Patent US4213152A successfully refreshed from Google Patents.
US4213152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Output circuit for video tape recorder
Assignee: Hitachi Ltd
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Filing: 1979-01-25
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Granted: 1980-07-15
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Expires: 1999-01-25
Abstract
Abstract An output circuit for converting a video signal reproduced from a video signal reproducing apparatus such as a video tape recorder, to a signal in the form of an RF signal in terms of a television channel carrier and selectively producing one of two channel carriers, comprises a first filter for eliminating the lower sideband wave of the lower one of the two channels, a second filter connected in series with the first filter for eliminating the lower sideband wave of the higher one of the two channels, and a switch for activating the second filter only when the higher channel is selected to produce the higher channel signal.
Inventors
- 👤 Kazuaki Kakinuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/765; H04N5/775; H04N5/7755
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
An output circuit for a video signal reproducing apparatus which delivers a video signal acceptable to an RF input stage of a television receiver, comprising: means for selectively generating carriers corresponding to two adjacent television channels having successive frequencies; modulating means for modulating an output carrier from said carrier generating means with a video signal; a first filter connected to an output of said modulating means for eliminating the lower sideband wave of the signal of the lower frequency carrier modulated with the video signal; and a second filter connected in series with said first filter in an output path of said modulating means and adapted to be ganged with the selection of the carrier by said carrier generating means for eliminating the lower sideband wave of the signal of the higher frequency carrier when the higher frequency carrier is selected.
Claim 2
Dependent Claim
141 words
An output circuit for a video signal reproducing apparatus which delivers a video signal acceptable to an RF input stage of a television receiver, comprising: means for selectively generating carriers corresponding to two adjacent television channels having successive frequencies; modulating means for modulating an output carrier from said carrier generating means with a video signal; a first filter connected to an output of said modulating means for eliminating the lower sideband wave of the signal of the lower frequency carrier modulated with the video signal; and a second filter connected in series with said first filter in an output path of said modulating means and adapted to be ganged with the selection of the carrier by said carrier generating means for eliminating the lower sideband wave of the signal of the higher frequency carrier when the higher frequency carrier is selected.
Claim 3
Dependent Claim
39 words
An output circuit for a video signal reproducing apparatus according to claim 1, wherein said first filter comprises a band-elimination filter for eliminating only the lower sideband wave of the lower one of the two channel RF signals generated.
Claim 4
Dependent Claim
68 words
An output circuit for a video signal reproducing apparatus according to claim 1, wherein said second filter comprises a band-elimination filter including an impedance element connected between a signal input/output path and the ground for selectively eliminating only the lower sideband wave of the higher one of the two channel RF signals, and a switch for on-off control of the connection between said impedance element and the ground.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |