KR20000031774A - Television for vehicle containing diversity antenna - Google Patents
Television for vehicle containing diversity antenna Download PDFInfo
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- KR20000031774A KR20000031774A KR1019980047986A KR19980047986A KR20000031774A KR 20000031774 A KR20000031774 A KR 20000031774A KR 1019980047986 A KR1019980047986 A KR 1019980047986A KR 19980047986 A KR19980047986 A KR 19980047986A KR 20000031774 A KR20000031774 A KR 20000031774A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radio Transmission System (AREA)
Abstract
Description
본 발명은 자동차에 설치되는 차량용 텔레비젼에 관한 것으로, 보다 상세하게는 서로 다른 방향으로 설치되는 둘 이상의 안테나를 구비하고 그 안테나중 신호수신특성이 가장 좋은 안테나를 통해 신호를 수신받는 다이버시티 안테나를 구비한 차량용 텔레비젼에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle television installed in an automobile, and more particularly, includes a diversity antenna having two or more antennas installed in different directions and receiving a signal through an antenna having the best signal reception characteristics among the antennas. It relates to a car television.
도1은 종래의 차량용 텔레비젼의 회로구성을 간략하게 도시한 블록구성도로서, 차량의 외부에 부착설치되는 안테나(ANT)와, 상기 안테나(ANT)를 통해 선택채널의 반송주파수를 수신하여 중간주파수로 변환하는 튜너(11)와, 상기 튜너(11)의 출력단에 구비되며 중간주파수 대역통과특성을 갖는 쏘필터(12)와, 상기 쏘필터(12)를 통해 인접채널 및 노이즈가 제거된 중간주파수를 소정 레벨로 증폭하는 증폭부(13)와, 상기 증폭부(13)로부터 출력되는 중간주파수에서 영상중간주파수와 음성중간주파수를 찾기위한 기준주파수를 검출하는 검출부(14)와, 상기 검출부(14)로부터 출력되는 중간주파수중 검출된 기준주파수에 따라 영상중간주파수를 복조하여 베이스밴드의 영상신호로 변환하는 비디오복조부(16)와, 상기 검출부(14)로부터 출력되는 중간주파수중 검출된 기준주파수에 따라 음성중간주파수를 복조하여 베이스밴드의 음성신호로 변환하는 오디오복조부(17)를 포함한다.1 is a block diagram schematically illustrating a circuit configuration of a conventional vehicle television. An antenna ANT attached to an outside of a vehicle and an intermediate frequency by receiving a carrier frequency of a selected channel through the antenna ANT are shown in FIG. A tuner 11 for converting to a?, An output terminal of the tuner 11, a saw filter 12 having an intermediate frequency band pass characteristic, and an intermediate frequency from which adjacent channels and noise are removed through the saw filter 12; Amplification unit 13 for amplifying the signal to a predetermined level, a detection unit 14 for detecting a reference frequency for searching for an image intermediate frequency and an audio intermediate frequency at an intermediate frequency output from the amplifying unit 13, and the detection unit 14 The video demodulator 16 demodulates the video intermediate frequency according to the detected reference frequency among the intermediate frequencies output from the N-D, and converts the video intermediate frequency into a video signal of the baseband. And an audio demodulation unit 17 for demodulating the intermediate voice frequency according to the reference frequency and converting the voice intermediate frequency into a baseband voice signal.
이렇게, 차량에 부착되는 텔레비젼도 어느 한 장소에 고정설치되는 일반적인 텔레비젼과 마찬가지로 구성되어있으며, 단지 가정용 텔레비젼와는 달리 수신감도가 더 좋은 안테나를 사용한다는 점에 차이가 있다.In this way, the television attached to the vehicle is configured like a general television fixedly installed in any one place, and there is a difference in that an antenna having better reception sensitivity is used, unlike a home television.
그런데, 차량용 텔레비젼은 가정용 텔레비젼과는 달리 자동차에 설치되어 수신지역이 계속 변하게 되기 때문에, 아무리 좋은 안테나를 설치한다고 하더라도 이동지역에 따라 수신특성이 달라진다는 문제점이 있으며, 심한 경우에는 수신특성이 아주 나빠 시청이 불가능해지기도 한다.However, since a television for a vehicle is installed in a car and unlike a home television, the reception area is continuously changed, even if a good antenna is installed, the reception characteristics are different depending on the moving area. In severe cases, the reception characteristics are very bad. You may not be able to watch.
따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로서, 그 목적은 수신방향이 서로 다른 둘이상의 안테나를 설치하고, 설치된 안테나중 수신특성이 가장 좋은 안테나를 선택하여 동작하며 시청중에도 노이즈레벨이 일정치 이상이 되면 수신특성이 더 좋은 안테나로 계속 변경하여 항상 소정 정도이상의 수신특성을 유지할 수 있도록 하는 다이버시티 안테나를 구비한 차량용 텔레비젼을 제공하는데 있다.Accordingly, the present invention has been made to solve the above-mentioned problems, the object of the present invention is to install two or more antennas with different reception directions, and to operate by selecting the antenna having the best reception characteristics among the installed antennas SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle television equipped with a diversity antenna that continuously changes to an antenna having better reception characteristics when the noise level becomes higher than a predetermined value so that the reception characteristics can always be maintained at a predetermined level or more.
도1은 종래의 차량용 텔레비젼을 도시한 블록구성도이다.1 is a block diagram showing a conventional vehicle television.
도2는 본 발명에 의한 차량용 텔레비젼을 도시한 블록구성도이다.Fig. 2 is a block diagram showing a vehicle television according to the present invention.
도3은 도2에서 마이콤의 동작을 보이는 플로우챠트이다.3 is a flowchart showing the operation of the microcomputer in FIG.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
ANT1∼ANT4 : 제1안테나∼제4안테나ANT1-ANT4: 1st antenna-4th antenna
21 : 안테나스위칭부 22 : 튜너21: antenna switching unit 22: tuner
23 : 쏘필터 24 : 증폭부23: saw filter 24: amplification unit
25 : 검출부 26 : 비디오복조부25 detection unit 26 video demodulation unit
27 : 오디오복조부 28 : 레벨검출부27: audio demodulator 28: level detector
29 : 동기신호분리부 30 : 노이즈증폭부29: synchronization signal separator 30: noise amplifier
31 : 노이즈비교부 32 : 마이콤31: noise comparison unit 32: micom
33 : 스위칭구동부33: switching driver
상술한 본 발명의 목적을 달성하기 위한 구성수단으로서, 본 발명은 튜너와, 쏘필터와, 증폭부와, 검출부와, 비디오/오디오복조부를 포함하는 차량용 텔레비젼에 있어서,As a constituent means for achieving the above object of the present invention, the present invention provides a vehicle television comprising a tuner, a saw filter, an amplifier, a detector, and a video / audio demodulator,
서로 다른 수신방향으로 설치되는 둘 이상의 안테나와,Two or more antennas installed in different receiving directions,
상기 둘이상의 안테나중 하나를 선택하여 상기 튜너의 입력단에 연결하는 안테나스위칭부와,An antenna switching unit which selects one of the two or more antennas and connects it to an input of the tuner;
상기 검출부의 중간주파수의 레벨을 검출하여 직류전압으로 나타내는 레벨검출부와,A level detector for detecting the level of the intermediate frequency of the detector and indicating the DC voltage;
상기 비디오복조부로부터 출력되는 영상신호에서 수평동기신호를 검출하는 동기신호분리부와,A sync signal separator for detecting a horizontal sync signal from the video signal output from the video demodulator;
상기 복조된 영상신호에 포함된 노이즈신호를 증폭하는 노이즈증폭부와,A noise amplifier for amplifying a noise signal included in the demodulated video signal;
상기 노이즈증폭부로부터 출력되는 노이즈신호가 영상신호에 영향을 미치지 않은 최대 노이즈레벨기준값보다 큰지를 비교하는 노이즈비교부와,A noise comparing unit for comparing whether the noise signal output from the noise amplifying unit is larger than a maximum noise level reference value that does not affect the video signal;
상기 안테나스위칭부를 제어하여 둘이상의 안테나를 차례로 선택하면서, 상기 동기신호분리부로부터 수평동기신호가 입력되고 노이즈비교부로부터 수신신호의 노이즈레벨이 기준레벨보다 크지안다는 신호가 인가된 안테나의 레벨검출부 출력값을 저장한 후, 레벨검출부의 출력값이 가장높은 안테나로 고정되도록 마이콤을 포함하는 것을 특징으로 한다.The level detecting unit of the antenna to which the horizontal switching signal is input from the synchronization signal separating unit, and the signal is received from the noise comparing unit that the noise level of the received signal is not greater than the reference level while controlling the antenna switching unit. After storing the output value, the output value of the level detector is characterized in that it comprises a micom to be fixed to the highest antenna.
이하, 첨부한 도2의 블록구성도와 도3의 플로우챠트를 참조하여 본 발명을 설명한다.Hereinafter, the present invention will be described with reference to the block diagram of FIG. 2 and the flowchart of FIG. 3.
본 발명에 의한 차량용 텔레비젼은 도2에 도시한 바와 같이, 서로 다른 수신방향을 갖도록 설치되는 둘 이상의 안테나(본 실시예에서는 네 개의 안테나를 설치한다), 즉, 제1안테나∼제4안테나(ANT1∼ANT4)와, 상기 제1안테나∼제4안테나(ANT1~ANT4)중 하나를 선택하여 튜너(22)에 연결하는 안테나스위칭부(21)와, 상기 안테나스위칭부(21)를 통해 연결된 안테나(ANT1∼ANT4 중 하나)를 통하여 시청자가 선택한 채널의 반송주파수를 수신하여 중간주파수로 변환하는 튜너(22)와, 상기 튜너(22)의 출력단에 구비되며 중간주파수 대역통과특성을 갖는 쏘필터(23)와, 상기 쏘필터(23)를 통해 인접채널 및 노이즈가 제거된 중간주파수를 소정 레벨로 증폭하는 증폭부(24)와, 상기 증폭부(24)로부터 출력되는 중간주파수에서 영상중간주파수와 음성중간주파수를 찾기위한 기준주파수를 검출하는 검출부(25)와, 상기 검출부(25)로부터 출력되는 중간주파수중 검출된 기준주파수에 따라 영상중간주파수를 복조하여 베이스밴드의 영상신호로 변환하는 비디오복조부(26)와, 상기 검출부(25)로부터 출력되는 중간주파수중 검출된 기준주파수에 따라 음성중간주파수를 복조하여 베이스밴드의 음성신호로 변환하는 오디오복조부(27)와, 상기 검출부(25)를 통해 중간주파수의 레벨을 검출하여 직류전압으로 변환출력하는 레벨검출부(28)와, 상기 비디오복조부(26)로부터 출력되는 영상신호에서 수평동기신호를 분리하여 출력하는 동기신호분리부(29)와, 영상신호에 포함된 노이즈를 분리증폭하는 노이즈증폭부(30)와, 상기 노이즈증폭부(30)로부터 출력되는 노이즈신호를 콘덴서(C)에 의해 설정되는 노이즈레벨기준값보다 큰지를 비교하여 그 결과를 출력하는 노이즈비교부(31)와, 초기동작시 상기 제1∼제4안테나(ANT1∼ANT4)가 순차적으로 튜너(22)에 연결되도록 제어신호를 출력하면서 각 안테나를 통해 수신된 신호에 대해 동기신호분리부(29)로부터 수평동기신호가 인가되고 노이즈비교부(31)로부터 수신신호에 포함된 레벨이 기준레벨보다 작다는 신호가 인가되면 레벨검출부(28)에 의해 검출된 신호레벨을 나타내는 직류값을 기억하는 안테나검색동작을 실행하여 최대 직류값을 갖는 안테나(ANT1∼ANT4)가 튜너(22)에 고정연결되도록 제어하며, 안테나가 고정된 후에도 수신신호의 노이즈레벨이 기준레벨보다 크다는 신호가 노이즈비교부(31)로부터 인가되면 상술한 안테나검색동작을 실행시켜 큰 레벨의 신호가 수신되는 안테나로 변경고정되도록 제어하는 마이콤(32)과, 상기 마이콤(32)의 제어에 따라서 선택된 안테나가 튜너(22)에 연결되도록 상기 안테나스위칭부(21)를 구동시키는 스위칭구동부(33)를 구비한다.As shown in FIG. 2, a vehicle television according to the present invention has two or more antennas (four antennas are provided in this embodiment) which are installed to have different receiving directions, that is, the first to fourth antennas (ANT1). ANT4), an antenna switching unit 21 for selecting one of the first antennas to the fourth antennas ANT1 to ANT4 and connecting to the tuner 22, and an antenna connected through the antenna switching unit 21 ( A tuner 22 which receives the carrier frequency of the channel selected by the viewer through ANT1 to ANT4) and converts the carrier frequency into an intermediate frequency, and a saw filter 23 provided at the output of the tuner 22 and having an intermediate frequency bandpass characteristic. ), An amplification unit 24 for amplifying the intermediate channel and the intermediate frequency from which noise is removed through the saw filter 23 to a predetermined level, and an image intermediate frequency and audio at the intermediate frequency output from the amplifying unit 24. Reference note for finding intermediate frequencies A detector 25 for detecting a number, a video demodulator 26 for demodulating the video intermediate frequency according to the detected reference frequency among the intermediate frequencies output from the detector 25, and converting the video intermediate frequency into a baseband video signal; The audio demodulator 27 demodulates the voice intermediate frequency according to the detected reference frequency among the intermediate frequencies output from the detector 25 and converts the voice intermediate frequency into a voice signal of the baseband, and the level of the intermediate frequency through the detector 25. A level detector 28 for detecting and converting the signal into a DC voltage, a sync signal separator 29 for separating and outputting a horizontal sync signal from the video signal output from the video demodulator 26, and a video signal included in the video signal. The noise amplification section 30 for separately amplifying the noise and the noise signal output from the noise amplification section 30 are compared with a noise level reference value set by the capacitor C. For the signals received through each antenna while outputting a control signal so that the noise comparator 31 for outputting the control signal and the first to fourth antennas ANT1 to ANT4 are sequentially connected to the tuner 22 during the initial operation. When the horizontal synchronization signal is applied from the synchronization signal separator 29 and the signal from the noise comparator 31 is applied that the level included in the received signal is smaller than the reference level, it indicates the signal level detected by the level detector 28. Performs an antenna search operation to store the DC value so that the antennas ANT1 to ANT4 having the maximum DC value are fixedly connected to the tuner 22, and the signal that the noise level of the received signal is greater than the reference level even after the antenna is fixed. Is applied from the noise comparator 31 to perform the above-described antenna search operation so as to change and fix the high level signal to the received antenna, and to control the microcom 32. That is because the selected antenna connected to the tuner 22, and a switching driving unit 33 for driving the antenna switching unit 21.
이러한 구성을 갖는 본 발명에 의한 차량용 텔레비젼의 동작은 도3의 플로우챠트에 도시한 바와 같이 이루어지는데, 먼저, 텔레비젼의 전원이 온되면(201), 초기화동작으로 안테나스위칭부(21)가 제1안테나(ANT1)를 튜너(22)에 연결하도록 스위칭구동부(33)를 제어한다(302). 이렇게, 제1안테나(ANT1)가 튜너(22)에 연결되어 수신동작이 이루어지면, 동기신호분리부(29)로부터 수평동기신호가 인가되는지를 체크한다(303). 여기에서, 수평동기신호가 입력되었다면 선택된 안테나로 방송신호가 수신되고 있는 상태이므로, 다음 단계로 진행하여 노이즈비교부(31)로부터 수신신호의 노이즈레벨이 기준값보다 크지않다는 신호가 인가되는지를 체크한다(304). 상기에서, 기준값은 영상신호에 큰 영향을 미칠 수 없는 노이즈레벨의 최고치로서, 상기 기준값보다 수신신호의 노이즈레벨이 크다면 노이즈영향으로 시청자는 선명한 영상볼 수 없는 것으로, 시청이 불가능한 정도를 말한다. 여기에서, 입력되는 수평동기신호가 없거나 수신신호의 노이즈레벨이 기준값보다 높으면 시청불가능한 정도로 나쁜 상태이므로 그냥, 튜너(22)로 연결되는 안테나를 다음 안테나(즉, 제2안테나(ANT2)로 변경하여 상기 단계(303)부터 반복한다.The operation of the vehicular television according to the present invention having such a configuration is performed as shown in the flowchart of FIG. 3. First, when the power supply of the television is turned on (201), the antenna switching unit 21 performs the first operation by the initialization operation. The switching driver 33 is controlled to connect the antenna ANT1 to the tuner 22 (302). When the first antenna ANT1 is connected to the tuner 22 and the reception operation is performed, it is checked whether the horizontal synchronization signal is applied from the synchronization signal separator 29 (303). Here, if the horizontal synchronization signal is input, since the broadcast signal is being received by the selected antenna, it proceeds to the next step and checks whether the signal from the noise comparator 31 that the noise level of the received signal is not greater than the reference value is applied. 304. In the above description, the reference value is a maximum value of a noise level that does not significantly affect the video signal. If the noise level of the received signal is greater than the reference value, the reference value means that the viewer cannot see a clear image due to the noise effect, and the degree of viewing is impossible. In this case, if there is no horizontal synchronization signal input or the noise level of the received signal is higher than the reference value, it is in a bad state that cannot be viewed. Just change the antenna connected to the tuner 22 to the next antenna (that is, the second antenna ANT2). Repeat from step 303 above.
그리고, 상기에서 수평동기신호가 입력되고, 수신신호의 노이즈레벨이 기준값보다 작을 때, 레벨검출부(28)로부터 출력되는 수신신호의 크기를 나타내는 직류(DC)값과 선택된 안테나(즉, ANT1)를 저장시킨다(305). 그리고, 현재 선택된 안테나가 마지막 안테나인 제4안테나(ANT4)인지를 체크하여(306), 제4안테나(ANT4)가 아니라면, 튜너(22)에 연결되는 안테나를 다음 안테나, 즉 제2안테나(ANT2)로 변경한 후 상기 단계303부터 반복한다.When the horizontal synchronous signal is input and the noise level of the received signal is smaller than the reference value, a direct current (DC) value indicating the magnitude of the received signal output from the level detector 28 and the selected antenna (ie, ANT1) are selected. Save (305). In operation 306, if the currently selected antenna is the fourth antenna ANT4, which is the last antenna, and if it is not the fourth antenna ANT4, the antenna connected to the tuner 22 is the next antenna, that is, the second antenna ANT2. ), And then repeat from step 303.
