KR960008166Y1 - Circuit for reducing sound buzz - Google Patents
Circuit for reducing sound buzz Download PDFInfo
- Publication number
- KR960008166Y1 KR960008166Y1 KR2019930007124U KR930007124U KR960008166Y1 KR 960008166 Y1 KR960008166 Y1 KR 960008166Y1 KR 2019930007124 U KR2019930007124 U KR 2019930007124U KR 930007124 U KR930007124 U KR 930007124U KR 960008166 Y1 KR960008166 Y1 KR 960008166Y1
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- South Korea
- Prior art keywords
- aft
- circuit
- buzz
- sound
- curve
- Prior art date
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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
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers
-
- 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
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
요약없음No summary
Description
제1도는 본 고안의 사운드 버즈 감쇄회로도.1 is a sound buzz attenuation circuit of the present invention.
제2도의 (A-D)는 사운드 버즈 감쇄회로의 AFT 커브를 보인 그래프도.(A-D) of FIG. 2 is a graph showing the AFT curve of the sound buzz attenuation circuit.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : AFT IC20 : AFT 탱크 코일10: AFT IC20: AFT Tank Coil
본 고안은 저가형 유무선 텔레비젼의 사운드회로에 관한 것으로, 특히 PIF와 SIF 신호를 한주파수 대역에 삽입하여 출력하도록한 인터 캐리어 방식(inter-carrier method)을 적용한 것에서 사운드 신호에 혼합 출력되는 노이즈를 제거토록 AFT 커브를 조절할수 있도록한 에이에프티 커브를 이용한 사운드 버즈 감쇄회로에 관한 것이다.The present invention relates to a sound circuit of low-cost wired / wireless television, and in particular, to remove noise mixed in a sound signal in an inter-carrier method that inserts and outputs PIF and SIF signals into one frequency band. The present invention relates to a sound buzz attenuation circuit using an AFT curve that can adjust an AFT curve.
종래의 회로는 AFT IC에 외장된 AFT탱크 코일(10)과 콘덴서(C1, C2)의 공진회로에 의해 45.75 M Hz 에서 공진시켜 탱크 코일을 조절하므로써 AFT 검파 회로로 사용하고 있다.The conventional circuit is used as an AFT detection circuit by controlling the tank coil by resonating at 45.75 M Hz by the resonant circuit of the AFT tank coil 10 and the capacitors C1 and C2 external to the AFT IC.
이경우에는 중간 주파수의 입력이 인터 캐리어방식 때문에 필요한 주파수 45.75 + 1.5 MHz 만 검파하기에는 대역 설정이 대단히 까다로워서 사운드 반송파 신호(SOUND CARRIER SIGNEL : 이하 S 반송파 라고 칭함)가 있는 저 대역까지 검파가 되어(도면 제2도의 (B)) 자연적으로 노이즈 성분인 버즈(BUZZ)성분이 포함되어 출력되었다.In this case, the input of the intermediate frequency is too difficult to detect only the required frequency 45.75 + 1.5 MHz due to the inter-carrier method, so that it is detected up to the low band where the sound carrier signal (SOUND CARRIER SIGNEL: hereinafter called S carrier) is detected. (B) of FIG. 2) A BUZZ component, which is a noise component, is naturally included and output.
상기와 같이 인터 캐리어 방식을 채택한 텔레비젼은 단가가 낮아지는 장점은 있지만, 상기와 같이 AFT 검파회로에서 노이즈 까지 검파를 수행하므로 해서 음질이 나빠지는 문제점이 있어서 사용자들에게 불편을 끼쳐 왔던것이다.As described above, the television adopting the inter-carrier method has the advantage of lowering the unit price, but the sound quality is deteriorated by detecting the noise from the AFT detection circuit as described above, causing inconvenience to users.
본 고안은 상기와 같은 문제점을 해결하고자 안출한 것으로서, 본 고안의 목적은 댐핑저항을 추가 접속하므로서 AFT 커브로부터 S 반송파 성분에 영향을 적게 주어 사운드 검파신호에 부즈 성분이 나타나지 않게 하는 에이에프티 커브(AFT CURVE)를 이용한 사운드 부저 감쇄회로 를 제공하고자 하는 것이다.The present invention has been devised to solve the above problems, and an object of the present invention is to provide a damping resistance, thereby reducing the influence of the S carrier component from the AFT curve so that the booze component does not appear in the sound detection signal. It is to provide a sound buzzer attenuation circuit using AFT CURVE.
