KR900006435B1 - Preventing picture's beat circuit for pal-bg and seccaml common tuner - Google Patents
Preventing picture's beat circuit for pal-bg and seccaml common tuner Download PDFInfo
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- KR900006435B1 KR900006435B1 KR1019880001364A KR880001364A KR900006435B1 KR 900006435 B1 KR900006435 B1 KR 900006435B1 KR 1019880001364 A KR1019880001364 A KR 1019880001364A KR 880001364 A KR880001364 A KR 880001364A KR 900006435 B1 KR900006435 B1 KR 900006435B1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Description
제1도는 본 발명과 관련된 팔 BG 세캄 L공용튜너의 수신회로.1 is a receiving circuit of the arm BG Secam L common tuner related to the present invention.
제2도는 본 발명의 회로계통도.2 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 팔 BG 튜너1: arm BG tuner
11 : 더블밸런스드 믹서(double balanced mixer)11: double balanced mixer
12 : RF가변트랩기 13 : 1차발진기 가변트랩기12: RF variable trap 13: primary oscillator variable trap
14 : IF동조단 15 : 증폭기14: IF tuning stage 15: amplifier
본 발명은 팔 BG 세캄 L공용튜너에서 단간동조 출력측에서의 RF주파수와 IF발진주파수와의 1차믹싱 이후 IF동조단을 거쳐 2차믹싱에 진입되는 과정에서 상기 주파수의 1차믹싱시의 출력에 발진기의 주파수와 단간동조출력측의 주파수가 동시에 존재하므로서 그 화면상의 비트발생을 야기하는 현상을 제거키위한 팔BG 세캄 L공용튜너의 화면비트 발생방지회로에 관한 것이다.The present invention relates to the output of the first mixing of the frequency in the process of entering the secondary mixing via the IF tuning stage after the first mixing of the RF frequency and the IF oscillation frequency at the single-side tuning output side in the arm BG Secam L common tuner. The present invention relates to a screen bit generation prevention circuit of an arm BG Secam L common tuner for eliminating a phenomenon that causes the generation of a bit on the screen since the frequency of the oscillator and the frequency of the single-side tuning output side exist simultaneously.
본 발명의 출원인에 의한 1987년의 선특허 출원 제1795호에서는 팔 BG와 세캄 L방식의 방송방식에 따른 튜너측의 회로를 공용으로 수신토록한 것으로 설계되어 있으며, 이는 제1도와 같은 신호처리 계통을 가지고 있다. 즉, 여기서는 팔 BG튜너(3)의 IF(중간주파수)출력을 받아 세캄 L대역중 VHF로우(Low)채널을 수신코자할때 인버터단(2)에 의한 스위치를 오프시켜 다시한번 재믹싱하므로서 팔 BG튜너의 PIF(일예로 38.2MHz) 및 SIF(일예로 32.9MHz)의 주파수를 SIF(38.2MHz), PIF(32.7MHz)로 만들어주는 계통으로되고, 상기 신호조작에 의한 IF출력이 결과적으로 팔 BG방식의 IF와 같게되어 TV수상기측의 수신회로를 가동케 되는 것이었다. 그러나, 이러한 선출된 기술등에 있어서는 팔 BG튜너(3)의 IF출력인 믹서된 신호(일예로 NTSC일 경우 45MHz, 팔방식 : 36MHz)가 1차가변발진주파수와 RF신호가 동시에 출력되어 지므로서 이러한 썩이지 않은 주파수로 인하여 화면상의 비트를 생기게 하므로서 문제가 되어진다.In Patent Application No. 1795 of 1987 by the applicant of the present invention, the circuit of the tuner side in accordance with the broadcast method of ARM BG and Sekam L system is designed to receive in common, which is the signal processing system as shown in FIG. Have That is, in this case, when receiving the IF (intermediate frequency) output of the arm BG tuner (3) and wants to receive the VHF low channel of the Secam L band, the arm is switched off by the inverter stage (2), and the arm is mixed again. It is a system that makes SIF (38.2MHz) and PIF (32.7MHz) the frequencies of PIF (eg 38.2MHz) and SIF (eg 32.9MHz) of the BG tuner. It was the same as the IF of BG method, which enabled the receiving circuit on the TV receiver side. However, in such an elective technique, a mixed signal (eg, 45 MHz in case of NTSC, 36 MHz in case of NTSC), which is an IF output of an arm BG tuner 3, is outputted at the same time as the primary variable oscillation frequency and the RF signal are simultaneously output. This is a problem because it causes on-screen beats due to the intact frequency.
또, 상기예에서의 기술에선 1차발진주파수와 RF신호가 문제를 야기시키지 않았던 것은 IF주파수와 이들 신호가 상호 커다란 주파수차를 가지게 주어지므로서 세트내에서 IF주파수와 재믹싱하는 경우나 제2의 고주파발진 믹싱, 처리과정이 불필요하였기 때문이었다. 그러나, 상기예의 팔 BG 및 세캄 L공용수신용 튜너에 있어서는 상기 세검 L로우벤드(일예로 프랑스채널)인 경우 재믹싱처리를 하여 픽쳐 마커(Picture Marker)와 소리마커(Sound Marker)의 위치를 바꾸어주어야 하므로서 튜너의 출력주파수 성분이 중요한 원인으로 대두되었다. 그러므로, 이러한 공용튜너에의 출력주파수에는 상당한 크기의 1차발진주파수와 RF신호가 동시 존재케 되어 화면상의 비트발생을 제거하기 어려웠다. 특히, 상기 1차믹싱회로는 주로 트랜지스터로 주어지므로서 믹싱신호의 이상적인 믹싱출력인 순수 IF출력만 나타나지 않고 상기 믹싱신호인 RF신호와 1차발진주파수가 혼입된 상태로 존재하므로서 이러한 문제를 해결하기 어려웠던 것이었다.Also, in the above example, the primary oscillation frequency and the RF signal did not cause a problem when the IF frequency and these signals are given a large frequency difference with each other, or when they are remixed with the IF frequency in the set. This was because the high frequency oscillation mixing and processing of the was unnecessary. However, in the above-mentioned arm BG and Secam L public reception tuners, the case of the Segum L low bend (eg, French channel) is remixed to change the position of the picture marker and the sound marker. The tuner's output frequency component has emerged as an important cause. Therefore, the output frequency to the common tuner has a significant magnitude of the primary oscillation frequency and the RF signal at the same time, making it difficult to remove the on-screen bit generation. In particular, since the primary mixing circuit is mainly given as a transistor, only the pure IF output, which is an ideal mixing output of the mixing signal, does not appear, but the RF signal, which is the mixing signal, and the primary oscillation frequency are mixed to solve this problem. It was difficult.
본 발명은 종래의 이러한 문제점을 개선하고자 한것으로서, 이는 상기 1차믹싱된 출력주파수에 RF신호나 1차발진주파수가 존재하는 신호들을 제거한 상태로 2차믹싱기로 보내므로서 이러한 회로에서의 화면상 비트발생의 원인이 되는 문제점을 제거하려는데 그 목적이 있는 것이다.The present invention has been made to solve such a problem in the prior art, which is sent to the secondary mixer with the RF signal or the signal having the primary oscillation frequency at the primary mixed output frequency removed, and thus on-screen in such a circuit. The purpose is to eliminate the problem that causes the bit to occur.
이하에서 이를 좀더 구체적으로 살펴보면 다음과 같다. 즉, 본 발명은 제2도와 같이 필터 및 입력동조회로, 증폭기, 단간동조회로, 발진기를 포함한 믹서, IF동조회로의 직력계통의 팔 BG튜터(3)에서 상기 단간동조회로에 연결되는 믹서를 다이오드에 의한 더블밸런스드 믹서(double balanced Mixer)(11)로한 팔 BG튜너(1)로 되고, 이 믹서(11)의 출력에는 RF가변트랩기(12)와 1차발진기의 가변트랩기(13) 및 IF동조단(14), 증폭기(15),2차측 믹서(16)로 이이지는 직력계통의 구성으로 한것이다. 이러한 구성의 본 발명은 다이오드에 의한 더블밸런스드 믹서(11)를 통해 나오는 중간 주파수의 신호는 1차발진주파수와 RF주파수등이 각기 상기 중간주파수신호와 함께 동시에 존재하므로서, 그 중간 주파수출력신호를 우선 RF가변트랩기(12)를 거쳐 이 중간주파수 출력 신호중에 존재하는 RF주파수를 제거하고, 이를 다시 1차발진기 주파수의 가변트랩기(13)를 거쳐 역시 상기 중간주파수 출력신호중 존재하는 1차발진주파수를 제저한다. 이후, IF동조단(14)를 거쳐 상기 더블밸런스드믹서(11)에 의한 심호감쇄를 증폭기(15)로 보상한 후 2차믹서(16)로 진입시키면, 이 2차믹서(16)로 진입되는 IF주파수출력은 순수한 IF주파수 출력만 남게되어 그 비트밭생의 원인을 제거케 되는 것이다.This will be described in more detail below. That is, the present invention is a mixer connected to the step interlock circuit in the arm BG tutor (3) of the linear system of the filter, the input tuning circuit, the amplifier, the step interlock circuit, the oscillator, the IF tuning circuit as shown in FIG. It is an arm BG tuner (1) having a double balanced mixer (11) by means of a diode, and the output of the mixer (11) is a variable trap (13) and an adjustable trap (13) of the primary oscillator. ) And IF tuning stage 14, amplifier 15, and secondary mixer 16 are configured as a linear system. In the present invention having the above-described configuration, the intermediate frequency signal coming out of the double balanced mixer 11 by the diode has a primary oscillation frequency and an RF frequency, etc., respectively, together with the intermediate frequency signal, so that the intermediate frequency output signal has priority. The
이러한 본 발명은 팔 BG와 세캄 L공용수신튜너등에서 IF주파수를 얻어내는 과정에서 1차믹서기의 이상적주파수혼합이 불가능함으로 일어나는 비트현상을 이들 RF주파수와 1차발진주파수를 그 믹서 출력측에서 독립적으로 걸러내는 기술적수단을 부여함에 의해 이러한 회로의 불리함을 제거할 수 있로록한 유익한 특징이 있는 것이다.The present invention independently filters the RF frequency and the primary oscillation frequency at the mixer output side for the bit phenomena caused by impossible to mix the ideal frequency of the primary mixer in the process of obtaining the IF frequency in the arm BG and Sekam L public reception tuner. It is a beneficial feature to eliminate the disadvantages of such circuits by imparting technical means.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019880001364A KR900006435B1 (en) | 1988-02-12 | 1988-02-12 | Preventing picture's beat circuit for pal-bg and seccaml common tuner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019880001364A KR900006435B1 (en) | 1988-02-12 | 1988-02-12 | Preventing picture's beat circuit for pal-bg and seccaml common tuner |
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| Publication Number | Publication Date |
|---|---|
| KR890013882A KR890013882A (en) | 1989-09-26 |
| KR900006435B1 true KR900006435B1 (en) | 1990-08-31 |
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| KR1019880001364A KR900006435B1 (en) | 1988-02-12 | 1988-02-12 | Preventing picture's beat circuit for pal-bg and seccaml common tuner |
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