KR900011293Y1 - Band changing circuit of electronic tuner - Google Patents
Band changing circuit of electronic tuner Download PDFInfo
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- KR900011293Y1 KR900011293Y1 KR2019830001437U KR830001437U KR900011293Y1 KR 900011293 Y1 KR900011293 Y1 KR 900011293Y1 KR 2019830001437 U KR2019830001437 U KR 2019830001437U KR 830001437 U KR830001437 U KR 830001437U KR 900011293 Y1 KR900011293 Y1 KR 900011293Y1
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
- H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
- H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
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- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
내용 없음.No content.
Description
제1도 본 고안의 1실시예의 VHF 전자 튜우너의 전체회로도.1 is an overall circuit diagram of a VHF electronic tuner of an embodiment of the present invention.
제2도는 그 밴드 변환회로를 표시하는 회로도.2 is a circuit diagram showing the band conversion circuit.
제3도는 본고안의 제2스위칭 다이오드의 다른 결합예를 표시하는 부분회로도.3 is a partial circuit diagram showing another example of coupling of the second switching diode of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
A, B, C : 동조회로 3H : 하이밴드용 밴드변환 전압선A, B, C: Tuning circuit 3H: High band switching voltage line
3L : 로우밴드용 밴드변환전압선 8 : 동조코일3L: Low band band conversion voltage line 8: Tuning coil
9AH, 9AL, 9BH, 9BL, 9CH, 9CL : 제1스위칭 다이오드9AH, 9AL, 9BH, 9BL, 9CH, 9CL: first switching diode
10, 10' : 제2스위칭 다이오드10, 10 ': second switching diode
본고안은 2 밴드변환식 전자튜우너, 특히 VHF 전자 튜우너의 하이밴드와 로우밴드의 변환에 있어서의 전압변환방식과 단자 변환방식의 어느 것에도 채용할수 있는 전자 튜우너의 밴드변환회로에 관한 것이다.The present invention relates to a band conversion circuit of an electronic tuner which can be employed in both a voltage conversion method and a terminal conversion method in the conversion of a high band and a low band of a two-band conversion type electronic tuner, particularly a VHF electronic tuner.
텔레비젼 방송의 VHF 대역을 그 채널 할당이 낮은 주파수영역에 연속하여 할당된 로워채널군과, 그것보다 높은 주파수영역에 연속하여 할당된 하이채널군으로 밴드구분되어 있다.The VHF band of a television broadcast is band-divided into the lower channel group allocated continuously to the frequency area | region where its channel assignment is low, and the high channel group allocated continuously to the higher frequency area | region.
그 때문에 동조회로의 가변 리엑턴스소자 로서 가변용량 다이오드를 사용하여 튜우닝 전압에 의하여 수신주파수를 변화시키도록 한 VHF 전자 튜우너에 있어서는 밴드변환신호에 의하여 하이채널과 로우채널로서 동조회로의 고정 리액턴스 요소인 코일인덕턴스를 변화시키고 있다.Therefore, in a VHF electronic tuner in which a variable capacitance diode is used as a variable reactance element of a tuning circuit to change the reception frequency according to the tuning voltage, a fixed reactance of the tuning circuit is used as a high channel and a low channel by a band conversion signal. The coil inductance which is an element is changing.
이 밴드 변환에는 동조회로의 코일을 하이채널 코일과 로우채널 코일의 2개의 동조코일에 의하여 구성하고, 이 동조코일의 소정 위치에 접속된 스위칭 다이오드에 인가하는 밴드 변환용 전압에 의하여 동 통. 비(非)도통시켜서 특정의 코일을 단락. 개방의 변환으로서 행하여진다.In this band conversion, a coil of a tuning circuit is constituted by two tuning coils of a high channel coil and a low channel coil, and is applied by a band conversion voltage applied to a switching diode connected to a predetermined position of the tuning coil. Non-conductive and short circuit of specific coil. This is done as an open conversion.
이 밴드 변환방식에는 종래 전압변환방식과 단자변환방식이 있었다.This band conversion method has conventional voltage conversion method and terminal conversion method.
전압변환방식은 전압공급단자의 1개를 밴드변환단자로서 사용하고, 여기에 부여하는-밴드 변환전압에 고저의 변화를 부여하여 밴드 변화를 행하는 것으로서 밴드변환용 전압에 고저의 변화를 부여하는 회로를 필요로 한다.In the voltage conversion method, one of the voltage supply terminals is used as a band conversion terminal, and a high and low change is applied to the -band conversion voltage applied thereto, and the band is changed to give a high and low change to the band conversion voltage. Need.
이것에 대하여 단자변환방식은 사전에 각각의 밴드에 따른 2개의 전압공급단자를 사용하여 그 어느 쪽에 동작용 전압을 인가하는 가에 따라서 밴드변환을 행하는 것이다.On the other hand, in the terminal conversion method, band conversion is performed in advance depending on which of the operating voltages is applied to two voltage supply terminals for each band in advance.
이 방식에서는 밴드변환용 전압은 일정 레벨의 것만으로서 좋으나, 2개의 밴드변환단자에 밴드 변환용 전압을 분배하기 위한 스위치가 필요하게 된다.In this system, the voltage for band conversion is good only at a constant level, but a switch for distributing the band conversion voltage is required for two band conversion terminals.
이들 2밴드 변환방식은 VHF 튜우너가 결합되는 텔레비젼 수상기의 방식에 따라서 어느 것인가 채용된다.Either of these two-band conversion methods is adopted depending on the type of television receiver to which the VHF tuner is coupled.
그리고 VHF 튜우너는 단체의 부품으로서 제조되는 것이다.And the VHF tuner is manufactured as part of a unit.
그러므로, 이들 텔레비젼 수상기의 방식에 맞추어 VHF 튜우너를 다른 방식의 것으로서 제조하는 것은 효율이 나쁘고, 원가 상승에 관련되어 있다.Therefore, manufacturing the VHF tuner in a different manner in accordance with the manner of these television receivers is inefficient and related to the cost increase.
그래서 본 고안은 상기한에 비추어 이것을 개량한 것으로서, 이하 실시예에 대하여 설명한다.Therefore, the present invention is an improvement of this in view of the above, and the following Examples will be described.
제1도는 본 고안의 1실시예인 VHF 전자튜우너의 전체회로도, 제2도는 그 밴드 변환부의 중요부분회로도로서, (A)는 입력단 동조회로, (B)는 단간(段間)동조회로, (C)는 국부발진단 동조회로 이다.1 is an overall circuit diagram of a VHF electronic tuner, which is an embodiment of the present invention, and FIG. 2 is an important partial circuit diagram of the band conversion unit, (A) an input stage tuning circuit, (B) an end-to-end tuning circuit, (C) is a local oscillation synchronization circuit.
또(1)은 고주파증폭회로의 능동소자, (2)는 국부발진단의 능동소자, (TU)는 튜우닝 전압의 입력단자, (3H)는 하이밴드용 밴드변환 전압선, (3L)은 로우밴드용 밴드변환전압선, (4H)는 하이밴드용 밴드변환진압선(3H)에 밴드 변환용 전압을 공급하는 제1밴드 변환전압단자, (4L)은 로우밴드용 밴드변환전압선(3L)에 밴드변환용 전압을 공급하는 제2밴드변환 전압단자, (5),(6),(7)은 각 동조회로 (A)(B)(C)의 가변 리액턴스 소자인 가변용량 다이오드, …(8)(8)은 각 동조회로(A)(B)(C)를 구성하는 동조 코일이다.(1) is an active element of a high frequency amplification circuit, (2) is an active element of a local oscillation stage, (TU) is an input terminal of a tuning voltage, (3H) is a high band band conversion voltage line, and (3L) is low. The band conversion voltage line for band, (4H) is the first band conversion voltage terminal for supplying the band conversion voltage to the high conversion band conversion suppression line (3H), (4L) is a band to the low-band band conversion voltage line (3L) The second band conversion voltage terminals (5), (6), and (7) for supplying the conversion voltage are variable capacitance diodes which are variable reactance elements of the tuning circuits (A), (B) and (C). (8) (8) is a tuning coil constituting each tuning circuit A (B) (C).
(9AH) 및 (9AL)은 각각 하이밴드용 및 로우밴드용 밴드 변환전압선(3H)(3L)과, 입력단 동조회로(B)의 소정위치와의 사이에 삽입 접속된 제1스위칭 다이오드이다.9AH and 9AL are first switching diodes inserted and connected between the high band and low band band conversion voltage lines 3H and 3L, respectively, and a predetermined position of the input stage tuning circuit B. In FIG.
(9BH) 및 (9BL)은 각각 하이밴드용 및 로우 밴드용 밴드변환 전압선(3H)(3L)과, 단간 동조회로 (B)의 소정위치와의 사이에 삽입. 접속된 제1스위칭 다이오드이다(9BH) and (9BL) are inserted between the high band and low band band conversion voltage lines 3H (3L) and the predetermined positions of the inter-stage tuning circuit B, respectively. Connected first switching diode
(9CH) 및 (9CL)은 각각 하이밴드용 및 로우밴드용 밴드변환 전압선(3H)(3L)과, 국부발진단 동조회로의 소정위치와의 사이에 삽입. 접속된 제1스위칭 다이오드이다.9CH and 9CL are inserted between the high band and low band band conversion voltage lines 3H and 3L, respectively, and a predetermined position of the local oscillation stage tuning circuit. Connected first switching diode.
(10)은 제2밴드 변환단자(4L)과 로우밴드용 밴드변환 전압선 (3L)과의 사이에 접속된 제2스위칭 다이오드이다.Denoted at 10 is a second switching diode connected between the second band conversion terminal 4L and the low band band conversion voltage line 3L.
본 구성에 있어서 하이밴드와 로우밴드의 밴드변환은 하이밴드용 또는 로우밴드용 밴드변환 전압선(3H)(3L)의 어느쪽을 높은 전위로 하는가에 의하여 행하여 진다.In this configuration, the band conversion between the high band and the low band is performed by which of the high band or low band band conversion voltage lines 3H and 3L is set to a high potential.
즉, 제1스위칭 다이오드(9AH)(9AL)(9BH)(9BL)(9CH)(9CL)의 각쌍은 2가닥의 밴드변환전압선 (3H)(3L)에서 각각 동조회로(A)(B)(C)로 향하는 방향으로 접속되며, 동조회로에서 직류적으로 접속되어서 어스(E)에 전류를 떨어뜨리도록 접속되어 있다.That is, each pair of the first switching diodes 9AH, 9AL, 9BH, 9BL, 9CH, and 9CL is tuned to each of the two band conversion voltage lines 3H and 3L by the tuning circuits A and B. It is connected in the direction toward (C), and is connected by direct current | flow in the tuning circuit, and is connected so that a current may fall to earth E. FIG.
이 때문에 2가닥의 밴드변환전압선(3H)(3L)중 높은 전위로 된 쪽에 접속된 제1스위칭 다이오드의 한쪽 (9AH)(9BH)(9CH) 또는 다른쪽 (9AL)(9BL)(9CL)이 도통한다.For this reason, one (9AH), 9BH, 9CH, or the other 9AL, 9BL, 9CL of the first switching diode connected to the higher potential of the two band conversion voltage lines 3H, 3L is connected. It is conducting.
그리고 제1스위칭 다이오드 (9AH)(9BH)(9CH)이 도통 하였을 때는 동조회로 (A)(B)(C)의 동조코일의 일부가 고주파적으로 단락되며, 또 제1스위칭 다이오드의 도통에 의하여 밴드변환용 전압이 능동소자(1)(2) 구동용전원으로서 공급된다When the first switching diodes 9AH, 9BH, and 9CH are conducting, a part of the tuning coils of the tuning circuits A, B, and C is shorted at high frequency, and the conduction of the first switching diode is prevented. The band conversion voltage is thereby supplied as a power source for driving the active elements 1 and 2.
이것을 제2도에서 설명한다This is illustrated in Figure 2
하이밴드용 밴드변환전압선(3H)쪽이 로우밴드용 밴드변환전압선(3L)보다 전위가 높게 되었을 때는 제1스위칭 다이오드의 한쪽 (9AH)(9BH)(9CH)이 도통하고, 다른쪽 (9AL)(9BL)(9CL)은 비도통하게 된다.When the potential of the high band band conversion voltage line 3H becomes higher than that of the low band band conversion voltage line 3L, one of the first switching diodes (9AH) (9BH) (9CH) is turned on and the other (9AL). (9BL) and 9CL become non-conductive.
그리고 능동소자(1)(2)에 구동전압이 동조코일(8)(8)…에서 공급됨과 아울러 입력단동조회로 (A)에서는 4개 직렬 접속된 동조코일(8)(8)(8)(8)중 중간의 2개를 고주파적으로 단락한다.The driving voltage is applied to the active coils 1, 2, and the tuning coils 8, 8,. In addition, the input single tuning circuit (A) short-circuits the middle two of the four tuning coils (8) (8) (8) (8) connected in series at high frequency.
또, 단간동조회로 (B)에서는 4개의 동조코일(8)(8)(8)(8)중 끝의 2개를 고주파적으로 단락한다.In the inter-stage tuning circuit B, two of the ends of the four tuning coils 8, 8, 8 and 8 are shorted at high frequency.
또, 국부발진단의 동조회로(C)에서는 2개의 동조코일(8)(8)의 한쪽을 고주파적으로 단락한다.In the tuning circuit C of the local oscillation stage, one of the two tuning coils 8 and 8 is shorted at a high frequency.
또, 로우밴드용 밴드변환전압선(3L)쪽이 하이밴드용 밴드변환전압선(3H)보다 전위가 높게 되었을 때에는 제1스위칭 다이오드의 다른쪽 (9AL)(9BL)(9CL)이 도통하고, 한쪽 (9AH)(9BH)(9CH)은 비도통하게 된다.When the potential of the low band band conversion voltage line 3L becomes higher than that of the high band band conversion voltage line 3H, the other side 9AL, 9BL, 9CL of the first switching diode conducts, and 9AH) (9BH) (9CH) becomes non-conductive.
이 경우는 각 동조회로 (A)(B)(C)의 동조코일(8)(8)…은 단락되지 않는다.In this case, the tuning coils 8, 8,... Of the respective tuning circuits A, B, C.. Is not shorted.
이와 같이하여 밴드변환이 이루어져 입력단자(TU)에서 입력되는 튜우닝 전압에 의하여 각 가변용량 다이오드(5)(6)(7)의 용량을 변화시키는 것에 의하여 하이밴드 및 로우밴드의 소망하는 동조주파수가 얻어진다In this way, band conversion is performed to change the capacitance of each of the variable capacitor diodes 5, 6, and 7 according to the tuning voltage input from the input terminal TU. Is obtained
그런데, 전압변환방식과 단자변환방식의 어느 것도 튜우너회로의 변경없이 적용하는 본고안의 목적은 제2밴드 변환단자(4L)와 밴드 변환전압선(3L)의 사이에 삽입된 제2스위칭 다이오드(10)에서 달성되어 있다.However, an object of the present invention in which neither the voltage conversion method nor the terminal conversion method is applied without changing the tuner circuit is to provide a second switching diode 10 inserted between the second band conversion terminal 4L and the band conversion voltage line 3L. ) Is achieved.
즉, 제2밴드변환단자(4L)에 인가된 밴드변환용전압(예컨데 +15V)은 제2스위칭 다이오드(10)에 있어서의 순방향 전압강하에 의하여 예컨데 약 0.7V저하 하여서 로우밴드용 밴드 변환전압선 (3L)에 부여된다.That is, the band conversion voltage (for example, + 15V) applied to the second band conversion terminal 4L is reduced by, for example, about 0.7V by the forward voltage drop of the second switching diode 10, and thus the low band band conversion voltage line. It is given to 3L.
이 때문에 다음과 같은 사용법에 의하여 2개의 밴드변환방식의 채용이 가능하게 되어 있다.Therefore, it is possible to adopt two band conversion methods by the following usage.
먼저 상기한 구성의 VHF전자 튜우너를 단자 변환방식으로서 밴드변환시키려고 할때는, 하이밴드 수신때에는 제1밴드변환단자(4H)에 밴드변환용 전압(예컨데 +15V)를 인가하고, 로우밴드 수신때에는 제2밴드 변환단자(4L)에 밴드변환용 전압(예컨데 +15V)을 인가한다.First, when the band conversion method of the VHF electronic tuner having the above-described configuration is used as the terminal conversion method, a band conversion voltage (for example, + 15V) is applied to the first band conversion terminal 4H at the time of high band reception, and a second at the time of low band reception. A band converting voltage (for example, + 15V) is applied to the band converting terminal 4L.
이때 밴드변환용 전압이 인가되지 않은 다른쪽의 밴드 변환단자(4L)(4H)는 개방상태로 되든가 또는 OV의 전위를 부여한다.At this time, the other band conversion terminals 4L and 4H to which the band conversion voltage is not applied are brought into an open state or the potential of OV is applied.
이와같이하면, 로우밴드용 밴드변환 전압선(3L)에는 약 0.7V낮은 전압이 부여되는 것으로 되는 바, 어느 쪽의 밴드변환전압선 (3H)(3L)에 밴드변환용 전압을 부여한 경우에도 전압을 가한 쪽의 밴드변환전압선(3H)(3L)쪽이 전압을 가하지 않는 쪽의 밴드변환전압선 (3H)(3L)보다도 전위가 높게 되어, 제1스위칭 다이오드(9AH)(9AL)(9BH)(9BL)(9CH)(9CL)의 도통에 의한 밴드 변환동작은 확실하게 행하여진다.In this manner, a low voltage of about 0.7 V is applied to the low band band conversion voltage line 3L, and a voltage is applied even when a band conversion voltage is applied to any of the band conversion voltage lines 3H and 3L. The band switching voltage lines 3H and 3L on the other hand have a higher potential than the band conversion voltage lines 3H and 3L on the side to which no voltage is applied, so that the first switching diodes 9AH, 9AL, 9BH, 9BL, ( The band switching operation by conduction of 9CH) 9CL is surely performed.
또한 능동소자(1)(2)에의 구동전압의 공급은 로우밴드용 밴드 변환전압선 (3L)에서 행하였을 때 쪽이 약 0.7V 낮게 되는바, 이 정도의 차는 동작상 문제는 없다.In addition, when the driving voltage is supplied to the active elements 1 and 2 by the low band band conversion voltage line 3L, the driving voltage is about 0.7V lower, and this difference does not cause an operation problem.
다음에 상기한 구성의 VHF전자튜우너를 전압 변환방식으로서 밴드변환시키려고 할때는, 제2밴드변환단자(4L)에는 B전압(예컨대 15V)선과 접속하여 그 전위를 고정하여버리고, 제1밴드 변환단자(4H)에 밴드변환용전압(예컨대 15V)를 부여하는가의 여부에 따라서 하이밴드와 로우밴드의 변환을 행하도록 한다.Next, in the case of attempting to band convert the VHF electronic tuner having the above-described configuration as the voltage conversion method, the second band conversion terminal 4L is connected to a B voltage (e.g. 15V) line to fix the potential thereof and the first band conversion terminal ( The high band and the low band are converted according to whether or not a band converting voltage (for example, 15 V) is applied to 4H).
즉, 로우밴드용 밴드변환전압선(3L)은 상기 일정전압이 낮은 전위(예컨대 14.3V)로 보전되어 있으므로, 제1밴드변환전압선(4H)에 밴드변환용 전압(예컨대 15V)를 가하 있을 때에는 하이밴드용 밴드변환전압선 (3H)쪽이 다른쪽(3L)보다도 일정전압(제2스위칭 다이오드(10)에 있어서의 순방향 전압 강하 약 0.7V)분만큼 높게 된다.That is, since the low band band conversion voltage line 3L is held at a low potential (for example, 14.3 V), the low band band conversion voltage line 3L is high when a band conversion voltage (for example, 15 V) is applied to the first band conversion voltage line 4H. The band conversion voltage line 3H for the band becomes higher than the other 3L by a constant voltage (approximately 0.7 V in the forward voltage drop in the second switching diode 10).
또 제1밴드변환단자(4H)에 밴드변환용 전압을 가하지않음(예컨대 OV로 하든가, 개방상태로 한다)때는 로우밴드용 밴드변환 전압선(4L)쪽이 전위가 일정전압(예컨데 14.3V)높게된다.When no band converting voltage is applied to the first band converting terminal 4H (e.g., OV or open), the potential of the low band converting voltage line 4L is higher than a constant voltage (e.g., 14.3V). do.
따라서 하이밴드와 로우밴드를 변환하기위하여 필요한 2가닥의 밴드변환전압선 (3H)(3L)의 전위차가 각각 생겨서 밴드 변환이 확실하게 이루어진다.Therefore, the potential difference between the two band conversion voltage lines 3H and 3L necessary for converting the high band and the low band occurs, so that band conversion is surely performed.
또 능동소자(1)(2)에의 구동전압공급도 전기한 단자변환방식의 경우와 동일하게 이루어진다.In addition, the supply of driving voltages to the active elements 1 and 2 is performed in the same manner as in the case of the terminal conversion method described above.
또한 상기한 실시예에 있어서의 제2스위칭 다이오드(10)의 순방향 전압강하는 1개분의 약 0.7V인 바, 0.7V이상의 전압강하를 부여하여 동작을 보다 확실하게 할려고 한 경우는 제3도에 표시하는 바와 같이 스위칭 다이오드(10')를 2개 직렬로 하는 등의 수단에 의하여 순방향 전압강하를 크게 하면 좋다.In addition, since the forward voltage drop of the second switching diode 10 in the above-described embodiment is about 0.7 V for one part, the operation of applying the voltage drop of 0.7 V or more to make the operation more secure is shown in FIG. As shown, the forward voltage drop may be increased by means of, for example, two switching diodes 10 'in series.
또, 상기한 실시예의 스위칭 다이오드(10)는 제2밴드변환단자(4L)와 로우밴드용 밴드변환전압선(3L)사이에 삽입,접속되었으나, 이것은 제1밴드변환단자(4H)와 하이밴드용 밴드변환전압선 (3H)사이에 삽입,접속하도록 하여도 좋다.In addition, although the switching diode 10 of the above embodiment is inserted and connected between the second band conversion terminal 4L and the low band band conversion voltage line 3L, this is for the first band conversion terminal 4H and the high band. It may be inserted and connected between the band conversion voltage lines 3H.
이상 설명한 바와 같이 본 고안에 의하면, 한쪽의 밴드변환전압선에의 밴드변환전압선의 공급과, 스위칭 다이오드를 개재하여 행하도록 하는 것만으로서, 1개의 VHF 전자 튜우너의 밴드 변환방식으로서 전압변환방식과 단자변환방식의 어느 것이나 튜우너회로의 변경없이 채용할수 있도록 된다.As described above, according to the present invention, the voltage conversion method and the terminal conversion are used as the band conversion method of one VHF electronic tuner only by supplying the band conversion voltage line to one band conversion voltage line and via a switching diode. Any of the methods can be employed without changing the tuner circuit.
따라서 이들 2종류의 밴드변환방식에 맞추어 다른 종류의 VHF 전자튜우너를 제작하거나, 튜우너회로의 회로변경을 행할 필요가 없게 되어서 원가절감이 가능하게 된다.Therefore, it is not necessary to manufacture a different type of VHF electronic tuner or change the circuit of the tuner circuit in accordance with these two types of band conversion methods, thereby enabling cost reduction.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982022287U JPS58135133U (en) | 1982-02-18 | 1982-02-18 | Electronic tuner band switching circuit |
| JP22287 | 1982-02-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR840004512U KR840004512U (en) | 1984-09-20 |
| KR900011293Y1 true KR900011293Y1 (en) | 1990-12-22 |
Family
ID=30034377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019830001437U KR900011293Y1 (en) | 1982-02-18 | 1983-02-17 | Band changing circuit of electronic tuner |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS58135133U (en) |
| KR (1) | KR900011293Y1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS515882A (en) * | 1974-07-03 | 1976-01-19 | Shindengen Electric Mfg | KEIKOTO TENTOSOCHI |
-
1982
- 1982-02-18 JP JP1982022287U patent/JPS58135133U/en active Pending
-
1983
- 1983-02-17 KR KR2019830001437U patent/KR900011293Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR840004512U (en) | 1984-09-20 |
| JPS58135133U (en) | 1983-09-10 |
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