KR810001207Y1 - Transducer of automatic sound intermediate frequency - Google Patents
Transducer of automatic sound intermediate frequencyInfo
- Publication number
- KR810001207Y1 KR810001207Y1 KR2019800003210U KR800003210U KR810001207Y1 KR 810001207 Y1 KR810001207 Y1 KR 810001207Y1 KR 2019800003210 U KR2019800003210 U KR 2019800003210U KR 800003210 U KR800003210 U KR 800003210U KR 810001207 Y1 KR810001207 Y1 KR 810001207Y1
- Authority
- KR
- South Korea
- Prior art keywords
- transformer
- intermediate frequency
- mhz
- frequency
- capacitor
- Prior art date
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
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
- H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
-
- 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
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 회로도.1 is a circuit diagram of the present invention.
본 고안은 TV수상기에 사용되는 음성 중간 주파수 변환기에 관한 것이며, 특히 TV수상기 내에 스위치 또는 기타 복잡한 변환 장치를 사용하지 않고도 TV음성 제2중간 주파수가 상이한 2종류의 방송 시스템의 방송을 청취할 수 있도록 한 변환기 회로에 관한 것이다.The present invention relates to a voice intermediate frequency converter used in a TV receiver, and in particular, to listen to broadcasts of two kinds of broadcasting systems having different TV voice second intermediate frequencies without using a switch or other complicated conversion device in the TV receiver. It relates to a converter circuit.
동남아 제국등지에서는 한 국가내에서 2가지 방식으로 TV방송을 행하고 있다. 즉 CCIR(국제무선통신자문위원회)에서 규정한 시스템 M방식과 시스템 B방식의 TV방송국이 함께 설치되어 있다. 이에 따라 2가지 방식으로 방송을 할때, 1대의 TV수상기로 방송을 청취하려면 문제점이 야기된다. 시스템 M방식으로 제작된 TV수상기로 시스템 B방식의 방송을 시청할땐, 화면이 나오나 음성이 전혀 나오지 않는다.Southeast Asian empires, etc., broadcast TV in two ways in one country. In other words, the TV stations of the system M system and system B system specified by the CCIR (International Radio Communication Advisory Committee) are installed together. Accordingly, when broadcasting in two ways, there is a problem to listen to the broadcast with one TV receiver. When watching a system B type broadcast with a TV receiver produced by the system M type, the screen is displayed but no audio is heard.
본 고안은 이점에 착안하여 안출한 것으로, 방송방식의 차이에 기인한 상이한 음성 제2중간 주파수(예를들어, 6MHz나 6.5MHz, 5.5MHz와 6.0MHz, 5.5MHz와 6.5MHz, 4.5MHz와 5.5MHz, 4.5MHz와 6MHz, 4.5MHz와 6.5MHz 등)의 선택을 위해, 종래의 음성 중간 주파 트랜스와 FM 복조회로사이에 발진회로 및 상이한 공진 주파수를 갖는 트랜스 등으로 된 회로를 구성하여, 단순한 채널 변환만으로 원하는 방송을 청취할 수 있게 하였다.The present invention has been devised in view of the above advantages, and is due to the difference in the broadcasting method, and the second intermediate frequency (for example, 6 MHz or 6.5 MHz, 5.5 MHz and 6.0 MHz, 5.5 MHz and 6.5 MHz, 4.5 MHz and 5.5) MHz, 4.5MHz and 6MHz, 4.5MHz and 6.5MHz, etc.), a circuit consisting of an oscillation circuit and a transformer having a different resonance frequency between the conventional voice intermediate frequency transformer and the FM demodulation circuit is constructed, By changing the channel, you can listen to the desired broadcast.
본 고안에 의한 자동 TV음성 중간 주파수 변환기의 회로를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.Referring to the circuit of the automatic TV voice intermediate frequency converter according to the present invention in detail as follows.
제1도는 본 고안에 의한 주파수 자동 변환 회로인데, 중간 주파 트랜스(T1)와 FM 복조회로(미표시) 사이에 있어서, 트랜지스터(Q1), 트랜스(T2), 콘덴서(C4), 저항기(R3) 등으로 된 발진 회로를 중간 주파 트랜스(T1)의 2차측에 연결하고, 트랜스(T2)의 한 단자를 저항기(R4)를 통해 트랜스(T3)의 1차측에 연결시켰으며, 트랜스(T3)의 2차측은 FM 복조회로에 연결된다. 또한 콘덴서(C6)를 입력단과 트랜스(T3)의 1차측 사이에 구성하였다.1 is a frequency automatic conversion circuit according to the present invention, which includes a transistor Q1, a transformer T2, a capacitor C4, and a resistor R3 between an intermediate frequency transformer T1 and an FM demodulation circuit (not shown). The oscillating circuit of the back is connected to the secondary side of the intermediate frequency transformer T1, one terminal of the transformer T2 is connected to the primary side of the transformer T3 through the resistor R4, and The secondary side is connected to the FM demodulation circuit. In addition, a capacitor C6 was configured between the input terminal and the primary side of the transformer T3.
회로내의 콘덴서 C1, C6는 DC차단용 결합 콘덴서이고, 콘덴서 C3는 바이패스(by-pass)용이며, 콘덴서 C2, 트랜스 T1 및 콘덴서 C7, 트랜스 T3는 병렬 공진 회로로써 중간주파 트랜스 T1은, 예를들어, 5.5MHz에, 트랜스 T3는 4.5MHz에 각각 공진하도록 되어 있다. 또한 트랜스 T2는 발진 트랜스로써 정확하게 1MHz에 발진하도록 되어 있으며, 콘덴서 C4는 발진 콘덴서이다. 저항기 R1, R2, R3는 각각 바이어스(bias)용 저항이다. 콘덴서 C7, 트랜스 T3로 된 병렬 공진 회로 이후의 FM 복조회로(미표시)는 4.5MHz를 중심으로한 주파수 변조 성분을 음성 신호로 복조할 수 있도록 조정되어 있다.The capacitors C1 and C6 in the circuit are DC blocking coupled capacitors, and the capacitor C3 is for bypass. The capacitors C2, transformer T1 and capacitors C7 and transformer T3 are parallel resonant circuits. For example, at 5.5 MHz, the transformer T3 is resonated at 4.5 MHz, respectively. In addition, the transformer T2 is an oscillating transformer to oscillate precisely at 1 MHz, and the capacitor C4 is an oscillating capacitor. Resistors R1, R2, and R3 are resistors for bias, respectively. The FM demodulation circuit (not shown) after the parallel resonant circuit consisting of the capacitor C7 and the transformer T3 is adjusted to demodulate the frequency modulated component centered on the 4.5 MHz into the audio signal.
이제, 예를들어, CCIR의 시스템 M인 방송국에 채널을 맞춘다고 하면, 이 경우에는 영상과 음성이 분리되는 회로에서 음성 제2중간 주파수로써 4.5MHz를 중심으로 변조된 주파수 성분이 얻어지기 때문에 5.5MHz에 공진되어 있는 중간주파 트랜스 T1에서는 전혀 신호 성분이 혼입되지 못하고 콘덴서 C6을 통해 4.5MHz에 공진되어 있는 트랜스 T3의 1차측에 유기되어 2차측에 나타나므로 4.5MHz 정도에서 “S”커브를 이루고 있는 T3이후의 FM 복조회로에서 복조되어 가청 신호로 변환하게 된다.Now, for example, if a channel is tuned to a broadcasting station of system M of CCIR, in this case, a frequency component modulated around 4.5 MHz is obtained as a second intermediate frequency of speech in a circuit in which video and audio are separated. In the intermediate frequency transformer T1 resonated at MHz, no signal component is mixed at all, and it is induced on the primary side of the transformer T3 resonated at 4.5 MHz through the capacitor C6 and appears at the secondary side. The demodulator is then demodulated in the FM demodulation circuit after T3 and converted into an audible signal.
반면에, 시스템 B인 방송국에 채널을 마춘다고 하면, 시스템M의 경우와 유사하게 5.5MHz를 중심으로 주파수가 변조된 신호 성분이 얻어지므로, 콘덴서 C6를 경유해서 4.5MHz에 공진되어 있는 트랜스 T3에는 전혀 혼입되지 못하고, 콘덴서 C1을 통해 5.5MHz에 공진되어 있는 중간주파 트랜스 T1의 1좌측에 인입된다.On the other hand, if the channel is finished to the broadcasting station of system B, a signal component whose frequency is modulated about 5.5 MHz is obtained similarly to the case of system M. Therefore, the transformer T3 resonates at 4.5 MHz via the capacitor C6. It is not mixed at all, and is introduced to the left side of the intermediate frequency transformer T1 resonated at 5.5 MHz through the capacitor C1.
따라서 C급 동작을 하고 있는 트랜지스터 Q1 및 트랜스 T2의 발진회로가 정확히 1MHz에서 발진하게 되면, 트랜스 T1의 2차측에 나타난 5.5MHz 신호 성분과 발진된 주파수 1MHz와의 사이에는 5.5MHz 및 1MHz 이외에도 퓨리에(Fourier) 급수적인 수많은 주파수가 발생하여 저항기 R4를 통해 트랜스 T3의 1차측에 나타날 수 있지만, 트랜스 T3은 온 4.5MHz에 공진되어 있기 때문에 수많은 고주파중에서도 두 주파수의 차이(5.5MHz-1MHz)인 4.5MHz의 신호 성분만이 트랜스 T3의 공진주파수와 일치하므로, 결국 트랜스 T3의 2차측에 나타나는 신호는 4.5MHz의 성분밖에 없게 된다. 따라서 가청 주파수로 변환하는 4.5MHz FM 복조회로에 상기 신호 성분을 가하면 음성신호로 변환하게 된다.Therefore, if the oscillation circuits of transistors Q1 and T2 operating in class C oscillate at exactly 1 MHz, the Fourier (Fourier) is added between the 5.5 MHz signal component on the secondary side of the transformer T1 and the oscillated frequency 1 MHz. ) Numerous frequencies can occur and appear on the primary side of transformer T3 through resistor R4, but since transformer T3 is resonant at 4.5 MHz, the frequency difference between the two frequencies (5.5 MHz-1 MHz) Since only the signal component coincides with the resonance frequency of the transformer T3, the signal appearing on the secondary side of the transformer T3 has only a component of 4.5 MHz. Therefore, when the signal component is added to the 4.5 MHz FM demodulation circuit converting to an audible frequency, the signal is converted into an audio signal.
상기 회로는 비단 4.5MHz와 5.5MHz 뿐만이 아니고 상기한 바와 같이 T1과 T3의 공진주파수, 그리고 T2의 발진 주파수를 바꿔줌에 따라 6MHz와 6.5MHz, 4.5MHz와 6MHz 등 기타 모든 TV방송 방식에 따른 청취를 할 수 있다. 물론 본 회로는 음성 부분에만 국한되므로 TV의 수평과 수직 주사선 수가 다른 시스템 B와 M을 시청할때는 따로 TV의 영상 부분을 조정해야 한다.The circuit is not only 4.5MHz and 5.5MHz, but also changes according to the resonant frequency of T1 and T3 and the oscillation frequency of T2 as described above, and listens to all other TV broadcasting methods such as 6MHz, 6.5MHz, 4.5MHz and 6MHz. You can do Of course, this circuit is limited to the audio portion, so when watching systems B and M where the number of horizontal and vertical lines of the TV is different, it is necessary to adjust the video portion of the TV separately.
이와같이 본 고안은 2개의 서로 상이한 방송 시스템에 의한 방송 주파수의 제2중간 주파수를 다른 특별한 장치가 사용되지 않고도 간단히 채널만 교환시키므로 자동적으로 선택하여 음성을 청취하도록 하므로써, 각 방송 방식에 따라 그에 맞는 TV세트를 각각 비치하지 않아도 되는 매우 실용적인 자동 음성 중간 주파수 변환기인 것이다.As such, the present invention automatically selects the second intermediate frequency of the broadcasting frequencies by two different broadcasting systems so that only the channels are exchanged without the use of other special devices, thereby automatically selecting and listening to the voice according to each broadcasting system. It's a very practical automatic voice intermediate frequency converter that doesn't have to have each set.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019800003210U KR810001207Y1 (en) | 1980-05-19 | 1980-05-19 | Transducer of automatic sound intermediate frequency |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019800003210U KR810001207Y1 (en) | 1980-05-19 | 1980-05-19 | Transducer of automatic sound intermediate frequency |
Publications (1)
Publication Number | Publication Date |
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KR810001207Y1 true KR810001207Y1 (en) | 1981-09-19 |
Family
ID=19217423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR2019800003210U KR810001207Y1 (en) | 1980-05-19 | 1980-05-19 | Transducer of automatic sound intermediate frequency |
Country Status (1)
Country | Link |
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KR (1) | KR810001207Y1 (en) |
-
1980
- 1980-05-19 KR KR2019800003210U patent/KR810001207Y1/en not_active IP Right Cessation
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