KR950008534Y1 - Tunor for multi channel type - Google Patents
Tunor for multi channel type Download PDFInfo
- Publication number
- KR950008534Y1 KR950008534Y1 KR2019890021333U KR890021333U KR950008534Y1 KR 950008534 Y1 KR950008534 Y1 KR 950008534Y1 KR 2019890021333 U KR2019890021333 U KR 2019890021333U KR 890021333 U KR890021333 U KR 890021333U KR 950008534 Y1 KR950008534 Y1 KR 950008534Y1
- Authority
- KR
- South Korea
- Prior art keywords
- signal
- tuner
- channel
- tuning
- broadcast signal
- Prior art date
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
-
- 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)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안에 따른 다중채널용 튜너의 구성을 보이는 블럭도이다.1 is a block diagram showing the configuration of a multi-channel tuner according to the present invention.
제2도는 제1도에 도시된 장치의 동작을 보이는 파형도이다.FIG. 2 is a waveform diagram showing the operation of the apparatus shown in FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 제어부 20 : RF변환부10: control unit 20: RF conversion unit
30 : 동조부 40 : 복조부30: tuning unit 40: demodulation unit
본 고안은 텔레비젼 신호를 수신하게 하는 튜너에 관한 것으로서 더욱 상세하게는 통상의 텔레비젼 수신용 튜너에 적용되어 케이블 텔레비젼 등의 확장된 채널의 방송신호를 수신하게 하는 다중채널용 튜너에 관한 것이다.The present invention relates to a tuner for receiving a television signal, and more particularly, to a multi-channel tuner applied to a conventional television receiving tuner to receive a broadcast signal of an extended channel such as a cable television.
일반적으로 텔레비젼 수신기는 VHF(Very High Frequency)용 튜너와 UHF(Ultra High Frequency)용 튜너를 내장하고 있다.Typically, television receivers have built-in tuners for Very High Frequency (VHF) and Ultra High Frequency (UHF).
VHF신호를 수신할 때는 VHF용 튜너만이 동작하고, UHF신호를 수신할 때는 UHF용 튜너의 고주파 증폭회로와 주파수변환회로는 중간주파 증폭회로의 일부로 동작하고 국부발진회로는 동작을 정지하여 UHF용 튜너에서 출력되는 중간주파출력을 복조하게 된다.When receiving the VHF signal, only the VHF tuner operates. When receiving the UHF signal, the high frequency amplification circuit and the frequency conversion circuit of the UHF tuner operate as part of the intermediate frequency amplification circuit, and the local oscillation circuit stops the operation. It will demodulate the intermediate frequency output from the tuner.
상기와 같이 동작하는 튜너는 당해 지역의 방송 시스템에 적합하게 설계되어져 있기 때문에 방송시스템이 상이하게 되거나 케이블 텔레비젼의 도입등에 의해 채널이 확장되는 경우에 대해 전혀 대응하지 못한다는 문제점이 있다.Since the tuner operating as described above is designed for a broadcasting system in the region, there is a problem in that the broadcasting system is different from each other or the channel is expanded due to the introduction of cable television.
따라서, 본 고안은 상기의 문제점을 해결하기 위하여 안출된 것으로서 방송시스템이 상이하게 되거나 채널이 확장되는 경우에 의해 발생된 방송신호를 기존의 텔레비젼 수상기에서 받아들일 수 있는 채널의 방송신호로 변환시켜 출력함으로써 기존의 텔레비젼 수상기로도 변경되거나 확장된 채널의 신호를 수신할 수 있게 하는 다중채널용 튜너를 제공하는 것을 그 목적으로 한다.Therefore, the present invention is designed to solve the above problems, and converts and outputs a broadcast signal generated by a different broadcasting system or a channel expansion into a broadcast signal of a channel that can be accepted by a conventional television receiver. It is an object of the present invention to provide a multi-channel tuner that can receive a signal of a modified or extended channel even with an existing television receiver.
상기의 목적을 달성하는 본 고안에 따른 다중채널용 튜너는 케이블 텔레비젼 등의 확장된 채널의 방송신호를 선국하고 소정의 주파수를 갖는 중간주파신호로 변환시켜 출력하는 동조부; 동주부에서 출력되는 중간주파신호를 유입하여 복조된 영상신호를 출력하는 복조부; 복주부에서 출력되는 복조된 영상신호를 채널 3/4의 방송신호로 변환시켜 출력하는 RF컨버터; 및 동주부에서 제공되는 자동미세튜닝신호를 유입하여 동주부의 출력동작을 제어하는 제어부를 구비한다. 이하 첨부된 도면을 참조하여 본 고안을 상세히 설명한다.A multi-channel tuner according to the present invention for achieving the above object is a tuning unit for tuning the broadcast signal of the extended channel, such as cable television and the like converted to an intermediate frequency signal having a predetermined frequency; A demodulation unit for inputting an intermediate frequency signal output from the moving unit and outputting a demodulated video signal; An RF converter for converting the demodulated video signal output from the demodulator to a broadcast signal of channel 3/4; And a control unit which controls the output operation of the moving unit by introducing an automatic fine tuning signal provided from the moving unit. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 고안에 따른 다중채널용 튜너의 바람직한 실시예를 보이는 블럭도이다. 제1도에 도시된 장치는 케이블 텔레비젼 등의 확장된 채널의 방송신호를 선국하고 소정의 주파수를 갖는 중간주파신호로 변환시켜 출력하는 동조부(30), 동주부(30)에서 출력되는 중간주파신호를 유입하여 복조된 영상신호를 출력하는 복조부(40), 복조부(40)에서 출력되는 복조된 영상신호를 채널 3/4의 방송신호로 변환시켜 출력하는 RF컨버터(20), 그리고 동조부(30)에서 제공되는 자동미세튜닝신호를 유입하여 동조부(30)의 출력동작을 제어하는 제어부(10)을 구비한다.1 is a block diagram showing a preferred embodiment of a multi-channel tuner according to the present invention. The apparatus shown in FIG. 1 tunes a broadcast signal of an extended channel such as a cable television and converts it into an intermediate frequency signal having a predetermined frequency and outputs the tuner 30 and the intermediate frequency output from the tuner 30. A demodulator 40 for inputting a signal and outputting a demodulated video signal, an RF converter 20 for converting the demodulated video signal output from the demodulator 40 into a broadcast signal of channel 3/4, and tuning And a control unit 10 for controlling an output operation of the tuning unit 30 by introducing an automatic fine tuning signal provided from the unit 30.
제1도에 도시된 장치의 동작을 상세히 설명한다. 주지하는 바와 같이 튜너의 국부발진회로는 자동적인 미세튜닝조정이 가능하도록 AFT(Auto Fine Tuning)회로를 부가하고 있다.The operation of the apparatus shown in FIG. 1 will be described in detail. As is well known, the local oscillation circuit of the tuner adds an AFT (Auto Fine Tuning) circuit to enable automatic fine tuning adjustment.
이러한 AFT회로는 영상중간주파 증폭단에서 얻어지는 소정주파수(한국의 경우 45.75MHz)의 영상중간주파신호를 증폭한 다음 리미터회로를 통하여 진폭을 일정하게 하고, 중심주파수가 45.75MHz에 조정되어져 있는 FM검파기를 통하여 영상중간주파신호의 주파수변동에 대응하는 FM검파출력을 얻고, 이를 직류증폭기로 증폭한 다음 국부발진회로에 연결된 가변용량 다이오드에 공급하도록 구성되어져 있다.The AFT circuit amplifies the image intermediate frequency signal of a predetermined frequency (45.75 MHz in Korea) obtained from the image intermediate frequency amplifier stage, and then sets the amplitude constant through the limiter circuit, and the FM detector whose center frequency is adjusted to 45.75 MHz. It is configured to obtain the FM detection output corresponding to the frequency variation of the image intermediate frequency signal, amplify it with a DC amplifier, and supply it to the variable capacitance diode connected to the local oscillation circuit.
