Patent US2890878A successfully refreshed from Google Patents.
US3745241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television receiver for separating and reproducing multiplexed video signals
Assignee: Panasonic Holdings Corp
•
Filing: 1971-03-30
•
Granted: 1973-07-10
•
Expires: 1991-03-30
Abstract
Abstract A television receiver in which a television signal containing two different kinds of video signals for every other scanning period is received, and the two different kinds of video signals are picked up separately from the received signal and displayed as different images on two different picture tubes.
Inventors
- 👤 M Hirashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:13
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/0806
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
240 words
A television receiver for receiving a video carrier on which first and second video signals are carried during respective alternate horizontal scanning periods for display as different images on corresponding first and second display devices, wherein the improvement comprises switching circuit means for receiving said video carrier; first and second video circuit means each having first and second inputs and an output, the output of said switching circuit means being coupled to the first inputs of said first and second video circuit means and the outputs of said first and second video circuit means being coupled to said first and second display devices respectively, and first and second delay means coupled between the output of said switching circuit means and the second inputs of said first and second video circuit means respectively, said switching circuit means coupling said first and second video signals to said first video circuit means and said first delay means and to said second video circuit means and said second delay means respectively during alternate horizontal scanning periods, said first delay means delaying said first video signal and coupling iT to said first video circuit during the horizontal scanning period succeeding the horizontal scanning period when said first video signal was received and said second delay means delaying said second video signal and coupling it to said second video circuit during the horizontal scanning period succeeding the horizontal scanning period when said video signal was received.
Claim 2
Dependent Claim
240 words
A television receiver for receiving a video carrier on which first and second video signals are carried during respective alternate horizontal scanning periods for display as different images on corresponding first and second display devices, wherein the improvement comprises switching circuit means for receiving said video carrier; first and second video circuit means each having first and second inputs and an output, the output of said switching circuit means being coupled to the first inputs of said first and second video circuit means and the outputs of said first and second video circuit means being coupled to said first and second display devices respectively, and first and second delay means coupled between the output of said switching circuit means and the second inputs of said first and second video circuit means respectively, said switching circuit means coupling said first and second video signals to said first video circuit means and said first delay means and to said second video circuit means and said second delay means respectively during alternate horizontal scanning periods, said first delay means delaying said first video signal and coupling iT to said first video circuit during the horizontal scanning period succeeding the horizontal scanning period when said first video signal was received and said second delay means delaying said second video signal and coupling it to said second video circuit during the horizontal scanning period succeeding the horizontal scanning period when said video signal was received.
Claim 3
Dependent Claim
50 words
A television receiver as defined by claim 1 wherein said first and second delay means each comprises a plurality of delay lines having different delay characteristics with respect to frequency, said first and second delay means delaying said first and second video signals over the substantially entire frequency range thereof.
Claim 4
Dependent Claim
174 words
A television receiver as defined by claim 1 wherein said video carrier further carries vertical and horizontal synchronizing signals and wherein said switching circuit means comprises a bistable multivibrator having first and second output states, first and second switching elements coupling the output of said bistable multivibrator to the first inputs of said first and second video circuit means and to said first and second delay means respectively during successive horizontal scanning periods, switching means having a first input for coupling said vertical synchronizing signals to the input of said bistable multivibrator, and a mono stable multivibrator receiving said vertical synchronizing signals, the output of said monostable multivibrator being coupled to a second input of said switching means for preventing synchronizing pulses from being applied to said bistable multivibrator for a predetermined portion of the vertical blanking period thereby maintaining the output of said bistable multivibrator in a first state during that portion of the vertical blanking period and causing said first switching element to conduct and said second switching element to be non-conductive.
Claim 5
Dependent Claim
26 words
A television receiver as defined by claim 3 which further comprises integrating, amplifying and shaping circuit means for coupling said synchronizing signals to said monostable multivibrator.
Claim 6
Dependent Claim
72 words
A television receiver as defined by claim 3 which further comprises means coupling said monostable multivibrator to said bistable multivibrator for deenergizing said bistable multivibrator during a part of said predetermined portion of said vertical blanking period and maintaining the output of said bistable multivibrator in said first state, output pulses being produced by said bistable multivibrator starting from a predetermined horizontal synchronizing signal preceding the end of the vertical blanking period.
Claim 7
Dependent Claim
26 words
A television receiver as defined by claim 5 which further comprises integrating, amplifying and shaping circuit means for coupling said synchronizing signals to said monostable multivibrator.
Claim 8
Dependent Claim
24 words
A television receiver as defined by claim 1 which further comprises an audio signal system for receiving, separating and reproducing separately multiplexed audio signals.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |