AU695981B2 - Method and apparatus for low cost audio scrambling and descrambling - Google Patents

Method and apparatus for low cost audio scrambling and descrambling

Info

Publication number
AU695981B2
AU695981B2 AU80828/94A AU8082894A AU695981B2 AU 695981 B2 AU695981 B2 AU 695981B2 AU 80828/94 A AU80828/94 A AU 80828/94A AU 8082894 A AU8082894 A AU 8082894A AU 695981 B2 AU695981 B2 AU 695981B2
Authority
AU
Australia
Prior art keywords
frequency
signal
modulation
sideband signal
modulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU80828/94A
Other languages
English (en)
Other versions
AU8082894A (en
Inventor
Ronald Quan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Adeia Media LLC
Original Assignee
Macrovision Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Macrovision Corp filed Critical Macrovision Corp
Publication of AU8082894A publication Critical patent/AU8082894A/en
Application granted granted Critical
Publication of AU695981B2 publication Critical patent/AU695981B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplitude Modulation (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)
  • Noise Elimination (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Transmitters (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
AU80828/94A 1993-10-26 1994-10-18 Method and apparatus for low cost audio scrambling and descrambling Ceased AU695981B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US14506693A 1993-10-26 1993-10-26
US145066 1993-12-14
PCT/US1994/011891 WO1995012922A2 (en) 1993-10-26 1994-10-18 Method and apparatus for low cost audio scrambling and descrambling

Publications (2)

Publication Number Publication Date
AU8082894A AU8082894A (en) 1995-05-23
AU695981B2 true AU695981B2 (en) 1998-08-27

Family

ID=22511456

Family Applications (1)

Application Number Title Priority Date Filing Date
AU80828/94A Ceased AU695981B2 (en) 1993-10-26 1994-10-18 Method and apparatus for low cost audio scrambling and descrambling

Country Status (14)

Country Link
EP (1) EP0744105B1 (de)
JP (1) JP3150700B2 (de)
KR (1) KR100249656B1 (de)
AT (1) ATE175063T1 (de)
AU (1) AU695981B2 (de)
CA (1) CA2181691C (de)
DE (1) DE69415555T2 (de)
DK (1) DK0744105T3 (de)
ES (1) ES2125494T3 (de)
HK (1) HK1013747A1 (de)
MY (1) MY111488A (de)
NZ (1) NZ275269A (de)
TW (1) TW311307B (de)
WO (1) WO1995012922A2 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636853A (en) * 1983-12-21 1987-01-13 Zenith Electronics Corporation Dynamic audio scrambling system
US5058159A (en) * 1989-06-15 1991-10-15 Macrovision Corporation Method and system for scrambling and descrambling audio information signals
US5159631A (en) * 1990-04-26 1992-10-27 Macrovision Corporation Audio scrambling system using in-band carrier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636853A (en) * 1983-12-21 1987-01-13 Zenith Electronics Corporation Dynamic audio scrambling system
US5058159A (en) * 1989-06-15 1991-10-15 Macrovision Corporation Method and system for scrambling and descrambling audio information signals
US5159631A (en) * 1990-04-26 1992-10-27 Macrovision Corporation Audio scrambling system using in-band carrier

Also Published As

Publication number Publication date
DE69415555D1 (de) 1999-02-04
ES2125494T3 (es) 1999-03-01
DE69415555T2 (de) 1999-05-12
ATE175063T1 (de) 1999-01-15
TW311307B (de) 1997-07-21
CA2181691A1 (en) 1995-05-11
AU8082894A (en) 1995-05-23
DK0744105T3 (da) 1999-08-23
MY111488A (en) 2000-06-30
EP0744105B1 (de) 1998-12-23
WO1995012922A3 (en) 1995-07-13
WO1995012922A2 (en) 1995-05-11
JPH10500259A (ja) 1998-01-06
KR100249656B1 (ko) 2000-03-15
JP3150700B2 (ja) 2001-03-26
HK1013747A1 (en) 1999-09-03
NZ275269A (en) 1998-08-26
EP0744105A1 (de) 1996-11-27
CA2181691C (en) 2000-10-17

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Legal Events

Date Code Title Description
MK14 Patent ceased section 143(a) (annual fees not paid) or expired