CA2181691C - Method and apparatus for scrambling and descrambling of audio signals - Google Patents

Method and apparatus for scrambling and descrambling of audio signals Download PDF

Info

Publication number
CA2181691C
CA2181691C CA002181691A CA2181691A CA2181691C CA 2181691 C CA2181691 C CA 2181691C CA 002181691 A CA002181691 A CA 002181691A CA 2181691 A CA2181691 A CA 2181691A CA 2181691 C CA2181691 C CA 2181691C
Authority
CA
Canada
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.)
Expired - Fee Related
Application number
CA002181691A
Other languages
English (en)
French (fr)
Other versions
CA2181691A1 (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.)
Rovi Corp
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 CA2181691A1 publication Critical patent/CA2181691A1/en
Application granted granted Critical
Publication of CA2181691C publication Critical patent/CA2181691C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Transmitters (AREA)
CA002181691A 1993-10-26 1994-10-18 Method and apparatus for scrambling and descrambling of audio signals Expired - Fee Related CA2181691C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US14506693A 1993-10-26 1993-10-26
US145,066 1993-10-26
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
CA2181691A1 CA2181691A1 (en) 1995-05-11
CA2181691C true CA2181691C (en) 2000-10-17

Family

ID=22511456

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002181691A Expired - Fee Related CA2181691C (en) 1993-10-26 1994-10-18 Method and apparatus for scrambling and descrambling of audio signals

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)

Family Cites Families (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
AU8082894A (en) 1995-05-23
WO1995012922A2 (en) 1995-05-11
EP0744105A1 (de) 1996-11-27
NZ275269A (en) 1998-08-26
JPH10500259A (ja) 1998-01-06
DE69415555D1 (de) 1999-02-04
DK0744105T3 (da) 1999-08-23
ATE175063T1 (de) 1999-01-15
ES2125494T3 (es) 1999-03-01
AU695981B2 (en) 1998-08-27
KR100249656B1 (ko) 2000-03-15
TW311307B (de) 1997-07-21
CA2181691A1 (en) 1995-05-11
JP3150700B2 (ja) 2001-03-26
DE69415555T2 (de) 1999-05-12
HK1013747A1 (en) 1999-09-03
EP0744105B1 (de) 1998-12-23
MY111488A (en) 2000-06-30
WO1995012922A3 (en) 1995-07-13

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