전압변동 혹은 온도변화 등으로 인하여 국부발진기의 발진주파수가 높아지면 FM검파기에서 출력되는 증가된 직류전압에 의해 가변용량 다이오드의 역방향 전압을 증가시켜 결과적으로 국부발진기의 발진주파수를 낮추도록 동작한다.If the oscillation frequency of the local oscillator increases due to voltage fluctuations or temperature changes, the reverse voltage of the variable capacitance diode is increased by the increased DC voltage output from the FM detector, and as a result, the oscillation frequency of the local oscillator is lowered.
동조부(30)는 그에 내장된 ATF회로에서 발생된 ATF신호를 제어부(10)로 출력한다. ATF신호는 동조부(30)이 AFT동작상태에 있는 지의 여부를 나타내는 신호로서 국부발진기의 주파수가 AFT동작범위에 있으면(capture in상태이면) 예를 들면 제2a도에 도시되는 바와 같이 로우레벨을 유지하는 바이너리신호이다.The tuning unit 30 outputs the ATF signal generated from the ATF circuit embedded therein to the control unit 10. The ATF signal is a signal indicating whether the tuning unit 30 is in the AFT operating state. When the frequency of the local oscillator is within the AFT operating range (when captured in), for example, as shown in FIG. The binary signal to hold.
제어부(10)는 동조부(30)에서 인가되는 AFT신호가 로우레벨이 되면 예를 들면 제2b도에 도시되는 바와 같이 로우레벨을 유지하는 스트로브신호를 동조부(30)로 출력한다.When the AFT signal applied from the tuning unit 30 becomes low level, for example, as shown in FIG. 2B, the control unit 10 outputs the strobe signal maintaining the low level to the tuning unit 30.
동조부(30)은 그에 제공되는 스트로부신호가 로우레벨이 되면 중간주파신호를 복조부(40)로 출력한다.The tuner 30 outputs the intermediate frequency signal to the demodulator 40 when the straw signal provided thereto becomes low.
복조부(40)를 통하여 복조된 영상신호는 다시 RF컨버터(20)를 통하여 채널 3/4의 방송신호로 변조되어 출력된다.The demodulated video signal demodulated through the demodulator 40 is modulated into a broadcast signal of channel 3/4 through the RF converter 20 and outputted.
RF컨버터(20)에서 출력되는 방송신호는 텔레비젼 수상기의 RF입력단자에 제공된다. 따라서 텔레비젼 수상기를 채널 3/4에 맞추어두면 변경된 혹은 확장된 채널의 방송신호를 수신할 수 있게 된다.The broadcast signal output from the RF converter 20 is provided to the RF input terminal of the television receiver. Therefore, if the television receiver is tuned to channel 3/4, it is possible to receive broadcast signals of modified or extended channels.
상술한 바와 같이 본 고안에 따른 다중채널용 튜너는 변경된 혹은 확장된 채널의 방송신호를 일반의 텔레비젼 수상기에서 수신할 수 있는 채널의 방송신호로 변환시켜 줌으로써 일반의 텔레비젼 수상기로도 변경된 혹은 확장된 채널의 방송신호를 수신할 수 있게 하는 효과를 갖는다.As described above, the multi-channel tuner according to the present invention converts a broadcast signal of a changed or extended channel into a broadcast signal of a channel that can be received by a general television receiver, thereby changing or extending the channel to a general television receiver. It is effective to receive a broadcast signal of.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890021333U KR950008534Y1 (en) | 1989-12-31 | 1989-12-31 | Tunor for multi channel type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890021333U KR950008534Y1 (en) | 1989-12-31 | 1989-12-31 | Tunor for multi channel type |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910013255U KR910013255U (en) | 1991-07-30 |
| KR950008534Y1 true KR950008534Y1 (en) | 1995-10-11 |
Family
ID=19295021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019890021333U KR950008534Y1 (en) | 1989-12-31 | 1989-12-31 | Tunor for multi channel type |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR950008534Y1 (en) |
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1989
- 1989-12-31 KR KR2019890021333U patent/KR950008534Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR910013255U (en) | 1991-07-30 |
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