KR970009464B1 - Circuit for removing sound interruption of tv - Google Patents

Circuit for removing sound interruption of tv Download PDF

Info

Publication number
KR970009464B1
KR970009464B1 KR1019940003564A KR19940003564A KR970009464B1 KR 970009464 B1 KR970009464 B1 KR 970009464B1 KR 1019940003564 A KR1019940003564 A KR 1019940003564A KR 19940003564 A KR19940003564 A KR 19940003564A KR 970009464 B1 KR970009464 B1 KR 970009464B1
Authority
KR
South Korea
Prior art keywords
signal
oscillation
trap
microcomputer
intermediate frequency
Prior art date
Application number
KR1019940003564A
Other languages
Korean (ko)
Other versions
KR950026231A (en
Inventor
이정우
Original Assignee
대우전자 주식회사
배순훈
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 대우전자 주식회사, 배순훈 filed Critical 대우전자 주식회사
Priority to KR1019940003564A priority Critical patent/KR970009464B1/en
Publication of KR950026231A publication Critical patent/KR950026231A/en
Application granted granted Critical
Publication of KR970009464B1 publication Critical patent/KR970009464B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/148—Video amplifiers
    • 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
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Landscapes

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

Abstract

A circuit for removing a voice interference of a television set is disclosed. The circuit comprises a tuner(1) for selecting a broadcasting signal; an amplifier(2) for amplifying the selected broadcasting signal to a predetermined level; a microcomputer(3) for determining a broadcasting mode to provide a control signal; a digital/analog converter(4) for converting the digital control signal from the microcomputer(3) to an analog control signal; an intermediate frequency module(5) for detecting an intermediate frequency signal; a trap oscillator(6) for generating a predetermined frequency of oscillating signal; and a reducing unit(7) for reducing the output signal from the intermediate frequency module(5) according to the oscillation frequency of the trap oscillator(6).

Description

텔레비젼 수상기의 음성간섭 제거회로Audio Interference Cancellation Circuit of TV Receiver

제1도는 본 발명의 실시예 1에 따른 텔레비젼 수상기의 음성간섭 제거회로의 구성을 나타낸 회로도.1 is a circuit diagram showing the configuration of an audio interference cancellation circuit of a television receiver according to Embodiment 1 of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 튜너 2 : 증폭부1: Tuner 2: Amplifier

3 : 마이크로 컴퓨터 4 : D/A 변환부3: microcomputer 4: D / A converter

5 : 중간주파수모듈 6 : 트랩 발진부5: Middle frequency module 6: Trap oscillator

7 : 감쇄부7: attenuation part

본 발명은 텔레비젼 수상기의 음성간섭 제거회로에 관한 것으로, 특허 NTSC 방송방식에 있어서, 음성캐리어신호의 간섭 현상을 제거하기 위한 텔레비젼 수상기의 음성간섭 제거회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a speech interference cancellation circuit of a television receiver, and more particularly to a speech interference cancellation circuit of a television receiver for removing interference phenomenon of a voice carrier signal in the patent NTSC broadcasting system.

NTSC나 SECAM 등의 각각 다른 방송 방식에 대응하여, 방송 수신이 가능한 다중 기능의 텔레비젼 수상기가 개발, 판매되고 있다.In response to different broadcasting methods such as NTSC and SECAM, multi-function television receivers capable of receiving broadcasts have been developed and sold.

이러한 다중 기능의 텔레비젼 수상기에서 각 방송 모드를 전환할 때, 비디오신호에 실린 음성신호의 간섭에 따른 영향을 줄이려면, 각 방송 모드에 따른 음성 캐리어신호를 비디오신호로부터 삭제해야만 한다.When switching each broadcasting mode in such a multi-function television receiver, in order to reduce the influence of the interference of the audio signal carried on the video signal, the voice carrier signal corresponding to each broadcasting mode must be deleted from the video signal.

PAL, SECAM 등의 방송 방식의 경우에는, 영상캐리어신호와 음성 캐리어신호 사이의 이득차가 -13∼-1db 정도를 유지하면, 음성 캐리어신호의 간섭 현상이 제거된다.In the broadcast system such as PAL and SECAM, if the gain difference between the video carrier signal and the audio carrier signal is maintained at about -13 to -1 db, the interference phenomenon of the audio carrier signal is eliminated.

반면에, NTSC 방식의 경우에는, 영상 캐리어신호와 음성 캐리어신호 사이의 이득차가 -30∼-40db 이상이 되어야만, 음성 캐리어신호의 간섭 현상을 제거할 수 있다.On the other hand, in the NTSC system, the interference of the audio carrier signal can be eliminated only when the gain difference between the video carrier signal and the audio carrier signal is -30 to -40 db or more.

