KR960010498B1 - Frequency division tuning method without method selection switch - Google Patents

Frequency division tuning method without method selection switch Download PDF

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Publication number
KR960010498B1
KR960010498B1 KR1019880016037A KR880016037A KR960010498B1 KR 960010498 B1 KR960010498 B1 KR 960010498B1 KR 1019880016037 A KR1019880016037 A KR 1019880016037A KR 880016037 A KR880016037 A KR 880016037A KR 960010498 B1 KR960010498 B1 KR 960010498B1
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South Korea
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tuning
frequency division
cable
frequency
mode
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KR1019880016037A
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Korean (ko)
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KR900008877A (en
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김상일
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엘지전자 주식회사
구자홍
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Television Receiver Circuits (AREA)

Abstract

determining whether the mode is a CATV frequency tuning mode or a common TV frequency tuning mode; and outputting a tuning data by sequentially performing a number of defined tuning modes when the mode is the CATV frequency tuning mode. The method reduces unit price of CATV and provides a convenience by calculating selective switch according to HRC, STD, and IRC types.

Description

케이블 티브이의 방식 선택스위치를 삭제한 주파수 분할 튜닝방식Frequency division tuning method without cable TV selection switch

제1도는 종래 케이블 티브이의 방식 선택스위치를 이용한 주파수 분할 튜닝에 대한 신호 흐름도.1 is a signal flow diagram for frequency division tuning using a conventional type TV select switch.

제2도는 본 발명 주파수 분할 튜닝에 대한 블럭도.2 is a block diagram of frequency division tuning of the present invention.

제3도는 본 발명 케이블 티브이의 방식 선택스위치를 삭제한 주파수 분할 튜닝에 대한 신호 흐름도.3 is a signal flow diagram for frequency division tuning in which the method selection switch of the cable TV of the present invention is deleted.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 마이콤 12 : 위상비교기1: micom 12: phase comparator

3 : 프리스케일러 4 : 국부발진기3: prescaler 4: local oscillator

5 : 튜너 6 : 저역필터5: tuner 6: low pass filter

7 : 튜닝 콘트롤러 8 : 영상검파기7: Tuning Controller 8: Image Detector

9 : AFT 출력부 10 : 동기검출기9: AFT output unit 10: Synchronous detector

A1 : 안테나A1: antenna

본 발명은 주파수 분할, 튜닝방법에 관한 것으로, 특히 케이블 티브이(CATV)의 STD(Standard Frequencies), HRC(Harmonic Related Carriers), IRC(Incremental Related Carriers) 방식 선택용 스위치를 삭제하고, 한번의 선택으로 케이블 티브이의 각 방식을 선택하도록 한 케이블 티브이의 방식 선택 스위치를 삭제한 주파수 분할 튜닝방식에 관한 것이다.The present invention relates to a frequency division and tuning method, and in particular, a switch for selecting STD (Harmonic Related Carriers), IRC (Incremental Related Carriers) method of cable TV (CATV), The present invention relates to a frequency division tuning method in which a cable TV type selection switch is selected to select each type of cable TV.

종래의 케이블 티브이의 방식 선택스위치를 이용한 주파수 분할 튜닝은 제1도의 신호흐름도에 나타낸 바와같이, 케이블 TV 모드를 선택한 상태에서 케이블 TV의 HRC, STD, IRC 방식 선택 스위치 상태를 판별한다.In the conventional frequency division tuning using the cable TV type selection switch, as shown in the signal flow diagram of FIG. 1, the state of the HRC, STD, IRC type selection switch of the cable TV is determined with the cable TV mode selected.

이때 HRC방식으로 판별되는 경우에는 주파수를 각 채널의 국부 발진주파수(fc)-1.25MHz로 한 후 동기, 자동미동조(AFT)가 수행되지 않으면, 상기 fc-1.25MHz로 되는 주파수 데이타를 출력하며, 수행되면(fc-1.25HMz)±α(여기서 α는 AFT의 서치 동작에 의해 이조된 주파수량)으로 되는 주파수 데이타를 출력한다.At this time, if it is determined by the HRC method, the frequency is set to the local oscillation frequency (f c ) -1.25 MHz of each channel, and if synchronization and auto-tuning (AFT) are not performed, the frequency data of f c -1.25 MHz is obtained. And outputs frequency data, which is (f c -1.25HMz), where ± α (where α is the amount of frequency synthesized by the search operation of the AFT).

