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특허 상세정보

Scrambling of signals by inversion

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) H04K-001/04   
미국특허분류(USC) 380/6 ; 380/19 ; 380/38
출원번호 US-0815912 (1986-01-03)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 9  인용 특허 : 16
초록

The present invention is directed to an inversion scrambler and unscrambler having pseudo-randomly controlled polarity-reversing switches to invert and re-invert, respectively, an audio signal so as to restrict the intelligent dissemination of the audio signal. To improve security of the scrambled signal, the audio signal is concealed prior to scrambling. Concealment includes clamping the original audio signal to a predetermined value and optionally offsetting this clamped signal prior to scrambling. The concealed signal is scrambled by inverting contigu...

대표
청구항

A method of scrambling a received audio signal, said method comprising the steps of: obtaining a derived signal from said received audio signal, combining said derived signal with said received audio signal to produce a combined audio signal; and inverting at least one selected portion of said combined audio signal.

이 특허에 인용된 특허 (16)

  1. Tang Danny Q. H. (Northampton PA) Yee Bark L. (Allentown PA). High security subscription television system employing real time control of subscriber\s program reception. USP1981024253114.
  2. Wong Hoi W. (Kowloon HKX) Chai Hung Y. (Taikoo Shing HKX). High security subscription television transmission system. USP1987074679078.
  3. Asakawa Shigeru (Fujisawa JPX) Nakamura Makoto (Kanagawa JPX) Sugiyama Fumio (Sagamihara JPX) Okai Tsukasa (Yokohama JPX). Security communication system. USP1981124305152.
  4. Huang Frederick (Oxford GB2). Speech scramblers. USP1988094773092.
  5. DeLong Vincent R. (Marion IA). System and method for encrypting a voice signal. USP1984044443660.
  6. Robbins Clyde N. (Fort Washington PA). Television signal encryption system with protected audio. USP1986124628358.
  7. Okada Takashi (Kanagawa JPX) Mogi Takao (Tokyo JPX) Kobayashi Hiroyuki (Tokyo JPX) Ohi Katsuyuki (Kanagawa JPX). Television signal transmission system. USP1987074679235.
  8. Osaka Hiroshi (Kodaira JPX). Television video signal scrambling system. USP1981124308556.
  9. Seiler Norman C. (West Melbourne FL). Time division multiplied speech scrambler. USP1980094221931.
  10. Pires H. George (Parlin NJ). Transient suppression and grey level coincidence in a subscription television system. USP1977054022972.
  11. Kanai Ryokichi (Toda JPX). Video cipher processing system. USP1984014429331.
  12. Papay Joseph M. (Kitchener CAX). Video clamp and inverter circuit. USP1981034257065.
  13. Robbins Clyde N. (Fort Washington PA). Video encryption system. USP1986074598318.
  14. Osaka Hiroshi (Toda JPX). Video signal processing system. USP1983084398215.
  15. Fujii Akira (Tokyo JPX) Tokunaga Tadatsugu (Tokyo JPX) Adachi Hiroaki (Tokyo JPX). Video signal transmission systems. USP1986074599648.
  16. McCalmont Arnold M. (Acton MA). Voice privacy system with amplitude masking. USP1980034195202.