현실적으로, 이 정도의 이득 차이를 유지하기 어렵기 때문에, 실제 시스템인 NTSC 방송 방식에 있어서는 4.5MHz의 주파수 위치에 트랩(trap)을 거는 방법으로 음성 캐리어신호의 간섭 현상을 제거하고 있다.In reality, since it is difficult to maintain such a difference in gain, in the NTSC broadcasting system which is a real system, the interference phenomenon of the voice carrier signal is eliminated by applying a trap at a frequency position of 4.5 MHz.

그런데, 종래의 다중 기능의 텔레비젼 수상기는 PAL 방식이나 SECAM 방식의 방송모드에서 NTSC 방식의 방송 모드로 전환하는 경우, 수동으로 상기 4.5MHz의 트랩을 걸어주어야 하는 불편함이 있었다.However, when the conventional multi-function television receiver is switched from the PAL or SECAM broadcast mode to the NTSC broadcast mode, it is inconvenient to manually trap the 4.5 MHz trap.

본 발명은 상기한 문제점을 감안하여 창출된 것으로, NTSC 방식의 방송 모드로 전환하는 경우, 자동으로 상기 트랩이 형성되어 음성 캐리어신호의 간섭 현상을 제거하도록 구성된 텔레비젼 수상기의 음성간섭 제거회로를 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides a speech interference cancellation circuit of a television receiver configured to automatically form a trap to remove an interference phenomenon of a voice carrier signal when switching to an NTSC broadcast mode. The purpose is.

상기 구성으로 된 본 발명에 따른 텔레비젼 수상기의 음성간섭 제거회로에 의하면, NTSC 방송 방식이 판정되는 경우에만, 상기 트랩 발진부가 동작하여 소정 주파수 대역의 음성 캐리어신호를 감쇄시키므로, 음성 캐리어신호에 의한 간섭 현상을 제거할 수 있게 된다.According to the audio interference cancellation circuit of the television receiver according to the present invention having the above-described configuration, since the trap oscillator operates to attenuate the voice carrier signal of a predetermined frequency band only when the NTSC broadcasting system is determined, interference by the voice carrier signal is caused. The phenomenon can be eliminated.

이하, 첨부된 도면을 참조하여 본 발명의 실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

제1도는 본 발명의 실시예 1에 따른 텔레비젼 수상기의 음성간섭 제거회로의 구성을 나타낸 회로도이다.1 is a circuit diagram showing the configuration of the audio interference cancellation circuit of the television receiver according to the first embodiment of the present invention.

제1도에 도시된 바대로, 본 발명의 텔레비젼 수상기의 음성간섭 제거회로는 튜너(1), 증폭수단(2), 중간주파수모듈(5)로 구성된 텔레비젼 수상기에 있어서, 선국된 방송신호의 방송모드를 판정하여, 이에 따른 소정의 제어신호를 출력하는 마이크로 컴퓨터(3), 마이크로 컴퓨터(3)로부터 출력된 제어신호를 아날로그신호로 변환하여 출력하는 디지탈/아날로그 변환수단(4), 상기 마이크로 컴퓨터(3)에서 NTSC 방식을 판정하는 경우, 발진주파수의 발진신호를 출력하는 트랩발진수단(6), 상기 트랩발진수단(6)으로부터 출력된 소정의 발진주파수의 발진신호에 근거하여, 상기 중간주파모듈(5)로부터 출력된 중간주파신호중에서 소정 대역의 신호를 감쇄시켜 트랩을 형성하는 감쇄수단(7)으로 구성된다.As shown in Fig. 1, the audio interference canceling circuit of the television receiver of the present invention is a television receiver composed of a tuner 1, an amplifying means 2, and an intermediate frequency module 5, which broadcasts a tuned broadcast signal. A microcomputer 3 for determining a mode and outputting a predetermined control signal, a digital / analog converting means 4 for converting a control signal output from the microcomputer 3 into an analog signal, and outputting the analog signal; When the NTSC system is determined in (3), the intermediate frequency is based on the trap oscillation means 6 for outputting the oscillation signal of the oscillation frequency and the oscillation signal of the predetermined oscillation frequency output from the trap oscillation means 6. Among the intermediate frequency signals output from the module 5, attenuating means 7 forms a trap by attenuating a signal of a predetermined band.

좀더 자세히 설명하면 다음과 같다.In more detail,

제1도에서, 도면부호 1은 방송을 선국하기 위한 튜너이고, 2는 선국된 방송신호를 소정 레벨의 신호로 증폭하는 증폭부, 3은 방송모드를 판정함과 더불어, 그에 따른 소정의 제어신호를 출력하는 마이크로 컴퓨터, 4는 마이크로 컴퓨터의 제어신호를 아날로그신호로 변환하는 디지탈/아날로그 변환부(이하, D/A 변환부라 함), 5는 중간주파신호를 검출하는 중간주파모듈, 6은 상기 마이크로 컴퓨터(3)에서 NTSC 방식을 판정하는 경우, 소정 주파수로 발진하는 트랩 발진부, 7은 이 트랩 발진부(6)의 소정의 발진 주파수에 근거하여, 상기 중간주파모듈(5)의 중간주파신호중에서 소정 대역의 신호를 감쇄시켜 트랩을 형성하는 감쇄부이다.In Fig. 1, reference numeral 1 denotes a tuner for tuning a broadcast, 2 denotes an amplifier for amplifying the tuned broadcast signal to a signal of a predetermined level, 3 determines a broadcast mode, and a predetermined control signal accordingly. A microcomputer for outputting a signal, 4 is a digital / analog converter (hereinafter referred to as a D / A converter) for converting a control signal of the microcomputer to an analog signal, 5 is an intermediate frequency module for detecting an intermediate frequency signal, 6 is the above When the microcomputer 3 determines the NTSC system, the trap oscillation unit oscillating at a predetermined frequency, 7 is based on the predetermined oscillation frequency of the trap oscillation unit 6, and among the intermediate frequency signals of the intermediate frequency module 5. An attenuation portion that attenuates a signal of a predetermined band to form a trap.

이하, 이와 같이 구성된 본 발명의 동작을 자세히 설명한다.Hereinafter, the operation of the present invention configured as described above will be described in detail.

상기 마이크로 컴퓨터(3)가 NTSC 방식을 판정하여 소정의 제어신호를 출력하면, 이 제어신호는 상기 D/A 변환부(4)에서 소정 레벨(하이 레벨)의 아날로그신호로 변환되어 상기 트랩발진부(6)의 제1저항(R1)을 통해 스위칭 트랜지스터인 제1트랜지스터(Q1)의 베이스에 공급된다.When the microcomputer 3 determines the NTSC system and outputs a predetermined control signal, the control signal is converted into an analog signal of a predetermined level (high level) by the D / A converter 4 and the trap oscillator ( It is supplied to the base of the first transistor Q1 which is a switching transistor through the first resistor R1 of 6).

이때, 이 스위칭 트랜지스터(Q1)가 온됨에 따라, 상기 트랩발진부(6)가 동작하여 소정의 발진주파수의 발진신호를 출력하게 된다.At this time, as the switching transistor Q1 is turned on, the trap oscillation unit 6 operates to output an oscillation signal having a predetermined oscillation frequency.

이때, 발진주파수는, 상술한 바와 같이, 4.5MHz로 조정되어 있다.At this time, the oscillation frequency is adjusted to 4.5 MHz as described above.

상기 트랩발진부(6)의 발진주파수의 발진신호는 상기 감쇄부(7)의 제2트랜지스터(Q2)에 공급된다.The oscillation signal of the oscillation frequency of the trap oscillator 6 is supplied to the second transistor Q2 of the attenuator 7.

이때, 제2트랜지스터(Q2)는 상기 트랩 발진부(6)의 발진주파수의 발진신호에 따라 스위칭됨에 따라, 상기 중간주파모듈(5)로부터 출력되는 신호 중에서 상기 발진주파수(4.5MHz)에 해당되는 신호가 감쇄되어 트랩이 형성된다.In this case, as the second transistor Q2 is switched according to the oscillation signal of the oscillation frequency of the trap oscillation unit 6, a signal corresponding to the oscillation frequency (4.5MHz) among the signals output from the intermediate frequency module 5. Is attenuated to form a trap.

이상에서 설명한 바와 같이, 본 발명에 의하면, NTSC 방식에 있어서, 상기 마이크로 컴퓨터(4)에 의해 NTSC 방식을 판정하고, 소정 대역의 신호를 자동으로 감쇄시키는 트랩을 형성함에 따라, 비디오신호에 음성 캐리어신호가 혼입되는 간섭 현상을 제거할 수 있음에 따라, 양호한 화질을 얻을 수 있는 효과가 있다.As described above, according to the present invention, in the NTSC method, the microcomputer 4 determines the NTSC method, and forms a trap for automatically attenuating a signal of a predetermined band, so that an audio carrier is included in the video signal. As the interference phenomenon in which the signal is mixed can be eliminated, there is an effect that a good image quality can be obtained.

