Apparatus and method for synthesizing information signal and reproduction control signal and information signal recording apparatus

• US 5,982,977 A
• Filed: 11/22/1996
• Issued: 11/09/1999
• Est. Priority Date: 12/04/1995
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Naruse, Tetsuya, Komatsubara, Michimasa, Iwasaki, Jun, Masaki, Teruo, Mori, Kaname
• Primary Examiner(s): TRAN, THAI Q
• Application Number:
  US08/755,101
• Time in Patent Office: 1,082 Days
• Field of Search: 386/94, 386/52, 386/64, 386/4, 386/95, 360/60, 360/15, 380/3-5, 380/34, 380/46, 380/48, 375/200, 375/201, 375/202, 375/203, 375/204, 375/205, 375/206, 375/207, 375/208, 375/209, 375/210
• US Class Current: 386/252
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00913 based on a spread spectrum technique
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: H04N 2005/91314 the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
• CPC Class Codes: H04N 2005/91321 the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
• CPC Class Codes: H04N 2005/91328 the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
• CPC Class Codes: H04N 2005/9135 by superimposing the spectrally spread copy protection signal onto the video signal
• CPC Class Codes: H04N 2005/91371 the video color burst signal being modified
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection

Abstract

A synthesis signal which was reproduced from reproducing apparatus and converted into an analog signal includes an analog information signal and a copy control code. The copy control code is modulated by a spread spectrum. A code reading unit of the recording apparatus extracts the copy control code by an inverse spread spectrum. A code changing unit changes the copy control code by a spread spectrum as necessary. An output signal of the code changing unit is converted into a digital signal. The digital signal is subjected to processes necessary for recording and is recorded to a recording medium.

Claims

1. An information signal synthesizing apparatus comprising:

an information reading circuit to which a synthesis signal of a main information signal and a sub information signal which was spread spectrum processed to form a spread spectrum processed sub information signal is supplied and which executes an inverse spread spectrum process to said spread spectrum processed sub information signal and reproduces said sub information signal and outputs said main information signal;

a sub information signal control circuit for changing said sub information signal which is supplied from said information reading circuit based on an updated copy status, thereby forming a changed sub information signal;

a spread spectrum circuit for executing a spread spectrum process to said changed sub information signal from said sub information control circuit;

a synthesizer to which said changed sub information signal which was spread spectrum processed and said main information signal from said information reading circuit are supplied and which forms a synthesis signal therefrom;

an analog/digital converter for converting said synthesis signal formed by said synthesizer into a digital signal; and

an encoding circuit for encoding said digital signal.

2. An information signal recording apparatus comprising:

an information reading circuit to which a synthesis signal of a main information signal and a spread spectrum processed copy control signal is supplied and which executes an inverse spread spectrum process to said spread spectrum processed copy control signal, reproduces said copy control signal, and outputs said main information signal;

a copy control signal control circuit for changing said copy control signal supplied from said reading circuit based on an updated copy status, thereby forming a changed copy control signal;

a spread spectrum circuit for executing a spread spectrum process to said changed copy control signal from said copy control signal control circuit;

a synthesizer to which said changed copy control signal which was spread spectrum processed and said main information signal from said information reading circuit are supplied and which forms a synthesis signal therefrom; and

a recorder in which permission and inhibition of recording of said synthesis signal formed by said synthesizer to a recording medium are controlled in accordance with said copy control signal.

3. An information signal synthesizing method comprising the steps of:

executing an inverse spread spectrum process to a spread spectrum processed sub information signal from a synthesis signal of a main information signal and said spread spectrum processed sub information signal, reproducing said sub information signal, and outputting said main information signal;

changing said sub information signal based on an updated copy status and forming a changed sub information signal;

executing a spread spectrum process to said changed sub information signal;

forming a synthesis signal of said changed sub information signal which was spread spectrum processed and said main information signal from said changed sub information signal and said main information signal;

converting said synthesis signal into a digital signal;

encoding said digital signal; and

recording said digital signal.