KR800002010Y1 - Automatic hi-blend circuit - Google Patents

Automatic hi-blend circuit Download PDF

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Publication number
KR800002010Y1
KR800002010Y1 KR7907902U KR790007902U KR800002010Y1 KR 800002010 Y1 KR800002010 Y1 KR 800002010Y1 KR 7907902 U KR7907902 U KR 7907902U KR 790007902 U KR790007902 U KR 790007902U KR 800002010 Y1 KR800002010 Y1 KR 800002010Y1
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KR
South Korea
Prior art keywords
transistor
circuit
automatic
relay
blend circuit
Prior art date
Application number
KR7907902U
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Korean (ko)
Inventor
백덕윤
Original Assignee
허신구
주식회사 금성사
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Priority to KR7907902U priority Critical patent/KR800002010Y1/en
Application granted granted Critical
Publication of KR800002010Y1 publication Critical patent/KR800002010Y1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals
    • H04B1/1661—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

내용 없음.No content.

Description

자동 하이 브랜드(Hi-BLEND)회로Automatic Hi-BLEND Circuit

제 1 도는 종래의 하이브랜드 회로도,1 is a conventional high-brand circuit diagram,

제 2 도는 본 고안의 회로도이다.2 is a circuit diagram of the present invention.

본 고안은 FM 수신기의 자동 하이브랜드(Hi-Blend)회로에 관한 것이다.The present invention relates to an automatic hi-blend circuit of an FM receiver.

종래 FM 수신기의 스테레오 방송수신시에 있어 입력 전계강도가 약하면 잡음성분으로 인하여 스트레오방송을 청취하기 곤란한 경우가 있다. 따라서 종래에는 첨부도면 제 1 도와 같은 방법으로 콘덴서(C)를 하이브랜드 스위치(S1)로 온(ON)시켜 고음력의 분리도를 약화시키므로서 주파수 특성의 감쇄없이 잡음을 감소시켜 좀더 양호한 수신을 할 수가 있었다.If the input field strength is weak at the time of stereo broadcast reception of the conventional FM receiver, it may be difficult to listen to the stereo broadcast due to the noise component. Therefore, in the related art, the capacitor C is turned on to the high-brand switch S 1 in the same manner as in the accompanying drawings to reduce the separation of the high sound power, thereby reducing the noise without attenuation of the frequency characteristics, so that better reception can be achieved. I could.

즉 종래의 하이브랜드회로를 첨부된 도면에 따라 설명하면 증폭기(MPX IC)의 출력단자(L 및 R) 사이에 각기 콘덴서(C1, C2)로 직렬연결하고 출력측에 콘덴서(C)와 하이브랜드 스위치(S1)를 직렬 연결하여 입력전계강도가 약한 방송을 수신하면 하이브랜드 스위치(S1)를 온(ON)시키고 입력전계강도가 강한 방송을 수신하면 오프(Off)해주어야 하였던 것인바 이와같은 방법은 방송수신 상태에 따라 일일이 수동으로 온, 오프 조작을 하여야 하는 불편이 있었다.In other words, according to the accompanying drawings, the conventional high-brand circuit is connected between the output terminals (L and R) of the amplifier (MPX IC), respectively, in series with capacitors (C 1 , C 2 ), and the capacitor (C) and the high brand switch on the output side. If you receive a broadcast with a weak input field by connecting (S 1 ) in series, you must turn on the high brand switch (S 1 ) and turn off when a broadcast with a strong input field strength is received. There was an inconvenience of having to manually turn on and off manually according to the broadcast reception state.

본 고안은 종래의 이러한 방법을 개선하여 자동으로 조정되게 한 것으로 이를 첨부된 제 2 도를 참조하여 설명하면 다음과 같다.The present invention is to improve the conventional method to be automatically adjusted as described with reference to the accompanying Figure 2 as follows.

출력증폭기(MPX IC)의 출력단(b, c) 사이에 콘덴서(C)와 릴레이를 직렬연결하고, 튜너(Tuner)에서 선정된 주파수는 중간주파증폭기(IF AMP)를 통해 출력측(a)에 인가되며, 출력측(a)의 일단은 다이오드(D2)와 저항(R3) 및 신호 미터기(M)에 직렬로 접지되며, 또다른 일단은 저항(R1)을 통해 트랜지스터(TR1)의 베이스에 접속한다.Connect the capacitor (C) and the relay in series between the output terminals (b, c) of the output amplifier (MPX IC), and the frequency selected by the tuner is applied to the output side (a) through the intermediate frequency amplifier (IF AMP). One end of the output side (a) is grounded in series with the diode (D 2 ), the resistor (R 3 ) and the signal meter (M), and the other end is the base of the transistor (TR 1 ) through the resistor (R 1 ). Connect to

