Patent US3988775A successfully refreshed from Google Patents.
US3988775A
Expired / Lapsed
US
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Ghost signal suppressing device for television receiver set
Assignee: Hitachi Ltd
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Filing: 1975-09-15
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Granted: 1976-10-26
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Expires: 1995-09-15
Abstract
Abstract A ghost signal suppressing device comprises a circuit for suppressing the luminance signal of a ghost signal and a circuit for suppressing the color signal of the ghost signal. A delayed signal used for suppressing the ghost signal is produced at a single delay circuit and branched off to be used for both the suppressing circuits. The branched signals of the same delay time are individually adjusted in their amplitude and then subtracted from an original signal at the respective suppressing circuits.
Inventors
- 👤 Isao Nakagawa
- 👤 Akira Shibata
- 👤 Toshio Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:33
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H04N5/211
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A device for suppressing a ghost signal contained in a television signal comprising: delay means for providing a variable time delay for delaying an input signal; a first means for controlling the amplitude of a signal delayed by said delay means and subtracting the delayed signal from the input signal; a second means for controlling the amplitude of said delayed signal and subtracting said delayed signal from said input signal; means for deriving a luminance signal out of an output terminal of said first means; and means for deriving a color signal out of an output terminal of said second means.
Claim 2
Independent Claim
101 words
A device for suppressing a ghost signal contained in a television signal comprising: delay means for providing a variable time delay for delaying an input signal; a first means for controlling the amplitude of a signal delayed by said delay means and subtracting the delayed signal from the input signal; a second means for controlling the amplitude of said delayed signal and subtracting said delayed signal from said input signal; means for deriving a luminance signal out of an output terminal of said first means; and means for deriving a color signal out of an output terminal of said second means.
Claim 3
Independent Claim
192 words
A device for suppressing a ghost signal contained in a television signal comprising: delay means for delaying an input signal by a time interval corresponding to a time delay of a color signal of the ghost signal in the television signal with respect to an original signal and delivering a delayed signal; means for supplying the television signal to said delay means; a first means for controlling the polarity and amplitude of the delayed signal produced by said delay means; a first adder means for adding an output of said first means to the television signal and delivering a television signal in which the low band component of the luminance signal of the ghost signal is suppressed; a second means for controlling the polarity and amplitude of the delayed signal produced by said delay means; a second adder means for adding an output of said second means to the television signal and delivering a television signal in which the color signal of the ghost signal is suppressed; means for deriving a luminance signal out of said first adder means; and means for deriving a color signal out of said second adder means.
Claim 4
Independent Claim
192 words
A device for suppressing a ghost signal contained in a television signal comprising: delay means for delaying an input signal by a time interval corresponding to a time delay of a color signal of the ghost signal in the television signal with respect to an original signal and delivering a delayed signal; means for supplying the television signal to said delay means; a first means for controlling the polarity and amplitude of the delayed signal produced by said delay means; a first adder means for adding an output of said first means to the television signal and delivering a television signal in which the low band component of the luminance signal of the ghost signal is suppressed; a second means for controlling the polarity and amplitude of the delayed signal produced by said delay means; a second adder means for adding an output of said second means to the television signal and delivering a television signal in which the color signal of the ghost signal is suppressed; means for deriving a luminance signal out of said first adder means; and means for deriving a color signal out of said second adder means.
Claim 5
Independent Claim
196 words
A device for suppressing a ghost signal contained in a television signal comprising: delay means for delaying an input signal by a time interval corresponding to a time delay of a ghost signal in the television signal with respect to an original signal and delivering a delayed signal; means for supplying the television signal to said delay means; a first means for controlling the polarity and amplitude of the delayed signal produced by said delay means; a first adder means for adding an output of said first means to the television signal and delivering a television signal in which the low band component of the luminance signal of the ghost signal is suppressed; a second means for controlling the polarity and amplitude of the delayed signal produced by said delay means and shifting the phase of the delayed signal; a second adder means for adding an output of said second means to the television signal and delivering a television signal in which the color signal of the ghost signal is suppressed; means for deriving a luminance signal out of said first adder means; and means for deriving a color signal out of said second adder means.
Claim 6
Independent Claim
196 words
A device for suppressing a ghost signal contained in a television signal comprising: delay means for delaying an input signal by a time interval corresponding to a time delay of a ghost signal in the television signal with respect to an original signal and delivering a delayed signal; means for supplying the television signal to said delay means; a first means for controlling the polarity and amplitude of the delayed signal produced by said delay means; a first adder means for adding an output of said first means to the television signal and delivering a television signal in which the low band component of the luminance signal of the ghost signal is suppressed; a second means for controlling the polarity and amplitude of the delayed signal produced by said delay means and shifting the phase of the delayed signal; a second adder means for adding an output of said second means to the television signal and delivering a television signal in which the color signal of the ghost signal is suppressed; means for deriving a luminance signal out of said first adder means; and means for deriving a color signal out of said second adder means.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |