US4587580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video signal reproducing apparatus
Assignee: Canon Inc
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Filing: 1984-01-10
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Granted: 1986-05-06
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Expires: 2004-01-10
Abstract
Abstract The disclosed video signal reproducing apparatus reproduces a video signal from a recording medium having adjacent tracks which carry recordings of video signals and recordings of pilot signals with different frequencies superposed on the video signal. A reproducing head traces each of the tracks for reproducing a video signal. A signal processing arrangement obtains a tracking control signal in accordance with the pilot signals obtained from the reproducing head. A compensator compensates for the effect of the tracking control signal on the basis of the frequency characteristic of the reproducing head in the frequency band of the pilot signals.
Inventors
- 👤 Nobutoshi Takayama
- 👤 Hiroo Edakubo
- 👤 Hiroyuki Takimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:02
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/467; G11B15/4673; G11B15/4675; G11B15/4676; G11B15/4677; G11B15/4678; G11B21/00; G11B21/02; G11B21/10; G11B21/103; G11B5/00; G11B5/48; G11B5/58; G11B5/584; G11B5/588; G11B5/592; G11B5/5921; G11B5/5922
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
104 words
A video signal reproducing apparatus for reproducing a video signal from a recording medium having adjacent tracks with recordings of video signals and recordings of pilot signals of different frequencies superposed on the video signal, comprising: a reproducing head for tracing each of the tracks for reproducing a video signal, said head having a given frequency characteristic; signal processing means for obtaining a tracking control signal in accordance with pilot signals obtained from said reproducing head; and means for compensating for the influence on the tracking control signal of the frequency characteristic of said reproducing head in the frequency band of the pilot signals.
Claim 2
Dependent Claim
104 words
A video signal reproducing apparatus for reproducing a video signal from a recording medium having adjacent tracks with recordings of video signals and recordings of pilot signals of different frequencies superposed on the video signal, comprising: a reproducing head for tracing each of the tracks for reproducing a video signal, said head having a given frequency characteristic; signal processing means for obtaining a tracking control signal in accordance with pilot signals obtained from said reproducing head; and means for compensating for the influence on the tracking control signal of the frequency characteristic of said reproducing head in the frequency band of the pilot signals.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1, wherein said compensating means is arranged to deliver the pilot signals obtained from said reproducing head to said signal processing means.
Claim 4
Dependent Claim
13 words
An apparatus according to claim 2, wherein said compensating means includes an equalizer.
Claim 5
Dependent Claim
27 words
An apparatus according to claim 2, further comprising: automatic gain control means for keeping constant a peak value of the pilot signals obtained from said reproducing head.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 4, wherein said gain control means is arranged to deliver the pilot signals obtained via said compensating means to said signal processing means.
Claim 7
Dependent Claim
18 words
An apparatus according to claim 1, wherein said compensating means is arranged to control said signal processing means.
Claim 8
Dependent Claim
50 words
An apparatus according to claim 6, wherein said signal processing means includes a plurality of detectors for obtaining outputs each corresponding to levels of pilot signals obtained from both tracks adjacent to a main track traced by said reproducing head and a comparator for comparing the outputs of the detectors.
Claim 9
Dependent Claim
16 words
An apparatus according to claim 7, wherein said compensating means is arranged to control said comparator.
Claim 10
Dependent Claim
28 words
An apparatus according to claim 8, wherein said compensating means includes a circuit for adjusting one of the outputs of said detectors to be delivered to said comparator.
Claim 11
Dependent Claim
29 words
An apparatus a-cording to claim 6, wherein said compensating means is arranged to carry out the control in synchronism with the change-over of reproduction tracks by said reproducing head.
Claim 12
Dependent Claim
26 words
An apparatus according to claim 1, wherein said recording medium is a magnetic tape and said reproducing head is arranged to trace the magnetic tape obliquely.
Claim 13
Dependent Claim
26 words
An apparatus according to claim 11, further comprising: tracking control means for controlling the running of the magnetic tape in accordance with the tracking control signal.
Claim 14
Dependent Claim
86 words
An information signal reproducing apparatus for reproducing information signals from recording tracks formed on a recording medium, each of said recording tracks having one of a plurality kinds of pilot signals of different frequencies, comprising: (a) reproducing means including a reproducing head for tracing the tracks for reproducing information signals; (b) frequency equalizing means for the pilot signals reproduced by said reproducing means; and (c) signal processing means for obtaining a tracking control signal in accordance with pilot signals frequency equalized by said frequency equalizing means.
Claim 15
Dependent Claim
86 words
An information signal reproducing apparatus for reproducing information signals from recording tracks formed on a recording medium, each of said recording tracks having one of a plurality kinds of pilot signals of different frequencies, comprising: (a) reproducing means including a reproducing head for tracing the tracks for reproducing information signals; (b) frequency equalizing means for the pilot signals reproduced by said reproducing means; and (c) signal processing means for obtaining a tracking control signal in accordance with pilot signals frequency equalized by said frequency equalizing means.
Claim 16
Dependent Claim
32 words
An apparatus according to claim 13, wherein said signal processing means includes a gain control circuit operative to maintain a constant peak level of the output signal of said frequency equalizing means.
Claim 17
Dependent Claim
36 words
An apparatus according to claim 14, wherein said signal processing means forms said tracking control signals using pilot signals other than the pilot signal whose peak level is maintained constant by said automatic gain control signal.
Claim 18
Dependent Claim
104 words
An information signal reproducing apparatus for reproducing information signals from recording tracks formed on a recording medium, on each of which tracks pilot signals having "n" different kinds of frequency are cyclically recorded together with an information signal, comprising: (a) reproducing means including a reproducing head for tracing the tracks for reproducing information signals and for obtaining pilot signals; (b) signal processing means for obtaining a tracking control signal in accordance with pilot signals obtained from said reproducing means; and (c) control means for changing processing characteristics of said signal processing means for each cyclic period in which said reproducing means reproduces "n" tracks.
Claim 19
Dependent Claim
104 words
An information signal reproducing apparatus for reproducing information signals from recording tracks formed on a recording medium, on each of which tracks pilot signals having "n" different kinds of frequency are cyclically recorded together with an information signal, comprising: (a) reproducing means including a reproducing head for tracing the tracks for reproducing information signals and for obtaining pilot signals; (b) signal processing means for obtaining a tracking control signal in accordance with pilot signals obtained from said reproducing means; and (c) control means for changing processing characteristics of said signal processing means for each cyclic period in which said reproducing means reproduces "n" tracks.
Claim 20
Dependent Claim
49 words
An apparatus according to claim 16, wherein said signal processing means includes a plurality of detectors for obtaining outputs each corresponding to levels of pilot signals obtained from tracks adjacent to a track being traced by said reproducing head and a comparator for comparing the outputs of the detectors.
Claim 21
Dependent Claim
34 words
An apparatus according to claim 17, wherein said control means includes a circuit for selecting D.C. values to be added to one of the outputs of the detectors to be delivered to said comparator.
Claim 22
Dependent Claim
20 words
An apparatus according to claim 18, wherein said selecting circuit is arranged to select one of two values of D.C.
Claim 23
Dependent Claim
29 words
An apparatus according to claim 19, wherein said selecting circuit is arranged to perform a selecting operation corresponding to the kind of pilot signals obtained from a reproduction track.
Claim 24
Dependent Claim
30 words
An apparatus according to claim 20, wherein said selecting circuit is arranged to switch over the D.C. value to be selected every time when said reproducing head traces two tracks.
Claim 25
Dependent Claim
26 words
An apparatus according to claim 18, wherein said selecting circuit is arranged to select one kind of D.C. value out of "n" kinds of D.C. values.
Claim 26
Dependent Claim
31 words
An apparatus according to claim 22, wherein said selecting operation of said selecting means correspond to the kind of pilot signals obtained from a track being traced by said reproducing head.
Claim 27
Dependent Claim
114 words
An information signal reproducing apparatus for reproducing information signals from a recording medium with adjacent tracks having recordings of video signals and recordings of pilot signals with different frequencies superposed on the information signals, comprising: (a) a reproducing head for tracing the tracks for reproducing information signals and for reproducing pilot signals; (b) signal processing means for obtaining a tracking control signal in accordance with pilot signals obtained from said reproducing head; (c) adding means for adding D.C. values to the tracking control signal obtained from said signal processing means; and (d) change-over means for changing over the level of said D.C. values in synchronism with the change-over of tracks by said reproducing head.
Claim 28
Dependent Claim
114 words
An information signal reproducing apparatus for reproducing information signals from a recording medium with adjacent tracks having recordings of video signals and recordings of pilot signals with different frequencies superposed on the information signals, comprising: (a) a reproducing head for tracing the tracks for reproducing information signals and for reproducing pilot signals; (b) signal processing means for obtaining a tracking control signal in accordance with pilot signals obtained from said reproducing head; (c) adding means for adding D.C. values to the tracking control signal obtained from said signal processing means; and (d) change-over means for changing over the level of said D.C. values in synchronism with the change-over of tracks by said reproducing head.
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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |