JPS6478469A - Duplication inhibition device - Google Patents

Duplication inhibition device

Info

Publication number
JPS6478469A
JPS6478469A JP23652787A JP23652787A JPS6478469A JP S6478469 A JPS6478469 A JP S6478469A JP 23652787 A JP23652787 A JP 23652787A JP 23652787 A JP23652787 A JP 23652787A JP S6478469 A JPS6478469 A JP S6478469A
Authority
JP
Japan
Prior art keywords
duplication
amplitude
modulation
signal
music sound
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.)
Pending
Application number
JP23652787A
Other languages
Japanese (ja)
Inventor
Takanori Senoo
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP23652787A priority Critical patent/JPS6478469A/en
Priority to DE3851724T priority patent/DE3851724T2/en
Priority to EP88306101A priority patent/EP0298691B1/en
Priority to US07/216,495 priority patent/US4979210A/en
Publication of JPS6478469A publication Critical patent/JPS6478469A/en
Priority to US07/544,276 priority patent/US5073925A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00681—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which prevent a specific kind of data access
    • G11B20/00688—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which prevent a specific kind of data access said measures preventing that a usable copy of recorded data can be made on another medium
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To eliminate the lacking of an original music sound signal and to prevent mal-detection by providing an amplitude modulator and a detector to designate a duplication inhibition depending on the presence/absence of an amplitude-modulated signal. CONSTITUTION:A music sound signal inhibiting the duplication is subjected to a prescribed amplitude modulation in an amplitude modulator 1, and transmitted to a transmission medium 2. In case of reproducing said signal to duplicate it in a duplication medium 5, that the prescribed amplitude modulation is applied is detected by the detector 3, a duplicator 4 is stopped, and thus the duplication is inhibited. Since the duplication inhibition is designated depending on the presence/absence of the amplitude modulation, any lacking of an original music sound signal does not occur. Also, by making the modulation factor sufficiently small, the variation in the amplitude can be made below a level that can be noticed by a human being. By this selecting a modulation signal suitably, a mal-detection can be prevented.
JP23652787A 1987-07-08 1987-09-21 Duplication inhibition device Pending JPS6478469A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP23652787A JPS6478469A (en) 1987-09-21 1987-09-21 Duplication inhibition device
DE3851724T DE3851724T2 (en) 1987-07-08 1988-07-05 Method and device for protecting copy signals.
EP88306101A EP0298691B1 (en) 1987-07-08 1988-07-05 Method and apparatus for protection of signal copy
US07/216,495 US4979210A (en) 1987-07-08 1988-07-08 Method and apparatus for protection of signal copy
US07/544,276 US5073925A (en) 1987-07-08 1990-06-13 Method and apparatus for the protection of signal copy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23652787A JPS6478469A (en) 1987-09-21 1987-09-21 Duplication inhibition device

Publications (1)

Publication Number Publication Date
JPS6478469A true JPS6478469A (en) 1989-03-23

Family

ID=17002008

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23652787A Pending JPS6478469A (en) 1987-07-08 1987-09-21 Duplication inhibition device

Country Status (1)

Country Link
JP (1) JPS6478469A (en)

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