상기와 같은 안테나 수신특성 검색동작을 반복하여 마지막 안테나인 제4안테나(ANT4)까지 완료하면(306), 저장된 각 안테나의 신호레벨을 나타내는 DC값들을 비교하여, 가장 큰 DC값이 나타난 안테나가 튜너(22)에 연결되도록 고정시킨다(308). 따라서, 네 안테나(ANT1∼ANT4)중 가장 수신감도가 좋은 안테나를 통해 방송신호를 수신함으로서, 시청자는 움직이는 차안에서도 보다 좋은 화질로 방송시청이 가능하게 된다.When the antenna reception characteristic search operation is repeated to the fourth antenna ANT4 which is the last antenna (306), the antennas having the largest DC value are compared by comparing the DC values representing the signal levels of the stored antennas. Secure to be connected to (22) (308). Accordingly, by receiving the broadcast signal through the antenna having the best reception sensitivity among the four antennas ANT1 to ANT4, the viewer can watch the broadcast with better image quality even in a moving car.
그리고, 상기와 같이 가장 수신감도가 좋은 안테나로 선택연결된 상태에서도, 텔레비젼의 전원이 오프될 때까지(309), 현재 수신신호에 포함된 노이즈레벨이 기준값보다 큰지를 노이즈비교부(31)의 출력신호를 체크함에 의해 판단하여 수신신호의 노이즈레벨이 기준값보다 커지면, 상기 각 안테나의 수신특성을 검색하는 과정(단계302∼308)을 재 실행하여 좀더 수신특성이 좋은 안테나를 선택한다.In addition, even when the antenna is selectively connected to the antenna having the best reception sensitivity as described above, the output of the noise comparator 31 indicates whether the noise level included in the current reception signal is greater than the reference value until the power of the television is turned off (309). If it is determined by checking the signal and the noise level of the received signal is larger than the reference value, the process of searching for the reception characteristic of each antenna (steps 302 to 308) is repeated to select an antenna having better reception characteristics.
이와같이, 본 발명에 의한 차량용 텔레비젼은 수신방향이 다른 여러개의 안테나를 구비하고, 수신신호의 크기를 이용하여 수신특성이 가장 좋은 안테나를 이용하여 수신하고, 시청도중에도 수신신호에 포함된 노이즈레벨을 체크하여 노이즈레벨이 기준값보다 커질 때는 다른 안테나중 수신특성이 좋은 안테나에 변경연결시킴으로서, 움직이는 차량에서도 항상 좋은 감도로 방송신호를 수신하여 시청자가 더 좋은 화질로 시청할 수 있게 하는 우수한 효과가 있다.As described above, the vehicle television according to the present invention includes a plurality of antennas having different reception directions, receives using the antenna having the best reception characteristics using the size of the received signal, and receives the noise level included in the received signal even during viewing. When the noise level is larger than the reference value by checking, the antenna is changed and connected to the antenna having good reception characteristics, so that even a moving vehicle always receives a broadcast signal with good sensitivity so that the viewer can watch with better image quality.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980047986A KR20000031774A (en) | 1998-11-10 | 1998-11-10 | Television for vehicle containing diversity antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980047986A KR20000031774A (en) | 1998-11-10 | 1998-11-10 | Television for vehicle containing diversity antenna |
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| Publication Number | Publication Date |
|---|---|
| KR20000031774A true KR20000031774A (en) | 2000-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019980047986A KR20000031774A (en) | 1998-11-10 | 1998-11-10 | Television for vehicle containing diversity antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100496684B1 (en) * | 2002-09-11 | 2005-06-22 | 현대모비스 주식회사 | Car TV with diversity antenna circuit |
| KR100659623B1 (en) * | 2003-09-29 | 2006-12-20 | 산요덴키가부시키가이샤 | Reception apparatus |
-
1998
- 1998-11-10 KR KR1019980047986A patent/KR20000031774A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100496684B1 (en) * | 2002-09-11 | 2005-06-22 | 현대모비스 주식회사 | Car TV with diversity antenna circuit |
| KR100659623B1 (en) * | 2003-09-29 | 2006-12-20 | 산요덴키가부시키가이샤 | Reception apparatus |
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