Record carrier with variations of different physical parameters thereof in different frequency bands during recording

• US 6,363,041 B1
• Filed: 11/02/2000
• Issued: 03/26/2002
• Est. Priority Date: 12/02/1991
• Status: Expired due to Term

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Timmermans, Jozef M. K., Schylander, Erik C., Mons, Johannes J.
• Primary Examiner(s): Young, W. R.
• Application Number:
  US09/704,831
• Time in Patent Office: 509 Days
• Field of Search: 369/44.13, 369/44.26, 369/44.39, 369/100, 369/111, 369/275--27, 369/47.12, 369/47.13, 369/53.21, 369/59.25, 369/109-1-1, 369/124.07, 369/47.15, 360/133
• US Class Current: 369/47.15
• CPC Class Codes: G11B 13/00 Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for G11B9/14, G11B11/002 take precedence; driving or moving of heads G11B3/02, G11B5/48, G11B7/08, G11B21/02
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• 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 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00405 the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track
• CPC Class Codes: G11B 20/00586 said format change concerning the physical format of the recording medium
• CPC Class Codes: G11B 20/00594 wherein the shape of recording marks is altered, e.g. the depth, width, or length of pits
• CPC Class Codes: G11B 20/00601 wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity
• CPC Class Codes: G11B 20/1809 by interleaving
• CPC Class Codes: G11B 23/281 by changing the physical properties of the record carrier
• CPC Class Codes: G11B 23/284 on the record carrier
• CPC Class Codes: G11B 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
• CPC Class Codes: G11B 5/74 Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• 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: G11B 7/0901 for track following only G11B7/0925, G11B7/094, G11B7/0941, G11B7/0943, G11B7/0945, G11B7/0946, G11B7/0948 take precedence
• CPC Class Codes: G11B 7/0938 servo format, e.g. guide tracks, pilot signals
• CPC Class Codes: G11B 7/24085 Pits
• CPC Class Codes: G11B 9/00 : Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor G11B11/00 takes precedence driving or moving of heads G11B21/02
• 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 5/913 : for scrambling ; for copy protection

Abstract

A record carrier on which information is recorded in the form of first variations caused by the presence or absence of information marks along a recording track, such variations representing an information signal. The record carrier also exhibits second variations in the form of changes in the position of the information marks in a direction transversed to the track direction. The second variations having a frequency spectrum substantially entirely outside the frequency spectrum of the first variations. The second variations are detectable by the same playback transducer which detects the first variations, and the presence of the second variations may be necessary to enable the transducer to detect the first variations.

Claims

1. A record carrier on which information is recorded in the form of information marks along a track thereon, said record carrier exhibiting:

first variations in the form of existence and non-existence of the information marks along the track, said first variations representing an information signal recorded on the record carrier; and

second variations in the form of variations of the position of the information marks in a direction transverse to the track direction, the second variations having a frequency spectrum which is substantially entirely outside the frequency spectrum of the first variations;

the presence of these second variations being detectable by playback transducer means during scanning of said track,

wherein the information signal recorded on the record carrier is of a type which is recoverable by a predetermined type of data processing, and

the second variations represent a code which indicates said predetermined type of data processing for recovery of the recorded information.

2. A record carrier on which information is recorded in the form of information marks along a track thereon, said record carrier exhibiting:

first variations in the form of existence and non-existence of the information marks along the track, said first variations representing an information signal recorded on the record carrier; and

second variations in the form of variations of the position of the information marks in a direction transverse to the track direction, the second variations being free from position identifying information, and exhibiting a modulation pattern having a frequency spectrum which is substantially entirely outside the frequency spectrum of the first variations, and the second variations containing information related to control of information processing of the information signals in a playback apparatus;

the presence of these second variations being detectable by playback transducer means of said playback apparatus during scanning of said track.

3. A record carrier as claimed in claim 2, wherein the second variations have a variation pattern representing a code for controlling recovery of the recorded information.

4. A record carrier as claimed in claim 2, of an optically readable type in which the existence and non-existence of the information marks along a track correspond to a pattern of optically detectable information marks alternating with intermediate areas along the track.