 94.5 Jeju 99.9

The controller 14 includes a microprocessor and a peripheral interface circuit. The controller 14 performs a control program for automatic tuning of the same series broadcast when passing through the border area. The control program may include tuning a selected broadcast frequency in a first broadcast transmission region, receiving a broadcast of the tuned broadcast frequency, and when the received electric field of the received broadcast detects a weak electric field, the vehicle broadcasts the first broadcast. Recognizing that it has passed the boundary between the transmitting area and the second broadcasting area and tuning the broadcasting frequency of the same broadcasting station as the broadcasting frequency received in the first broadcasting area, and tuning to the broadcasting frequency of the second broadcasting area. And receiving the broadcast.

3 is a flowchart illustrating an automatic tuning method when passing through a boundary of a broadcast transmission area according to the present invention, and FIG. 4 is a view for explaining a broadcast transmission area. Referring to Figures 3 and 4 will be described in detail a preferred embodiment of the present invention.

Referring to FIG. 3, when the driver drives the first broadcast transmission area L1 of FIG. 4, for example, the point X1 of the Gyeongin area, the driver may broadcast the first broadcast Bp through the selection unit 16 of the car audio device. For example, when the KBS first FM broadcast is selected, the control unit 14 provides the tuner unit 10 with a corresponding tuning signal, for example, a tuning signal for tuning 93.1 MHz. The tuner unit 10 tunes 93.1 MHz using the provided tuning signal, detects an IF signal of 10.7 MHz from the tuned frequency, and FM-demodulates the detected IF signal to output a stereo signal (300).

The broadcast signal received through the tuner unit 10 is output through the speaker to receive the broadcast (302). At the same time, the tuner unit 10 generates a received electric field detection signal of the received signal and provides it to the controller 14. The controller 14 checks whether or not the level of the received electric field detection signal is equal to or less than the set reception sensitivity, for example, 1 / 3VDD or more (304). If it is 1 / 3VDD or more in step 304, it is recognized as a strong electric field and it is checked whether there is a frequency change by the user (306). If there is a frequency change in step 306, step 300 is performed to tune the broadcast of the new frequency to receive the broadcast. If there is no change in step 306, step 302 is continued.

When the level of the received electric field detection signal falls below 1/3 VDD in step 304, that is, when the vehicle is moved from the X1 point to the X2 point, the second boundary area L2 is moved out of the boundary area of the first broadcasting transmission area L1. ) Is the time to enter. For example, on the Gyeongbu Expressway, at the location of Cheonan, the transmission frequency of the Gyeongin area is mixed with noise, making it difficult to hear.

As described above, when the weak electric field is detected, the controller 14 performs an automatic tuning operation (308). In step 308, it is checked whether the strong electric field is detected by the automatic tuning operation (310). If the strong electric field is detected in step 310, automatic tuning is stopped (312). The transmission frequency L2 of the tuning frequency in which auto-tuning is stopped, that is, the reception frequency fr at which the strong electric field is detected, is checked with reference to the table created in the memory 20 (314).

In operation 314, it is checked whether the frequency at which the strong electric field is received is the same frequency as that of the broadcasting station Bp finally selected in the first broadcast transmission region L1 (316).

If the frequency of the same broadcast sequence in step 316 to perform the step 302 to receive the broadcast. If it is not the frequency of the same broadcast sequence in step 316, the broadcast frequency of the same broadcast sequence as that previously received in the second broadcast transmission region L2 is selected with reference to the table (318), and the tuning signal corresponding to the selected frequency is selected. It is provided to the tuner part. The tuner 10 performs step 300 to tune the newly selected transmission frequency.

That is, when entering the second broadcasting transmission region (L2), for example, Cheongju region, the Cheongju KBS first FM broadcast 102.1MHz, which is the same series as the KBS first FM broadcasting selected in the previous region, that is, the Gyeongin region, is selected. 1 You can listen to FM broadcasts.

As described above, in the present invention, when listening to the first broadcast in the first area, when passing through the boundary point between the first area and the second area that deviates from the transmission range of the first broadcast, the second system of the same series as the first broadcast is automatically transmitted. Since the second station of the region can be selected and listened to, it is possible not only to reduce the hassle and safety risks of manually changing the station while the driver is driving, but also to transmit the same series of broadcasts in the second region beyond the first region. By selecting, it is possible to continuously listen to the national broadcast program despite the change in the transmission frequency, thereby achieving high quality and high quality of the car audio device.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (3)

From the high frequency signal received through the antenna attached to the vehicle, the selected transmission frequency belonging to the first broadcasting region is tuned, the tuned broadcasting signal is demodulated, the audio signal is output, and the received field detection signal of the tuned broadcasting signal is output. A tuner section; An audio output unit for amplifying the audio signal provided from the tuner unit and outputting the amplified signal through a speaker; A memory for storing a broadcasting frequency table for each broadcasting broadcasting region of a plurality of broadcasting stations; A selection unit for selecting a transmission frequency; Providing a tuning signal corresponding to the selected transmission frequency to the tuner unit, and if the reception level of the reception field detection signal currently provided from the tuner unit is detected as a weak field, perform an automatic tuning operation until a strong electric field is detected, When the strong electric field is detected, referring to the table of the memory, the second broadcast transmission area to which the transmission frequency at which the strong electric field is detected belongs is checked, and belongs to the checked second broadcast transmission area and is received at the first broadcast transmission area. And a control unit for providing a tuning signal corresponding to a transmission frequency of a broadcasting station sequence identical to that of a broadcasting unit, in the tuner unit. Tuning the selected broadcast frequency in the first broadcast transmission region; Receiving a broadcast of the tuned broadcast frequency; When the received electric field of the received broadcast detects the weak electric field, the vehicle recognizes that the vehicle has passed the boundary between the first broadcast area and the second broadcast area and broadcasts the same broadcast station as the broadcast frequency received in the first broadcast area. Tuning the frequency; And receiving a tune tuned to a broadcast frequency of the second broadcast coverage region. The method of claim 3, wherein the tuning of the broadcast frequency of the same broadcast station is Upon detection of the weak electric field, performing automatic tuning until a strong electric field is detected; Checking a broadcast transmission area to which a received broadcast frequency belongs by referring to a broadcast frequency table for each broadcast transmission area when the strong electric field is detected by the automatic tuning; Tuning a broadcast frequency of a broadcast station identical to a received broadcast frequency of the first broadcast transmission region in the checked second broadcast transmission region with reference to the broadcast frequency table for each broadcast transmission region; And receiving a tune tuned to a broadcast frequency of the second broadcast coverage region.