또한, 본 발명은 상기 실시예에 한정되지는 않으며, 본원 발명의 기술적 요지를 벗어나지 않는 범위내에서 변형 실시될 수 있다.In addition, the present invention is not limited to the above embodiments and may be modified without departing from the technical spirit of the present invention.

Claims (1)

튜너(1), 증폭수단(2), 중간주파모듈(5)로 구성된 텔레비젼 수상기에 있어서, 선국된 방송신호의 방송모드를 판정하여, 이에 따른 소정의 제어신호를 출력하는 마이크로 컴퓨터(3), 상기 마이크로 컴퓨터(3)로부터 출력된 제어신호를 아날로그신호로 변환하여 출력하는 디지탈/아날로그 변환수단(4), 상기 마이크로 컴퓨터(3)에서 NTSC 방식을 판정하는 경우, 발진주파수의 발진신호를 출력하는 트랩발진수단(6), 상기 트랩발진수단(6)으로부터 출력된 소정의 밭진주파수의 발진신호에 근거하여, 상기 중간주파모듈(5)로부터 출력된 중간주파신호중에서 소정 대역의 신호를 감쇄시켜 트랩을 형성하는 감쇄수단(7)으로 구성된 텔레비젼 수상기의 음성간섭 제거회로.In a television receiver comprising a tuner (1), an amplifying means (2), and an intermediate frequency module (5), a microcomputer (3) for determining a broadcast mode of a tuned broadcast signal and outputting a predetermined control signal accordingly; The digital / analog converting means 4 for converting the control signal output from the microcomputer 3 into an analog signal and outputting the analog signal, and for outputting the oscillation signal of the oscillation frequency when the microcomputer 3 determines the NTSC method. Based on the oscillation signal of the predetermined oscillation frequency outputted from the trap oscillation means 6 and the trap oscillation means 6, a trap of a predetermined band is attenuated among the intermediate frequency signals output from the intermediate frequency module 5; An audio interference canceling circuit of a television receiver composed of attenuating means (7) for forming a signal.
KR1019940003564A 1994-02-26 1994-02-26 Circuit for removing sound interruption of tv KR970009464B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940003564A KR970009464B1 (en) 1994-02-26 1994-02-26 Circuit for removing sound interruption of tv

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940003564A KR970009464B1 (en) 1994-02-26 1994-02-26 Circuit for removing sound interruption of tv

Publications (2)

Publication Number Publication Date
KR950026231A KR950026231A (en) 1995-09-18
KR970009464B1 true KR970009464B1 (en) 1997-06-13

Family

ID=19377861

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940003564A KR970009464B1 (en) 1994-02-26 1994-02-26 Circuit for removing sound interruption of tv

Country Status (1)

Country Link
KR (1) KR970009464B1 (en)

Also Published As

Publication number Publication date
KR950026231A (en) 1995-09-18

Similar Documents

Publication Publication Date Title
JPH10256932A (en) Reception tuner shared between analog and digital broadcasting
KR920022884A (en) Audio level equalizers for television acoustic RF signals, broadcast FM RF signals and national weather service FM RF signals
KR100211412B1 (en) Interrupting the video if signal path during fm radio mode in a television receiver
KR100786594B1 (en) Television receiver for digital signals with offset tuning provisions
KR970009464B1 (en) Circuit for removing sound interruption of tv
KR19990008178A (en) A television receiver
US4396949A (en) Television sound receiver
KR200197860Y1 (en) Tuner for receiving television signal
KR20000002038A (en) Audio signal processing device for both digital and analog broadcast
KR100772232B1 (en) Tunning method and apparatus
JPS6211085Y2 (en)
KR960015503B1 (en) Sound compensation circuit of multi-t.v. receiver
KR100211466B1 (en) Image noise elimination of digtal sound signal for a television
JP3500720B2 (en) Magnetic recording / reproducing device
JPH04237286A (en) Catv converter
KR970004669Y1 (en) Color blooming preventing circuit of television screen
KR20000028423A (en) Apparatus for automatically setting up/outputting sounds according to tv programs and method the same
JPS5951777B2 (en) automatic frequency control device
JP3586060B2 (en) Intermediate frequency circuit
KR0135881B1 (en) Automatic mute circuitry of catv converter
KR19980032835U (en) TV with noise reduction function of sound signal
JPH09298754A (en) Multi-system high frequency receiver
KR19980037136A (en) Converter for video signal processing
JPS5958987A (en) Frequency characteristic compensating device of television receiver
KR20010010283A (en) Method for processing sound from broadcasting formula of east europe

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee