KR920005102A - Method and apparatus of analog audio scrambling by inversion - Google Patents

Method and apparatus of analog audio scrambling by inversion Download PDF

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Publication number
KR920005102A
KR920005102A KR1019900013125A KR900013125A KR920005102A KR 920005102 A KR920005102 A KR 920005102A KR 1019900013125 A KR1019900013125 A KR 1019900013125A KR 900013125 A KR900013125 A KR 900013125A KR 920005102 A KR920005102 A KR 920005102A
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KR
South Korea
Prior art keywords
signal
lpf
output
horizontal synchronous
bpf
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KR1019900013125A
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Korean (ko)
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KR920009639B1 (en
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서정식
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이헌조
주식회사 금성사
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Priority to KR1019900013125A priority Critical patent/KR920009639B1/en
Publication of KR920005102A publication Critical patent/KR920005102A/en
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Publication of KR920009639B1 publication Critical patent/KR920009639B1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

내용 없음.No content.

Description

인버젼에 의한 아나로그 오디오 스크램블링 방법 및 장치Method and apparatus of analog audio scrambling by inversion

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 종래의 장치 블록도.1 is a conventional device block diagram.

제2도는 본 발명에 따른 장치 블록도2 is a device block diagram according to the present invention.

제3도는 제2도에서 요부 출력 파형도.3 is a main output waveform diagram in FIG.

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

1 : 수평동기신호 분리기 2,8 : BPF1: Horizontal Sync Signal Separator 2,8: BPF

3 : 캐리어 랜덤위상 발생기 4 : 위상쉬프터3: carrier random phase generator 4: phase shifter

5,6,11 : LPF 7,9 : 밸런스 모듈레이터5,6,11: LPF 7,9: Balance Modulator

10 : 가산기10: adder

Claims (2)

합성 비데오신호로부터 수평동기신호를 분리하여 중심주파수가 fH인 랜덤 위상을 가진 사인파와 코사인파를 발생하고, 아나로그신호를 2개의 부분으로 나눈 후 각각 상기 사인파와 코사인파로 QAM하여 fH만큼 스펙트럼을 쉬프팅 시키고 이를 다시 합하여 컷오프 주파수를 fH로 밴드리미팅시켜 스크램블된 아나로그 신호를 얻도록한 인버젼에 의한 아나로그 오디오 스크램블링 방법.Separating the horizontal synchronous signal from the synthesized video signal to generate a sine wave and cosine wave having a random phase with a center frequency of fH, divide the analog signal into two parts, and then QAM the sine and cosine waves respectively to shift the spectrum by fH. And resuming the bands and band limiting the cutoff frequency to fH to obtain a scrambled analog signal. 합성 비데오신호로부터 수평동기신호를 분리해내는 수평동기신호 분리기(1)와, 상기 수평동기신호 분리기(1)에서 분리된 수평동기신호의 중심주파수가 fH가 되도록 밴드 패스시키는 BPF(2)와, 상기 BPF(2)의 출력을 입력받아 fH 주파수의 사인파를 발생시키는 랜덤 위상 발생기(3)와, 상기 랜덤 위상 발생기(3)의 출력을 90°쉬프트시켜 코사인파를 발생시키는 위상 쉬프터(4)와, 아나로그 오디오신호의 컷오프 주파수를 fH로 밴드리미팅시키는 LPF(5)와, 상기 LPF(5)의 출력을 2개의 부분으로 나누는 LPF(6) 및 BPF(8)와, 상기 LPF(6) 및 BPF(8)에서 나누어진 2개의 스펙트럼을 랜덤 위상 발생기(3)와 위상 쉬프터(4)에서 출력되는 사인파와 코사인파로 QAM하는 밸런스 모듈(7)(9)와, 상기 밸러스 모듈레이터(7)(9)에서 QAM된 신호를 더하는 가산기(10)와 상기 가산기(10)에서 출력되는 신호의 컷오프 주파수가 fH가 되도록 하는 LPF(11)로 구성되어 쿼드래틱 스펙트럼 인버젼에 의해서 아나로그 방식으로 스크램블링을 거는 인버젼에 의한 아나로그 오디오 스크램블링 장치.A horizontal synchronous signal separator (1) for separating the horizontal synchronous signal from the synthesized video signal, a BPF (2) for band passing such that the center frequency of the horizontal synchronous signal separated from the horizontal synchronous signal separator (1) becomes fH, and A random phase generator 3 that receives the output of the BPF 2 and generates a sine wave at an fH frequency, a phase shifter 4 which generates a cosine wave by shifting the output of the random phase generator 3 by 90 degrees; LPF (5) for band limiting the cutoff frequency of the analog audio signal to fH, LPF (6) and BPF (8) for dividing the output of the LPF (5) into two parts, the LPF (6) and A balance module (7) (9) and a balance modulator (7) (9) for QAM of two spectra divided by the BPF (8) with a sine wave and a cosine wave output from the random phase generator (3) and the phase shifter (4). The adder 10 and the output from the adder 10 to add the QAM signal from the An analog audio scrambling apparatus according to inversion, which is composed of an LPF (11) such that the cutoff frequency of the signal is fH, and is subjected to analog scrambling by quadratic spectrum inversion. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019900013125A 1990-08-24 1990-08-24 Analog audio scrambling method and apparatus by using inversion KR920009639B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900013125A KR920009639B1 (en) 1990-08-24 1990-08-24 Analog audio scrambling method and apparatus by using inversion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019900013125A KR920009639B1 (en) 1990-08-24 1990-08-24 Analog audio scrambling method and apparatus by using inversion

Publications (2)

Publication Number Publication Date
KR920005102A true KR920005102A (en) 1992-03-28
KR920009639B1 KR920009639B1 (en) 1992-10-22

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KR1019900013125A KR920009639B1 (en) 1990-08-24 1990-08-24 Analog audio scrambling method and apparatus by using inversion

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