Signal recording/reproducing method and apparatus, signal record medium and signal

• US 6,363,209 B2
• Filed: 10/14/1998
• Issued: 03/26/2002
• Est. Priority Date: 08/25/1995
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Osawa, Yoshitomo, Sako, Yoichiro, Kurihara, Akira, Masuda, Shozo, Kawashima, Isao
• Primary Examiner(s): NGUYEN, HUY THANH
• Application Number:
  US09/172,962
• Publication Number:
  US 20010003553A1
• Time in Patent Office: 1,259 Days
• Field of Search: 386/95, 386/83, 386/46, 386/111, 386/112, 386/96, 386/94, 386/104, 386/125, 386/126, 348/574, 348/461, 380/203, 360/15
• US Class Current: 386/252
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• 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 20/00115 wherein the record carrier stores a unique medium identifier
• CPC Class Codes: G11B 20/00123 the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
• CPC Class Codes: G11B 20/00181 using a content identifier, e.g. an international standard recording code [ISRC] or a digital object identifier [DOI]
• CPC Class Codes: G11B 20/00688 said measures preventing that a usable copy of recorded data can be made on another medium
• CPC Class Codes: G11B 20/00884 involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
• CPC Class Codes: G11B 20/00891 embedded in audio data
• CPC Class Codes: G11B 2220/2537 Optical discs
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: G11B 7/00736 Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082
• CPC Class Codes: H04N 2005/91335 the copy protection signal being a watermark
• CPC Class Codes: H04N 2005/91342 the copy protection signal being an authentication signal
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/23892 involving embedding information at multiplex stream level, e.g. embedding a watermark at packet level
• CPC Class Codes: H04N 21/8358 involving watermark protecting executable software by watermarking G06F21/16; image watermarking in general G06T1/0021; watermarks inserted in still images for transmission purposes H04N1/32144; inserting watermarks during video coding H04N19/467
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/913 : for scrambling ; for copy protection
• CPC Class Codes: H04N 9/7921 : for more than one processing mode
• CPC Class Codes: H04N 9/8042 : involving data reduction

Abstract

A signal recording/reproducing method and apparatus, signal record medium and signal transmission/reception method and apparatus, whereby a signal recorded on a signal record medium can identified as being an original signal or a copied signal. A CPU 11 generates, at a pe-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit 3 adds the identification signal to the video signals and/or the audio signals. A sector forming circuit 5 and circuit components up to a recording/reproducing head 14 record the video signals and/or the audio signals and the ancillary identification signal on an optical disc 12.

Claims

1. A signal record medium having recorded thereon a video signal and/or an audio signal of which a least significant bit of a plurality of portions of said video signal, and/or said audio signal has been modified to include an identification relevant to said video signal and/or said audio signal within a portion of said video signal and/or said audio signal including, or in the vicinity of, a determined high level portion thereof within a predetermined time interval, and in a configuration so as to reduce the effects of the inclusion of said identification on said video signal and/or said audio signal, and wherein said identification is detected by an apparatus that separates said identification from said video signal and/or said audio signal by sampling all of the least significant bits of all of the video signal and/or audio signal in said predetermined time interval and processing all of said detected least significant bits.

2. The signal record medium as claimed in claim 1 wherein said video signal and/or said audio signal is modified to include said identification in a configuration so that said identification is detected by statistic processing of said video signal and/or said audio signal.

3. The signal record medium as claimed in claim 2 wherein a least significant bit of a portion of said video signal and/or said audio signal is modified to include said identification.

4. The signal record medium as claimed in claim 3 wherein said identification is inserted into said video signal and/or said audio signal having a high signal energy.

5. The signal record medium as claimed in claim 2 wherein said identification is included in said video signal and/or said audio signal at a synchronous timing.

6. The signal record medium as claimed in claim 2 wherein said identification is included in said video signal and/or said audio signal at an asynchronous timing.

7. The signal record medium as claimed in claim 1 wherein a least significant bit of a pre-set sample of said video signal and/or said audio signal having a high signal energy is modified to include said identification.

8. The signal record medium as claimed in claim 7 wherein said identification is inserted into said video signal and/or said audio signal having a high signal energy.

9. The signal record medium as claimed in claim 1 wherein said audio signal and/or said video signal is modified to include said identification signal at a synchronous timing.

10. The signal record medium as claimed in claim 1 wherein said video signal and or said audio signal are compressed signals.

11. The signal record medium as claimed in claim 1 wherein said identification is arrayed at a higher coefficient position of the coefficients obtained on orthogonal transform of said video signal and/or said audio signal.

12. The signal record medium as claimed in claim 1 wherein a dither noise modulated in accordance with the identification is added to said video signal and/or said audio signal and the resulting signals are recorded on the signal recording medium.

13. The signal recording medium of claim 1, wherein said portion of said video signal and/or said audio signal including, or in the vicinity of, said high level portion has been modified by increasing the values of said video signal and/or said audio signal, decreasing the values of said video signal and/or said audio signal, or keeping the values of said video signal and/or said audio signal without change.

14. The signal recording medium of claim 1, wherein said identification has been inserted in a least significant bit of a plurality of portions of said video and/or audio signal at predetermined portions of said video and/or audio signals, said identification defining that said video and/or audio signal is original or copied, a maker identification, a formatter identification, or copying management information.