JPS57113404A - Signal secrecy maintaining device - Google Patents

Signal secrecy maintaining device

Info

Publication number
JPS57113404A
JPS57113404A JP18624480A JP18624480A JPS57113404A JP S57113404 A JPS57113404 A JP S57113404A JP 18624480 A JP18624480 A JP 18624480A JP 18624480 A JP18624480 A JP 18624480A JP S57113404 A JPS57113404 A JP S57113404A
Authority
JP
Japan
Prior art keywords
signal
secrecy
code signal
restoration
format
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
JP18624480A
Other languages
Japanese (ja)
Inventor
Kazushige Matsuyama
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP18624480A priority Critical patent/JPS57113404A/en
Publication of JPS57113404A publication Critical patent/JPS57113404A/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

Abstract

PURPOSE:To obtain a cassette tape recorder, etc., which has convenient secrecy maintaining performance, by switching analog recording on a standard system, signal secrecy maintenance procedure, and explanation restoration by a code signal. CONSTITUTION:When changeover switches Sb1 and Sb2 are changed over to the side of a secret-word making circuit block 16, signal conversion and restoration are performed at need, and the format of a signal on a recording tape 8 is changed into a format which can not be interpreted by a general device. Those switches Sb1 and Sb2 are set in accordance with a logical value supplied by an FF15. This FF15 is set or reset by the output of a code signal detecting circuit 14. Further, a similar code signal is inputted from a microphone 1 or AUX input 2 during recording to enabe said operation. Therefore, the operation mode is controlled by receiving the code signal externally.
JP18624480A 1980-12-30 1980-12-30 Signal secrecy maintaining device Pending JPS57113404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18624480A JPS57113404A (en) 1980-12-30 1980-12-30 Signal secrecy maintaining device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18624480A JPS57113404A (en) 1980-12-30 1980-12-30 Signal secrecy maintaining device

Publications (1)

Publication Number Publication Date
JPS57113404A true JPS57113404A (en) 1982-07-14

Family

ID=16184866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18624480A Pending JPS57113404A (en) 1980-12-30 1980-12-30 Signal secrecy maintaining device

Country Status (1)

Country Link
JP (1) JPS57113404A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59122254A (en) * 1982-12-28 1984-07-14 Toshiba Corp Protecting method of data

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53136404A (en) * 1977-05-02 1978-11-29 Motorola Inc Digital audio protecting system and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53136404A (en) * 1977-05-02 1978-11-29 Motorola Inc Digital audio protecting system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59122254A (en) * 1982-12-28 1984-07-14 Toshiba Corp Protecting method of data
JPH0218621B2 (en) * 1982-12-28 1990-04-26 Tokyo Shibaura Electric Co

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