상기와 같은 목적을 달성하기 위하여 본 고안의 구성을 첨부된 도면을 이용하여 설명하면 다음과 같다.In order to achieve the above object, the configuration of the present invention will be described with reference to the accompanying drawings.
AFT IC(10), AFT 탱크 코일(20)을 구비하고, 상기 AFT IC(10)의 입출력 단자에 상기 AFT 탱크 코일(20)과 콘덴서(C1,C2)가 연결된 것에 있어서, 댐핑용 저항(R1)를 콘덴서(C1)에 병렬연결하여 구성된다.AFT IC 10 and AFT tank coil 20, and the AFT tank coil 20 and the capacitor (C1, C2) is connected to the input and output terminals of the AFT IC 10, the damping resistor (R1) ) Is connected to the capacitor (C1) in parallel.
상기와 같이 구성된 본 고안의 구성을 토대로 본 고안의 동작 및 그 작동설명을 하면 다음과 같다.Based on the configuration of the present invention configured as described above, the operation and description of the operation of the present invention are as follows.
먼저 제2도는 사운드 버즈 감쇄회로의 AFT 커브를 보인 그래프도로서 제A도는 쏘 필터로 부터 출력되는 영상신호 중간 주파수의 전반부에 실린 S반송파와 후반부에 실린 P반송파(PICTURE CARRIER)가 혼합되어 있음을 보인 그래프도이고, 제B도는 상기 제1도의 AFT 탱크코일(20)로 부터 출력되는 파형을 보인 그래프도이고, 제C도는 종래의 시스템의 AFT커브를 출력하는 파형을 보인 그래프도이며, 제D도는 본 고안의 회로 적용시 출력되는 AFT커브를 출력하는 파형을 보인 그래프를 나타낸것이다.2 is a graph showing the AFT curve of a sound buzz attenuation circuit. FIG. A is a diagram showing a mixture of an S carrier in the first half of the intermediate frequency of the video signal output from the saw filter and a P carrier (PICTURE CARRIER) in the second half. FIG. B is a graph showing waveforms output from the AFT tank coil 20 of FIG. 1, and FIG. C is a graph showing waveforms outputting the AFT curve of a conventional system, and FIG. FIG. Is a graph showing a waveform outputting an AFT curve output when a circuit of the present invention is applied.
본 고안은 상기와 같이 댐핑용저항(R1)을 AFT IC(10)에 연결된 콘덴서(C1)에 병열연결하여 추가함으로서 제2도의 D도와 같이 AFT커브가 S 반송파로 부터 상당히 떨어져 있음을 볼 수 있으며 제C도에서 보는 바와 같이 넓은 주파수대역을 차지하고 있는 종래의 AFT 커브를 줄여 주므로 비디오 성분이 제D도처럼 비디오 성분이 S반송파에 영향을 적게 주도록 주파수 대역을 좁혀주므로써 미도시된 사운드신호 검파수단에 의한 출력에는 버즈 성분이 나타나지 않게 하는 것이다.The present invention adds the damping resistor (R1) in parallel with the capacitor (C1) connected to the AFT IC 10 as described above, it can be seen that the AFT curve is significantly separated from the S carrier as shown in FIG. As shown in FIG. C, the conventional AFT curve that occupies a wide frequency band is reduced, so that the video component narrows the frequency band so that the video component has less influence on the S carrier, as shown in FIG. The buzz component is suppressed in the output by.
이상과 같이 본 고안은 1 개의 저항만을 연결하여 AFT 커브의 주파수 대역을 축소시키므로써 AFT의 스피드를 높일수 있으며 가격 상승의 요인 없이도 버즈 잡음을 제거할수 있는 유용한 고안이다.As described above, the present invention can reduce the frequency band of the AFT curve by connecting only one resistor, thereby increasing the speed of the AFT and removing the buzz noise without causing a price increase.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019930007124U KR960008166Y1 (en) | 1993-04-30 | 1993-04-30 | Circuit for reducing sound buzz |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019930007124U KR960008166Y1 (en) | 1993-04-30 | 1993-04-30 | Circuit for reducing sound buzz |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR940025713U KR940025713U (en) | 1994-11-18 |
| KR960008166Y1 true KR960008166Y1 (en) | 1996-09-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019930007124U KR960008166Y1 (en) | 1993-04-30 | 1993-04-30 | Circuit for reducing sound buzz |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR960008166Y1 (en) |
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1993
- 1993-04-30 KR KR2019930007124U patent/KR960008166Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR940025713U (en) | 1994-11-18 |
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