US3890639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video tape recording animation system
Assignee: HER MAJESTY IN RIGHT OF CANADA AS REPRESENTED BY NATIONAL FILM BOARD OF CANADA
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Filing: 1973-06-08
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Granted: 1975-06-17
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Expires: 1993-06-08
Abstract
Abstract The invention relates to a system for controlling a video tape recorder in such a way that a selected number of frames can be recorded on a video tape in the recorder from a selected point on the tape. The selected point will usually be the last recorded frame on the tape. An audio signal is applied on the audio frequency portion of the video tape to or from a point adjacent to the last recorded video frame and for some distance on the tape ahead of or behind this point. When the tape is run in its forward direction, the start or cessation of the audio signal causes the onset of video recording. In addition, it actuates a counter which counts the number of video frames recorded. When the selected number of frames have been recorded, the counter provides an output to stop the video recording. The audio signal is applied when the tape is being rewound after the recording activity. It is, of course, necessary that the tape be positioned well behind the point at which video recording will commence to ensure that the tape will be at video recording speed when the end of the last recorded frame is adjacent the video recording head.
Inventors
- 👤 Leopold Henry O'donnell
- 👤 Robert Forget
- 👤 Youssef Hasrouni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:40
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/024; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
A method for controlling a video tape recorder in such a way that a selected number of frames of video information can be recorded, by video recorder means, on a video tape in said video tape recorder from a first position on the video tape on command; said video tape comprising an audio frequency portion and a video frequency portion; said method comprising: positioning said video tape so that a second position on said video tape, predetermined length behind said first position, is adjacent said video recording means; impressing an audio signal on said audio frequency portion of said video tape along the predetermined length of said video tape; moving said video tape in its forward recording direction; detecting the audio signal on the audio portion of said video tape while the tape is moving in its forward direction; turning on the video recording means after the cessation of the audio signal and starting a count of frames elapsed after the turn on of the video recording means; detecting a count corresponding to the selected number of frames; and turning off said video recording means when the count is detected.
Claim 2
Independent Claim
190 words
A method for controlling a video tape recorder in such a way that a selected number of frames of video information can be recorded, by video recorder means, on a video tape in said video tape recorder from a first position on the video tape on command; said video tape comprising an audio frequency portion and a video frequency portion; said method comprising: positioning said video tape so that a second position on said video tape, predetermined length behind said first position, is adjacent said video recording means; impressing an audio signal on said audio frequency portion of said video tape along the predetermined length of said video tape; moving said video tape in its forward recording direction; detecting the audio signal on the audio portion of said video tape while the tape is moving in its forward direction; turning on the video recording means after the cessation of the audio signal and starting a count of frames elapsed after the turn on of the video recording means; detecting a count corresponding to the selected number of frames; and turning off said video recording means when the count is detected.
Claim 3
Independent Claim
216 words
A system for controlling a video tape recorder in such a way that a selected number of frames of video information can be recorded on a video tape in said video tape recorder, from a first position on the video tape, on command; said video tape comprising an audio frequency portion and a video frequency portion; said system comprising: video signal recording means; means for positioning said video tape so that a second position on said video tape, a predetermined length behind said first position, is adjacent said video recording means; means for impressing an audio signal on said audio frequency portion of said video tape along the predetermined length of said video tape; means for moving the video tape in its forward recording direction; means for detecting the audio signal on said audio frequency portion of said video tape while the tape is moving in its forward direction; means actuated by the cessation of the audio signal to turn on the video recording means and to start a count of frames elapsed after the turn on of the video recording means; means for detecting a count corresponding to the selected number of frames; and means, actuated by said means for detecting the count for turning off said video recording means, when the count is detected.
Claim 4
Independent Claim
216 words
A system for controlling a video tape recorder in such a way that a selected number of frames of video information can be recorded on a video tape in said video tape recorder, from a first position on the video tape, on command; said video tape comprising an audio frequency portion and a video frequency portion; said system comprising: video signal recording means; means for positioning said video tape so that a second position on said video tape, a predetermined length behind said first position, is adjacent said video recording means; means for impressing an audio signal on said audio frequency portion of said video tape along the predetermined length of said video tape; means for moving the video tape in its forward recording direction; means for detecting the audio signal on said audio frequency portion of said video tape while the tape is moving in its forward direction; means actuated by the cessation of the audio signal to turn on the video recording means and to start a count of frames elapsed after the turn on of the video recording means; means for detecting a count corresponding to the selected number of frames; and means, actuated by said means for detecting the count for turning off said video recording means, when the count is detected.
Claim 5
Dependent Claim
38 words
A system as defined in claim 2, wherein said means for positioning said video tape comprises means, actuated by the means for detecting the count when the count is detected, for moving the tape in its reverse direction.
Claim 6
Dependent Claim
18 words
A system as defined in claim 2, wherein said video signal recording means is a video record/playback head.
Claim 7
Dependent Claim
36 words
A system as defined in claim 2, wherein said means for positioning said video tape and said means for moving the video tape in its forward direction both together comprise a reversible DC tapE drive motor.
Claim 8
Dependent Claim
75 words
A system as defined in claim 2, wherein the means for impressing an audio signal comprises an audio record/playback head adjacent the audio frequency portion of the video tape, said audio head being turned on when said means for moving the tape in its reverse direction starts moving the tape in its reverse direction, and said audio head being turned off when the second position of said video tape is adjacent said video recording means.
Claim 9
Dependent Claim
42 words
A system as defined in claim 6, wherein said audio record head is connected to an audio oscillator when in its record mode, and to an audio detector, which comprises the means for detecting an audio signal, when in its playback mode.
Claim 10
Dependent Claim
69 words
A system as defined in claim 7, wherein said means for detecting a count comprises a decoded counter having a clock terminal; said system further comprising means for providing vertical sync pulses of said tape recorder to the clock terminal of the counter; and means for pre-setting the counter to a desired count; the output of said audio detector being connected to said counter to actuate its counting mode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |