KR910009089A - Spectral Inverted Analog Audio Scrambling Method and Apparatus - Google Patents

Spectral Inverted Analog Audio Scrambling Method and Apparatus Download PDF

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Publication number
KR910009089A
KR910009089A KR1019890014910A KR890014910A KR910009089A KR 910009089 A KR910009089 A KR 910009089A KR 1019890014910 A KR1019890014910 A KR 1019890014910A KR 890014910 A KR890014910 A KR 890014910A KR 910009089 A KR910009089 A KR 910009089A
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KR
South Korea
Prior art keywords
analog audio
signal
pass filter
low pass
cutoff frequency
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Application number
KR1019890014910A
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Korean (ko)
Inventor
서정식
Original Assignee
이헌조
주식회사 금성사
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Priority to KR1019890014910A priority Critical patent/KR910009089A/en
Publication of KR910009089A publication Critical patent/KR910009089A/en

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Abstract

내용 없음No content

Description

스펙트럼 도치 아나로그 오디오 스크램블링 방법 및 장치.Method and apparatus for spectral inversion analog audio scrambling.

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

제2도는 본 발명에 따른 스펙트럼 도치 아나로그 오디오 스크램블링 장치 구성 블럭도,2 is a block diagram of a spectral inverted analog audio scrambling apparatus according to the present invention;

제3도는 제2도에서 대역 통과 필터의 내부 구성 상세도,3 is a detailed view of the internal configuration of the band pass filter in FIG.

제4도는 제2도에서 저역 통과 필터의 내부 구성 상세도.4 is a detailed view of the internal construction of the low pass filter in FIG.

Claims (2)

밴드리미팅 시켜 S/N비를 증가한 증폭된 아나로그 오디오 신호(AA)를 중심주파수(fH)를 갖는 사인파를 이용하여 컷오프 주파수(fH)만큼 이동한후 컷오프주파(fH) 이상의 신호를 제거하여 도치된 형태의 스트램블 오디오 신호(SA)를 얻도록 한 것을 특징으로한 스펙트럼 도치 아나로그 오디오 스트램블링 방법.The band-amplified analog audio signal AA having an increased S / N ratio is moved by a cutoff frequency fH using a sine wave having a center frequency fH, and then inverted by removing a signal above the cutoff frequency fH. A spectral inverted analog audio scrambling method, characterized in that to obtain a scrambled audio signal SA in the form. 수평동기신호(HS)를 주기(fH)를 갖는 사인파로 만드는 대역통과필터(20)와, 오피앰프(21a)에서 증폭한 아나로그 오디오 신호(AA)를 밴드리미팅 시켜 S/N비를 증가시키는 저역통과필터(22)와, 상기 저역통과필터(22)에서 출력되는 아나로그 오디오 스펙트럼을 오피앰프(21)에서 증폭된 저역통과필터(22)의 사인파 신호에의해 컷오프 주파수(fH)만큼 이동하는 평형 변조기(23)와, 상기 평형변조기(23)에서 이동된 오디오 신호중 컷오프 주파수(fH) 이상의 신호를 제거하여 스크램블 오디오 신호(SA)를 출력하는 저역통과필터(22a)를 포함하여 구성된 것을 특징으로 하는 스펙트럼 도치 아날로그 오디오 스크램블링 장치.Band-limiting the band pass filter 20 which makes the horizontal synchronization signal HS a sine wave having a period fH, and the analog audio signal AA amplified by the op amp 21a to increase the S / N ratio. The low pass filter 22 and the analog audio spectrum output from the low pass filter 22 are shifted by the cutoff frequency fH by the sine wave signal of the low pass filter 22 amplified by the op amp 21. And a low pass filter 22a for outputting a scrambled audio signal SA by removing a signal having a cutoff frequency fH or higher among the audio signals moved by the balance modulator 23 and the balance modulator 23. Spectrum inverted analog audio scrambling device. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019890014910A 1989-10-17 1989-10-17 Spectral Inverted Analog Audio Scrambling Method and Apparatus KR910009089A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019890014910A KR910009089A (en) 1989-10-17 1989-10-17 Spectral Inverted Analog Audio Scrambling Method and Apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019890014910A KR910009089A (en) 1989-10-17 1989-10-17 Spectral Inverted Analog Audio Scrambling Method and Apparatus

Publications (1)

Publication Number Publication Date
KR910009089A true KR910009089A (en) 1991-05-31

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KR (1) KR910009089A (en)

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