트랜지스터(TR1)의 에미터와 트랜지스터(TR2)의 베이스를 접속하고, 트랜지스터(TR2)의 에미터는 접지시키며, 트랜지스터(TR1),(TR2)의 콜렉터는 공동접속되어 다이오드(D1)와 병렬연결된 릴레이를 거쳐 전원(B+)에 연결 구성된 것이다. 도면중 미설명부호 L 및 R은 출력단자이다.The emitter of the transistor TR 1 and the base of the transistor TR 2 are connected, the emitter of the transistor TR 2 is grounded, and the collectors of the transistors TR 1 and TR 2 are jointly connected so that the diode D It is connected to the power supply (B + ) through a relay connected in parallel with 1 ). In the drawings, reference numerals L and R denote output terminals.

이와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.

일반적으로 중간주파증폭기(IF AMP)에서 신호미터기(M)를 구동하기 위한 보조회로가 출력측(a)에 연결되어 입력전계의 강도에 따라 비례하는 전압이 표시되고 있으며, 어느 일정 레벨 이하의 전계강도의 전파가 들어오면 출력측(a)의 전압이 낮아져서 다링톤 회로로 구성된 트랜지스터(TR1) 및 트랜지스터(TR2)를 온(ON)시키지 못하므로 릴레이가 오프(OFF)상태가 되어서 접점 d와 e는 도통되어 잡음제거효과를 발생하며, 반면 일정 레벨 이상의 전계강도를 갖는 전파가 들어오면 일정레벨은 R1및 R2의 값으로 임의결정될 수 있다) 트랜지스터(TR1) 및 트랜지스터(TR2)가 온(ON)이 되어 릴레이도 온(ON)이 되므로 접점의 위치는 e와 f로 되어 오프(OFF)가 되므로 정상적인 분리도가 양호한 수신을 할수 있게 된다. 따라서 종래와 같은 전계의 강도에 따라 일일이 하이브랜드 회로를 온, 오프시켜주어야하는 불편이 해소된 것이다.In general, an auxiliary circuit for driving the signal meter (M) in the IF amplifier (AMP) is connected to the output side (a) to display a voltage proportional to the strength of the input electric field. When the electric wave of the signal comes in, the voltage on the output side (a) is lowered and the transistor (TR 1 ) and transistor (TR 2 ) composed of the Darlington circuit cannot be turned on, so that the relay is turned off and the contacts d and e is conductive, and generates a noise-canceling effect, on the other hand comes in a radio wave having over a predetermined level of electric field strength of a certain level can be determined optionally by the value of R 1 and R 2) transistor (TR 1) and the transistor (TR 2) Since the relay is turned ON because the relay is turned ON, the positions of the contacts are turned OFF and OFF so that a good separation can be obtained. Therefore, the inconvenience of having to turn on and off the high-brand circuit according to the strength of the electric field as in the related art is eliminated.

Claims (1)

중간주파증폭기(IF AMP)에 다링톤 회로구성의 트랜지스터(TR1) 및 트랜지스터(TR2)를 접속하고, 트랜지스터(TR1) 및 (TR2)의 콜렉터에 다이오드(D1)와 릴레이를 병렬연결하여 전원(B+)에 연결하며, 출력단(L, R) 사이에 릴레이 접점(d, e, f)을 연결하여 구성된 자동하이브랜드회로.A transistor TR 1 and a transistor TR 2 having a Darlington circuit are connected to the intermediate frequency amplifier IF AMP, and a diode D 1 and a relay are connected in parallel to the collectors of the transistors TR 1 and TR 2 . It is connected to the power source (B + ) by connecting, and the automatic high circuit circuit configured by connecting the relay contacts (d, e, f) between the output terminals (L, R).
KR7907902U 1979-12-31 1979-12-31 Automatic hi-blend circuit KR800002010Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR7907902U KR800002010Y1 (en) 1979-12-31 1979-12-31 Automatic hi-blend circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR7907902U KR800002010Y1 (en) 1979-12-31 1979-12-31 Automatic hi-blend circuit

Publications (1)

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KR800002010Y1 true KR800002010Y1 (en) 1980-12-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR7907902U KR800002010Y1 (en) 1979-12-31 1979-12-31 Automatic hi-blend circuit

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KR (1) KR800002010Y1 (en)

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