EP0348218A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dual deck video recording apparatus and method
Assignee: Adeia Media LLC
•
Filing: 1989-06-23
•
Granted: —
•
Expires: 2009-06-23
Abstract
Abstract A method and apparatus are described for preventing a dual deck video recorder from being used to record a copy-protected video signal. A switch (43) is included on the recorder to indicate whether a video signal input to one of the deck locations for recording originates externally of the machine or internally at another deck location. Recording is prevented whenever the switch indicates that the video signal originates from the other deck location if the video signal at such location includes a selected copy-protect signal. If a video signal to be recorded comes from externally of the machine, copying of the same is prevented if (1) the video signal includes the copy-protect signal; or (2) the video signal to be copied is the same as the play back video signal and the latter has the selected copy-protect signal.
Inventors
- 👤 John O. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 16:59
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B20/00; G11B20/00086; G11B20/00681; G11B20/00688; G11B20/00702; G11B27/00; G11B27/02; G11B27/022; G11B27/028; G11B5/00; G11B5/86; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G11B2220/00; G11B2220/40; G11B2220/45; G11B2220/455; G11B2220/90; G11B2220/91; G11B27/024; H04N2005/91307; H04N2005/91314
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
123 words
Apparatus having more than one operative location for magnetic storage media comprises recording means (27) at a first operative location for magnetically recording a video signal on magnetic storage medium at said location; input means (36) for directing an externally supplied video signal to said recording means (27) for recording; playback means (26) at a second operative location for outputting a video signal from magnetic storage medium at said second location; detection means (48) for determining if a preselected signal portion is on magnetic storage medium at said second location; and signal generating means (57) responsive to said detection means determining the presence of said preselected signal portion by generating a prohibit signal which prevents said recording means from copying said video signal.
Claim 2
Dependent Claim
123 words
Apparatus having more than one operative location for magnetic storage media comprises recording means (27) at a first operative location for magnetically recording a video signal on magnetic storage medium at said location; input means (36) for directing an externally supplied video signal to said recording means (27) for recording; playback means (26) at a second operative location for outputting a video signal from magnetic storage medium at said second location; detection means (48) for determining if a preselected signal portion is on magnetic storage medium at said second location; and signal generating means (57) responsive to said detection means determining the presence of said preselected signal portion by generating a prohibit signal which prevents said recording means from copying said video signal.
Claim 3
Dependent Claim
55 words
Apparatus as claimed in Claim 1, wherein said detection means (48) is arranged to determine if said preselected signal portion is defined by data on said second magnetic storage medium at said second location by detecting the presence, or non-presence, of said preselected signal portion on the video signal outputted by said playback means (26).
Claim 4
Dependent Claim
41 words
Apparatus as claimed in Claim 1 or 2, further comprising switch means (43) for connecting alternatively to said recording means (27) said input means (36) for an externally supplied video signal or said video signal output from said playback means (26).
Claim 5
Dependent Claim
35 words
Apparatus as claimed in Claim 3, further comprising means for indicating whether said recording means (27) is connected to said external input means (36) or to the output video signal of said playback means (26).
Claim 6
Dependent Claim
46 words
Apparatus as claimed in any preceding claim, further comprising video correlator means (51) for determining if the program defined by a video signal output from said playback means (26) is the same as the program defined by a video signal input to said recording means (27).
Claim 7
Dependent Claim
28 words
Apparatus as claimed in Claim 5, wherein said video correlator means (51) comprises means (94, 96) for clamping portions of said video signals to the same voltage level.
Claim 8
Dependent Claim
35 words
Apparatus as claimed in Claim 5 or Claim 6, wherein said video correlator means (51) comprises means (99) for determining if the difference between the voltages of said video signals is outside a predetermined range.
Claim 9
Dependent Claim
55 words
Apparatus as claimed in any preceding claim, wherein said preselected signal portion includes a signal segment which has a voltage level at a location at which it is normally not required by said video signal to produce a desired display, and said detection means (51) detects the presence of said voltage level at said location.
Claim 10
Dependent Claim
24 words
Apparatus as claimed in Claim 8, wherein said location having said preselected signal segment occurs during the vertical blanking interval of said video signal.
Claim 11
Dependent Claim
29 words
Apparatus as claimed in Claim 8 or 9, wherein said detection means (48) comprises a voltage peak detector for detecting the presence of said voltage level at said location.
Claim 12
Independent Claim
142 words
A method for preventing a video signal having a preselected signal portion from being copied from one magnetic medium to another by a machine having more than one operative location for magnetic media, comprising the steps of providing a recording means at a first location for magnetically recording a video signal on magnetic storage medium at said location; providing input means for directing an externally supplied video signal to said recording means for recording; providing a playback means at a second location for outputting a video signal from magnetic storage medium at said second location; determining if said preselected signal portion is present on magnetic storage medium at said second location; and generating when it is determined that said preselected signal portion is present on said magnetic storage medium, a prohibit signal which prevents said recording means from copying said video signal.
Claim 13
Independent Claim
142 words
A method for preventing a video signal having a preselected signal portion from being copied from one magnetic medium to another by a machine having more than one operative location for magnetic media, comprising the steps of providing a recording means at a first location for magnetically recording a video signal on magnetic storage medium at said location; providing input means for directing an externally supplied video signal to said recording means for recording; providing a playback means at a second location for outputting a video signal from magnetic storage medium at said second location; determining if said preselected signal portion is present on magnetic storage medium at said second location; and generating when it is determined that said preselected signal portion is present on said magnetic storage medium, a prohibit signal which prevents said recording means from copying said video signal.
Claim 14
Dependent Claim
36 words
A method as claimed in Claim 11 further comprising the step of connecting alternatively to said recording means, said input means for an externally supplied video signal and a video signal output from said playback means.
Claim 15
Dependent Claim
43 words
A method as claimed in Claim 11 or 12, further comprising the step of determining if the program defined by video signal output from said playback means is the same as the program defined by the video signal input to said recording means.
Claim 16
Independent Claim
60 words
A method as claimed in any of Claims 11 to 13, wherein said preselected signal portion includes a signal segment which has a voltage level at a location at which it is normally not required by said video signal to produce a desired display, and further comprising the step of detecting the presence of said voltage level at said location.
Claim 17
Dependent Claim
24 words
A method as claimed in Claim 14, wherein said location having said preselected signal occurs during the vertical blanking interval of said video signal.
Claim 18
Independent Claim
32 words
A method as claimed in any of Claims 11 to 15, comprising the step of preventing recording by said recording means of an externally applied video signal having said preselected signal portion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.