또한, STD 방식으로 판별되는 경우에는 주파수를 각 채널의 국부발진주파수(fc)로 한 후 동기, AFT가 수행되지 않으면 상기 fc로 되는 주파수 데이터를 출력하며, 수행되면 fc±α로 되는 주파수 데이터를 출력한다.Further, if it is determined by STD method, if after a frequency to the local oscillator frequency (f c) of each channel synchronization, AFT is not performed outputs the frequency data to the f c and when performing that as f c ± α Output frequency data.

그리고 IRC 방식으로 판별되는 경우에는 주파수를 fc±2MHz로 한 후 동기, AFT가 수행되지 않으면 상기 fc±2MHz로 되는 주파수 데이터를 출력하며, 수행되면(fc±2MHz)±α로 되는 주파수 데이터를 출력한다.And if it is determined by IRC method, then the frequency to f c ± 2MHz synchronization, if the AFT is not performed outputs the frequency data to the f c ± 2MHz, and, when performed (f c ± 2MHz) frequency as ± α Output the data.

그런데 상기와 같은 종래의 분할 주파수 튜닝에 있어서는 케이블 TV의 각 방식을 선택함에 있어서, 각각의 스위치를 이용하여 선택하므로 사용자에게 불편을 주게 되고 그의 구성이 복잡하게 되는 결함이 있었다.However, in the conventional divided frequency tuning as described above, in selecting each method of the cable TV, the respective switches are selected using the respective switches, which causes inconvenience to the user and has a complicated structure.

본 발명은 이와같은 종래의 결함을 감안하여, 케이블 TV/TV의 유무만 판별한 후 케이블 TV의 모드 선택시 그 케이블 TV의 각 튜닝방식을 순차적으로 선택하게 함으로써 사용자에게 편리함을 제공하도록 한 케이블 티브이의 방식 선택스위치를 삭제한 주파수 분할 튜닝 방식을 창안한 것으로, 이를 첨부한 도면에 의해 상세히 설명하면 다음과 같다.In view of the above-described deficiencies of the present invention, the cable TV is provided to provide convenience to the user by determining only the presence or absence of cable TV / TV and sequentially selecting each tuning method of the cable TV when selecting a mode of the cable TV. Invented a frequency division tuning method in which the method selection switch of the present invention is deleted.

제2도는 본 발명 주파수 튜닝에 대한 블록도로서 이에 도시한 바와같이, 케이블 TV/TV, 채널 다운, 채널업, 자동서치등의 스위치를 스캔하는 튜닝용 마이콤(1)의 튜닝출력이 위상비교기(2)를 통과한 후 저역필터(6), 튜닝 콘트롤러(7)를 통해 튜너(5)를 제어하여 안테나(A1)로부터의 방송신호를 튜닝하며, 국부발진기(4), 프리스케일러(RRESCALER)(3)를 통해 상기 위상비교기(2)에 궤환되고, 상기 튜너(5)의 출력은 영상검파기(8)을 통과한 후 튜너 비디오를 출력함과 아울러 AFT 출력부(9), 동기 검출기(10)를 통해 상기 마이콤(1)에 튜닝데이타 콘트롤 신호를 인가하게 구성한 것이다.2 is a block diagram of the frequency tuning of the present invention. As shown in FIG. 2, the tuning output of the tuning micom 1 for scanning a switch such as cable TV / TV, channel down, channel up, auto search, etc. After passing through 2), the tuner 5 is controlled by the low pass filter 6 and the tuning controller 7 to tune the broadcast signal from the antenna A1, and the local oscillator 4 and the RRESCALER 3 ) Is fed back to the phase comparator 2, and the output of the tuner 5 passes through the image detector 8, and then outputs a tuner video, and the AFT output unit 9 and the sync detector 10. It is configured to apply the tuning data control signal to the microcomputer (1) through.

이와같이 구성된 본 발명을 주파수 분할 튜닝에 대한 신호 흐름도인 제3도에 의해 설명하면 다음과 같다.Referring to FIG. 3, which is a signal flow diagram for frequency division tuning, the present invention configured as described above is as follows.

우선 케이블 TV 모드를 선택한 상태에서 fc-1.25MHz의 주파수로 되는 HRC 방식 데이터를 출력한 후 동기, AFT가 수행되면, (fc-1.25MHz)±α 튜닝 데이터를 출력하며, 수행되지 않으면 fc의 주파수로 되는 STD 방식 데이터를 출력한다.First, output the HRC method data with the frequency of f c -1.25MHz with the cable TV mode selected, and then output the (f c -1.25MHz) ± α tuning data if synchronous or AFT is performed. Outputs STD system data having a frequency of c .

이때 동기, AFT가 수행되면 fc±α 튜닝데이타를 출력하며, 수행되지 않으면 fc±2MHz의 주파수로 되는 IRC 방식 데이터를 출력한다.At this time, if synchronous or AFT is performed, f c ± α tuning data is outputted. If not, IRC method data having a frequency of f c ± 2 MHz is output.

여기서 동기, AFT가 수행되면 (fc±2MHz)±α 튜닝 데이터를 출력하며, 수행되지 않으면 fc-1.25MHz 튜닝 데이터를 출력한다.Here, if synchronous or AFT is performed, (f c ± 2 MHz) ± α tuning data is output, otherwise f c -1.25 MHz tuning data is output.

따라서 케이블 TV/TV 모드를 선택한 후 케이블 TV 모드 선택시 순차적으로 HRC, STD, IRC 방식이 스캔되어 수행된다.Therefore, after selecting the cable TV / TV mode, the HRC, STD, and IRC methods are sequentially scanned when the cable TV mode is selected.

이상에서 상세히 설명한 바와같이 본 발명은 주파수 분할 튜닝 시스템의 수행시 케이블 TV의 HRC, STD, IRC 방식 선택스위치가 계산되므로 사용자에게 편리함을 제공할 뿐아니라 그의 구성이 간단해지고, 제품의 단가를 절감할 수 있는 효과가 있다.As described in detail above, the present invention not only provides convenience to the user because the HRC, STD, and IRC type selection switches of the cable TV are calculated when the frequency division tuning system is executed, and the configuration thereof is simplified, and the cost of the product can be reduced. It can be effective.

Claims (2)

케이블 티브이 대역을 수신가능한 방송 수신기의 주파수 분할 튜닝방식에 있어서, 케이블 티브이 대역 튜닝 모드인지 일반 티브이 대역 튜닝모드인지를 판단하는 제1단계와, 상기 제1단계에서 케이블 대역 튜닝 모드이면 미리 지정된 복수개의 튜닝방식을 순차적으로 수행하여 튜닝 데이터를 출력하는 제2단계로 이루어진 것을 특징으로 하는 케이블 티브이의 방식 선택스위치를 삭제한 주파수 분할 튜닝방식.A frequency division tuning method of a broadcast receiver capable of receiving cable TV bands, the method comprising: a first step of determining whether the cable TV band tuning mode or the general TV band tuning mode; And a second step of outputting the tuning data by sequentially performing the tuning method. 제1항에 있어서, 제2단계는 HRC 방식, STD 방식, IRC 방식 순서로 튜닝동작을 수행하는 것을 특징으로 하는 케이블 티브이의 방식 선택스위치를 삭제한 주파수 분할 튜닝방식.2. The frequency division tuning method of claim 1, wherein the second step is to perform the tuning operation in the order of the HRC method, the STD method, and the IRC method.
KR1019880016037A 1988-11-30 1988-11-30 Frequency division tuning method without method selection switch KR960010498B1 (en)

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