KR20010064717A - Apparatus for controlling low noise amplifier of TV receiver - Google Patents

Apparatus for controlling low noise amplifier of TV receiver Download PDF

Info

Publication number
KR20010064717A
KR20010064717A KR1019990058989A KR19990058989A KR20010064717A KR 20010064717 A KR20010064717 A KR 20010064717A KR 1019990058989 A KR1019990058989 A KR 1019990058989A KR 19990058989 A KR19990058989 A KR 19990058989A KR 20010064717 A KR20010064717 A KR 20010064717A
Authority
KR
South Korea
Prior art keywords
signal
noise
tuner
low noise
noise amplifier
Prior art date
Application number
KR1019990058989A
Other languages
Korean (ko)
Inventor
신종환
Original Assignee
구자홍
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 구자홍, 엘지전자 주식회사 filed Critical 구자홍
Priority to KR1019990058989A priority Critical patent/KR20010064717A/en
Publication of KR20010064717A publication Critical patent/KR20010064717A/en

Links

Classifications

    • 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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • 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
    • H04N5/52—Automatic gain control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE: A low noise amplifier control device in TV set is provided to simplify a circuit and prevent a mixture of signals in receiving a broadcasting of other channel by detecting noise quantity of a weak field signal and operating a low noise amplifier in case a broadcasting signal received at an antenna is the weak field signal. CONSTITUTION: A tuner(10) selects a broadcasting high frequency signal received at an antenna and processes the signal in an intermediate frequency. An image detection unit(11) detects the intermediate frequency signal output from the tuner(10). An A/D(analog/digital) converting unit(12) converts the detected image signal into a digital signal. A noise detection unit(13) detects noise quantity of the image signal converted into digital. An image processing unit(14) processes image output in case the noise quantity is normal in result of the detection of the noise detection unit(13). A micom(15) compares the noise quantity detected in the noise detection unit(13) with an appointed specific value and drives a low noise amplifier(10A) in the tuner(10) in case the noise quantity is high. The low noise amplifier(10A) amplifies a weak field signal to a degree over the specific value when the signal selected in the tuner(10) by the control signal of the micom(15) is the weak field signal.

Description

티브이수상기에서의 저소음증폭기(ＬＮＡ)제어장치{Apparatus for controlling low noise amplifier of TV receiver}Apparatus for controlling low noise amplifier of TV receiver

본 발명은 티브이수상기에 약전계신호가 입력될 때 자동이득제어신호에 의해 저소음증폭(LNA;Low Noise Amplifier)기가 동작하므로서 상기 입력된 약전계신호를 임의의 세기로 증폭하여 보다 선명한 영상을 사용가가 시청할 수 있도록 한 티브이수상기에서의 저소음증폭제어장치에 관한 것이다.According to the present invention, a low noise amplifier (LNA) is operated by an automatic gain control signal when a weak field signal is input to a TV receiver, thereby amplifying the weak field signal to an arbitrary intensity so that a user can watch a clearer image. It relates to a low noise amplification control device in a TV receiver.

종래 티브이수상기의 저소음증폭장치는 도 1에 도시된 바와 같이, 안테나에 수신된 방송 고주파신호의 세기에 해당하는 자동이득제어(AGC)전압을 검파하여 이를 자동이득검파부(2)에 인가하는 튜너(1)와, 상기 튜너(1)내에 위치하여 안테나에수신된 방송 고주파신호가 약전계일 때 이를 증폭하여 출력하는 저소음증폭기(1-1)와, 상기 튜너(1)에서 출력된 자동이득제어전압을 검출하여 마이컴에 인가하는 자동이득검파부(2)와, 상기 자동이득검파부(2)에서 검파된 자동이득제어전압를 입력받아 설정된 전압과 비교하여 비교결과에 의해 스위칭부(4)를 제어하는 마이컴(3)과, 상기 마이컴(3)의 비교결과에 의해 튜너(1)에 위치한 저소음증폭기(1-1)가 동작하도록 온/오프작동하는 스위칭부(4)로 구성된 것이다.As shown in FIG. 1, a conventional low noise amplifier of a TV receiver detects an automatic gain control (AGC) voltage corresponding to the strength of a broadcast high frequency signal received by an antenna and applies the same to the automatic gain detector 2. (1), a low noise amplifier (1-1) located in the tuner (1) for amplifying and outputting a broadcast high frequency signal received by an antenna when it is a weak electric field, and automatic gain control output from the tuner (1). The auto gain detector 2 which detects the voltage and applies it to the microcomputer and the auto gain control voltage detected by the auto gain detector 2 are inputted and compared with the set voltage to control the switching unit 4 by the comparison result. The microcomputer 3 and the switching unit 4 which is turned on / off to operate the low noise amplifier 1-1 located in the tuner 1 according to the comparison result of the microcomputer 3.

한편, 도 2는 종래 티브이수상기의 저소음증폭기의 제어과정을 보인 플로우챠트로서, 안테나에 수신된 고주파신호의 자동이득제어전압을 검출하는 단계와, 상기 검출된 자동이득제어전압과 설정된 전압을 비교하는 단계와, 비교결과 입력된 신호가 설정된 전압보다 작을 경우 약전계신호로 판단하여 저소음증폭기를 구동시켜 입력된 약전계신호를 임의의 세기로 증폭하여 선명한 영상을 출력하는 단계와, 상기 비교결과 입력된 신호가 설정된 전압보다 클 경우 정상적인 신호로 판단하여 영상을 출력하는 단계로 이루어진 것이다.2 is a flowchart illustrating a control process of a low noise amplifier of a conventional TV receiver, the method including detecting an automatic gain control voltage of a high frequency signal received by an antenna, and comparing the detected automatic gain control voltage with a set voltage. And if the input signal is smaller than the set voltage as a result of the comparison, determining that the weak electric field signal is driving a low noise amplifier to amplify the input weak electric field signal to an arbitrary intensity and output a clear image; If is greater than the set voltage is determined to be a normal signal and consists of the step of outputting the image.

이와 같이 구성된 종래 티브이수상기의 저소음증폭장치는 도 1과 도 2를 참조하여 설명하면 다음과 같다.The low noise amplifier of the conventional TV receiver configured as described above will be described with reference to FIGS. 1 and 2.

안테나에 방송신호가 수신되면 튜너(1)는 수신된 신호에서 방송신호를 선국하게 되는 바, 상기 튜너(1)는 수신된 방송신호를 통해 고주파신호의 세기에 해당하는 자동이득제어전압을 출력하게 된다.When the broadcast signal is received by the antenna, the tuner 1 tunes the broadcast signal from the received signal, and the tuner 1 outputs an automatic gain control voltage corresponding to the strength of the high frequency signal through the received broadcast signal. do.

이때, 튜너(1)에서 자동이득제어전압이 출력되면 자동이득전압검출부(2)는 출력된 자동이득제어전압을 검출하여 마이컴(3)에 인가한다.At this time, when the automatic gain control voltage is output from the tuner 1, the automatic gain voltage detection unit 2 detects the output automatic gain control voltage and applies it to the microcomputer 3.

따라서, 마이컴(3)은 자동이득전압검출부(2)에서 검출된 자동이득제어전압을 입력받아 설정된 전압과 비교하여 스위칭부(4)를 온/오프제어하므로서 튜너(1)내의 저소음증폭기(1-1)를 구동시키게 된다.Accordingly, the microcomputer 3 receives the automatic gain control voltage detected by the automatic gain voltage detector 2 and compares the voltage with the set voltage to control the switching unit 4 on / off, thereby reducing the low noise amplifier 1 in the tuner 1. Will drive 1).

즉, 튜너(1)내의 저소음증폭기(1-1)는 안테나에 약전계의 신호가 입력될 때 동작하기 위한 것으로, 상기 약전계는 기준전계인 고주파전계 강도가 특정전계이하일 경우를 약전계로 정의하게 되므로, 안테나에 수신된 방송신호의 고주파전계강도가 특정전계이하일 경우 튜너(1)에서 출력되는 자동이득전압이 상승시켜야 한다.That is, the low noise amplifier 1-1 in the tuner 1 is operated when a signal of a weak electric field is input to the antenna, and the weak electric field is defined as a weak electric field when the high frequency electric field strength, which is a reference electric field, is equal to or less than a specific electric field. Therefore, when the high frequency field strength of the broadcast signal received by the antenna is less than a specific electric field, the automatic gain voltage output from the tuner 1 should be increased.

따라서, 마이컴(3)은 자동이득전압검출부(2)에서 검출된 자동이득전압을 설정된 전압과 비교하여 자동이득전압이 낮을 경우 스위칭부(4)를 통해 튜너(1)내의 저소음증폭기(1-1)를 동작시켜 안테나를 통해 입력되는 약전계신호를 특정전압 이상이 될 때 까지 증폭출력하게 되고, 상기 마이컴(3)의 비교결과 검출된 자동이득전압이 설정된 전압보다 높을 경우 정상적인 신호가 안테나에 수신된 것이므로 튜너(1)내의 저소음증폭기(1-1)가 오프된 상태에서 영상이 화면에 디스플레이된다.Therefore, the microcomputer 3 compares the auto gain voltage detected by the auto gain voltage detector 2 with the set voltage, and when the auto gain voltage is low, the low noise amplifier 1-1 in the tuner 1 through the switching unit 4. ) To amplify and output the weak electric field signal inputted through the antenna until it reaches a specific voltage or more, and when the auto gain voltage detected as a result of the comparison of the microcomputer 3 is higher than the set voltage, a normal signal is received by the antenna. Since the low noise amplifier 1-1 in the tuner 1 is turned off, the image is displayed on the screen.

그러나 종래에는 튜너에서 출력되는 자동이득전압을 검출한후 상기 검출결과에 의해 튜너내의 저소음증폭기를 동작시키기 위해 마이컴과 튜너의 전원을 연결해야 하므로서 회로가 복잡하고, 상기 마이컴의 디지탈노이즈가 튜너에 직접 유기되어 영상신호를 복조할 때 디지탈노이즈가 같이 복조되어 영상에 노이즈가 형성되고, 또한 자동이득전압을 검출하여 저소음증폭기를 동작시킬 때 신호의 노이즈양에 관계없이 저소음증폭기가 동작하므로서 정상적인 신호로 증폭하기 때문에 다른 채널의 영상신호에 영향을 미쳐 혼신이 발생하게 되는 문제점이 있었다.However, in the related art, the circuit is complicated by detecting the auto gain voltage output from the tuner and connecting the microcomputer and the tuner to operate the low noise amplifier in the tuner according to the detection result, and the digital noise of the microcomputer is directly connected to the tuner. When the demodulated video signal is demodulated, the digital noise is demodulated together to form noise in the video, and when the automatic gain voltage is detected to operate the low noise amplifier, the low noise amplifier operates regardless of the amount of noise in the signal, thereby amplifying the signal into a normal signal. Therefore, there is a problem that interference occurs due to the video signal of the other channel.

본 발명은 이와 같은 종래의 문제점을 해결하기 위하여 안테나에 수신된 방송신호가 약전계신호일 때 상기 약전계신호의 노이즈양을 검출하여 노이즈양에 따라 저소음증폭기를 동작시키므로서 회로의 간단화 및 다른채널의 방송을 수신할 때 혼신을 방지하도록 한 것으로, 첨부된 도면에 의하여 본 발며의 구성 및 작용효과를 설명하면 다음과 같다.In order to solve such a conventional problem, the present invention detects the amount of noise of the weak field signal when the broadcast signal received by the antenna is a weak field signal, and operates a low noise amplifier according to the amount of noise. In order to prevent interference when receiving a broadcast, the configuration and effect of the present invention will be described with reference to the accompanying drawings.

도 1은 종래 티브이수상기의 저소음증폭장치 구조를 보인 블록도.1 is a block diagram showing a low noise amplifier structure of a conventional TV receiver.

도 2는 종래 티브이수상기의 저소음증폭장치의 제어과정을 보인 플로우챠트.Figure 2 is a flow chart showing a control process of the low noise amplifier of the conventional TV receiver.

도 3은 본 발명 티브이수상기의 저소음증폭제어장치 구조를 보인 블록도.Figure 3 is a block diagram showing the structure of a low noise amplification control device of the present invention TV receiver.

도 4는 본 발명 티브이수상기의 저소음증폭제어장치의 제어과정을 보인 플로우챠트.Figure 4 is a flow chart showing a control process of the low noise amplification control device of the present invention TV receiver.

먼저, 본 발명 티브이수상기에서의 저소음증폭(LNA)제어장치는 도 3에 도시된 바와 같이, 안테나에 수신된 방송고주파신호를 입력받아 이를 선국하여 중간주파수처리하여 출력하는 튜너(10)와, 튜너(10)에서 선국되어 출력된 방송 중간주파수신호를 입력받아 이를 검파하여 출력하는 영상검파부(11)와, 검파출력된 영상신호를 디지탈신호로 변환출력하는 A/D변환부(12)와, 디지탈변환된 영상신호를 입력받아 노이즈량을 검출하는 노이즈검출부(13)와, 상기 노이즈검출부(13)의 검출결과 노이즈량이 정상적일 때 영상이 출력되도록 처리하는 영상처리부(14)와, 상기 노이즈검출부(13)에서 검출된 노이즈량을 입력받아 설정된 특정치와 비교하여 노이즈량이 많을 경우 튜너(10)내부의 저소음증폭기(10A)를 구동제어하는 마이컴(15)과, 상기 마이컴(15)의 제어신호에 의해 튜너(10)에 선국된 신호가 약전계신호일 때 상기 입력된 약전계신호를 특정치 이상이 되도록 증폭출력하는 저소음증폭기(10A)로 구성된 것이다.First, the low noise amplification (LNA) control apparatus of the present invention TV receiver, as shown in Figure 3, the tuner 10 to receive the broadcast high-frequency signal received by the antenna and tune it and output the intermediate frequency processing, the tuner An image detector 11 for receiving a broadcast intermediate frequency signal selected and outputted at 10 and detecting and outputting the broadcast intermediate frequency signal, and an A / D converter 12 for converting and outputting the detected output image signal into a digital signal; A noise detector 13 for detecting the amount of noise by receiving the digitally converted image signal, an image processor 14 for processing the image to be output when the noise level is normal as a result of the detection of the noise detector 13, and the noise detector The microcomputer 15 for driving control of the low noise amplifier 10A inside the tuner 10 and the control signal of the microcomputer 15 when the amount of noise is large compared to the specific value set by receiving the amount of noise detected in (13). On When it tuner 10 is tuned to the foil who signal KP is composed of the users who enjoy the input Pharmacopoeia No. noise amplifier (10A) for amplifying the output is at least a certain value.

한편, 도 4는 본 발명의 제어과정을 보인 플로우챠트로서, 디지탈처리된 영상신호를 입력받아 노이즈량을 검출하는 제 1단계와, 상기 검출된 노이즈량과 설정된 특정치를 비교하여 튜너내부의 저소음증폭기를 구동제어하는 제 2단계와, 상기 비교결과 검출된 노이즈량이 설정된 특정치 이상일 경우 저소음증폭기를 온하여 구동시키고, 노이즈량이 설정된 특정치 이하일 경우 저소음증폭기를 오프하여 선명한 영상이 출력되도록 제어하는 제 3단계로 이루어진 것이다.4 is a flowchart illustrating a control process of the present invention, in which a first step of detecting a noise amount by receiving a digitally processed image signal and comparing the detected noise amount with a specific value set are low noise amplifiers inside the tuner. A second step of driving control; and a third step of controlling to output a clear image by turning on the low noise amplifier when the amount of detected noise is greater than or equal to a predetermined value, and by turning off the low noise amplifier when the amount of noise is less than or equal to a predetermined value. It is made up of steps.

이와 같이 구성된 본 발명의 작용효과는 도 3과 도 4에 도시된 바와 같이, 안테나에 방송고주파신호가 수신되면 튜너(10)는 수신된 방송고주파신호를 입력받아 이를 중간주파수처리하여 영상검파부(11)에 인가한다.3 and 4, when the broadcast high frequency signal is received by the antenna, the tuner 10 receives the received broadcast high frequency signal and processes the intermediate frequency thereof to detect the image. 11).

상기 영상검파부(11)는 튜너(10)에서 중간주파수처리된 신호를 입력받아 영상신호를 검파하여 이를 A/D변환부(12)에 인가하므로서, 상기 A/D변환부(12)는 입력된 영상신호를 디지탈신호로 변환하여 노이즈검출부(13)에 인가하게 된다.The image detector 11 receives an intermediate frequency processed signal from the tuner 10, detects an image signal, and applies the signal to the A / D converter 12, thereby inputting the A / D converter 12. The converted video signal is converted into a digital signal and applied to the noise detector 13.

따라서, 노이즈검출부(13)는 A/D변환부(12)에서 변환출력된 디지탈 영상신호를 입력받아 노이즈 량을 검출여 마이컴(15)에 인가한다.Therefore, the noise detector 13 receives the digital video signal converted from the A / D converter 12 and detects the amount of noise and applies it to the microcomputer 15.

즉, 약전계신호에서의 노이즈는 화이트 픽크 형태로 존재하게 되므로 화이트 레벨보다 큰 신호이다.That is, since the noise in the weak field signal exists in the form of a white peak, the signal is larger than the white level.

이와 같이, 노이즈검출부(13)에서 영상신호의 노이즈량을 검출하였으면 마이컴(15)은 I2C버스 라인을 통해 상기 노이즈검출부(13)에서 검출된 노이즈량을 입력받아 설정된 특정치와 비교하게 된다.As such, when the noise detector 13 detects the amount of noise in the video signal, the microcomputer 15 receives the noise amount detected by the noise detector 13 through an I 2 C bus line and compares it with a predetermined value. .

비교결과, 노이즈검출부(13)에서 검출된 노이즈량이 설정된 특정치 이하일경우 입력된 영상신호는 정상적인 신호이므로 영상처리부(14)는 노이즈검출부(13)에 입력된 디지탈 영상신호를 처리하여 화면에 출력되도록 한다.As a result of the comparison, when the amount of noise detected by the noise detector 13 is less than or equal to a predetermined value, the input image signal is a normal signal, so that the image processor 14 processes the digital image signal input to the noise detector 13 and outputs it to the screen. do.

한편, 비교결과 노이즈검출부(13)에서 검출된 노이즈량이 설정된 특정치 이상일 경우 입력된 영상은 약전계신호이므로, 마이컴(15)은 I2C버스 라인을 통해 튜너(10)내부의 저소음증폭기(10A)가 동작하도록 제어신호를 출력하게 된다.On the other hand, the comparison because it is the result number, if a certain value the amount of detected noise in the noise detection unit 13 is set greater than the input image is who Pharmacopoeia, the microcomputer 15 is I 2 C bus tuner via line 10 of the internal low-noise amplifier (10A ) Will output a control signal to operate.

즉, 마이컴(15)의 제어신호에 의해 튜너(10)내부의 저소음증폭기(10A)가 온되어 튜너(10)에 입력된 약전계신호를 증폭출력하여 영상검파부(11) 및 A/D변환부(12)를 통해 노이즈검출부(13)에 인가하므로서, 상기 노이즈검출부(13)는 입력된 영상신호의 영상처리부(14)에 인가하여 영상이 출력되도록 처리하게 된다.That is, the low noise amplifier 10A inside the tuner 10 is turned on by the control signal of the microcomputer 15 to amplify and output the weak field signal inputted to the tuner 10 to convert the image detector 11 and A / D. By applying to the noise detector 13 through the unit 12, the noise detector 13 is applied to the image processor 14 of the input image signal to process the output image.

이상에서 설명한 바와 같이, 안테나에 수신된 방송신호가 약전계신호일 때 상기 수신된 약전계신호의 노이즈량을 검출한후 검출된 노이즈량에 따라 저소음증폭기를 동작시키므로서 회로의 간단화 및 다른 채널의 방송을 수신할 때 혼신을 방지할 수 있는 효과가 있다.As described above, when the broadcast signal received by the antenna is a weak field signal, after detecting the amount of noise of the received weak field signal, the low noise amplifier is operated according to the detected amount of noise to simplify the circuit and broadcast other channels. There is an effect that can prevent interference when receiving.

Claims (1)

안테나에 수신된 방송고주파신호를 입력받아 중간주파수처리하여 출력하는 튜너와, 튜너에서 처리된 중간주파수신호를 입력받아 영상신호를 검파출력하는 영상검파부와, 검파출력된 영상신호를 디지탈신호로 변환출력하는 A/D변환부와, 디지탈변환된 영상신호를 입력받아 노이즈량을 검출하는 노이즈검출부와, 영상이 출력되도록 처리하는 영상처리부와, 상기 노이즈검출부에서 검출된 노이즈량을 입력받아 설정된 특정치와 비교하여 튜너내부의 저소음증폭기를 온/오프 제어하는 마이컴과, 상기 마이컴의 제어신호에 의해 튜너에 입력된 신호가 약전계신호일 때 이를 특정치 이상 증폭출력되게 온/오프 작동하는 튜너내부에 구비된 저소음증폭기로 구성된 티브이수상기에서의 저소음증폭기(LNA)제어장치.A tuner that receives the broadcast high frequency signal received from the antenna and processes the intermediate frequency and outputs it, an image detector that receives the intermediate frequency signal processed by the tuner and detects and outputs the video signal, and converts the detected video signal into a digital signal. An A / D converter for outputting, a noise detector for detecting the amount of noise by receiving the digitally converted video signal, an image processor for processing the image to be outputted, and a specific value set by receiving the noise amount detected by the noise detector Compared with the microcomputer, the microcomputer controls the low noise amplifier on / off, and when the signal input to the tuner by the control signal of the microcomputer is a weak electric field signal, it is provided in the tuner that is turned on / off to be amplified and output above a certain value. Low noise amplifier (LNA) control device in a TV receiver consisting of a low noise amplifier.
KR1019990058989A 1999-12-18 1999-12-18 Apparatus for controlling low noise amplifier of TV receiver KR20010064717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019990058989A KR20010064717A (en) 1999-12-18 1999-12-18 Apparatus for controlling low noise amplifier of TV receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019990058989A KR20010064717A (en) 1999-12-18 1999-12-18 Apparatus for controlling low noise amplifier of TV receiver

Publications (1)

Publication Number Publication Date
KR20010064717A true KR20010064717A (en) 2001-07-11

Family

ID=19626942

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019990058989A KR20010064717A (en) 1999-12-18 1999-12-18 Apparatus for controlling low noise amplifier of TV receiver

Country Status (1)

Country Link
KR (1) KR20010064717A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030004791A (en) * 2001-07-06 2003-01-15 삼성전기주식회사 Lna built-in tuner with self control function of lna
WO2004075399A1 (en) * 2003-02-22 2004-09-02 Lg Innotek Co., Ltd Logic low noise amplifier and amplification control method thereof
KR100735918B1 (en) * 2004-12-22 2007-07-06 삼성전자주식회사 Display apparatus and method of processing image thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030004791A (en) * 2001-07-06 2003-01-15 삼성전기주식회사 Lna built-in tuner with self control function of lna
WO2004075399A1 (en) * 2003-02-22 2004-09-02 Lg Innotek Co., Ltd Logic low noise amplifier and amplification control method thereof
KR100735918B1 (en) * 2004-12-22 2007-07-06 삼성전자주식회사 Display apparatus and method of processing image thereof

Similar Documents

Publication Publication Date Title
US5034820A (en) Channel display circuit for distinguishing the existence or nonexistence of the signal at a satellite-broadcast receiver
KR20010064717A (en) Apparatus for controlling low noise amplifier of TV receiver
US20100060800A1 (en) Receiving device, reception method, and program
KR0154249B1 (en) Apparatus for video terminal auto-switching of television
JP3328926B2 (en) Television receiver
KR100774171B1 (en) Method and apparatus for controlling tuner
KR19980052942A (en) Television receiver with automatic adjustment of volume level fluctuations per channel
KR200151591Y1 (en) Automatic sound mute device of a television
KR20000060980A (en) Operation control method for low noise amplifier
KR100207711B1 (en) Apparatus for controlling low noise amplifier in using 2 tuners
KR950015101B1 (en) If processing circuit for tv receiver
KR100213484B1 (en) Automatic broadcasting mode switching method using agc
KR19980050201A (en) Volume automatic control device according to external noise level
KR930011600B1 (en) Power supply switching off method when tv receiver has no signal
KR19980050202A (en) Automatic gain adjusting device for two-tuner television receivers
KR100189354B1 (en) A volume up/down method
KR19990005994U (en) Television automatically adjusts the size of audio signals
KR100203263B1 (en) Channel automatic changing device and method
KR0172479B1 (en) Automatic sound control method by audiometry and apparatus therefor
KR20050000084A (en) Method for controlling the television of checking sound mute
KR100252617B1 (en) Television receptor
KR19980032835U (en) TV with noise reduction function of sound signal
KR200156677Y1 (en) Apparatus for preventing distortion of picture by low noise amplifier in 2-tuner recording
KR970056930A (en) Low Noise Receive Amplification Circuit of Multi-TV Display
KR970009281A (en) TV receiver with PIP function

Legal Events

Date Code Title Description
N231 Notification of change of applicant
WITN Withdrawal due to no request for examination